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with power supply only i have 12,6v on both sides of the new resistance and PPVIN_G3H_P3V3G3H 20v on pin 3 of the diode it doesn't boot even without the resistor

video with powersupply only https://www.dropbox.com/scl/fi/5spoeqyazi0rm4f3ukemy/Video-05-12-24-20-32-20.mov?rlkey=kmaf20noxttvzw4gn72ofpyjc&st=z83f4i0s&dl=0

i've found R6907 defective it0s a nightmare: changed the resistence, now it doesnt boot anymore even with power supply only..

it doesnt boot with battery only and with battery and charger together. some times it boot..: i've reconnected battery and power supply and it booted again. as soon as i removed the cable, it power off. reconnected thecable-> 0,043 -.-'

c7020 3ohm c7023 2,5ohm

i don't know what to think....i've disconnected and reconnected all together and it has booted with battery and has charged the battery to the max (it was at 1% with service alert). as soon as i have disconnected the cable, it has powered off. now it doesn't boot anymore with battery. i've tried...

.a lot of things happen...i don't remember all the things i've done...i'm sure i've changed the diode and u7000. now it works! and boot without problem. but only without the battery. with the battery it goes to 20 but it stuck at 0,036 amp and nothing happen..

r6920 has right valure how should i check d6902? could i simply remove c6905/06? i really don't understand why i have 5v before the diode, and 1v after... could i remove d6902 and do a jumper just for test?

i've recheck all lines of u3200 following this guide https://logi.wiki/index.php/CD3215_Bootup_Sequence and all are ok until PM_EN_P3V3_G3H where i found 1,9v i've also PPVIN_G3H_P3V3G3H with 1v according to this...

pin 1 0,3v pin 2 1v pin 3 0v pin 5 0v pin 8 0,1v pin 9 0v pin 10 2v l6900 0,333 both sides

i've resoldered a new u3200 and both fuses, now i have 1,1 on u3200 but not on u3100. still 5v @0,46

yes all same behaviour without both fuse i have 0v

on d6902 i've PPBUS_G3H 4,8v, on PPVIN_G3H_P3V3G3H i've 1v

reProgrammed u2890, still the same 3V3_G3H 0v on R7020 5v on all 4 pins TBA_AUX_DET 1.2v TBA_VDDA 4,8v TBA_VDDP 4.8v SMC_RESET_L 0v BUF_SMC_RESET_L. 0v

hi to all motherboard is perfect. no shorts around usb-controllers i've 0V on PP1V1_UPC for each controller. (with cable connected) how is it possible????

Whaaat?

This is the error https://ibb.co/rdx1MY5

Solved the problem: it was the power supply… But now i have fans at top speed. I’ve done a jumper here but no luck https://ibb.co/K0KSQFZ

Hi to all, I have an iMac 21 2011 Customer said to change the power button because it works only few times I’ve changed it and changed also the solder paste on cpu and gpu but now it doesn’t boot I have only led 1 blinking I’m very angry with myself because of not having tested it before...

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