820 4924 - No backlight

[Noguinfor]

hello,

Working on 820 4924 with no backlight! i have found C7773 shorted and F7700 broken!

Already replace the driver U7700 but same history!

i noticed on pin1 PPVOUT_S0_BKLT = 12.3V and i have the 5.1V on L8300 when start!

an suggestion ? thanks

 

[2informaticos]

Any history available, liquid sign?
Did you try known good compatible screen assembly?

Be sure D7710 is not shorted.
You can also try new U7700.