820-00923 no internal image. External OK

[BCN_Techs]

Hi,

Board has no water damage, no kick compomonents i can see, just stoped working internal display. Tried good know LCD panel and still not working. External monitor is ok, all other functions of MBP are ok too.
What it can be?



P.S:
U8510, U8500 and U8501 supplies seems to be ok.


DEAD CPU for internal image?

 

[2informaticos]

Check diode mode to ground on EDP_INT_ lines.
Compare with good board, if possible.

 

[BCN_Techs]

All EDP_INT lines are about 0.330-0.350. Actually i have no board to check it. Checked same lines on A2251 and the value is 0.450.

 

[2informaticos]

DP_INT_HPD steady high?