Acer AL1751 AL1751 Service Guide
Acer AL1751 Manual
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- Acer AL1751 | AL1751 Service Guide - Page 1
Acer AL1751 Service Guide - Acer AL1751 | AL1751 Service Guide - Page 2
Service Guide Version and Revision No. Version 1 1.0 Release Date Mar.-14- 2005 Revision Original release 2 - Acer AL1751 | AL1751 Service Guide - Page 3
Technology Corp. ACER AL1751 Service Manual Printed in Taiwan. Disclaimer The information in this guide is subject to change without notice. Acer Incorporated makes no representations or warranties, either expressed or implied, with respect to the contents hereof and specifically disclaims any - Acer AL1751 | AL1751 Service Guide - Page 4
to avoid possible hardware or software problems. Remind you to do specific actions relevant to the accomplishment of procedures. Preface Before using this information and the product it supports, please read the following general information. 1. This Service Guide provides you with all technical - Acer AL1751 | AL1751 Service Guide - Page 5
used in accordance with the instructions, may cause harmful interference void the user's authority to operate the equipment. 2. Shielded interface cables and AC power cord, monitor to rain or moisture. Dangerously high voltages are present inside the monitor. Do not open the cabinet. Refer servicing - Acer AL1751 | AL1751 Service Guide - Page 6
. If you are not sure of the type of power supplied to your home, consult your dealer or local power company. The monitor is equipped with a three-pronged grounded plug, a plug with a third (grounding) pin. This plug will fit only into a grounded power outlet as a safety feature. If your outlet does - Acer AL1751 | AL1751 Service Guide - Page 7
Special Notes On LCD Monitors The following symptoms are normal with LCD monitor and do not indicate a problem. Notes Due to the nature of the fluorescent light, the screen may flicker during initial use. Turn off the Power Switch and then turn it on again to make sure the flicker disappears. You - Acer AL1751 | AL1751 Service Guide - Page 8
1 Monitor Features Introduction Electrical Requirements LCD Monitor General Specification LCD Panel Specification Block Diagram Main Board Diagram Software Flow chart Main Board Layout Front Bezel Rear Bezel Adjusting the picture LOGO Chapter 2 Machine Disassembly Chapter 3 Troubleshooting Chapter - Acer AL1751 | AL1751 Service Guide - Page 9
This specification defines the requirements for the 17" MICRO-PROCESSOR based Multi-mode supported high resolution color LCD monitor. This monitor can be directly connected to general 15 pin D-sub VGA connector and 24 pin DVI connector. It also supports VESA DPMS power management and plug & play - Acer AL1751 | AL1751 Service Guide - Page 10
for LCD failures Warm up time All specifications : ģ30 minutes Fully functional : 5 seconds Measuring equipment : Chroma 7120 signal generator or equivalent, directly Connected to the monitor under test. Control settings Minolta CA100 photometer, or equivalent User brightness control - Acer AL1751 | AL1751 Service Guide - Page 11
