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Hi, i have this board, I can't enter in DFU mode. PPBUS_G3H = 12,31V i have all SLP2R but I have all AWAKE (PP3V3_AWAKE) is it normal? thanks Best regards

Ok i find C7607 short (PP5V_G3S) thanks for your help

Hi, i have this board very clean, no liquid, stop to work in use. i have the 20V on usb-c, the current is cycling between 0,029A and 0,600A and fall at 0A I try to restore but I can't see the Mac in DFU PPBUS_G3H =12,31V but fall when the current fall. Same for all: PP1V8_SLPS2R=1,78V ...

ok i remove D6950 the SDA line come back to 0,419V in diode mode. I change the diode, all is normal but when I charge the battery, the SDA line come back with the problem issue. if I stay without D6950, the Mac work well. edit: the Mac stop to charge after 2min, the SDA line has a problem...

Hi 2informaticos, no I haven't any voltage on C7050 when F7000 is removed without battery but I have 10,99V with battery connected. I remove battery to check SDA/SCL SCL = 0,419V in diode mode = 0,300V in voltage mode SDA = 0,103V in diode mode = 0,200 in voltage mode

Hi, i have this board, very clean no liquid spill, the board have 20V usb c but 0 amp. I havent PPBUS_G3H no short, I remove F7000 PPDCIN_G3H = 20V R7020/21=1 SMC_RST_IN=0V SMC_RESET_R_L=3,3V PP3V3_G3H=3,3V I try to change U7000 & Q7030/40 but same problem. have you an idea please? thanks best...

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?