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PPBUS_G3H?? For future reference, does boot chime imply this?? So it looks like the keyboard was shorted and making it restart. Now to solve other issues.

820-3462 Liquid Damage - High fan > Boot Chime > Shutdown Once charger in plugged in, immediate high fan seconds later boot chime then 3-4 seconds later shutdown. No Green light. Where to start on this one? Thanks.

IMO, starting a repair biz in 2017 would be like starting a movie rental store a year before blockbuster went bust. If you haven't had a store already, you haven't experienced sharp drop off of certain models of Macs. One day very soon you will no longer see a pre 2012 Macs which has been the...

Changed U4850 with used chip from donor with clean J4813 area, pretty sure it's good by don't know how to tell. Used 2x different new keyboards Liquid Damage near J4813 both sides Ran thru UC Repaired pin4 of J4813 (PP3V42_G3H) What seemed like a simple quick fix is driving me nuts. :|

Duke, board was missing r5071 and bad c4906. Against my hunches I changed U9701 for nothing, thank you for teaching me the order of operations. Very grateful for your assistance.

No change to BKL_PWM / 0v RTG @ pin2 of R9704 BKL_PWM = .5v BKL_EN = 3v @ pin2 of R9715

I would have been quite embarrassed if it was indeed that simple after replacing U9701 with the same outcome, however PRAM reset didn't help. Still no Backlight. Thank you very much for your assistance. It's great to have a resource such as yourself as these challenges can make you a tad MENTAL.

No Backlight Flashing Folder U9701 Changed 21+22 of J9000 PPVOUT_SW_LCDBKLT starts @ ~20v and falls to steady 12.54v in just about the same time flashing folder appears RTG at this point .567v 0.0v BLK_PWM 3.29v on pin 5 of q9707 LCD_BKLT_EN Any assistance would be appreciated. Thank you.

not ISL6259 :(

pin 5 of J7050 SMBUS_SMC_5_G3_SCL .4v pin 6 of J7050 SMBUS_SMC_5_G3_SDA 3.4v / .2v with no batt connected tested with 3 batteries SMC very clean and LD not near there. has been through UC

Board runs well but will not recognize / charge battery. All zeros in system profiler, yet when charger is removed it manages to successfully go to sleep from battery power. I feel I'm close but obviously missing key things. Please see my marked up image to see all that has been tested. Both...