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Yes, it does. No pulse on LEDs when triggering SMC_ONOFF_L. Yes, there is a pulse drop in PM_PWRBTN_L.

Only the first led lights when you turn on the SMC_ONOFF. There was a short in C9480. I replaced the Q7950, but without result. Voltage: - PP12V_S5 12.07V - PP5V_S5 4.97V - PP3V3_S5 3.30V - PP12V_S0 0V

replaces it, same result. There is no short.

2-16,68V 6 - 0,948 V 3- 6,77 V 4- 0,419 ~ 0,968V

1- 0,11V 2- 16,22V 3- 4,32V 9- 0,33V 12- 3,4V 13- 3,4V 14- 3,38V 15- 0,050V 17- ~0,935V 19- 5,043V 20- 5,031V 27- 0,960V

0,741V

This mac had short C7131, I replaced it but with no result. Replaced Q7130, U7100, AND Q7180. When I removed F7140, there is no voltage on either side. PP3v4_g3h 3,4; PPbus ~0,92V; PPDCIN 16,65V

Why did this happen?

I replaced the SMC, in tests it showed the image, but when I turned the mac off and on again, it didn't turn on again. I would try a Bios, when I applied voltage to the PP3v3_SUS, it was shorted. P1V05S0_LL shows 0.002 Ohm. The PCH gets hot when I apply voltage to PP3v3_SUS

yes, works

LA950 and LA950 get very hot. I replaced the u6300, but it is still without a driver. It seems that there is a GPU defect because it showed a report.

I removed it, the pads are normal.

I have another 820-01700 board with another defect to compare.

There are no signs of oxidation, I checked the thermal camera and it doesn't heat up.

exactly.

No sound driver

This mac came from another service with flux on u7501, Q8150, PCH Done reflow, and other components. Voltage: PPbus_g3h 12.6V; PP5V_S0 4.3V; pp3v3_s0 3.35V; PP3V3_S5 3.35V ;ALL_SYS_PWRGD 51mV, pulsing. The fan rotates in SMC bypass mode. diode mode; L7630 0.088V L7870 0.020V L7330 0.019V...

It still has the same defect, after the macOS installation is finished, the mac crashes the startup bar, shuts down, and speeds up the cooler.

It does not go into SMC bypass mode. Does not switch between GPU's