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Yes, PM_SLP_S3_L has 3.3V. Laptop starts, fan spin. Q5300 needs to be taken care of. How did you find out that something related to PM_SLP_S3_R_L could be bad?

Okay, removed Q5300, PM_SLP_S3_L seems normal now. (0.462). Can I start without Q5300? I doubt since it's PBUS Voltage Sensor?

Sorry, wrong information. Just got the board in front. It actually doesn't show picture when starting, but it does when lid is closed and opened a couple of times, while Thunderbolt is connected.

I?m not sure what customer uses. I do have 85W. I only have board and display for this one. I guess SMC_LID won?t work without housing or I could use a magnet somewhere?

This board has problems when external Display is hooked up to Thunderbolt port. Internal and external displays stay black until you close and open the lid a few times. Then they both work properly.

R7978 pin 1 (2.28V) pin 2 (0.062V)

Okay, so I've removed and replaced U7100 and U7600 and PP5V_S0 is back to normal 0.360. I'm drawing 44mA from DCPS. PP5V_S0 not present though. I have lower resistance in Ohms on CPU compared to known good (10 vs 17 Ohms). PM_SLP_S3_L - 2.26V PM_SLP_S3_L - 0.038

Replaced U7200 and Q7221. PP5V_S3 is present now. I seem to have S3 rails now, but not S0. PP5V_S0 - 0.033 resistance Am I safe if I inject more than 1V into the line since it feeds some 1V lines?

No pulse on L7260

U7200 area looks good. Red on ground: 0.121 Black on ground: 1.070

Q7221 now removed & pad voltages: pin 1 - GND pin 2 - 3.45V pin 3 - 0.74V pin 4 - GND pin 5 - 0V pin 6 - 0.9V U7200 voltages: pin 16 - 12.59V pin 13 - 3.42V pin 3 - 2V pin 8 - 3.3V pin 17 - 5V pin 1 - 0.9V R7260 pin 1 (0.568) pin 2 (0.568) C7260 pin 1 (0.568) pin 2 (0.118) R7267 pin 1 (0.118)...

Well, that wasn't the case here. No 5V coming from U7200 with Q7221 removed.

"Why would you want to have voltage on an active low enable signal?" It was present on pin 2 Q7221 P5VS3_EN_L, but only because it's connected to PP3V42, right? Yes, I have 0V now.

When Q7221 was removed, I didn't have any voltage on pin 5 P3V3S5_EN_L. Q7221 is back now. Laptop doesn't start with battery and charger plugged in. Battery voltage without charger is 11.5V. When I use it on DCPS with original charger head, laptop draws 20mA.

Yes. I have tried original charger. No voltage on PM_SLP_SUS_L and 3V3_SUS.

Q7221 removed. PP3V42, PPBUS, PP5V_S5 present. SMC_ADAPTER_EN 0V PM_BATLOW_L 0V

I don't understand. I measured diode mode 20 seconds after power was removed and DMM shows 0.110V. There is no voltage on 5V_S3. Barely goes from 0V to 0.02 and back. 3V3_S3 cycles though.

I've injected 1V, nothing. Probably should go more?

I just wanted to edit post above to say clearly that resistance is not measured with power applied. I didn't inject voltage with charger plugged in. So, charger connected, board doesn't start. I unplug it, check resistance (10 Ohms and goes slowly to 6 kOhms). Okay, should be good, thinking to...

After unplugging charger, shows 10 Ohms then goes to more than 6 kOhms. As soon as charger connected, resistance drops to very low like 10 Ohms.