Dell OptiPlex 7780 All In One OptiPlex 7780 All-In-One Service Manual
Dell OptiPlex 7780 All In One Manual
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- Dell OptiPlex 7780 All In One | OptiPlex 7780 All-In-One Service Manual - Page 1
OptiPlex 7780 All-In-One Service Manual Regulatory Model: W27C Regulatory Type: W27C001/W27C002 May 2020 Rev. A00 - Dell OptiPlex 7780 All In One | OptiPlex 7780 All-In-One Service Manual - Page 2
of data and tells you how to avoid the problem. WARNING: A WARNING indicates a potential for property damage, personal injury, or death. © 2020 Dell Inc. or its subsidiaries. All rights reserved. Dell, EMC, and other trademarks are trademarks of Dell Inc. or its subsidiaries. Other trademarks may be - Dell OptiPlex 7780 All In One | OptiPlex 7780 All-In-One Service Manual - Page 3
Contents 1 Safety instructions...6 Before working inside your computer...6 Before you begin ...6 Electrostatic discharge-ESD protection...7 ESD field service kit ...7 Transporting sensitive components...8 After working inside your computer...8 2 Removing and installing components 10 Recommended - Dell OptiPlex 7780 All In One | OptiPlex 7780 All-In-One Service Manual - Page 4
Installing the wireless card...38 Camera assembly...40 Removing the camera assembly...40 Installing the camera assembly...41 Bottom cover...42 Removing the bottom cover...42 Installing the bottom cover...43 Power-supply unit...44 Removing the power-supply unit (PSU)...44 Installing the power-supply - Dell OptiPlex 7780 All In One | OptiPlex 7780 All-In-One Service Manual - Page 5
System and setup password...93 Assigning a system setup password...94 Deleting or changing an existing system setup password 94 5 Troubleshooting...95 Dell SupportAssist Pre-boot System Performance Check diagnostics 95 Running the SupportAssist Pre-Boot System Performance Check 95 Display built - Dell OptiPlex 7780 All In One | OptiPlex 7780 All-In-One Service Manual - Page 6
, not by its pins. CAUTION: You should only perform troubleshooting and repairs as authorized or directed by the Dell technical assistance team. Damage due to servicing that is not authorized by Dell is not covered by your warranty. See the safety instructions that shipped with the product or at www - Dell OptiPlex 7780 All In One | OptiPlex 7780 All-In-One Service Manual - Page 7
shut-down instructions. 3. Disconnect such as intermittent problems or a shortened Dell products, the sensitivity to static damage is now higher than in previous Dell damage to recognize and troubleshoot is the intermittent (also known as bonding. Use only Field Service kits with a wrist strap, mat, - Dell OptiPlex 7780 All In One | OptiPlex 7780 All-In-One Service Manual - Page 8
one desktop or portable environment. Servers are typically installed in a rack within a data center; desktops new service technicians use the traditional wired ESD grounding wrist strap and protective anti-static mat at all times when servicing Dell Abdominal muscles support your spine when instructions - Dell OptiPlex 7780 All In One | OptiPlex 7780 All-In-One Service Manual - Page 9
parts that you removed before working on your computer. 4. Connect your computer and all attached devices to their electrical outlets. 5. Turn on your computer. Safety instructions 9 - Dell OptiPlex 7780 All In One | OptiPlex 7780 All-In-One Service Manual - Page 10
are not left attached to such surface when replacing a component. NOTE: Screw color may vary with the configuration ordered. Table 1. OptiPlex 7780 All-in-One screw list Component Screw type Cable cover-optional M3x9 Quantity 1 Screw image System-board shield M3x5 5 Bottom cover M3x5 - Dell OptiPlex 7780 All In One | OptiPlex 7780 All-In-One Service Manual - Page 11
Table 1. OptiPlex 7780 All-in-One screw list(continued) Component Screw type Quantity Camera door M3x5 2 Heat sink-UMA Captive screws 5 Heat sink-Discrete Captive screws 9 Power-supply unit (PSU) M3x5 2 - Dell OptiPlex 7780 All In One | OptiPlex 7780 All-In-One Service Manual - Page 12
on an elevated, clean, and flat surface. It is recommended to remove the stand to avoid accidental damage to the system display during servicing. About this task The following image provides a visual representation of the articulating stand removal procedure. 12 Removing and installing components - Dell OptiPlex 7780 All In One | OptiPlex 7780 All-In-One Service Manual - Page 13
Steps 1. Press and slide the release button up. 2. Hold the button in the release position, and lift the stand upward. 3. Slide the stand downward, to lift the stand off the back cover. 4. Pry the rubber feet from the bottom cover and pull it out. Installing the articulating stand Prerequisites If - Dell OptiPlex 7780 All In One | OptiPlex 7780 All-In-One Service Manual - Page 14
