Dell Inspiron 7791 2n1 Service Manual page 4

Removing the heatsink.................................................................................................................................................. 31
Installing the heatsink....................................................................................................................................................32
Display assembly.................................................................................................................................................................. 33
Removing the display assembly................................................................................................................................... 33
Installing the display assembly......................................................................................................................................36
I/O board.............................................................................................................................................................................. 39
Removing the I/O board...............................................................................................................................................39
Installing the I/O board................................................................................................................................................. 39
System board.......................................................................................................................................................................40
Removing the system board........................................................................................................................................ 40
Installing the system board...........................................................................................................................................42
Keyboard bracket................................................................................................................................................................ 45
Removing the keyboard bracket..................................................................................................................................45
Installing the keyboard bracket.................................................................................................................................... 47
Keyboard...............................................................................................................................................................................48
Removing the keyboard................................................................................................................................................ 48
Installing the keyboard.................................................................................................................................................. 49
Power button with fingerprint reader................................................................................................................................51
Removing the power button with fingerprint reader.................................................................................................51
Installing the power button with fingerprint reader.................................................................................................. 52
Palm-rest and antenna assembly...................................................................................................................................... 53
Removing the palm-rest and antenna assembly....................................................................................................... 53
Installing the palm-rest and antenna assembly..........................................................................................................54
3 Device drivers............................................................................................................................ 55
Downloading the audio driver............................................................................................................................................ 55
Downloading the network driver....................................................................................................................................... 55
Downloading the chipset driver.........................................................................................................................................56
Downloading the media-card reader driver......................................................................................................................56
Downloading the WiFi driver.............................................................................................................................................. 57
Downloading the USB driver.............................................................................................................................................. 57
Downloading the graphics driver.......................................................................................................................................58
4 Troubleshooting......................................................................................................................... 59
Enhanced Pre-Boot System Assessment (ePSA) diagnostics......................................................................................59
Running the ePSA diagnostics.....................................................................................................................................59
System diagnostic lights.....................................................................................................................................................59
Recovering the operating system..................................................................................................................................... 60
Flashing BIOS (USB key)................................................................................................................................................... 60
Flashing the BIOS.................................................................................................................................................................61
WiFi power cycle.................................................................................................................................................................. 61
Flea power release............................................................................................................................................................... 61
5 Getting help and contacting Dell..................................................................................................63
4 Contents