820-00165A backlight issue

Image is present, O/P voltage is very inconsistent (I mean fluctuating between 25 and 8.5V) Indeed the backlight also fluctuates, It's not staying a long time for more than 25V.


Staff member
25V is the correct voltage there.
If drops, possibly corrosion under U7701, or surrounding resistors.

Just in case, did you test with known good screen?
I have changed u7701 , still backlight is not staying …
I don’t have a working lcd to test… is there a way I can make sure the current lcd is good?