Steps 1. Align the rubber feet with the slots on the bottom cover and push it firmly in place. 14 Removing and installing components - Dell OptiPlex 7780 All In One | OptiPlex 7780 All-In-One Service Manual - Page 15
remove the Height Adjustable Stand with Optical Disk Drive. 1. Follow the procedure in Before working inside your computer. CAUTION: When servicing the system, place it on an elevated, clean, and flat surface. Dell recommends removing the stand to avoid accidental damage to the system display during - Dell OptiPlex 7780 All In One | OptiPlex 7780 All-In-One Service Manual - Page 16
Installing the height adjustable stand Prerequisites If you are replacing a component, remove the existing component before performing the installation procedure. NOTE: Follow the same procedure to install the Height Adjustable Stand with Optical Disk Drive. About this task The following image - Dell OptiPlex 7780 All In One | OptiPlex 7780 All-In-One Service Manual - Page 17
on an elevated, clean, and flat surface. It is recommended to remove the stand to avoid accidental damage to the system display during servicing. 2. Remove the stand. About this task The following image provides a visual representation of the cable cover removal procedure. Removing and installing - Dell OptiPlex 7780 All In One | OptiPlex 7780 All-In-One Service Manual - Page 18
Steps 1. Unroute the power cable from the slots on the cable cover. 2. Remove the screw (M3x9) that secures the cable cover to the bottom cover. 3. Lift the cable cover from the bottom cover. 18 Removing and installing components - Dell OptiPlex 7780 All In One | OptiPlex 7780 All-In-One Service Manual - Page 19
Installing the cable cover Prerequisites If you are replacing a component, remove the existing component before performing the installation procedure. About this task The following image provides a visual representation of the cable cover installation procedure. Removing and installing components - Dell OptiPlex 7780 All In One | OptiPlex 7780 All-In-One Service Manual - Page 20
on an elevated, clean, and flat surface. It is recommended to remove the stand to avoid accidental damage to the system display during servicing. 2. Remove the stand. 3. Remove the cable cover (optional). About this task The following image provides a visual representation of the back cover removal - Dell OptiPlex 7780 All In One | OptiPlex 7780 All-In-One Service Manual - Page 21
Steps 1. Press and hold the release tab on the back cover to release it from the latch on the system-board shield. 2. Slide the back cover up to release the tabs on the cover from the slots on the middle frame. 3. Lift the back cover and remove it from the system. Removing and installing components - Dell OptiPlex 7780 All In One | OptiPlex 7780 All-In-One Service Manual - Page 22
Installing the back cover Prerequisites If you are replacing a component, remove the existing component before performing the installation procedure. About this task The following image provides a visual representation of the back cover installation procedure. 22 Removing and installing components - Dell OptiPlex 7780 All In One | OptiPlex 7780 All-In-One Service Manual - Page 23
Steps 1. Place the back cover on the middle frame and system-board shield and align the tabs on the back cover with the slots on the middle frame. 2. Slide the back cover to lock the release tab under the latch on the system-board shield. Next steps 1. Install the cable cover (optional). 2. Install - Dell OptiPlex 7780 All In One | OptiPlex 7780 All-In-One Service Manual - Page 24
Steps 1. Press down the tab securing the hard-drive assembly to the system-board shield. 2. Slide and lift the hard-drive assembly from the slot on the display-assembly base. 3. Pry the tabs on hard-drive bracket from its slots on the hard drive. 4. Remove the hard drive from the hard-drive bracket. - Dell OptiPlex 7780 All In One | OptiPlex 7780 All-In-One Service Manual - Page 25
Steps 1. Align the tabs on the hard-drive bracket with the slots on the hard drive. 2. Flex the hard-drive bracket and replace the remaining tabs on the hard-drive bracket with the slots on the hard drive. 3. Place the hard-drive assembly into the slot and slide it to lock the hard-drive assembly on - Dell OptiPlex 7780 All In One | OptiPlex 7780 All-In-One Service Manual - Page 26
