Compaq 6720t HP Compaq 6720t Mobile Thin Cleint PC - Maintenance and Service G
Compaq 6720t - Mobile Thin Client Manual
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- Compaq 6720t | HP Compaq 6720t Mobile Thin Cleint PC - Maintenance and Service G - Page 1
HP Compaq 6720t Mobile Thin Client Maintenance and Service Guide - Compaq 6720t | HP Compaq 6720t Mobile Thin Cleint PC - Maintenance and Service G - Page 2
countries. Microsoft, Windows, and Windows Vista are either trademarks or registered trademarks of Microsoft Corporation in the United States and/or other countries. The information contained herein is subject to change without notice. The only warranties for HP products and services are set forth - Compaq 6720t | HP Compaq 6720t Mobile Thin Cleint PC - Maintenance and Service G - Page 3
surface. Do not allow another hard surface, such as an adjoining optional printer, or a soft surface, such as pillows or rugs or clothing, to block airflow. Also, do not allow the AC adapter to contact the skin or a soft surface, such as pillows or rugs or clothing, during operation. The computer - Compaq 6720t | HP Compaq 6720t Mobile Thin Cleint PC - Maintenance and Service G - Page 4
iv Safety warning notice - Compaq 6720t | HP Compaq 6720t Mobile Thin Cleint PC - Maintenance and Service G - Page 5
12 Plastics Kit ...16 Miscellaneous parts ...17 Sequential part number listing 18 4 Removal and replacement procedures Preliminary replacement requirements 21 Tools required ...21 Service considerations 21 Plastic parts 21 Cables and connectors 22 Drive handling 22 Grounding guidelines 23 - Compaq 6720t | HP Compaq 6720t Mobile Thin Cleint PC - Maintenance and Service G - Page 6
Component replacement procedures 27 Serial number ...27 Computer feet ...28 Battery ...29 Flash drive ...30 Memory module ...31 Optical drive ...33 Keyboard ...35 , WXGA display specifications 65 8X Max DVD-ROM Drive specifications 66 System DMA specifications ...67 System interrupt specifications - Compaq 6720t | HP Compaq 6720t Mobile Thin Cleint PC - Maintenance and Service G - Page 7
...87 Torx T8M2.5×6.0 screw ...88 Hex HM5.0×11.0 screw lock 89 8 Connector pin assignments Audio-out (headphone) ...90 Audio-in (microphone) ...90 External RJ-45 (network) ...93 Universal Serial Bus ...93 9 Power cord set requirements Requirements for all countries and regions 94 Requirements for - Compaq 6720t | HP Compaq 6720t Mobile Thin Cleint PC - Maintenance and Service G - Page 8
viii - Compaq 6720t | HP Compaq 6720t Mobile Thin Cleint PC - Maintenance and Service G - Page 9
1 Product description Category Product Name Processors Chipset Graphics Panel Memory Flash drive Optical drives Diskette drive Audio Modem Ethernet Wireless External media card Ports Description HP Compaq 6720t Mobile Thin Client Intel® Celeron® M423 1.06-GHz processor 1-MB L2 cache, 533-MHz front - Compaq 6720t | HP Compaq 6720t Mobile Thin Cleint PC - Maintenance and Service G - Page 10
, supports 3-pin DC connector) 6-cell, 47-Wh Li-ion battery Support for optional 12- or 8-cell accessory battery Security Supports Kensington security lock Operating system Preinstalled: Microsoft® Windows® XPe Serviceability End-user replaceable parts: AC adapter Battery (system) Memory - Compaq 6720t | HP Compaq 6720t Mobile Thin Cleint PC - Maintenance and Service G - Page 11
2 External component identification Top components Display Item (1) Component Wireless antennae (2) (2) Display release latch Function Send and receive signals from one or more wireless devices. These antennae are not visible from the outside of the computer. Opens the computer. Top components - Compaq 6720t | HP Compaq 6720t Mobile Thin Cleint PC - Maintenance and Service G - Page 12
in the computer are fully charged. If the computer is not plugged into an external power source, the light stays off until the battery reaches a low battery level. Blinking: The flash drive or optional optical drive is being accessed. On: Caps lock is on. On: Numeric lock is on. On: Computer - Compaq 6720t | HP Compaq 6720t Mobile Thin Cleint PC - Maintenance and Service G - Page 13
to turn on the computer. ● When the computer is in Standby, press the button briefly to exit Standby. If the computer has stopped responding and Windows® shutdown procedures are ineffective, press and hold the power button for at least 5 seconds to turn off the computer. To learn more about your - Compaq 6720t | HP Compaq 6720t Mobile Thin Cleint PC - Maintenance and Service G - Page 14
combination with the fn key. Executes frequently used system functions when pressed in combination with a function key or the esc key. Displays the Windows Start menu. Displays a shortcut menu for items beneath the pointer. Can be used like the keys on an external numeric keypad. Execute frequently - Compaq 6720t | HP Compaq 6720t Mobile Thin Cleint PC - Maintenance and Service G - Page 15
