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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...

Ive shorted to ground pin 7 to GND (pin 1) on a SATA extension cable and it has had the desired effect of getting rid of the high temperature indication :) But attempts at cloning to the drive using Disk Utility and carbon copy cloner results in complaints of S.M.A.R.T status errors. Should I...

smc_pwrfail_warn_l is also 0v on another board I have so I think I will assume this is normal. Wow well spotted, after I zoomed to 800% I can see the negation!

Initially no fan spin, 33mA draw and very clean board except slight corrosion around R7611, cleaned up and got fan spin but left with flashing folder. pp3v42_g3h 3.4v ppbusg3h. 8.9v draws 780mA pp5v_s5 5.09v pp5v_s0 5.3v ssd_pwr_en 3.3v smc_pwrfail_warn_l...

Many thanks for the diagnostics - HD temp issue - Im looking at the numerous different suggestions for hacking the ribbon cable on this no-sensor iMac. that Ive added an Adata SSD to.

Ive installed a new 1TB SSD and installed High Sierra but still incessant SBBOD. So it looks like I need to get hold of ASD 3S145. How do I get hold of it? Searches just take me to what look like dodgy sites.

Thanks again 2informaticos, How do I get hold of the corresponding EFI ASD test? In case this reveals a particular area of trouble are there schematics available for iMacs so I could locate the device? Is there a way to determine why the OS is displaying the wait cursor? core dump?

A customer has sent me there 2011 A1311 iMac for memory upgrade and SSD upgrade in the hope of getting some use out of it. But its plagued with the spinning beach ball of death (SBBOD) after virtually every user interaction and it lasts for several minutes. Ive tried two different MacOS versions...

Thanks. Yes I think for a beginner Ive got a pretty hopeless board. I have talked customer around into purchasing a refurbed board (at his expense) but before going down this route he wants confidence in the rest of his computer working first. Its around $500 as it was 3.3GHz and 16GB/512GB If...

No USB activity indicated by SNOW edition USB drive. Aside: Customers decision to proceed with in-depth board repair could be dependant on if they also need a new screen after the burned screen connection. Question: can backlight be tested with just a variable voltage on the [burned] connector...

Many thanks for your fast response 2informaticos, Ive updated the title of the thread with 820-00239 I will look up how to check USB activity in these thread but its late here 10pm. I will remove/re-tin/reflow as suggested - thanks. I am keen to understand if there is another way to know if a...

Hi All, I am new to board repair but have an education in electronics from college two decades ago. Having lost my job in aviation I'm hoping to make a go of Mac board repair in the UK. Ive had some luck with repairing a couple of MacBooks using Louis’s fantastic videos but the A1706 appears...