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820-00281 board was liquid damaged. Corrosion around U7650 and U6400. Would not power on. Replaced a few damaged components around U7650 fixed the power problem. Now no audio through speakers. Audio through headphone jack works. U6400 had corrosion underneath it. Replaced U6400, problem...

Late 2013 13" 3476 board, backlight goes dim (can see video on LCD with flashlight) after 1-4 hours. Sometimes works fine for days on end. No sign of liquid damage. Thoughts? I really don't want this thing on the bench for days on end.

820-2849 no sign of liquid damage. Powers cycles on and off for about a 1/2 second, during that time fan spins and all rails appear to be present. Not much experience working on this board, I'm starting to think GPU is toast. Any thoughts? Thanks

820-4924 Liquid damaged. Replaced a few corroded caps and resistors, replaced burned LCD connector and LCD cable. Had no video internal or external, replaced U8300. Everything working fine now except screen is black with backlight on and about 1" of faint vertical lines when waking from sleep...

Backlight works, get video to an external monitor, LCD just lights up black. No sign of liquid damage anywhere. Not had one of these with this problem before. Poked around schematic a bit, not sure where to start.

Late 2013 27" iMac. No backlight, definitely has image on LCD. Checked pins 1-4, 2-5 and 3-6 on BKL connector, no voltage at all. Can't find a schematic for this board anywhere. Replaced LCD cable and reset PRAM, no change. Grateful for any help on this.

Customer installed second drive in this 2012 Mac Mini Server. Said a metal clip near power supply came loose and touched the board. Now it powers on, no chime no video. Wondering if anyone has any ideas as I cannot locate a schematic anywhere.

661-6071 had very small amount of liqiud residue. Board seemed unaffected and works after cleaning except wifi is extremely slow. Replacing wifi card has no effect. Any thoughts on what might be causing this?

Hi everyone, I'm stumped here. Liquid damage around U7330 and battery connector. Replaced corroded capacitors around U7330, got the board to power on then will not enter S4. Then noticed area between Q7155 and battery connector very hot. PPVBAT_G3H_CONN shorted to ground. Removed Q7155, no...