TouchPad Item Component Function (1) TouchPad* Moves the pointer and selects or activates items on the screen. (2) Left TouchPad button* Functions like the left button on an external mouse. (3) Right TouchPad button* Functions like the right button on an external mouse. (4) TouchPad - Compaq 6720t | HP Compaq 6720t Mobile Thin Cleint PC - Maintenance and Service G - Page 16
the computer are fully charged. If the computer is not plugged into an external power source, the light stays off until the battery reaches a low battery level. Blinking: The flash drive or optional optical drive is being accessed. Opens the computer. 8 Chapter 2 External component identification - Compaq 6720t | HP Compaq 6720t Mobile Thin Cleint PC - Maintenance and Service G - Page 17
ports (2) (4) Optical drive (select models only) Left-side components Function Produces sound when connected to optional powered stereo speakers, headphones, cool internal components. Connects an optional USB device. Supports optional Type I and Type II 32-bit (CardBus) or 16bit PC Cards - Compaq 6720t | HP Compaq 6720t Mobile Thin Cleint PC - Maintenance and Service G - Page 18
an AC adapter. Connects an external VGA monitor or projector. Item Component (1) Battery bay (2) Battery release latches (2) (3) Accessory battery connector (4) Business card holder (5) Memory module compartment (6) Flash drive bay (7) Vent (8) Docking connector Function Holds - Compaq 6720t | HP Compaq 6720t Mobile Thin Cleint PC - Maintenance and Service G - Page 19
3 Illustrated parts catalog Serial number location When ordering parts or requesting information, provide the computer serial number and model number located on the bottom of the computer. Serial number location 11 - Compaq 6720t | HP Compaq 6720t Mobile Thin Cleint PC - Maintenance and Service G - Page 20
Computer major components Item (1) Description 15.4-inch, WXGA, antiglare display assembly (includes display panel cable and 2 wireless antenna transceivers and cables) Display internal components: Display bezel Spare part number 467783-001 466164-001 12 Chapter 3 Illustrated parts catalog - Compaq 6720t | HP Compaq 6720t Mobile Thin Cleint PC - Maintenance and Service G - Page 21
inverter (2) Switch cover (includes LED board and cable) (3) Keyboards For use in Belgium For use in the Czech Republic For the United States (4) Heat sink (includes replacement thermal material) (5) Broadcom 802.11a/b/g WLAN modules: Spare part number 466166-001 466167-001 417520-001 - Compaq 6720t | HP Compaq 6720t Mobile Thin Cleint PC - Maintenance and Service G - Page 22
spare part information): 417527-001 PC Card slot bezel Memory module compartment cover (includes one captive screw, secured by a C-clip) Flash drive bay cover (includes 2 captive screws, secured by C-clips) Flash drive bracket (included with flash drive) 1-GB flash drive (includes flash drive - Compaq 6720t | HP Compaq 6720t Mobile Thin Cleint PC - Maintenance and Service G - Page 23
Item Description (16) (17) (18) 1024-MB, PC2-5300, 667-MHz, DDR2 memory module 6-cell, 47-Wh Li-ion battery 8X Max DVD-ROM Drive (includes bezel and bracket) Spare part number 414046-001 467784-001 467782-001 Computer major components 15 - Compaq 6720t | HP Compaq 6720t Mobile Thin Cleint PC - Maintenance and Service G - Page 24
Plastics Kit Item Description Plastics Kit: (1) Flash drive bay cover (includes 2 captive screws, secured by C-clips) (2) PC Card slot bezel (3) Memory module compartment cover (includes one captive screw, secured by a C-clip) Spare part number 417527-001 16 Chapter 3 Illustrated parts catalog - Compaq 6720t | HP Compaq 6720t Mobile Thin Cleint PC - Maintenance and Service G - Page 25
Miscellaneous parts Description 65-W HP Smart Adapter Power cords: For use in Australia and New T8M2.5×7.0 screw ● Torx T8M2.5×6.0 screw ● Torx T8M2.5×5.0 screw ● Torx T8M2.5×4.0 screw Spare part number 391172-001 246959-011 246959-201 246959-291 246959-AD1 246959-001 417526-001 Miscellaneous - Compaq 6720t | HP Compaq 6720t Mobile Thin Cleint PC - Maintenance and Service G - Page 26
-AD1 Power cord for use in South Korea 391172-001 65-W HP Smart Adapter 414046-001 1024-MB, PC2-5300, 667-MHz, DDR2 memory module 417520-001 Switch cover (includes LED board and cable) 417526-001 Screw Kit 417527-001 Plastics Kit (see Plastics Kit on page 16 for more Plastics Kit spare part - Compaq 6720t | HP Compaq 6720t Mobile Thin Cleint PC - Maintenance and Service G - Page 27
-231 Keyboard for use in Slovakia 481424-251 Keyboard for use in Russia 481424-291 Keyboard for use in Japan 417025-AB1 Keyboard for use in Taiwan 481424-AD1 Keyboard for use in South Korea 481424-BA1 For use in the Netherlands 481424-BB1 For use in Sweden and Finland Sequential part number listing - Compaq 6720t | HP Compaq 6720t Mobile Thin Cleint PC - Maintenance and Service G - Page 28
Spare part Description number 481424-BG1 For use in Slovenia 481424-B31 For use in Israel 481424-B71 For use in Switzerland 481424-DD1 For use in Iceland 481424-DJ1 For use in Greece 20 Chapter 3 Illustrated parts catalog - Compaq 6720t | HP Compaq 6720t Mobile Thin Cleint PC - Maintenance and Service G - Page 29
