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Came in heavily corroded. I ultrasonic cleaned and reaplced both bad CD3217 and now computer is turning on. everything is working execpt there is no sound. sound is being detected in system prefs but sound is coming out of speakers. i found a couple of shorts around u6400 so i removed it and...

both are pulsing

pin 7 pules pin 3 pules as well

still 1/4 fan spin on smc bypass no pulse on PLT_RESET_L - 0v

got a 00165 which came in no with only green light. opened it up and it had screw was loose on MLB connected to L1290 which was melted. took the coil off tested both sides to make sure not short and replaced it. it now it has quarter fan spin. im assuming this is gonna be a dead pch but can...

U2800 was heating up after injecting 3V into the into Pin 5/6 on U8295 Replaced U2800 and everything is looking good. Thank you for the help.

Took a second look over the board & noticed u8295 getting hot. Removed the chip and Pin 5&6 were short (PP3v3_s0_left) Used an infrared camera and sent 1.8v through the line and it led to C2991(PP3v3_TBT_X_S0). Removed the Cap but short is still present.

These are the signals I could find test points for - P1V8SUS_PGOOD: 3.3V CPU_VCCST_PWRGD: .04V P5VS4_PGOOD: 3.2V S5_PWRGD is good

L8020: 1.8V L7330: 0V ALL_SYS_PWRGD: 0v

The USB gets power but no communication/activity. None of the big CPU coils get voltage on them L7900: 1.2v L8410: 3.3v L7960: 0.95v L8000: 1.0v PPBUS_G3H: 11.34 PP3v3_sus: 3.29 PP3v3_G3H: 3.3 PP5V_S0: 5.1

CPUCORE_BOOT1: 4.8V CPUCORE_BOOT2: 4.8v CPUCORE_BOOT3: 4.8v CPUCORE_BP1: 4.8v CPUCORE_PHASE1: 0v CPUCORE_PHASE2: 0v CPUCORE_ISNS1_N: 0v CPUCORE_SW1: 0v There is USB Activity I have not tried a known good bios yet

Client brought in a macbook - 820-00928 that wasn't turning on. It takes in 20V .1A- .8A fluctuating on all 4 ports Liquid damage on U3906 area No Voltage on Big coils Cleaned up corrosion Lifted U3906 removed corrosion. With a new known good battery it takes 2-3A - cpu doesnt get hot...

SMC Reball did not work sadly

Pram reset done with 3 chimes Also tried with a new SSD with a fresh OS. SMC is a little dirty underneath, could that be causing an issue? I can reball, if you think its worth a shot.

Pin 1 - 3.327 Pin 2 - .002 Pin 3 - 3.326 Pin 4 - GND Pin 5 - 3.325 Pin 6 - 3.325 Pin 7 - 0.00 Pin 8 - 3.326

TP Connector replaced. Q4800 & R4843 measured good, re-soldered just to make sure. Still stops working.

All TPAD_SPI resistors measured good resistance. Lifted R/Q4860 & resoldered. Still stops working after a couple minutes.

Have a 820-00165-A Board a customer brought in. Track pad will sometimes stop working about 5 minutes after full boot. If it gets past 5 minutes with it working it will stay on until a full restart. Only happens in the first 5 minutes within logging in corrosion on the Track pad cable -...

Knocked off R3990 taking the board out for the clean. Re-soldered the connections and everything looks good. Appreciate the help