Steps 1. Pry and remove the DIMM door from the system-board shield. 2. Using your fingertips, spread apart the securing clips on the memory-module slot until the memory module pops up. 3. Slide and remove the memory module from the memory-module slot. NOTE: Repeat step 2 and 3 if there are two - Dell OptiPlex 7780 All In One | OptiPlex 7780 All-In-One Service Manual - Page 27
Steps 1. Align the notch on the memory module with the tab on the memory-module slot. 2. Slide the memory module firmly into the slot at an angle and press the memory module down until it clicks into place. NOTE: If you do not hear the click, remove the memory module and reinstall it. NOTE: Repeat - Dell OptiPlex 7780 All In One | OptiPlex 7780 All-In-One Service Manual - Page 28
Steps 1. Remove the five screws (M3x5) that secure the system-board shield to the display-assembly base. 2. Lift the system-board shield off the display-assembly base. Installing the system-board shield Prerequisites If you are replacing a component, remove the existing component before performing - Dell OptiPlex 7780 All In One | OptiPlex 7780 All-In-One Service Manual - Page 29
Steps 1. Align the screw holes on the system-board shield with the screw holes on the display-assembly base. 2. Replace the five screws (M3x5) to secure the system-board shield to the display-assembly base. Next steps 1. Install the back cover. 2. Install the cable cover (optional). 3. Install the - Dell OptiPlex 7780 All In One | OptiPlex 7780 All-In-One Service Manual - Page 30
About this task The following image provides a visual representation of the M.2 2230 solid-state drive removal procedure. Steps 1. Remove the screw (M2x2.5) that secures the solid-state drive to the system board. 2. Slide and remove the solid-state drive from the M.2 card slot on the system board. - Dell OptiPlex 7780 All In One | OptiPlex 7780 All-In-One Service Manual - Page 31
Steps 1. Align the notch on the solid-state drive with the tab on the M.2 card slot. 2. Slide the solid-state drive into the M.2 card slot on the system board. 3. Replace the screw (M2x2.5) to secure the solid-state drive to the system board. Next steps 1. Install the system-board shield. 2. Install - Dell OptiPlex 7780 All In One | OptiPlex 7780 All-In-One Service Manual - Page 32
Steps 1. Remove the screw (M2x2.5) that secures the solid-state drive to the system board. 2. Slide and remove the solid-state drive from the M.2 card slot on the system board. Installing the M.2 2280 solid-state drive/Intel Optane memory module Prerequisites CAUTION: Solid-state drives are fragile. - Dell OptiPlex 7780 All In One | OptiPlex 7780 All-In-One Service Manual - Page 33
Steps 1. Align the notch on the solid-state drive with the tab on the M.2 card slot. 2. Slide the solid-state drive into the M.2 card slot on the system board. 3. Replace the screw (M2x2.5) to secure the solid-state drive to the system board. Next steps 1. Install the system-board shield. 2. Install - Dell OptiPlex 7780 All In One | OptiPlex 7780 All-In-One Service Manual - Page 34
Steps 1. Disconnect the system-fan cable from the system board. 2. Remove the three screws (M3x5) that secure the system fan to the display-assembly base. 3. Lift the system fan, along with its cable, off the display-assembly base. Installing the system fan Prerequisites If you are replacing a - Dell OptiPlex 7780 All In One | OptiPlex 7780 All-In-One Service Manual - Page 35
Steps 1. Align the screw holes on the system fan with the screw holes on the display-assembly base. 2. Replace the three screws (M3x5) to secure the system fan to the display-assembly base. 3. Connect the system-fan cable to the connector on the system board. Next steps 1. Install the system-board - Dell OptiPlex 7780 All In One | OptiPlex 7780 All-In-One Service Manual - Page 36
Steps 1. Using the plastic scribe, press on the metal clip to release the coin-cell battery from the coin-cell battery holder. 2. Lift the coin-cell battery from the coin-cell battery holder. Installing the coin-cell battery Prerequisites If you are replacing a component, remove the existing - Dell OptiPlex 7780 All In One | OptiPlex 7780 All-In-One Service Manual - Page 37
Steps With the positive-side facing up, insert the coin-cell battery into the battery holder on the system board and gently press the battery until it snaps into place. Next steps 1. Install the system-board shield. 2. Install the back cover. 3. Install the cable cover (optional). 4. Install the - Dell OptiPlex 7780 All In One | OptiPlex 7780 All-In-One Service Manual - Page 38
Steps 1. Remove the two screws (M2x2.5) that secure the wireless-card shield to the system board. 2. Unroute the antenna cables from the routing guides on the wireless-card shield. 3. Lift the wireless-card shield out of the system. 4. Remove the screw (M2x2.5) that secures the wireless-card bracket - Dell OptiPlex 7780 All In One | OptiPlex 7780 All-In-One Service Manual - Page 39
