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Right away but just found ... I put a new R7085 in and Im now getting fanspin but only with lab PSU. 2 genuine charger 60W/85W wont start it. Shall I get those voltage when on genuine charger without fanspin?

I was using genuine chargers but good idea to try lab psu. Lab PSU at 16.6v gets orange light and fans did spin but not for long. Now dead again. Orange light stays on when plug charger pp3v42 3.4v ppdcin_s5_chgr 16.42v chgr_agate_div 15.68 so left side of Q7080 should be conducting yet...

Customers board not turning on. No corrosion evident. Replaced U7000 and Q7080 and seemed to fix but trackpad cursor had jerkiness. Very quickly went bad again. The 68k ohm sparkitecture resistor was not 68kohm so I replaced it with 68kohm and some changes occurred. Green light would come on...

Oh does that "1V8R1V55" mean 1.8v or 1.55v is ok? History: owner said it was bought refurbished from Apple. Had a loose hinge screw that just needed tightening. No corrosion evident. Im a BIOS virgin Im afraid. I do have a CH341A programmer bought in anticipation. Hope it will do. I don't have a...

C9560 changed just now but still no USB activity visible on snow edition memory stick. PP1V8R1V55_S0GPU_ISNS_R only achieving 1.56v No video

ppvcore_s0_cpu is 0.82v ppvcore_s0_gfx is 0.88v gpu_vcore_vid0 is 3.3v fans at full speed, no usb activity

I was using a 60W charger! I didn't know about the 85W requirement :) I switched to using an 85W charger and I am getting the same symptoms but now not needing the battery connected to get some activity. So still no chime or video or USB activity. Wondering where to go from here

With board in case and fully connected I get green light, fan spin, no chime or video With board removed, battery disconnected and charger attached I get no fan spin. ppbus_g3h and pp3v42 good. S0 and S3 rails 0 volts. pm_slp_s4_l = 0v pm_batlow_l = 0v. (wont this always be low with no battery...

I have the same board rebooting when I run geekbench 5 to stress it. Are there diagnostics available for download For this board?

Many thanks for your help 2informaticos. I think the speed of the SSD does compensate for the suspecting slow running so they may be happy - but Im keen to find ways to debug these issues. Question: Is there a utility or unix command to confirm slowed processing? Throttling Question: Is it...

Yes the slowness and semi frequent SBBOD was there before anyone opened the iMac. It is the sole reason customer has brought me it. I tried booting with the webcam removed - no difference sadly. LCD sensor reports 129c when screen disconnected and 25c when connected so no suspicion there...

The temps as reported by HWMonitor.app were with the original Apple supplied spinning HDD. I do see SBBOD . I’ve replaced the HDD with a Samsung evo 960 [and a SATA extension that hopefully grounds the temp sensor pin] the 249c has now become 129c. Fan still wants to spin fast and SBBOD still...

Are schematics, boardview and diagnostics available for this board? Link appreciated if so. Are there any common problems with this one? Fan is going fast and HWMonitor.app reports high temps on HDD bay 1 (249c), HDD bay 2 (129) and GPU 2 die (129)

Diode mode to ground on exposed pins 53 to 29 of SSD connector are similar between two boards using same SSD. Pin53 to pin29 reading (dashes separate the pins) 0-.4-.4-0-OL-.4-.4-0-.4-.4-0-.4-.4-0-0-.4-.4-0-.4-.4-0-0-.04-.04-0 My other board had very similar values with only pin 52 varying...

Will the external monitor be detected if the OS is not booted?

Diode mode to ground on exposed pins 53 to 29 of SSD connector are similar between two boards using same SSD. Pin53 to pin29 reading (dashes separate the pins) 0-.4-.4-0-OL-.4-.4-0-.4-.4-0-.4-.4-0-0-.4-.4-0-.4-.4-0-0-.04-.04-0 My other board had very similar values with only pin 52 varying...

Thanks for confirming that! Then I have two thunderbolt to HDMI leads that don't work - do they need to be genuine Apple leads I wonder....

I don't understand what you just said. I am wondering whether video is output via thunderbolt when the logic board realises the LCD panel is not connected.

Thats a good question - how I came to the conclusion to join pin1 to pin7 which now looks like joining two grounds together. Before I figure out why I did this do you mind if I ask another question on logistics.... With the LCD screen removed from the iMac will video be available via the...

Yes sorry Ive updated the title now. I have managed to work out its a 820-3126 logic board on this iMac although only by comparing its layout with what 820 logic boards sell as a logic board for an A1311 - I haven't removed the board yet and I think the actual board number must be on the hidden...