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I get the chime and then loops and chimes again. Amp Meter is constant at 20V. Only the amps drop and rise accordingly.

Update. With Tracpad connected I get the apple logo and loading bar till like 25% and then it turns off and loops and does the same thing. With trackpad disconnected it boots up completely. Checking with a 85W adapter and no battery

SMC_BC_ACOK is 3.4V SYS_ONEWIRE is 3.1V R7100 is 3.4V on both pins. Replaced U7100. Still the same

DCINVSENS_EN_L IS 0V PPDCINVSENS_EN_L_DIV is 8.4V PPDCIN_G3 is 17V DCIN_S5_VSENSE is 17V SMC_BC_ACOK is 0V

Tried. Its the same

R5311/2 is 100k Ohms Q5310 Diode Readings all are ok except PPDCIN_G3H is 2.923 - PPDCINVSENS_EN_L_DIV is OL is it normal?

Did that. I am suspecting that it is a SMC issue. facing similar issue with 2 devices right now. Maybe this lot of SMC is faulty?

I tried with a different set of LIO board and Flex cable. its the same. PPBUS is 8.2V

SCL/SDa are 0.540 diode mode readings Voltage with and without battery connected is 3.4V

I forgot to mention that the machine turns on and boots into the OS. Doesn't detect battery but runs on battery. - after replacing the SMC. PP3v42 is 3.4V PPBUS is 8.2V with Battery connected SYS_DETECT_L is 0.2V Diagnostics Error - PFM001 SMC NDC001 Camera ( But Camera Works) VDH002 and...

Diode Readings SMC_DCIN_VSENSE is 0.709 SMC_PBUS_VSENSE is 0.740 SMC_DCIN_ISENSE is 0.740 SMC_BMON_ISENSE is 0.743 Voltage Readings SMC_DCIN_VSENSE is 2.8V Stable SMC_PBUS_VSENSE is 0V SMC_DCIN_ISENSE is 0V SMC_BMON_ISENSE is 0V

820-00165 PPBUS was at 8.2V. I replaced the SMC. still PPBUS at 8.2V with fan spin high. No MagSafe light

It is turning on in SMC bypass mode. was doing it wrong. Bad SMC ?

there was some moisture under the SMC. I replaced the SMC. Fan always high. no MagSafe light. no battery being detected in settings. I assumed smh was from a different model. so I went ahead and flashed it as well. still the same. SYS_DETECT_L on diode mode readings is 2.7. As soon as I plug in...

Device is dead. If I disconnect the trackpad flex. J8401. Machine turns on. Tried with another trackpad as well. Still the same.

R7402 across pins 90k Ohms Yes all voltages on the board are pulsing.

SMC doesn't work.

Taking 800 amps and pulsing. Fan spin. Green Light on MagSafe. How to go about this ?

So I tried with opening the back panel and a fan fully blown to keep it cool. the device didn't heat up but still shut down.

Device came in with Question mark . It goes into internet recovery and I am able to format and go for re installing the MacOS. but the device heats up and shuts down. No dirt or corrosion on the board. Please help. Tried DFU Restore/Revive