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Hope everyone had a good weekend, im still struggling with this board. does anyone have any ideas as to what i can check?

Good Day Guys, im not sure if ill be able to get some assistance on this iMac problem but here goes nothing. I have a 5k 27inch iMac that does not want to power on. The PSU is good (tested on another imac) and the diagnostic LED's are all off. Anyone have any idea where i can start looking? ;)

No Green Light, 3v42 not present.

Good Day Guys, i seem to have screwed up somewhere. After poking around too much i see that PPDCIN_G3H - went from 16v to less than 1v. it jumps between 0.4v and 0.7v constantly. seems like ive lost power to majority of the board. :(

Already tried that, the old cable got fried onto the lcd connector on assembly.

Thanks for the help turns out the Display assembly had an internal short, which kept blowing L8300. Replaced assembly and L8300 all is working fine now. :)

Gurmon Great News replaced R7020 and machine fired right up :D:D. everything seems to be working as should however the machine does appear to be running rather slugish. Has anyone come across such an issue after water damage.

Hi are you dure about L7090, doesnt seem the be on this board R7020 Pin 1 16.7V and Pin 2 0.27V. Looks corroded so ill replace that now.

UPDATE: DIODE MODE U7100 PIN17/18 - 3.4 Ohms PIN27/28 - 20,9 Ohms Voltages on U7100 2 - 16.5V 3- 3.8V 19-5.54V 20 - 5.54V 1 - 0.01V 26- 14.32V 9 - 0.02V 15- 0V

Good Day, got a 820-00138 board, has history of water damage, board was cleaned off, not getting a green light and no power. what will i need to check? there is no pp3v42 and pp20v_dcin_fuse - 16.7V adapter sense 0V

R5087 checked - 469K resistance to ground on SMC BC ACOK is 737K,ohms

Hi, yes i shined a flashlight through and still nothing. No picture at all.

Good Day Forum family, ive got a 820-3787 that powers on perfectly and works with external display, however it does not display anything on the display asssembly, no backlight no display. Yes its a known good display assembly. What will i need to check with regards to this problem.

Good Day 2.4V at both points

Good Day, a short update. pin 14 and pin 1 of r5393 are same voltage and the trace is good. So im still stuck with a board with no green or orange LED.

thanks i will check that, im in a completely different time zone, which means when your awake im asleep and vice versa. Do you perhaps have any other ideas i can try if the trace happens to be good? im currently using another board that does power on to test different points and i also get the...

the 3.4v measurement i got by testing pin 1 of r5393.

No its not.

Good Day guys, another board in for no power, no display no chime. Will not power off battery or charger, only orange light appears on led. (No battery plugged in) Ive taken the following measurements for now. PP3V42_G3H = 3.42V PPBUS_G3H = 12.6 PP5V1_CHGR_VDD = 5.5V PPDCIN_G3H - 16.7V...

HI, SMC_BC_ACOK IS 2.3V AT U7000 PIN 14. At R5393 its 3.4v