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dont know the 820 code.. 27" 2011 machine of a strong smoker... image is present - only backlight is missing. backlight turns on for 1 second on boot, then shuts off..

Hey, any idea for this problem? iMac 27" 2011 Backlight not working. Graphics good, iMac boots, externally fully functional. The backlight turn on for 1 second when i press the power button - then shuts off. LED driver board is replaced. Same problem. Any ideas?

Q3501 was causing short - crazy. this was a new chip. replaced with new one and its running.

chimes, after few seconds turns off, restarts again...

Hey guys, got a strange iMac here. From 2017. No image/video. When LCD is connected, all 4 LEDs are going on. LCD disconnected - 3 LEDs are on. iMac chimes, Backlight is turning on, fan is spinning. LCD fuse is ok. Heating up GPU? RAM? Whats going on with this machine?

just changed internal LCD cable - everything is there. jesus with us.

3v is there, 5v is there DP_INT_HPD is not there. 0V

Hey guys, got a strange board here. MacBook dropped on floor / no liquid damage. Thought it was a bad lcd. chimes/boots/works externally. replaced LCD screen - no difference. pram reset/dfu - nothing. where to start?

3 - 3.2 OHM on L7211/21/31 7 OHM on L7410/20 0.3 OHM at ppbus_g3h

on C658X? yes. can you tell me where to measure?

this is the resistance to ground on ppbus_g3h...

okay. resistance is 0.02 / 0.03 OHM, almost nothing

yep, everything beeps C3500 looks like shit, beeps too

diode mode beeps on ppbus_g3h / 0 R7020 all 4 pins, 5V

Hey! History for the board: water damaged / on top of the case replaced U3500 + Q3501 - board was working fine -> usb-c docking station connected on the side of the water damage -> dead -> 5V / 0.02A ppbus_g3h is 0V should i just replace the CD3217 or where to start to troubleshoot?

fixed! R7005 replaced. ty!

pin 6, 8: 2,7 diode mode to ground: both: 0.333

update: replaced u7090; jumper wire to r7080 PP3V42_G3H is 1.7V PPBUS_G3H is 0.5 something what´s going on with this machine?

Hi! Just gave some flux and hot air to the U6100 to see what happens: (had light before the whole time) no light at all - and i discovered that u7090 looks like shit hows that/is it possible?! replace u7090 and fix traces - should be a working machine?!