Dell p89f Selek MLK AMD 19802-1

[Zilicon]

Please help

The above system with the board number: 19802-1 powers on, capslock light came on, the screen lights up but no image on the screen.

Please, walk me through on how to resolve this fault.

The full inscription is: selek MLK AMD 19802-1 FGRDN$LA

[SMDFlea]

Re: Dell p89f

Please help

The above system with the board number: 19802-1 powers on, capslock light came on, the screen lights up but no image on the screen.

Please, walk me through on how to resolve this fault.

The full inscription is: selek MLK AMD 19802-1 FGRDN$LA

https://www.badcaps.net/forum/showthread.php?t=88758

Here we will give just a few pointers to what kind of troubleshooting has to be done if you suspect a board issue.

Powers on but no display[LIST][*]Check if it's no backlight, no image or both

• If no image:
  • Check if external display works, try with internal LCD disconnected as well.
  • Measure voltage on LCD power rail(s)
• If no backlight but image is present
  • Try to locate the fuse (or resistor or inductor) to backlight rail and check if it's blown
  • Measure voltage on backlight rail, backlight enable signal, brightness adjustment signal

[*]Check if laptop is POSTing: pressing caps lock key triggers caps lock LED, activity of USB drive blinks when turning on, audio plays, HDD is being read, etc… If it's not POSTing:

• Check RAM compatibility
• Reseat RAM and clean RAM slots
• Measure exact voltage on CPU VCore
• Check CPU Reset signal
• Follow power sequence if it exists in the schematics
• Follow list of power rails if it exists in the schematics

[Zilicon]

Re: Dell p89f

https://www.badcaps.net/forum/showthread.php?t=88758

Here we will give just a few pointers to what kind of troubleshooting has to be done if you suspect a board issue.

Powers on but no display[LIST][*]Check if it's no backlight, no image or both

• If no image:
  • Check if external display works, try with internal LCD disconnected as well.
  • Measure voltage on LCD power rail(s)
• If no backlight but image is present
  • Try to locate the fuse (or resistor or inductor) to backlight rail and check if it's blown
  • Measure voltage on backlight rail, backlight enable signal, brightness adjustment signal

[*]Check if laptop is POSTing: pressing caps lock key triggers caps lock LED, activity of USB drive blinks when turning on, audio plays, HDD is being read, etc… If it's not POSTing:

• Check RAM compatibility
• Reseat RAM and clean RAM slots
• Measure exact voltage on CPU VCore
• Check CPU Reset signal
• Follow power sequence if it exists in the schematics
• Follow list of power rails if it exists in the schematics

Thank you @smdflea

[Chaminda4191]

you can disable the discrete VGA. To do this, remove the following inductors: PL8601, PL8503, PL8504, PL8501, PL8506, PL8505, PL8507, PL8503. Removing these will enable the UMA mode.