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I'm working on an 820-3482 board but can't find the schematic anywhere. Does anyone know if any of the older iMac 21.5 boards are close enough? I mainly work on macbook pros and it seems the schematics don't change too much from year to year (just the board views). thanks, Paul

820-3115 stuck in 1 second fan spin loop. Multiple places with corrosion, cleaned well with ultrasonic. Replaced u5400 and ran wires reconnecting it to R5400. Another bad trace between Q5490 and r5494 fixed pm_slp_s3_l is toggling on and off and I traced it to multiple places on the board...

Greetings, I have an 820-2936 with no signs of water damage on either side of board. Boots fine with good video but will not recognize keyboard, trackpad, or drive. All voltages good on KB connector SMC_ONOFF__L signal is High (not sure if that is good or bad) power to USB ports, makes a...

[SOLVED] 820-3115 full boot on ac, charges and recognizes battery but will not run on battery Greetings. I have an 820-3115 board works fully on adapter, sees and charges battery. With battery plugged in and fully charged, disconnecting AC kills machine. When starting only on battery, get a...

Greetings - working on an 820-2879. Boots fine but locks up after running for 5 or 10 minutes. Getting AHT error macbook 4sns/1/40000001:tn1d--1.000. My best research shows is it's a cpu heat sensor. I checked around U5515 and also Q5501 but no damage anywhere. I was going to change these...

820-2879 with no fan spin. All S5 rails present and charges battery. When attempt to turn on by shorting pins, light turns from amber to green and then back to amber. Something tells me there's a short but not sure how to proceed.

Greetings. I'm having this similar issue with multiple boards and I always end up chasing my tail - so wanted to start fresh before I started replacing stuff. When the board is connected to AC only, PPBUS_G3H measures 12.4v but then starts decreasing by about 1 volt per second. No issue once...

Greetings. I'm working on a 820-2879 with a spinning fan, no video, no chime/post. There are 5 pads between u6990 and u7600 that are very slightly red, other than that I can find no evidence of any water damage. I checked a few voltages related to the CPU in case that was the issue and...

Greetings. I have an 820-2879 board with high fan. Diagnostics showed no bad sensor and system also does not show any slow down. All seems to work well otherwise. All measures well around fan connector (R5660, R5661, R6556). I replaced Q5660 just to cover my bases. I replaced trackpad also...