7. Replace the two screws (M2x2.5) to secure the wireless-card shield to the system board. 8. Route the antenna cables through the routing guides on the wireless-card shield. Next steps 1. Install the system-board shield. 2. Install the back cover. 3. Install the cable cover (optional). 4. Install - Dell OptiPlex 7780 All In One | OptiPlex 7780 All-In-One Service Manual - Page 40
Camera assembly Removing the camera assembly Prerequisites 1. Follow the procedure in Before working inside your computer. 2. Remove the stand. 3. Remove the cable cover (optional). 4. Remove the back cover. 5. Remove the system-board shield. About this task The following image provides a visual - Dell OptiPlex 7780 All In One | OptiPlex 7780 All-In-One Service Manual - Page 41
the middle frame. 2. Replace the two screws (M3x5) to secure the camera assembly to the middle frame. 3. Route the camera cable through the routing guides on the display-assembly base. 4. Connect the camera cable to the system board. 5. Align the screw holes on the camera door with the screw holes - Dell OptiPlex 7780 All In One | OptiPlex 7780 All-In-One Service Manual - Page 42
6. Replace the two screws (M3x5) to secure the camera door to the display-assembly base. Next steps 1. Install the system-board shield. 2. Install the back cover. 3. Install the cable cover (optional). 4. Install the stand. 5. Follow the procedure in After working inside your computer. Bottom cover - Dell OptiPlex 7780 All In One | OptiPlex 7780 All-In-One Service Manual - Page 43
Steps 1. Remove the four screws (M3x5) that secure the bottom cover to the display-assembly base. 2. Lift the bottom cover off the display-assembly base. Installing the bottom cover Prerequisites If you are replacing a component, remove the existing component before performing the installation - Dell OptiPlex 7780 All In One | OptiPlex 7780 All-In-One Service Manual - Page 44
Steps 1. Align the screw holes on the bottom cover with the screw holes on the display-assembly base. 2. Replace the four screws (M3x5) to secure the bottom cover to the display-assembly base. Next steps 1. Install the system-board shield. 2. Install the back cover. 3. Install the cable cover ( - Dell OptiPlex 7780 All In One | OptiPlex 7780 All-In-One Service Manual - Page 45
2. Remove the stand. 3. Remove the cable cover (optional). 4. Remove the back cover. 5. Remove the system-board shield. 6. Remove the bottom cover. About this task The following image provides a visual representation of the PSU removal procedure. Removing and installing components 45 - Dell OptiPlex 7780 All In One | OptiPlex 7780 All-In-One Service Manual - Page 46
-supply socket to the rear-I/O bracket. 2. Slide the power-supply socket out of the rear-I/O bracket. 3. Remove the power-supply cable from the routing guides on the rear-I/O bracket and PSU fan. 4. Disconnect the power-supply cable from the connector on the system board. 5. Remove the screw (M3x5 - Dell OptiPlex 7780 All In One | OptiPlex 7780 All-In-One Service Manual - Page 47
to the display-assembly base. 3. Connect the power-supply cable to the connector on the system board. 4. Route the power-supply cable through the routing guides on the rear-I/O bracket and PSU fan. 5. Align the screw hole on the power-supply socket with the screw hole on the rear-I/O bracket, and - Dell OptiPlex 7780 All In One | OptiPlex 7780 All-In-One Service Manual - Page 48
. About this task The following image provides a visual representation of the PSU fan removal procedure. Steps 1. Remove the power-supply cable from the routing guides on the PSU fan. 2. Disconnect the PSU-fan cable from the system board. 3. Remove the two screws (M3x5) that secure the PSU fan to - Dell OptiPlex 7780 All In One | OptiPlex 7780 All-In-One Service Manual - Page 49
the display-assembly base. 3. Connect the PSU-fan cable to the connector on the system board. 4. Route the power-supply cable through the routing guides on the PSU fan. Next steps 1. Install the bottom cover. 2. Install the system-board shield. 3. Install the back cover. 4. Install the cable cover - Dell OptiPlex 7780 All In One | OptiPlex 7780 All-In-One Service Manual - Page 50
2. Remove the stand. 3. Remove the cable cover (optional). 4. Remove the back cover. 5. Remove the system-board shield. 6. Remove the system fan. About this task The following image provides a visual representation of the heat sink removal procedure. Steps 1. In reverse sequential order (as - Dell OptiPlex 7780 All In One | OptiPlex 7780 All-In-One Service Manual - Page 51
