820-01814 no image

[bartech]

lcd connected
chime but no image
3V3_S0SW_LCD - 0v
DP_INT_HPD-0v

 

[2informaticos]

Any history available?
Tested with known good screen?

What about U8500/1 voltages?
Any of them pulsing at least?

 

[bartech]

u8500
1,3,4-5,14
2-0
5,6-0
7-0

u8501
1,3,4-0
2-0
5,6-0
7-0

 

[bartech]

at the begginig was working, i repair dust gate and the screen was flickerig a little like it is sometimes on begginig after repair that, after some time just stop giving video at all.

 

[2informaticos]

"u8501
1,3-0"
Broken trace?
Fix the problem there...

 

[bartech]

sorry
again

u8500
1,3,4-5,14
2-0
5,6-0
7-0

u8501
1,3,4-3,3v
2-0
5,6-0
7-0

 

[2informaticos]

Did you check these voltages with LCD connected?

 

[bartech]

yes, i check today whit other lcd connected and check all again. The same voltage

 

[2informaticos]

You should get at least a pulse on 3V3_S0SW_LCD, in the first seconds.
DP_INT_HPD should pulse at same time.
If not, PCH will think there is no LCD connected.