820-00850 No Image On Internal Screen

brunomotter

Member
Hello. Got this board with coffee spill. Lots of coffee got inside the screen connector on screen side. The board turns on, generates external display but no internal display activity. I cannot tell if there's no image or no backlight, but I think it has no image. Where should I start? Already cleaned up the mess and replaced EDP cable and tried with known good display, but same result.
 
Liquid damage on LCD connector damaged the CPU, so its most likely not fixable without replacing the CPU. You can check diode mode on EDP_INT_AUX_N to see if it is shorted. Most likely is, because that is the pin that is right next to the LCD backlight
 

2informaticos

Administrator
Staff member
This is a classic damage, which place the machine out of warranty.
Apple did the best (for its business) placing a data line next to 50V rail.
 

2informaticos

Administrator
Staff member
iGPU has different outputs for internal/external video.
The iGPU core is still good, but eDP output (for internal LCD) is damaged.
 
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