Steps 1. Align the screw holes on the heat sink with the screw holes on the system board and the display-assembly base. 2. In sequential order (as indicated on the heat sink), tighten the five captive screws that secure the heat sink to the system board and display-assembly base. Next steps 1. - Dell OptiPlex 7780 All In One | OptiPlex 7780 All-In-One Service Manual - Page 52
About this task The following image provides a visual representation of the heat sink removal procedure. Steps 1. In reverse sequential order (as indicated on the heat sink), loosen the nine captive screws that secure the heat sink to the system board and the display-assembly base. 2. Slide and - Dell OptiPlex 7780 All In One | OptiPlex 7780 All-In-One Service Manual - Page 53
Steps 1. Align the screw holes on the heat sink with the screw holes on the system board and the display-assembly base. 2. In sequential order (as indicated on the heat sink), tighten the nine captive screws to secure the heat sink to the system board and display-assembly base. Next steps 1. Install - Dell OptiPlex 7780 All In One | OptiPlex 7780 All-In-One Service Manual - Page 54
6. Remove the heat sink. About this task The following image provides a visual representation of the processor removal procedure. Steps 1. Press the release lever down and then push it away from the processor to release it from the securing tab. 2. Extend the release lever completely, and open the - Dell OptiPlex 7780 All In One | OptiPlex 7780 All-In-One Service Manual - Page 55
triangle on the pin-1 corner on the processor socket. When the processor is properly seated, all four corners are aligned at the same height. If one or more corners of the processor are higher than the others, the processor is not seated properly. 2. Align the notches on the processor with the - Dell OptiPlex 7780 All In One | OptiPlex 7780 All-In-One Service Manual - Page 56
Rear-I/O bracket Removing the rear-I/O bracket Prerequisites 1. Follow the procedure in Before working inside your computer. 2. Remove the stand. 3. Remove the cable cover (optional). 4. Remove the back cover. 5. Remove the system-board shield. 6. Remove the bottom cover. About this task The - Dell OptiPlex 7780 All In One | OptiPlex 7780 All-In-One Service Manual - Page 57
Steps 1. Remove the screw (M3x5) that secures the power-supply socket to the rear-I/O bracket. 2. Remove the power-supply cable from the routing guide on the rear-I/O bracket. 3. Slide and remove the power-supply socket away from the rear-I/O bracket. 4. Remove the three screws (M3x5) that secure - Dell OptiPlex 7780 All In One | OptiPlex 7780 All-In-One Service Manual - Page 58
Installing the rear-I/O bracket Prerequisites If you are replacing a component, remove the existing component before performing the installation procedure. About this task The following image provides a visual representation of the rear-I/O bracket installation procedure. 58 Removing and - Dell OptiPlex 7780 All In One | OptiPlex 7780 All-In-One Service Manual - Page 59
to the display-assembly base. 3. Route the power-supply cables through the routing guide on the rear-I/O bracket. 4. Align the screw hole on the power-supply socket computer. NOTE: Your computer's Service Tag is stored in the system board. You must enter the Service Tag in the BIOS setup program - Dell OptiPlex 7780 All In One | OptiPlex 7780 All-In-One Service Manual - Page 60
1. Power-supply unit (PSU) cable connector 2. Display back-light cable connector 3. Camera cable connector 4. M.2 2230/2280 solid-state drive/Intel Optane PCIe connector 5. System-fan cable connector 6. Memory modules 7. LPC debug card connector 8. Hard-drive connector 9. M.2 2230/2280 solid-state - Dell OptiPlex 7780 All In One | OptiPlex 7780 All-In-One Service Manual - Page 61
Steps 1. Disconnect the display back-light cable from the connector on the system board. 2. Disconnect the display cable from the connector on the system board. 3. Disconnect the PSU cable from the connector on the system board. Removing and installing components 61 - Dell OptiPlex 7780 All In One | OptiPlex 7780 All-In-One Service Manual - Page 62
4. Disconnect the PSU fan cable from the connector on the system board. 5. Open the latch and disconnect the power-button board cable from the connector on the system board. 6. Disconnect the speaker cable from the connector on the system board. 7. Disconnect the microphone-module cable from the - Dell OptiPlex 7780 All In One | OptiPlex 7780 All-In-One Service Manual - Page 63
