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820-01700 No Image (Internal & External)

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Hello, I got a 820-01700 A2141 Macbook Pro in with extensive liquid damage and prior repair attempt. Initial issue was no power which I have now resolved. I get full boot sequencing it seems and I assume it gets to a login screen for the reasons listed below. Currently though, it does not output anything to either the internal or external display.

  • Caps light comes on when toggled
  • USB activity lights on my test USB drives
  • Can enter DFU and target disk mode
    • DFU fails revive with general error
  • Macbook will sleep properly when closing the lid (fans stop spinning after a second then resume when opened.
Any suggestions on what I should check or is this just a dead GPU here? Thanks!
 
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2informaticos said:
Did you test external video disconnecting internal LCD?

Check diode mode to ground on pins 1 & 3 of J8500.
Click to expand...
I will have to check later when I am back with the laptop. I checked it previously and I think it was in the range of 0.6-0.8~ but ill have to get an exact measure later. Is there anything else I should check just so I can get as much information back to you as possible? Thanks for the reply!
 
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2informaticos said:
Do you still get Caps Lock reaction after failed DFU revive?

What is the exact voltage for CPU and GPU cores?
Click to expand...
Yes caps lock responds after failed DFU. Customer wanted to pick up and was fine with data recovery since I could get it into target disk mode. I did notice the GPU coils all had 0v at the end but they already picked up. Thanks for the help though!
 
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