820-00850 No video. Boots normally

[bjf]

This board had a blown LCD connector from some pretty minor liquid-damage. The backlight pin was black. Replaced the LCD connector. Board boots normally but has no internal video. Screen is known-good with other board. The internal screen is not recognized in System Preferences under Displays. It only registers the external monitor. Any idea what might have gotten hit to cause something like this?

 

[JohnB8812]

If this is anything like the years previous, 50 volts went to the CPU and this can rest in peace...

 

[bjf]

You think the CPU would be bad even though the computer is booting normally?

 

[2informaticos]

Overvoltage on EDP_INT_AUX_N line, which goes directly to CPU.
Machine can be used as iMac only now...