820-00840 no backlight

Kyle93

Active member
Arrived with liquid damage but at the time was still working. After cleaning up and replacing liquid damage components in U8400 area backlight is now gone. 0V on BKLT_EN_R.

Chimes and image appears on screen.

All traces appear to be fine. Replaced u8400 twice but no change. Really lost on this one.
 
Last edited:

2informaticos

Administrator
Staff member
Check voltage and diode mode to ground on BKLT_SCL/SDA lines.
Be sure all R8450-53 are good, as their solders and traces too.
 
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