LCD Monitor General Specification Panel type : 17 " active matrix color TFT LCD Display size SAMSUNG DVI-D 24pin Interface frequency : Horizontal Frequency 30KHz ----83KHz Vertical Frequency 55Hz ------75Hz Plug & play : VESA DDC2B, VESA DPMS Power Input voltage Total output power - Acer AL1751 | AL1751 Service Guide - Page 12
LCD Panel Specification LCD Panel Model (SAMSUNG LTM170EU-L21) Display Type active matrix color TFT LCD Resolution 1280x1024 pixels Display Dot 1280x (RGB) x 1024 Display Area 337.92mm(H) x 270.336mm(V) Pixel Pitch 0.264mm(H) x 0.264mm(V) Display Color 16.2M (true) Lamp Frequency - Acer AL1751 | AL1751 Service Guide - Page 13
Supported Timing Mode VGA SVGA XGA SXGA DOS DOS XGA VGA SVGA Resolution 640x480@60Hz 640x480@72Hz 640x480@75Hz 800x600@56Hz 800x600@60Hz 800x600@72Hz 800x600@75Hz 1024x768@60Hz 1024x768@70Hz 1024x768@75Hz 1152x864@75Hz 1280x1024@60H z 1280x1024@ - Acer AL1751 | AL1751 Service Guide - Page 14
The LCD MONITOR will contain a main board (include: keypad board and audio board), an inverter board, adapter which house the flat panel control logic, brightness control logic and DDC. The Inverter board will drive the backlight of panel. The adapter will provide the 12V DC-power to inverter/power - Acer AL1751 | AL1751 Service Guide - Page 15
Main Board Diagram EEPROM 24C16 MCU LCD Interface Scaler TSU56AK PQFP-128 (Include: ADC, OSD etc) Crystal 14.318MHZ OSD Control Interface (Keypad) DVI Connector EEPROM 24C02 D-SUB Connector EEPROM 24C02 15 - Acer AL1751 | AL1751 Service Guide - Page 16
. Check the pin PANEL1 and PANEL2 to tell which panel to get with it. 5) Is the power key pressed? 6) Clear all global flags. 7) Are the AUTO and SELECT keys pressed? 8) Enter factory mode. 9) Saving the power key status into eeprom. Turn on the LED and set it to green color. Scalar initializes - Acer AL1751 | AL1751 Service Guide - Page 17
Main Board Layout 17 - Acer AL1751 | AL1751 Service Guide - Page 18
W78E65-40P AT24C16AN-10SI-2.7 SI-8050SD AZ1117D-1.8 D-SUB 15PIN DVID CONN. 24P FEMALE PIN HEADER 24P 2.0mm WAFER 4P RIGHT ANGLE PHONE JACK PHONE JACK power jack WAFER 6P RIGHT ANGLE PI TDA7496L BY ST CRYSTAL 14.318MHzHC-49U 20MHZ 18 - Acer AL1751 | AL1751 Service Guide - Page 19
Front Bezel 19 - Acer AL1751 | AL1751 Service Guide - Page 20
20 - Acer AL1751 | AL1751 Service Guide - Page 21
Rear Bezel 21 - Acer AL1751 | AL1751 Service Guide - Page 22
Adjusting the Picture 22 - Acer AL1751 | AL1751 Service Guide - Page 23
23 - Acer AL1751 | AL1751 Service Guide - Page 24
b. The Description For Control Function 24 - Acer AL1751 | AL1751 Service Guide - Page 25
25 - Acer AL1751 | AL1751 Service Guide - Page 26
This reduces the monitor's internal power supply consumption. After the video input signal is restored, full power is restored plug with NEMA 5-15 style and is UL listed and CSA labeled. The voltage rating for the power cord shall be 125 volts AC. Supplied with units intended for connection to power - Acer AL1751 | AL1751 Service Guide - Page 27