) away from the work area to prevent damage. Plastic parts Using excessive force during disassembly and reassembly can damage plastic parts. Use care when handling the plastic parts. Apply pressure only at the points designated in the maintenance instructions. Preliminary replacement requirements 21 - Compaq 6720t | HP Compaq 6720t Mobile Thin Cleint PC - Maintenance and Service G - Page 30
by the connector whenever possible. In all cases, avoid bending, twisting, or tearing cables. Be sure that cables are routed in such a way that they cannot be caught or snagged by parts being removed or replaced. Handle flex cables with extreme care; these cables tear easily. Drive handling CAUTION - Compaq 6720t | HP Compaq 6720t Mobile Thin Cleint PC - Maintenance and Service G - Page 31
integrated circuits provide some protection, but in many cases, ESD contains enough power to alter device parameters or melt silicon junctions. A discharge of static V 21,000 V 11,000 V 55% 7,500 V 3,000 V 400 V 400 V 2,000 V 3,500 V 7,000 V 5,000 V Preliminary replacement requirements 23 - Compaq 6720t | HP Compaq 6720t Mobile Thin Cleint PC - Maintenance and Service G - Page 32
, parts, and assemblies by the case or PCM laminate. Handle these items only at static-free workstations. ● Avoid contact with pins, leads, or circuitry. ● Turn off power and input signals before inserting or removing connectors or test equipment. 24 Chapter 4 Removal and replacement procedures - Compaq 6720t | HP Compaq 6720t Mobile Thin Cleint PC - Maintenance and Service G - Page 33
with hard ties to the ground ● Field service lists the shielding protection provided by antistatic bags and floor mats. Material Antistatic plastic Carbon-loaded plastic Metallized laminate Use Bags Floor mats Floor mats Voltage protection level 1,500 V 7,500 V 5,000 V Preliminary replacement - Compaq 6720t | HP Compaq 6720t Mobile Thin Cleint PC - Maintenance and Service G - Page 34
unplugging the power cord from the AC outlet and then unplugging the AC adapter from the computer. 4. Remove the battery (see Battery on page 29). 5. Remove the real-time clock (RTC) battery (see System board and system board frame on page 52). 6. Wait approximately 5 minutes. 7. Replace the RTC - Compaq 6720t | HP Compaq 6720t Mobile Thin Cleint PC - Maintenance and Service G - Page 35
sizes, that must be removed, replaced, or loosened when servicing the computer. Make special note of each screw size and screw lock location during removal and replacement. Serial number Report the computer serial number to HP when requesting information or ordering spare parts. The serial number is - Compaq 6720t | HP Compaq 6720t Mobile Thin Cleint PC - Maintenance and Service G - Page 36
Computer feet The computer feet are adhesive-backed rubber pads. The feet are included in the Rubber Kit, spare part number 480830-001. There are four oblong rubber feet (1) and four square rubber feet (2), that attach to the base enclosure in the locations illustrated below. - Compaq 6720t | HP Compaq 6720t Mobile Thin Cleint PC - Maintenance and Service G - Page 37
, 47-Wh Li-ion battery Spare part number 467784-001 Before disassembling the computer . 3. Disconnect the power from the computer by first unplugging the power cord from the AC outlet and then unplugging the AC adapter from the computer. until you hear a click. Component replacement procedures 29 - Compaq 6720t | HP Compaq 6720t Mobile Thin Cleint PC - Maintenance and Service G - Page 38
devices connected to the computer. 3. Disconnect the power from the computer by first unplugging the power cord from the AC outlet and then unplugging the AC adapter from the computer. 4. Remove the battery (see Battery on page 29). Remove the flash drive: 1. Position the computer with the front - Compaq 6720t | HP Compaq 6720t Mobile Thin Cleint PC - Maintenance and Service G - Page 39
5. Remove the flash drive (3) from the flash drive bay. 6. If it is necessary to replace the flash drive bracket, slide the module out of the bracket. Reverse this procedure to reassemble and install the flash drive. Memory module Description 1024-MB (PC2-5300, 667-MHz, DDR2) Spare part number - Compaq 6720t | HP Compaq 6720t Mobile Thin Cleint PC - Maintenance and Service G - Page 40
it up and to the left, and remove the cover. The memory module compartment cover is included in the Plastics Kit, spare part number 417527-001. 3. Spread the retaining tabs (1) on each side of the memory module slot to release the memory module. (The edge of the module opposite the slot rises away - Compaq 6720t | HP Compaq 6720t Mobile Thin Cleint PC - Maintenance and Service G - Page 41
from the computer by first unplugging the power cord from the AC outlet and then unplugging the AC adapter from the computer. 4. Remove the battery (see Battery on page 29). Remove the optical drive: 1. Position the computer with the left side toward you. 2. Remove the Torx T8M2.5×9.0 screw (1) that - Compaq 6720t | HP Compaq 6720t Mobile Thin Cleint PC - Maintenance and Service G - Page 42
