820-01700 No Image (Internal & External)

[Isolated]

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!

 

[2informaticos]

Did you test external video disconnecting internal LCD?

Check diode mode to ground on pins 1 & 3 of J8500.

 

[Isolated]

Did you test external video disconnecting internal LCD?

Check diode mode to ground on pins 1 & 3 of J8500.

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!