9. M.2 2230/2280 solid-state drive PCIe connector 10. SIO-signal cable connector 11. SIO-power cable connector 12. Audio-board cable connector 13. Microphone-module cable connector 14. Speaker cable connector 15. Coin-cell battery 16. Power-button cable connector 17. Display cable connector 18. M.2 - Dell OptiPlex 7780 All In One | OptiPlex 7780 All-In-One Service Manual - Page 64
Steps 1. Align the screw holes on the system board with the screw holes on the display-assembly base. 2. Replace the nine screws (M3x5) to secure the system board to the display-assembly base. 3. Connect the camera cable to the connector system board. 4. Connect the touchscreen cable to the system - Dell OptiPlex 7780 All In One | OptiPlex 7780 All-In-One Service Manual - Page 65
optional). 14. Install the stand. 15. Follow the procedure in After working inside your computer. NOTE: Your computer's Service Tag is stored in the system board. You must enter the Service Tag in the BIOS setup program after you replace the system board. NOTE: Replacing the system board removes any - Dell OptiPlex 7780 All In One | OptiPlex 7780 All-In-One Service Manual - Page 66
. 2. Remove the nine screws (M3 4+7.1xZN) that secure the speakers to the display-assembly base. 3. Remove the speaker cable from the routing guides on the display-assembly base. 4. Lift the speakers along with the cable off the display-assembly base. Installing the speakers Prerequisites If you are - Dell OptiPlex 7780 All In One | OptiPlex 7780 All-In-One Service Manual - Page 67
base. 2. Replace the nine screws (M3 4+7.1xZN) to secure the speakers to the display-assembly base. 3. Route the speaker cable through the routing guide on display-assembly base and connect the speaker cable to the system board. Next steps 1. Install the rear-I/O bracket. 2. Install the bottom cover - Dell OptiPlex 7780 All In One | OptiPlex 7780 All-In-One Service Manual - Page 68
2. Remove the stand. 3. Remove the cable cover (optional). 4. Remove the back cover. 5. Remove the system-board shield. 6. Remove the bottom cover. 7. Remove the rear-I/O bracket. 8. Remove the speakers. About this task The following image provides a visual representation of the power-button board - Dell OptiPlex 7780 All In One | OptiPlex 7780 All-In-One Service Manual - Page 69
Steps 1. Align and place the power-button board in the slot on the middle frame. 2. Replace the screw (M3x5) to secure the power-button board to the middle frame. 3. Slide the power-button board cable under the antenna cables, then route the power-button board cable to the display-assembly base. 4. - Dell OptiPlex 7780 All In One | OptiPlex 7780 All-In-One Service Manual - Page 70
a visual representation of the microphones removal procedure. Steps 1. Disconnect the microphone cable from the system board, and unroute it from the routing guides on the display-assembly base. 2. Remove the four screws (M2x2.5) that secure the microphone modules to the middle frame. 3. Lift the - Dell OptiPlex 7780 All In One | OptiPlex 7780 All-In-One Service Manual - Page 71
middle frame. 2. Replace the four screws (M2X2.5) to secure the microphone modules to the middle frame. 3. Route the microphone cable through the routing guides on the display-assembly base and connect the microphone cable to the system board. Next steps 1. Install the speakers. 2. Install the rear - Dell OptiPlex 7780 All In One | OptiPlex 7780 All-In-One Service Manual - Page 72
-power cable, and audio-board cable from the system board. 4. Remove the SIO-signal cable, SIO-power cable, and audio-board cable from the routing guides on the display-assembly base. 5. Remove the two screws (M2.5x3.5) that secure the side-I/O board to the display-assembly base. 6. Lift and remove - Dell OptiPlex 7780 All In One | OptiPlex 7780 All-In-One Service Manual - Page 73
.5) to secure the side-I/O board to the display-assembly base. 3. Route the SIO-signal cable, SIO-power cable, and audio-board cable through the routing guides on the display-assembly base. 4. Connect the SIO-signal cable, SIO-power cable, and audio-board cable to the connectors on the system board - Dell OptiPlex 7780 All In One | OptiPlex 7780 All-In-One Service Manual - Page 74
2. Install the rear-I/O bracket. 3. Install the bottom cover. 4. Install the system-board shield. 5. Install the hard drive. 6. Install the back cover. 7. Install the cable cover (optional). 8. Install the stand. 9. Follow the procedure in After working inside your computer. Audio board Removing the - Dell OptiPlex 7780 All In One | OptiPlex 7780 All-In-One Service Manual - Page 75