7. Remove the optical drive bracket (2). Reverse this procedure to reassemble and install an optical drive. 34 Chapter 4 Removal and replacement procedures - Compaq 6720t | HP Compaq 6720t Mobile Thin Cleint PC - Maintenance and Service G - Page 43
-091 Spare part number 481424- removing the switch cover and keyboard, follow these steps: 1. power from the computer by first unplugging the power cord from the AC outlet and then unplugging the AC adapter from the computer. 4. Remove the battery (see Battery on page 29). Component replacement - Compaq 6720t | HP Compaq 6720t Mobile Thin Cleint PC - Maintenance and Service G - Page 44
you. 3. Open the computer as far as possible. 4. Slide the four keyboard retention tabs (1) toward you. The tabs are located between the esc and keyboard (2) until it rests at an angle. 6. Slide the keyboard back (3) until it rests against the display. 36 Chapter 4 Removal and replacement procedures - Compaq 6720t | HP Compaq 6720t Mobile Thin Cleint PC - Maintenance and Service G - Page 45
7. Release the zero insertion force (ZIF) connector (1) to which the keyboard cable is attached, and disconnect the keyboard cable (2) from the system board. 8. Remove the keyboard. Reverse this procedure to install the keyboard. Component replacement procedures 37 - Compaq 6720t | HP Compaq 6720t Mobile Thin Cleint PC - Maintenance and Service G - Page 46
cleared. Description RTC battery Spare part number 449137-001 Before removing the power from the computer by first unplugging the power cord from the AC outlet and then unplugging the AC adapter from the computer. 4. Remove the battery (see Battery on page 29). 5. Remove the keyboard (see Keyboard - Compaq 6720t | HP Compaq 6720t Mobile Thin Cleint PC - Maintenance and Service G - Page 47
Heat sink (includes replacement thermal material) Spare part number 468102-001 power from the computer by first unplugging the power cord from the AC outlet and then unplugging the AC adapter from the computer. 4. Remove the battery (see Battery on page 29). 5. Remove the keyboard (see Keyboard - Compaq 6720t | HP Compaq 6720t Mobile Thin Cleint PC - Maintenance and Service G - Page 48
Reverse this procedure to install the heat sink. 40 Chapter 4 Removal and replacement procedures - Compaq 6720t | HP Compaq 6720t Mobile Thin Cleint PC - Maintenance and Service G - Page 49
module Description Spare part number Broadcom 802.11a power from the computer by first unplugging the power cord from the AC outlet and then unplugging the AC adapter from the computer. 4. Remove the battery (see Battery on page 29). 5. Remove the keyboard (see Keyboard replacement procedures 41 - Compaq 6720t | HP Compaq 6720t Mobile Thin Cleint PC - Maintenance and Service G - Page 50
3. Remove the WLAN module (3) by pulling the module away from the slot at an angle. NOTE: WLAN modules are designed with a notch (4) to prevent incorrect installation. Reverse this procedure to install the WLAN module. 42 Chapter 4 Removal and replacement procedures - Compaq 6720t | HP Compaq 6720t Mobile Thin Cleint PC - Maintenance and Service G - Page 51
board and cable) Spare part number 417520-001 Before power from the computer by first unplugging the power cord from the AC outlet and then unplugging the AC adapter from the computer. 4. Remove the battery (see Battery on page 29). 5. Remove the keyboard (see Keyboard replacement procedures 43 - Compaq 6720t | HP Compaq 6720t Mobile Thin Cleint PC - Maintenance and Service G - Page 52
7. Remove the switch cover (2) by lifting it straight up. Reverse this procedure to install the switch cover. 44 Chapter 4 Removal and replacement procedures - Compaq 6720t | HP Compaq 6720t Mobile Thin Cleint PC - Maintenance and Service G - Page 53
by first unplugging the power cord from the AC outlet and then unplugging the AC adapter from the computer. 4. Remove the battery (see Battery on page 29). 5. Disconnect the wireless antenna cables from the WLAN module (see WLAN module on page 41). 6. Remove the keyboard (see Keyboard on page 35 - Compaq 6720t | HP Compaq 6720t Mobile Thin Cleint PC - Maintenance and Service G - Page 54
. 6. Lift the display assembly (2) straight up and remove it. 7. If it is necessary to replace the display bezel, display inverter, or display hinges, remove the rubber screw covers and screws listed below. (1) Four rubber screw covers on the display bezel top edge. (2) Two rubber screw covers - Compaq 6720t | HP Compaq 6720t Mobile Thin Cleint PC - Maintenance and Service G - Page 55
9. Remove the display bezel (4). The display bezel is available using spare part number 466164-001. 10. If it is necessary to replace the display inverter, disconnect the display panel cable (1) and the backlight cable (2) from the display inverter. 11. Remove the six Torx T8M2.5×5.0 screws (1) that - Compaq 6720t | HP Compaq 6720t Mobile Thin Cleint PC - Maintenance and Service G - Page 56
