[SOLVED]820-4924 - No backlight or picture.

[gcain]

Tiny liquid spill directly on U8330 and R8310.

Replaced both, but no change.

Seems EDP_BLKT_EN becomes unstable once it posts.

 

[aprendiz]

Diode mode on EDP_BLKT_EN?
Have you tried a known good 2015 display assembly?

 

[gcain]

Diode mode on EDP_BLKT_EN?
Have you tried a known good 2015 display assembly?

Yes, known good display.

EDP_BKLT_EN in diode is 0.519V

 

[aprendiz]

Voltage on pin 30 from J8300??

 

[gcain]

J8300::30 = 5v

 

[Gurmon]

So screen is getting power.

what's voltage on Pin 1?

 

[gcain]

7mV. Probably a bit low.

 

[gcain]

If I press hard on U8330 I get a backlight but no picture. Will try resolder it and see.

 

[gcain]

Resoldered U8330 and we get picture!

Mark solved please.