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no luck with SMC bybass. Thanks for the logi.wiki link, I don't get the fan spining at all but it looks very similar. Probably time to stop on this board.

Hello, A1466, connected USB Tester A4551 then plug magsafe. power led flash once, then power led and 5 volt flash, then all off, 3 seconds later, same sequence, then nothing. Customer asked if it could be related to power supply as they recently ordered a new one from Aliexpress. it works for...

Clean ME didn't help. I mount mb back, plug power cord, computer turns on (two leds only) but no image, unpluged power cords, keyboard, ,tried several times... nothing. Unplugged cable...wait 2 hours pluged it back, press power button...after few seconds it boot to login screen. I entered...

Bad luck, Medusa cannot clean ME on this mb. So this is the process to follow ? https://drive.google.com/file/d/1mGLNXsvc4q4zht5OTc6PXy6lzzOqOqTX/view?usp=share_link

What would you recommend, desolder the BIOS Winbond chipset to flash it or solder a connector on motherboard and then use Medusa ?

thank you, looking at other post, it looks like similar problem where solved by clean me, I'll search how to do it.

thanks. I've run it, tried with Ultra quality and 4K, it's not crashing.

Hello, I got this iMac 5K 2017 from another shop, sometimes it works, sometimes it doesn't. If I press power button, it start, I can log... then after fem mins sometimes it crash the reboot then I can login again and it will work, stay alive for the whole night.. then I shut it down... and...

thanks. Excuse my ignorance but how to flash U4770 SOC ROM (AB UEC 709 on the pics) ? EEPROM reader, I have it... ? That's the BIOS ? Need to desolder it or it there a way from the board ? I don't see any port. Can I take one from a working board and solder it ?

Mac doesn't start. no chemie, nothing on the screen. Is there a chance to do target mode in this case ? I've tried again, revive from recovery or from DFU, keeps failing. Last option is "erase all" I guess ?

Hello User was typing at school, close the lid went home then Mac didn't resume. He did a force shutdown by pressing power button. Mac never restart. When connected to Apple configuratior, when I plug cable it will show as "recovery". I did a revive, didn't work. I entered DFU, did a revive...

Hello i got A1708, customer said while opening the lid, sometimes it works sometimes not. I tried and most of the time it's black with no apple logo after chemie.... but sometimes it starts, I see apple logo, I see login prompt then it stops.. black screen but Mac still on. I install...

Thanks. PRAM reset 2-3 times. - DONE, no change. Check R7750-53 and their traces. traces are working, resistor seems to be ok. D7710 without LCD PIN 1 = 0.977 PIN 2 = 1.575 D7710 with LCD PIN1 = 0.969 PIN2 = 1.550

no problem but a working A1502 should be ok?. I installed the fauly motherboard and it's the same problem, I see the icon if I apply light to the lid, so it's not the screen.

Hello Took me a while but I finally found a cheap A1502 with working screen. I've installed faulty motherboard and the problem is the same, so the issue in not the screen. Any idea what i should look for ? thanks

I've asked but so far I haven't find A1502 to test.

the guy said he was in NY and screen stopped working suddenly. I don't have another A1502 at the moment but I can look for one.

Hi, Board = 820-3476-A I've been reading backlight sticky post and looking at potential failure using the two pics with all failure listed but I can't fix that one. There's no backlight, I see apple logo and login window if I apply light to the lid. U8300 PIN1 = 5.14V PIN 2 = 0V PIN 4 = 5.14...

Thank you. I did read the post before but I didn't solder wire, maybe I should have started with that instead of tweezer. Now I've solder a wire, when I connect to GND quickly, PM_PWRBTN_L drop to 0.3 and iMac boot. I've placed B2032 back. iMac is working correctly. Thank you for your help.

Using tweezer, I connect C600 ( SMC_ONOFF_L ) to GND and I monitor PM_PWRBTN_L with Multimeter, it's stays at 3.41 V