13. Remove the display inverter (3). The display inverter is available using spare part number 466167-001. 14. If it is necessary to replace the display hinges, remove the four Phillips PM2.0×4.0 screws (1) that secure each display hinge to the display panel. 15. Remove the display hinges (2). The - Compaq 6720t | HP Compaq 6720t Mobile Thin Cleint PC - Maintenance and Service G - Page 57
cable) Spare part number 466423- power cord from the AC outlet and then unplugging the AC adapter from the computer. 4. Remove the battery (see Battery on page 29). 5. Remove the following components: a. Optical drive (see Optical drive on page 33) b. Keyboard (see Keyboard replacement procedures 49 - Compaq 6720t | HP Compaq 6720t Mobile Thin Cleint PC - Maintenance and Service G - Page 58
the TouchPad board cable (4) from the system board. 10. Remove the top cover. Reverse this procedure to install the top cover. 50 Chapter 4 Removal and replacement procedures - Compaq 6720t | HP Compaq 6720t Mobile Thin Cleint PC - Maintenance and Service G - Page 59
the computer by first unplugging the power cord from the AC outlet and then unplugging the AC adapter from the computer. 4. Remove the battery (see Battery on page 29). 5. Remove the following components: a. Optical drive (see Optical drive on page 33) b. Keyboard (see Keyboard on page 35) c. Switch - Compaq 6720t | HP Compaq 6720t Mobile Thin Cleint PC - Maintenance and Service G - Page 60
the power cord from the AC outlet and then unplugging the AC adapter from the computer. 4. Remove the battery (see Battery on page 29). 5. Remove the following components: a. Flash drive (see Flash drive on page 30) b. Optical drive (see Optical drive on page 33) c. Keyboard (see Keyboard on - Compaq 6720t | HP Compaq 6720t Mobile Thin Cleint PC - Maintenance and Service G - Page 61
defective system board and installed on the replacement system board: ● Memory module (see Memory module on page 31) ● WLAN connector until the connector is clear. 8. Use the optical drive connector (2) to release the system board frame and system board from the base enclosure. Component replacement - Compaq 6720t | HP Compaq 6720t Mobile Thin Cleint PC - Maintenance and Service G - Page 62
the modem module cable (1) from the two clips built into the system board. 11. Release the RJ-11 connector (2) from the clip built into the system board. 12. Remove the three Torx T8M2.5×4.0 screws (3) that secure (1) until it rests at an angle. 54 Chapter 4 Removal and replacement procedures - Compaq 6720t | HP Compaq 6720t Mobile Thin Cleint PC - Maintenance and Service G - Page 63
Spare part power cord from the AC outlet and then unplugging the AC adapter from the computer. 4. Remove the battery (see Battery on page 29). 5. Remove the following components: a. Flash drive (see Flash drive on page 30) b. Optical drive (see Optical drive on page 33) c. Keyboard (see Keyboard - Compaq 6720t | HP Compaq 6720t Mobile Thin Cleint PC - Maintenance and Service G - Page 64
system board right side up, with the front toward you. 4. Disengage the hook on the PC Card assembly from the tab (1) on the system board connector. 5. Remove the PC Card assembly (2). Reverse the preceding procedure to install the PC Card assembly. 56 Chapter 4 Removal and - Compaq 6720t | HP Compaq 6720t Mobile Thin Cleint PC - Maintenance and Service G - Page 65
part number power cord from the AC outlet and then unplugging the AC adapter from the computer. 4. Remove the battery (see Battery on page 29). 5. Remove the following components: a. Flash drive (see Flash drive on page 30) b. Optical drive (see Optical drive on page 33) c. Keyboard (see Keyboard - Compaq 6720t | HP Compaq 6720t Mobile Thin Cleint PC - Maintenance and Service G - Page 66
Spare part power cord from the AC outlet and then unplugging the AC adapter from the computer. 4. Remove the battery (see Battery on page 29). 5. Remove the following components: a. Flash drive (see Flash drive on page 30) b. Optical drive (see Optical drive on page 33) c. Keyboard (see Keyboard - Compaq 6720t | HP Compaq 6720t Mobile Thin Cleint PC - Maintenance and Service G - Page 67
2. Lift the rear edge of the audio/USB board (2) until the board is clear of the base enclosure. 3. Remove the audio/USB board from the base enclosure. Reverse this procedure to install the audio/USB board. Component replacement procedures 59 - Compaq 6720t | HP Compaq 6720t Mobile Thin Cleint PC - Maintenance and Service G - Page 68
not working or will not load. NOTE: Some of the Computer Setup menu items listed in this guide may not be supported by your computer. NOTE: Pointing devices are not supported in Computer Setup. You must use the keyboard to navigate and make selections. To start Computer Setup: 1. Turn on or restart - Compaq 6720t | HP Compaq 6720t Mobile Thin Cleint PC - Maintenance and Service G - Page 69
the lower-left corner of the screen. Because Computer Setup is not Windows-based, it does not support the TouchPad. Navigation and selection are by keystroke: ● To choose to select File > Save changes and exit. Then follow the instructions on the screen. Your preferences go into effect when the - Compaq 6720t | HP Compaq 6720t Mobile Thin Cleint PC - Maintenance and Service G - Page 70
