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i have the 5V, why do you tell me about 5V. I think it's the GPU because he heat when I inject a small current (1V 0,8A)

L7710 = 0,0084V in diode mode, i compare with another same board (0,450V). can I inject power? to find short? how can I do? pins 19/20 of U7750 are OK (0,5V in diode mode)

No I have 0V Diode mode 0,0084V, short?

Hi, 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 PP5V_S0_REG_FBVDDQ=5V I change U7750 but always same

PM_PGOOD_REG_GPU_VDDQ_S0 (pin 10) = 3,3V PM_PGOOD_FET_REG_P1V5_S0 = 3,3V PM_EN_REG_P1V05_S0_R = 0V I try to find why PM_PGOOD_REG_GPU_VDDQ_S0 at 0. I check that, I change U7700 but always same: PP1V5R1V35_S0_GPU_REG = 0V PM_EN_REG_GPU_VDDQ_S0 = 3,3V PP5V_S0_REG_FBVDDQ=5V

I try different memory, I forgot to tell you.

Hi, i have this board clean, make that on external and internal display. How can make that? Image thanks Best regards

hi, Q8470 is good, I have 12V_S5. and 8470 too. PP3V42_G3H=3,41V, S3,S4,S5 is OK. I have PM_EN_REG_P1V05_S0=0V why? need the real iMac power supply? thanks

Yes I inject by J6900, I have the 1st led too on PSU. I check the Q8450/70 later.

Hi, 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?

i use an original charger 96W, and i wait the original of my customer. is it normal? it's a long wait to change 5v -> 20V

Hi, i contact you for this mac, the board is very clean. The mac no charge (the tester stay black, no power) i find D3300 and D3400 short, i change it and after it work well. i think it's good but, the customer come back, D3400 is short again. i find the mac is very slow for change 5V to 20V...

Ok i changed the SMC now the signal SMC_RESET_L is always good. the mac work well. Thanks for your help

no the connector is very clean (under microscope in and out). Do you think remove connector is useful if it is clean?

I change U5110 and R5100, sometimes the SMC_RESET_L come to 3,3V and the mac start normally. I try to remove R7100 but same, i have SMC_RESET_L=1,4V When i remove U5110 and R7100, i have fluctuant from 1,4v to 2,8V on SMC_RESET_L

ok i change the board and now i have the green led but nothing. all-sys-pwgd=0 SMC_RESET_L=0V PP3V3_S5=0 PP5V0_S5=0 SMC_ONOF_L=3,3V SMC_TPAD_RST_L= 3,4V SMC_MANUAL_RST_L=2,8V strange no? maybe it's U5110? or SMC?

i'm sorry, i forgot to switch on my power supply :(:ROFLMAO: i have PP3V42_G3H and SCL/SDA at 3,42V

no the board don't turn on. i have just the board and the magsafe board. i haven't green led, i don't connect the battery, it's easier to measure voltage on board. SCL/SDA lines at 0V, SCL/SDA=0,5V in diode mode the customer close the mac open for the night and the morning nothing, the mac...

Hi, i have this board very clean, no green led (PSU and official charger) I have PPBUS_G3H=12,27V PP3V42_G3H_REG=3,42V DCIN_ISOL_GATE = 6,8V PP18V5_DCIN_ISOL = 18,5V SYS_ONEWIRE=2,85V ??? R7012 = 68Kohm thanks

Ok thanks i change U3200, the problem is solved.