3. Lift and remove the audio board with the cable off the display-assembly base. Installing the audio board Prerequisites If you are replacing a component, remove the existing component before performing the installation procedure. About this task The following image provides a visual representation - Dell OptiPlex 7780 All In One | OptiPlex 7780 All-In-One Service Manual - Page 76
this task The following image provides a visual representation of the antenna modules removal procedure. Steps 1. Remove the antenna cables from the routing guides on the display-assembly base. 2. Remove the two screws (M2x2.5) that secure the antenna modules to the middle frame. 3. Carefully peel - Dell OptiPlex 7780 All In One | OptiPlex 7780 All-In-One Service Manual - Page 77
frame. 3. Replace the two screws (M2x2.5) to secure the antenna modules to the middle frame. 4. Route the antenna cables through the routing guides on the display-assembly base. Next steps 1. Install the speakers. 2. Install the rear-I/O bracket. 3. Install the bottom cover. 4. Install the wireless - Dell OptiPlex 7780 All In One | OptiPlex 7780 All-In-One Service Manual - Page 78
Display panel Removing the display panel Prerequisites 1. Follow the procedure in Before working inside your computer. 2. Remove the stand. 3. Remove the cable cover (optional). 4. Remove the back cover. 5. Remove the system-board shield. 6. Remove the hard drive. 7. Remove the bottom cover. 8. - Dell OptiPlex 7780 All In One | OptiPlex 7780 All-In-One Service Manual - Page 79
Steps 1. Remove the 12 screws (M3x5) that secure the display panel to the middle frame and display-assembly base. 2. Place the system in an upright position. 3. Holding the top corner, release the display panel away from the middle frame and display-assembly base. 4. Route the display back-light, - Dell OptiPlex 7780 All In One | OptiPlex 7780 All-In-One Service Manual - Page 80
Steps 1. Place the system in an upright position, and slide the display panel on the slots of the display-assembly base. 2. Route the display-backlight, touch screen, and display cable through the slots on the display-assembly base. 3. Place the display-assembly base on a clean and flat surface with - Dell OptiPlex 7780 All In One | OptiPlex 7780 All-In-One Service Manual - Page 81
the screw (M3x5) to secure the display panel to the middle frame and display assembly base. 7. Route the display cable in the routing guides on the display-assembly base. Next steps 1. Install the PSU fan. 2. Install the PSU. 3. Install the system board. 4. Install the camera assembly. 5. Install - Dell OptiPlex 7780 All In One | OptiPlex 7780 All-In-One Service Manual - Page 82
Steps 1. Remove the 16 screws (M3x5) that secure the middle frame to the display-assembly base. 2. Remove the middle frame and lift the middle frame off the display-assembly base. 82 Removing and installing components - Dell OptiPlex 7780 All In One | OptiPlex 7780 All-In-One Service Manual - Page 83
Installing the middle frame Prerequisites If you are replacing a component, remove the existing component before performing the installation procedure. About this task The following image provides a visual representation of the middle frame installation procedure. Removing and installing components - Dell OptiPlex 7780 All In One | OptiPlex 7780 All-In-One Service Manual - Page 84
Steps 1. Slide and align the middle frame to the slots on the display-assembly base, then snap the middle frame into place on the displayassembly base. 2. Replace the 16 screws (M3x5) to secure the middle frame to the display-assembly base. Next steps 1. Install the display panel. 2. Install the - Dell OptiPlex 7780 All In One | OptiPlex 7780 All-In-One Service Manual - Page 85
2. Go to www.dell.com/support. 3. Enter the Service Tag of your computer, and then click Submit. NOTE: If you do not have the Service Tag, use the auto-detect feature or manually browse for your computer model. 4. Click Drivers & downloads. 5. Click the Detect Drivers button. 6. Review and agree to - Dell OptiPlex 7780 All In One | OptiPlex 7780 All-In-One Service Manual - Page 86
: optical drive or hard drive). During the Power-on Self-Test (POST), when the Dell logo appears, you can: • Access System Setup by pressing F2 key • Bring up the one-time boot menu by pressing F12 key. The one-time boot menu displays the devices that you can boot from including the diagnostic - Dell OptiPlex 7780 All In One | OptiPlex 7780 All-In-One Service Manual - Page 87
Manufacture Date Displays the manufacture date of the computer. Ownership Date Displays the ownership date of the computer. Express Service Code Displays the express service code of the computer. Signed Firmware Update is enabled Displays whether the Signed Firmware Update is enabled on your - Dell OptiPlex 7780 All In One | OptiPlex 7780 All-In-One Service Manual - Page 88