the processor, cache and memory size, system ROM, video revision, and keyboard controller version. Replace the configuration settings in NOTE: Some of the menu items listed in this section may not be supported by your computer. Select Setup Password Power-On Password Password Options Smart Card - Compaq 6720t | HP Compaq 6720t Mobile Thin Cleint PC - Maintenance and Service G - Page 71
● Enable/disable USB legacy support. When enabled, USB legacy support allows the following: ◦ Use of a USB keyboard in Computer Setup even when a Windows operating system is not running. ◦ Startup from bootable USB devices, including a hard drive, diskette drive, or optical drive connected by a USB - Compaq 6720t | HP Compaq 6720t Mobile Thin Cleint PC - Maintenance and Service G - Page 72
cm 14.05 in Height (front to rear) 3.0 to 3.6 cm 1.16 to 1.43 in Weight (equipped with optical drive, flash drive, and battery) 2.54 kg 5.6 lbs Input power Operating voltage 19.0 V dc @ 4.74 A - 90 W Operating current 4.74 A Temperature Operating (not writing to optical disc) 0°C to 35 - Compaq 6720t | HP Compaq 6720t Mobile Thin Cleint PC - Maintenance and Service G - Page 73
specifications Dimensions Height Width Diagonal Number of colors Contrast ratio Brightness Pixel resolution Pitch Format Configuration Backlight Character display Total power consumption Viewing angle Metric U.S. 20.7 cm 33.1 cm 39.1 cm Up to 16.8 million 200:1 (typical) 180 nits (typical) 8.15 - Compaq 6720t | HP Compaq 6720t Mobile Thin Cleint PC - Maintenance and Service G - Page 74
8X Max DVD-ROM Drive specifications Applicable disc Access time Random Cache buffer Data transfer rate CD-R (24X) CD-RW (10X) CD-ROM (24X) DVD (8X) Multiword DMA mode 2 DVD- - Compaq 6720t | HP Compaq 6720t Mobile Thin Cleint PC - Maintenance and Service G - Page 75
DMA specifications Hardware DMA System function DMA0 Not applicable DMA1* Not applicable DMA2* Not applicable DMA3 Not applicable DMA4 Direct memory access controller DMA5* Available for ExpressCard DMA6 Not assigned DMA7 Not assigned *ExpressCard controller can use DMA 1, 2, or - Compaq 6720t | HP Compaq 6720t Mobile Thin Cleint PC - Maintenance and Service G - Page 76
101-/102-Key or Microsoft® Natural Keyboard IRQ2 Cascaded IRQ3 Intel 82801DB/DBM USB2 Enhanced Host Controller-24CD IRQ4 COM1 IRQ5* Conexant AC-Link Audio Intel 82801DB/DBM SMBus Controller-24C3 Data Fax Modem with SmartCP IRQ6 Diskette drive IRQ7* Parallel port IRQ8 System CMOS - Compaq 6720t | HP Compaq 6720t Mobile Thin Cleint PC - Maintenance and Service G - Page 77
Port B Unused Keyboard controller Unused NMI enable/RTC Unused DMA page registers Unused Port A Unused Interrupt controller no. 2 System function (shipping configuration) Unused DMA controller no. 2 Unused Coprocessor busy clear/reset Unused Unused Secondary fixed disk controller Unused Primary - Compaq 6720t | HP Compaq 6720t Mobile Thin Cleint PC - Maintenance and Service G - Page 78
Unused Unused Reserved serial port Unused Infrared port Unused Unused Secondary diskette drive controller Parallel port (LPT1/default) Unused FM synthesizer-OPL3 Unused VGA Reserved (parallel port/no EPP support) VGA ExpressCard controller in CPU Unused Internal modem "A" diskette controller Serial - Compaq 6720t | HP Compaq 6720t Mobile Thin Cleint PC - Maintenance and Service G - Page 79
000E8000-000FFFFF 00100000-00FFFFFF 04800000-07FFFFFF 04800000-07FFFFFF 08000000-080FFFFF 08200000-FFFEFFFF FFFF0000-FFFFFFFF System function Base memory Video memory Video BIOS Unused System BIOS Extended memory Super extended memory Unused Video memory (direct access) Unused System BIOS System - Compaq 6720t | HP Compaq 6720t Mobile Thin Cleint PC - Maintenance and Service G - Page 80
7 Screw listing This section provides specification and reference information for the screws and screw locks used in the computer. All screws listed in this section are available in the Screw Kit, spare part number 417526-001. 72 Chapter 7 Screw listing - Compaq 6720t | HP Compaq 6720t Mobile Thin Cleint PC - Maintenance and Service G - Page 81
mm Thread 2.0 mm Head diameter 5.0 mm Where used: (1) Two captive screws that secure the flash drive bay cover to the computer (screws are captured on the cover by C-clips) (2) One captive screw that secures the memory module compartment cover to the computer (screw is captured on the cover by - Compaq 6720t | HP Compaq 6720t Mobile Thin Cleint PC - Maintenance and Service G - Page 82
Torx T8M2.5×9.0 screw Color Black Quantity 21 Length 9.0 mm Thread 2.5 mm Head diameter 5.0 mm Where used: (1) One screw that secures the optical drive to the computer (2) Two screws that secure the keyboard to the computer 74 Chapter 7 Screw listing - Compaq 6720t | HP Compaq 6720t Mobile Thin Cleint PC - Maintenance and Service G - Page 83
Where used: 6 screws that secure the display assembly to the computer Where used: 10 screws that secure the top cover to the computer Where used: 2 screws that secure the system board frame to the base enclosure Torx T8M2.5×9.0 screw 75 - Compaq 6720t | HP Compaq 6720t Mobile Thin Cleint PC - Maintenance and Service G - Page 84
