820-2914 No picture

macfix

Member
Hello Everybody

This machine came from no picture problem at display (chime ok) . Someone reflowed or reball GPU. Its looking like generic GPU problem so replaced chip (216-0810005) now LCD backlight is ok but no picture. (LCD back round is black like new macbook s boot screen ) replaced 4 times chip but all time same issue ( also have different data code chips 16 and 12 ) now i think different problem now stopped my brain:( Any idea?

- USB mouse light is not up but i cant be sure its must be this model?
- Chime ok,
- Tried known good LCD and data cables.
- PP3V3_SW_LCD voltage is ok.

Thanks.
 

macfix

Member
Thank you dukefawks replaced all VRAM with same model Hynix memory but nothing change. I think too much time and chip spend for this machine:( I ll send back.
 
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