820-01814 liquid damage - Powers on with no display

nik1981

Member
Liquid damage around J5100 and some on the LCD connector on the screen end.

Removed J8500 ribbon as that was burnt at the screen end. Replaced the ribbon.
( PP5V_S0SW_LCD pin was burnt at screen end ) No short on this line.

Cleaned area around J5100, connected board to a good lcd to test.

Board powers on (PPBUS_HS_CPU 12v), fans spin, no chime, no caps led, does have power and activity on USB. No display, no backlight.

PP3V3_S0SW_LCD 0v
DFR_LID_OPEN_L 0v

I'm a little stuck now
 

nik1981

Member
There is no external display. The board seems to power on with fans spinning at a normal speed for 10 seconds and then the fans burst to 100% for 2 seconds before restarting the cycle.

The J8500 reading from S-UEM2 shows pins 31, 33, 37, 38, 39, 40 all slightly high. I've attached a photo
 

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