Silver Phillips PM2.0×4.0 screw Color Silver Quantity 2 Length 4.0 mm Thread 2.0 mm Head diameter 4.5 mm Where used: 2 screws that secure the optical drive bracket to the optical drive 76 Chapter 7 Screw listing - Compaq 6720t | HP Compaq 6720t Mobile Thin Cleint PC - Maintenance and Service G - Page 85
Phillips PM2.0×3.0 screw Color Silver Quantity 6 Length 3.0 mm Thread 2.0 mm Head diameter 4.5 mm Where used: 2 screws that secure the WLAN module to the system board Phillips PM2.0×3.0 screw 77 - Compaq 6720t | HP Compaq 6720t Mobile Thin Cleint PC - Maintenance and Service G - Page 86
Where used: 4 screws that secure the heat sink to the computer Phillips PM2.5×3.0 screw Color Black Quantity 4 Length 3.0 mm Thread 2.5 mm Head diameter 5.0 mm Where used: 4 screws that secure the heat sink to the computer 78 Chapter 7 Screw listing - Compaq 6720t | HP Compaq 6720t Mobile Thin Cleint PC - Maintenance and Service G - Page 87
Phillips PM2.0×2.0 broad-head screw Color Black Quantity 5 Length 2.0 mm Thread 2.0 mm Head diameter 7.0 mm Where used: 3 screws that secure the switch cover to the computer Phillips PM2.0×2.0 broad-head screw 79 - Compaq 6720t | HP Compaq 6720t Mobile Thin Cleint PC - Maintenance and Service G - Page 88
Where used: 2 screws that secure the display assembly right hinge to the computer 80 Chapter 7 Screw listing - Compaq 6720t | HP Compaq 6720t Mobile Thin Cleint PC - Maintenance and Service G - Page 89
Torx T8M2.5×5.0 screw Color Black Quantity 14 Length 5.0 mm Thread 2.5 mm Head diameter 5.0 mm Where used: 4 screws that secure the display bezel top edge to the display assembly Where used: 6 screws that secure the display panel to the display enclosure Torx T8M2.5×5.0 screw 81 - Compaq 6720t | HP Compaq 6720t Mobile Thin Cleint PC - Maintenance and Service G - Page 90
Where used: 4 screws that secure the top cover to the base enclosure 82 Chapter 7 Screw listing - Compaq 6720t | HP Compaq 6720t Mobile Thin Cleint PC - Maintenance and Service G - Page 91
Torx T8M2.5×7.0 screw Color Black Quantity 2 Length 9.0 mm Thread 2.5 mm Head diameter 5.0 mm Where used: 2 screws that secure the display bezel bottom edge to the display assembly Torx T8M2.5×7.0 screw 83 - Compaq 6720t | HP Compaq 6720t Mobile Thin Cleint PC - Maintenance and Service G - Page 92
Black Phillips PM2.0×4.0 screw Color Black Quantity 10 Length 4.0 mm Thread 2.0 mm Head diameter 4.5 mm Where used: 8 screws that secure the display hinges to the display panel 84 Chapter 7 Screw listing - Compaq 6720t | HP Compaq 6720t Mobile Thin Cleint PC - Maintenance and Service G - Page 93
Where used: 2 screws that secure the PC Card assembly to the system board Black Phillips PM2.0×4.0 screw 85 - Compaq 6720t | HP Compaq 6720t Mobile Thin Cleint PC - Maintenance and Service G - Page 94
Torx T8M2.5×4.0 screw Color Black Quantity 5 Length 4.0 mm Thread 2.5 mm Heat width 5.0 mm Where used: 3 screws that secure the system board to the system board frame Where used: 2 screws that secure the audio/USB board to the base enclosure 86 Chapter 7 Screw listing - Compaq 6720t | HP Compaq 6720t Mobile Thin Cleint PC - Maintenance and Service G - Page 95
Phillips PM2.5×4.0 screw Color Black Quantity 2 Length 4.0 mm Thread 2.5 mm Head diameter 5.0 mm Where used: 2 screws that secure the modem module to the system board Phillips PM2.5×4.0 screw 87 - Compaq 6720t | HP Compaq 6720t Mobile Thin Cleint PC - Maintenance and Service G - Page 96
Torx T8M2.5×6.0 screw Color Black Quantity 5 Length 6.0 mm Thread 2.5 mm Head diameter 5.0 mm Where used: 5 screws that secure the system board frame to the base enclosure 88 Chapter 7 Screw listing - Compaq 6720t | HP Compaq 6720t Mobile Thin Cleint PC - Maintenance and Service G - Page 97
Hex HM5.0×11.0 screw lock Color Silver Quantity 2 Length 11.0 mm Thread 2.5 mm Head diameter 5.0 mm Where used: 2 screw locks that secure the system board to the system board frame Hex HM5.0×11.0 screw lock 89 - Compaq 6720t | HP Compaq 6720t Mobile Thin Cleint PC - Maintenance and Service G - Page 98
8 Connector pin assignments Audio-out (headphone) Pin Signal 1 Audio out, left channel 2 Audio out, right channel 3 Ground Audio-in (microphone) Pin Signal 1 Audio signal in 2 Audio signal in 3 Ground 90 Chapter 8 Connector pin assignments - Compaq 6720t | HP Compaq 6720t Mobile Thin Cleint PC - Maintenance and Service G - Page 99
External monitor Pin Signal 1 Red analog 2 Green analog 3 Blue analog 4 Not connected 5 Ground 6 Ground analog 7 Ground analog 8 Ground analog 9 +5 VDC 10 Ground 11 Monitor detect 12 DDC 2B data 13 Horizontal sync 14 Vertical sync 15 DDC 2B clock External monitor 91 - Compaq 6720t | HP Compaq 6720t Mobile Thin Cleint PC - Maintenance and Service G - Page 100
RJ-11 (modem) Pin Signal 1 Unused 2 Tip 3 Ring 4 Unused 5 Unused 6 Unused 92 Chapter 8 Connector pin assignments - Compaq 6720t | HP Compaq 6720t Mobile Thin Cleint PC - Maintenance and Service G - Page 101