Chapter 2 Machine Disassembly This chapter contains step-by-step procedures on how to assemble the monitor for maintenance. Disassembly Procedure 1. Remove two screws to release back cover. (Fig 1). 2. Remove the base stand (Fig 2) Fig 1 Fig2 3. Remove four screws to release front - Acer AL1751 | AL1751 Service Guide - Page 28
Fig 3 Fig 4 5. Remove eleven screws to release top cover and bottom cover. (Fig 5) 6. Remove the main board. (Fig 6) 28 - Acer AL1751 | AL1751 Service Guide - Page 29
Fig 5 Fig 6 7.Remove six clamps to release shield and the main board. (Fig 7) 8.Remove the main frame. (Fig 8) 9.Remove the inverter board. (Fig 9) 29 - Acer AL1751 | AL1751 Service Guide - Page 30
Fig 7 Fig 8 30 - Acer AL1751 | AL1751 Service Guide - Page 31
Fig 9 31 - Acer AL1751 | AL1751 Service Guide - Page 32
This chapter provides troubleshooting information for the AL1751: 1. No power No power Press power key and look if the picture is normal NG Measure 12V input voltage OK NG Check the adapter section Measure U702 PIN2=5V? NG OK Replace U702 NG X402 oscillate waveform is normal NG - Acer AL1751 | AL1751 Service Guide - Page 33
2. No picture (LED is orange) No picture NG Key is under control? OK X401 oscillate waveform is normal X402 oscillate waveform is normal NG Replace X402 OK Replace U402 OK NG Replace X401 NG Check if the sync signal from computer is output and video cable is connected normally Replace U401 - Acer AL1751 | AL1751 Service Guide - Page 34
3. Panel Power Circuit Measure Q703 base is high level? OK NG Check Q703 and Q704 are broken or CN503 solder? Check Correspondent component. NG OK Replace PANEL X402 oscillate waveform is normal NG Replace X402 OK Replace U402 NG Replace U401 34 - Acer AL1751 | AL1751 Service Guide - Page 35
4. Keypad Board OSD is unstable or not working NG Is Keypad board connecting normally OK NG Is Button Switch normally OK NG Is Keypad board normally Connect Keypad Board Replace Button Switch Replace Keypad Board 35 - Acer AL1751 | AL1751 Service Guide - Page 36
5. Inverter Board No Backlight Check CN801 Pin1 =12V OK NG Check adapter Check ON/OFF signal NG OK Check U801 PIN3 voltage is normal? OK NG Check U801 PIN18 triangular wave is normal Check Interface board Check - Acer AL1751 | AL1751 Service Guide - Page 37
6.No Audio Mute and volume setting is ok? NG OK Reset mute and volume Check power supply of U601 is 12V? NG OK Check input signal of U601is ok? Check connecting is ok? NG Reconnect NG OK Check correspondent component Replace U601 NG Replace speaker 37 - Acer AL1751 | AL1751 Service Guide - Page 38
(DVI) DESCRIPTION TMDS Data2TMDS Data2+ TMDS Data 2/4 Shield TMDS Data4TMDS Data4+ DDC Clock DDC Data Analogue Vertical Sync TMDS Data1TMDS Data1+ TMDS Data 1/3 Shield TMDS Data3- PI N NO. 13. 14. 15. 16. 17. 18. 19. 20. 21. 22. 23. 24. DESCRIPTION TMDS Data3+ +5V Power Ground Hot Plug Detect - Acer AL1751 | AL1751 Service Guide - Page 39
have a DIFFERENT part number code from those given in the FRU list of this printed Service Guide. You MUST use the local FRU list provided by your regional Acer office to order FRU parts for repair and service of customer machines. NOTE: To scrap or to return the defective parts, you should follow - Acer AL1751 | AL1751 Service Guide - Page 40