Table 3. System setup options-System information menu(continued) General-System Information Maximum Clock Speed Processor L2 Cache Processor L3 Cache HT Capable 64-Bit Technology Device Information SATA-0 M.2 PCIe SSD-0 M.2 PCIe SSD-1 LOM MAC Address Video Controller dGPU Video Controller Video - Dell OptiPlex 7780 All In One | OptiPlex 7780 All-In-One Service Manual - Page 89
or disable booting from USB mass storage devices such as external hard drive, optical drive, and USB drive. By default, the Enable USB Boot Support option is enabled. Enable Rear USB Ports Enable or disable booting from USB mass storage devices connected to rear USB port. By default, the Enable - Dell OptiPlex 7780 All In One | OptiPlex 7780 All-In-One Service Manual - Page 90
disable the BIOS module interface of the optional Absolute Persistence Module service from Absolute Software. By default, the option is enabled. Password is set. By default, the option is not enabled. HDD Protection Support Enable or disable the HDD protection feature. By default, the option is - Dell OptiPlex 7780 All In One | OptiPlex 7780 All-In-One Service Manual - Page 91
, the Enabled in S4 and SS option is enabled. Enable or disable the fan control override feature. By default, the option is disabled. USB Wake Support Enable the USB devices to wake the computer from Standby. By default, the option is enabled. Wake on LAN/WLAN Block Sleep Enable or disable - Dell OptiPlex 7780 All In One | OptiPlex 7780 All-In-One Service Manual - Page 92
option is disabled. Table 12. System setup options-Virtualization Support menu Virtualization Support Virtualization Specify whether a Virtual Machine Monitor (VMM) can Table 14. System setup options-Maintenance menu Maintenance Service Tag Display the system's Service Tag. 92 System setup - Dell OptiPlex 7780 All In One | OptiPlex 7780 All-In-One Service Manual - Page 93
boot flow for SupportAssist System Resolution Console and for the Dell OS Recovery tool. SupportAssist OS Recovery Enable or disable errors. By default, the option is enabled. BIOSConnect Enable or disable the cloud service OS upon absence of local OS recovery. By default, the option is enabled - Dell OptiPlex 7780 All In One | OptiPlex 7780 All-In-One Service Manual - Page 94
space 3. Type the system password that you entered earlier in the Confirm new password field and click OK. 4. Press Esc and a message prompts you NOTE: If you change the System and/or Setup password, re enter the new password when prompted. If you delete the System and Setup password, confirm the - Dell OptiPlex 7780 All In One | OptiPlex 7780 All-In-One Service Manual - Page 95
completed successfully • View error messages that inform you of problems encountered during testing NOTE: Some tests for specific devices code and validation number and contact Dell. Display built-in self test About this task The following procedure provides the instructions on how to run the built- - Dell OptiPlex 7780 All In One | OptiPlex 7780 All-In-One Service Manual - Page 96
board. 2 7 Display failure Flash the latest BIOS version. If problem continues, replace the LCD module. 2 8 LCD power rail failure Replace the system board. 3 1 CMOS battery failure Reset the CMOS battery connection. If problem continues, replace the RTS battery. 96 Troubleshooting - Dell OptiPlex 7780 All In One | OptiPlex 7780 All-In-One Service Manual - Page 97
website to troubleshoot and fix your computer when it fails to boot into their primary operating system due to software or hardware failures. For more information about the Dell SupportAssist OS Recovery, see Dell SupportAssist OS Recovery User's Guide at www.dell.com/ support. Flashing BIOS (USB - Dell OptiPlex 7780 All In One | OptiPlex 7780 All-In-One Service Manual - Page 98
dell.com/support. 3. Click Product support, enter the Service Tag of your computer, and then click Submit. NOTE: If you do not have the Service Tag, use the auto-detect feature or manually the BIOS update file icon and follow the instructions on the screen. WiFi power cycle About this Troubleshooting - Dell OptiPlex 7780 All In One | OptiPlex 7780 All-In-One Service Manual - Page 99
Self-help resources Self-help resources Information about Dell products and services Resource location www.dell.com Tips Contact Support Online help for operating system Troubleshooting information, user manuals, setup instructions, product specifications, technical help blogs, drivers, software
OptiPlex 7780 All-In-One
Service Manual
Regulatory Model: W27C
Regulatory Type: W27C001/W27C002
May 2020
Rev. A00