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Customer backed out of this repair. So I guess I will never know if this could have been fixed. Thanks for all the help.

0 v at CPU v core. GPU vcore stuck at 1.1 volt

Replaced U8900 and now have 1.1V on GPU Vcore. So if I get CPU_VCore back then it should POST and turn to .9V? Thanks

resistance to ground at L8920 - 10.6Ohm u8900 16 - 4.43V 22 - 4.94V 14 - 12.58V 29 - 3.296V Thanks Should I try replacing U8900 and Fets?

I have previously replaced 7400 and R7402. VCC - 4.92V VDD A/B - 4.95V TON - .543V EN - 2.606V R7402 - 90k Thanks

Im sorry I thought you just meant CPU stuff. L7630 - 1.057V L7220 - 4.98V L9560 - 1.509V L9510 - 1.021V L7330 - 1.502V Thanks.

Hi, 0V on coils including L7100. ALL_SYS_PRGD = 2.610V Thanks!

Board had damage had minor damage around U6900. Came with no fan spin and no green light. Regained green light and fan spin but now have no GPUVCORE and also missing CPUVORE. I have already told customer about possible GPU problems in the future but they insist to try to repair. Im not great...

I guess so. Hey , thanks 2informaticos for all your help walking me through it, even though it didn't work. I appreciate it, take care.

Hi - Got PCH_INTRUDER_L up to 2.490V, still nothing. The voltage isn't steady. Sometimes when I take the measurement it goes to 2.8V sometime 2.2V. Either way no fan spin. Thanks man. Have a good one.

PCH_INTRUDER_L - (1.9V to 2.1V) Though R1301 looked fine and measured correctly, I replaced anyway, now getting 2.2V PPVCC_S0_CPU pulses when I first plug in the charger. Tried the flux under board with no success Since you led me to PCH_INTRUDER_L I noticed that the TP next to the CPU\PCH...

PM_SLP_S4_L pulses .907V when SMC_ONOFF_L is triggered. RTC_RESET_L - 3.250V PCH_SRTCRST_L - 3.250V PCH_INTVRMEN - 2.760V PCH_INTRUDER_L - 1.85V - 1.89V This board powered up for me when I first came in this morning. Now it wont of course. Thank you.

Ok, thanks.

No change with different charger unfortunately... New measurements - SMC_ADAPTER_EN 3.412V PM_BATLOW_L - 3.315V PM_RSMRST_L - Fluctuates - 3.12 - 3.14V PM_PWRBTN_L - 3.408v, goes down to 0.353V when SMC_ ONOFF_L is triggered. PM_DSW_PWRGD - 3.412V PCH_DSWVRMEN - fluctuates between 2.3V and...

Update with 60W Genuine charger - PM_BATLOW_L stays between 2.298v and 3.301v I was using a genuine 85W Apple charger. My mistake, sorry. Take care.

SMC_ADAPTER_EN 3.412V PM_BATLOW_L - 0.036V PM_RSMRST_L - fluctuates 3.1v - 3.2v PM_PWRBTN_L - 3.407v, goes down to 0.357v when SMC_ ONOFF_L is triggered. Have a great night.

Yes on ISL, sorry. OK, thanks.

I was able to turn on once in what I think was SMC Bypass by holding power down for 10 secs then releasing and hitting power again. (It was no chime and no light on mouse) got fan spin and 1.8v on vcore. I have not been able to get it to turn on again. This being a 2015, does need to have...

Damage around U7100. Area repaired. PBUS G3H - 8.56 PP3V42- 3.42V PP5v_S5 - 5V PP3v3_S5 - 3.3V PPRTC - 3.324 PP5V_S4RS3 - 0 PP3V3_S4 - 0V PP3V3_SUS - 3.3v PP3V3_S3 - 0.009V U7501 PIN 4 PP5VS4RS3_EN missing .427 in diode PP5VS4RS3 Thanks for any help.

There happened to be a slight crack on pin 1 side of L7701. No sure how that would cause BKLT_PWM to be low, but it works. Thanks, have a good one.