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U9420 Had Corrosion. Notebook was not powering on after ultrasonic. Powers up no back light. No signs of corresion anywhere else. Pin 1 on connector looks red but soldered on c9000 is reading at 54v
Dont have this lcd im guessing next step order an lcd and try it out? Will a retina 13 lcd work i have those in stock? This is a 15 inch retina but connector looks the same.
At this point you need a known good LCD. This is why you keep a few cracked but working assemblies for testing. Make sure the connector on the board is good before plugging in your good LCD or the cable may burn again.
@Duke Hey been a little busy... Forgot to update so 54v on Pin 1 is no load detected from LED's This was the case as the new Retina display lit up perfectly!