Macbook Pro Retina 820-3787 black screen, then white

arnonabuurs

New member
Hi Guys, I have a 820-3787, black display and I cannot find the issue all voltage seems there. Found some resistor off value near U7701, I replace the R and also U7701. After that, backlight on but I get a complete white display. All LED returns have correct value all voltages present 3.3v and 44v. Seems some data issue? Tried display in another Mac and it works fine so must be logicboard issue. Also changed LVDS connector.
 

2informaticos

Moderator
Staff member
Do you get USB activity?
Is that pure white, or greyed?
External video OK?

Check all small coils FL8300-03 and pull-down resstors R831x.
Compare diode mode readings on data lines with similar board.
 

arnonabuurs

New member
Hello,

Yes mouse red light turns on
I would say pretty white yes, not grey
External display gives us the same white screen, so it looks like a GPU issue :(

Check all small coils FL8300-03 and pull-down resstors R831x. = same as good board
Compare diode mode readings on data lines with similar board. = all good
 

2informaticos

Moderator
Staff member
If you get same issue on external monitor, LCD connector area is OK then.
You have GPU issue in this case; heat it for test, at least.
 
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