Exploded Diagram (Model: AL1751) 40 - Acer AL1751 | AL1751 Service Guide - Page 41
Part List Item 1 Picture 2 Description Hinge cover Part No. 33G4843 QT L 33G4841 QT L Bezel 34G1538AQW B 3 Back cover 34G1540 QT B 4 SHIELDING 85L6117 1 41 - Acer AL1751 | AL1751 Service Guide - Page 42
5 MAIN FRAME 15L6190 1 6 Panel 750LLS70U21 7 Power board INPC1742SEA2 8 Main board CBPC780KS2AY 9 Speakers 78G 322 3 L& 78G 322 3 R 42 - Acer AL1751 | AL1751 Service Guide - Page 43
- Acer AL1751 | AL1751 Service Guide - Page 44
VCC12V_AUDIO AUDIO_MU AUDIO_SD 7.AUDIO B4 VOLUME onBACKLITE onPanel_5V/3.3V VCPU VCC12V_AUDIO VCC3.3 VCC1.8 AdjBACKLITE VAA1 VAA2 VAA3 VAA4 VLCD 2.POWER R+ RG+ GB+ 5.PANEL INTERFACE Title Size B Date: TSU56AK FOR ACER Document Number TOP Wednesday, January 19, 2005 Sheet 2 Rev D of 8 44 - Acer AL1751 | AL1751 Service Guide - Page 45
2 5 /ON 3 GND CN701 LP701 POWER JACK 1+12V_IN 6 3 5 2 4 1 INDUTOR-P VCC12V U701 SI-8050SD 1 VIN FBK 4 2 Vout + + Hole Screw Hole Screw Hole Screw Hole 1 1 1 1 1 1 Title Size B Date: TSU56AK FOR ACER Document Number POWER Wednesday, January 19, 2005 Sheet 3 Rev D of 8 45 - Acer AL1751 | AL1751 Service Guide - Page 46
0.1uF C315 0.1uF 2 3 1 2 3 1 2 3 1 2 3 1 2 3 1 2 3 1 2 3 1 2 3 1 VCC5V C319 0.1uF C320 0.1uF C321 0.1uF C322 0.1uF C323 0.1uF C324 0.1uF C325 0.1uF C326 0.1uF Title Size B Date: TSU56AK FOR ACER Document Number INPUT Wednesday, January 19, 2005 Sheet 4 Rev D of 8 46 - Acer AL1751 | AL1751 Service Guide - Page 47
VDVI 600 OHM C421 + 10uF/16V C422C423 0.1uF0.1uF 3 VAA4 VAA4 FB407 VDPLL 600 OHM C429 + 10uF/16V C430 0.1uF Title Size B Date: TSU56AK FOR ACER Document Number SCALER Wednesday, January 19, 2005 Sheet 5 Rev D of 8 - Acer AL1751 | AL1751 Service Guide - Page 48
+ RXEC+ RXE3+ LVB0P LVB1P LVB2P LVBCKP LVB3P LVA0P LVA1P LVA2P LVACKP LVA3P CONN VLCD VLCD 3 C448 + 47uF/16V C446 0.1uF C447 0.1uF Title TSU56AK FOR ACER Size Document Number Rev A PANEL INTERFACE D Date: Wednesday, January 19, 2005 Sheet 6 of 8 48 - Acer AL1751 | AL1751 Service Guide - Page 49
1000pF ENTER R430 470` 1/16W RIGHT R431 470` 1/16W AUTO R432 470` 1/16W LEFT R435 470` 1/16W POWER R436 470` 1/16W D404 BAV99 C443 0.001uF D405 BAV99 C442 0.001uF 49 2 3 1 2 3 1 SW401 LCD ONOFF SW402 KEY LEFT 0.001uF SW403 SW404 KEY AUTO KEY RIGHT SW405 KEY MENU Title TSU56AK FOR ACER - Acer AL1751 | AL1751 Service Guide - Page 50
220K` 1/16W C613 0.1uF Volume 5 OUT_L OUT_R CN603 1 5 4 3 2 7 8 EAR PHONEJACK R608 R609 75` 1/16W 75` 1/16W OUT_R OUT_L CN601 1 2 3 4 SPEAKER CONN 50 Title TSU56AK FOR ACER Size A4 Document Number Rev Date: Wednesday, January 19, 2005 Sheet 8 of 8 - Acer AL1751 | AL1751 Service Guide - Page 51
Adapter Board 51 - Acer AL1751 | AL1751 Service Guide - Page 52
R804 10K` 1/10W Inverter Board 2 CN801 VIN 1 2 VIN ON/OFF 3 DIM 4 5 GND GND 6 33L8009-6N-H F801 4A/24V C845 220uF/16V C848 220uF/25V + + Q804 DTC144WKA R801 1K` 1/16W Q802 DTA144WKA R803 100` 1/8W Q803 PMBS3904 VDD C801 1uF/25V C802 1uF/25V C803 1uF/25V RLZTE-11 5.6B ZD802 1 2 10K`