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i have this board 820-3478 (clean), only 1 led with iMac supply.
I use an external power supply, I inject 12V on PP12V_ACDC, the current is 0,77A
I think it's too much, I have U2800 is very hot, PP1V05_TBTLC=0,3V, I suspect U2800. PP3V3_TBTLC=3,3V.
have you an idea?
sorry no I have 3,3V on pin 9 and 0V on pin 10.
I check that for the pin 10:
PM_EN_REG_GPU_VDDQ_S0 = 3,3V
PM_PGOOD_REG_FBVDDQ_S0 = PM_PGOOD_REG_FBVDDQ_S0 = 0V
I change U7750 but always same