A1278 820-3115-B no image

[hgoncalves]

Hello, I have an A1278 820-3115-B with no image (just a white screen), and i got 0V in LCD_IG_PWR_EN (pin 1 on U900), with the LCD connected. I have tried with other LCD with the same result. The LCD connector seems to be ok.
L9004 not shorted and is 0.39 ohm
It works fine with an external LCD.
Can anyone help me?

 

[2informaticos]

Post diode mode to ground at LCD_IG_PWR_EN.
Try changing U9000.

 

[hgoncalves]

Hello,
Diodo reading on LCD_IG_PWR_EN is 600mV. After replacing U9000 the results are the same.

 

[2informaticos]

Then you have a problem with the PCH.
Try PRAM reset 2-3 times, just in case.