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Most likely a corrupted rom, you might get away by removing the serial number and then flashing it back with BBS. Duke most probably knows what to do

You're probably missing SMC_PM_G2_EN Voltage of SMC_PM_G2_EN and SMC_BC_ACOK? I can't find R1517 on my schematic by the way

No experience with this issue other then cable or trackpad issues. Maybe the USB traces are bad and the device gets disconnected due to too many failed transmissions. Does it also show this issue when booting into OS X Recovery? Will the trackpad and keyboard keep working in the boot drive...

Replace R7005 and R7051/52 and see if that fixes your issue

There is a fair chance the CPU is toast, if you have time for it you can try to hunt down which mosfet is shorting and replace accordingly, I've had about a 20% success rate on CPU mosfet PPBUS shorts where the CPU was not killed

Mind posting what fixed this? It might help the next person

This means you have one or more sensors failing so the SMC is running the CPU in low speed while blasting the fans on full. What does ASD tell you about the sensors? Just wondering. EDIT: Check duke's response You indeed need to get a SMC from a exact identical board

Check what the battery reports with CoconutBattery for OS X or a test with ASD if the model you have has one. Maybe the internal diagnostic test will report a back battery as well but I'm not 100% sure. (You can run CoconutBattery on a Guest Account by opening it from the Terminal if you don't...

Display connectors often go bad while looking pristine after being hit by liquid, I'd say give it a try

PP5V_S3 will be there but only for a split second until it power cycles again. Could very well be possible that your multimeter does not catch this If the fan spins even for a split second it means you had ALL_SYS_PWRGD. If you really believe there is no PP5V_S3, what is the resistance to...

Just my phone! Its a Xiaomi Mix but with the ported Google Camera APK.

No Title Had this amazing one in today, Its was shooting 16V straight into PPBUS_G3H Surprisingly enough none of the datalines were shorted in a way it killed the SMC's sensors, so a new ISL and everything is up and running again.

Wrong topic :)

It should see a stable 5V to power the display's circuitry, follow dukes advice

This has nothing to do with PP1V5_S3RS0_CPUDDR, by removing this resistor to Q7950 the system will never make ALL_SYS_PWRGD good high resulting in the system never completing its power sequencing Basically (with R7974 on the board) you will get ALL_SYS_PWRGD but the system is power cycling...

Resistance of PPDCIN_G3H_CHGR to CHGR_PHASE in Ohms? Voltage of CHGR_UGATE? You probably have a dead Q7030 and this may have killed the new ISL again as well

Dead ISL then with possible dead Q7030/35 like duke said. Lets us know how it works after replacing the ISL

$800 is cheap for a good Ultrasonic cleaner. You need one that can properly heat and have a sweep frequency. Just brush corrosion away manually if you don't want to pay it, but don't break boards with bad cleaners. Personally I always just brush manually, the only reason why I would get a...

Try to login onto the computer and set the brightness to full, at least that way we know for sure it isn't simply turned off. I recommend just asking the customer for the EFI lock though so we can do a full PRAM reset....

Took a bit longer then planned due unexpected sickness. Anyways U4600 actually has a small hole inside of it and PP5V_S4_EXTA_ILIM was semi-shorted with only 16Ohms to ground. And PP5V_S4 went from 10.4Ohms to ground to >15kOhm Not surprised this can cause some issues :) Its currently running...