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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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solved changing 2 amplifiers

Diode mode for shorts? Could you show me where are the audio amplifiers? Are the 4 chip on the other side of the motherboard?

I have sound from headphones… I can set volume from button, but no audio from speakers…how is it possible? I’m going crazy!!!!

with the old board i have audio...

What do you mean with AUDIO FLEX??? Or small audio board????? It is a MacBook Pro….

so i have bought a fully working motherboard.. all ok except sound...i can't hear sound from speakers! i can hear sounds from headphone... no problems found in diagnostic mode in settings, i can see "internal speaker" like output.. tried smc reset no luck

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Bios already Tried…you gave me it some days before…

2informaticos, how are you?? all ok? i try to summarise i have activy led for both usb i can't boot any os from both usb ssd not seen (even with another ssd) if i go in recovery, as soon as i insert wifi passord, mac hangs and reboot ic camera was 100% resoldered (i don't know why) usb...

So i’ve removed the short! Now if i Connect ONLY POWER SUPPLY WITH THE MOTHERBOARD and nothing else, and try to push the power button, I have this https://www.dropbox.com/scl/fi/g0z6ksfmb9e2g7pw8k3e3/Foto-10-04-24-13-06-17.jpg?rlkey=4roiqxoarzg1jnwegvtkh1u66&dl=0 What do you think??

reg_p3v3s5_vout shorted from u7600

removing l7610 i have short only on pp3v3_s5_ssd

0,9 ohm...

ok! i have full short on c7620 pad ! it is pp3v3_s5_ssd!! if i inject voltage on this pad, i can clearly see the line near the ic that pulse....but i still have short even removing the ic!

Removed q8470 still short Removed u8490 still short

I’ve discovered something looking better with Thermal camera https://www.dropbox.com/scl/fi/gsqngzyaojcebicnaxz83/Video-10-04-24-11-29-19.mov?rlkey=377a5e4bb5pkzuigiqlunvfy9&dl=0 This is not the ic but the line that pulses ! I have full short on both side of this cap...