RJ-45 (network) Pin Signal 1 Transmit + 2 Transmit - 3 Receive + 4 Unused 5 Unused 6 Receive - 7 Unused 8 Unused Universal Serial Bus Pin Signal 1 +5 VDC 2 Data - 3 Data + 4 Ground RJ-45 (network) 93 - Compaq 6720t | HP Compaq 6720t Mobile Thin Cleint PC - Maintenance and Service G - Page 102
countries and regions The requirements listed below are applicable to all countries and regions: ● The length of the power cord set must be at power system of each country or region. ● The appliance coupler must meet the mechanical configuration of an EN 60 320/IEC 320 Standard Sheet C13 connector - Compaq 6720t | HP Compaq 6720t Mobile Thin Cleint PC - Maintenance and Service G - Page 103
for evaluation in the country or region where it will be used. 5. The flexible cord must be Type VCTF, 3-conductor, 0.75-mm² conductor size. Power cord set fittings (appliance coupler and wall plug) must bear the certification mark of the agency responsible for evaluation in the country or region - Compaq 6720t | HP Compaq 6720t Mobile Thin Cleint PC - Maintenance and Service G - Page 104
these components, handle them carefully. NOTE: Materials Disposal. This HP product contains mercury in the backlight in the display assembly that Web site at http://www.eiae.org. This section provides disassembly instructions for the display assembly. The display assembly must be disassembled to - Compaq 6720t | HP Compaq 6720t Mobile Thin Cleint PC - Maintenance and Service G - Page 105
Perform the following steps to disassemble the display assembly: 1. Remove all screw covers (1) and screws (2) that secure the display bezel to the display assembly. 2. Lift up and out on the left and right inside edges (1) and the top and bottom inside edges (2) of the display bezel until the bezel - Compaq 6720t | HP Compaq 6720t Mobile Thin Cleint PC - Maintenance and Service G - Page 106
4. Disconnect all display panel cables (1) from the display inverter and remove the inverter (2). 5. Remove all screws (1) that secure the display panel assembly to the display enclosure. 6. Remove the display panel assembly (2) from the display enclosure. 7. Turn the display panel assembly upside - Compaq 6720t | HP Compaq 6720t Mobile Thin Cleint PC - Maintenance and Service G - Page 107
10. Remove the display panel frame (2) from the display panel. 11. Remove the screws (1) that secure the backlight cover to the display panel. 12. Lift the top edge of the backlight cover (2) and swing it outward. 13. Remove the backlight cover. 14. Turn the display panel right-side up. Display 99 - Compaq 6720t | HP Compaq 6720t Mobile Thin Cleint PC - Maintenance and Service G - Page 108
15. Remove the backlight cables (1) from the clip (2) in the display panel. 16. Turn the display panel upside down. WARNING! The backlight contains mercury. Exercise caution when removing and handling the backlight to avoid damaging this component and causing exposure to the mercury. 17. Remove the - Compaq 6720t | HP Compaq 6720t Mobile Thin Cleint PC - Maintenance and Service G - Page 109
18. Remove the backlight from the backlight frame. 19. Disconnect the display panel cable (1) from the LCD panel. 20. Remove the screws (2) that secure the LCD panel to the display rear panel. 21. Release the LCD panel (3) from the display rear panel. 22. Release the tape (4) that secures the LCD - Compaq 6720t | HP Compaq 6720t Mobile Thin Cleint PC - Maintenance and Service G - Page 110
61 Security menu 62 System Configuration menu 63 using 61 computer specifications 64 connectors power 10 service considerations 22 D Diagnostics menu 63 diskette drive precautions 22 product description 1 display assembly removal 45 spare part number 12, 19, 45 display bezel removal 46 spare - Compaq 6720t | HP Compaq 6720t Mobile Thin Cleint PC - Maintenance and Service G - Page 111
legacy support, Universal Serial Bus (USB) 63 light components 4 lights battery 4, 8 caps lock 4 drive 4, 8 numeric lock 4 power 4, 8 volume mute 4 wireless 4, 8 M memory check 63 memory map specifications 71 memory module product description 1 removal 31 spare part number 15, 18, 31 memory module - Compaq 6720t | HP Compaq 6720t Mobile Thin Cleint PC - Maintenance and Service G - Page 112
cards 1 flash drive 1 graphics 1 keyboard 2 memory module 1 modem module 1 operating system 2 optical drives 1 pointing devices 2 ports 1 power requirements 2 processor 1 product name 1 security 2 serviceability 2 wireless 1 product name 1 R rear components 10 removal/replacement preliminaries 21 - Compaq 6720t | HP Compaq 6720t Mobile Thin Cleint PC - Maintenance and Service G - Page 113
pin assignments 93 V vents 9, 10 volume down button 5 volume mute button 5 volume mute light 4 volume up button 5 W Windows applications key 6 Windows logo key 6 wireless antenna disconnecting 41 location 3 wireless button 5 wireless light 4, 8 wireless, product description 1 WLAN module removal 41 - Compaq 6720t | HP Compaq 6720t Mobile Thin Cleint PC - Maintenance and Service G - Page 114
HP Compaq 6720t Mobile Thin Client
Maintenance and Service Guide