A1502 820-4924 with weird graphics / display issues

[guzq]

Hey Guys,

Working on 820-4924 with weird graphics / display issues. Graphics working well until login screen, after put password and login to desktop screen suddenly goes mosaic.

Plugging HDMI or DP to external monitor screen works normally and also recognizes the internal screen, when plugged off mosaic comes again.

Board pretty clean, no visual liquid damage.

Diode mode readings:
C8320 = 0.295
C8321 = 0.296
C8322 = 0.301
C8323 = 0.297
C8324 = 0.297
C8325 = 0.296
C8326 = 0.299
C8327 = 0.300
C8328 = 0.299
C8329 = 0.297

 

[2informaticos]

There is no dedicated graphics.
Could be RAM, or CPU issue.
Do 2-3 times PRAM reset.
Next, try another LCD...

 

[guzq]

Replacing LCD fix the issue.

Mr. Admin can mark this as solved.
Thanks