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  1. N

    820-00840 brain dead

    I have inspected LCD flex cable and connector both on motherboard and LCD sides and there are no signs of liquid. I can't see any data lines on corroded are going straight to CPU. Even though it's possible, that CPU died?
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    820-00597-A iMac 21,5" 2017 random restarts, problem with booting to OS

    Do you mean SMC_PM_G2_EN, PM_SLP lines?
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    820-00840 brain dead

    I'm working on 820-00840 board which got damaged by coffee spill. It had corrossion around U3700/U3770/U2890/U3900/R5640/U8210 (pictures attached). I have cleaned it up, replaced U3770 and U2890, repaired broken traces, replaced damaged resistors/caps. Also resoldered U3700 and U8210. Area of...
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    820-00597-A iMac 21,5" 2017 random restarts, problem with booting to OS

    I have - the same thing. I have inspected board for damaged components but it looks perfect..
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    820-00597-A iMac 21,5" 2017 random restarts, problem with booting to OS

    I haven't tried BIOS files sent by you because after few days of waiting in the queue iMac doesn't turn on at all. It was untouched, I have turned it off last time, took out power cable and disconneced screen.. today it only has one diode light up on and doesnt react to power button, even if I...
  6. N

    Where to find ASD 3S156 and the latest

    You have to google for the ASD, it's pretty hard to get it now, but it's possible. Anyway ASD won't solve your problem. I would suggest you to start from hardware inspection. Maybe there is corossion somewhere on motherboard. High fan spin is moslty caused by damaged/corroded/unplugged trackpad...
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    820-00597-A iMac 21,5" 2017 random restarts, problem with booting to OS

    Ok, thank you. Is there a chance to post it today?
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    820-00597-A iMac 21,5" 2017 random restarts, problem with booting to OS

    I haven't found any BIOS file on forum for this model. I send you link to my BIOS: https://mega.nz/file/uDYizbDL#SPqYDFC3q8_PEK8_lRlUpGUj37g_XJRHsFDdbohPpNU
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    820-00597-A iMac 21,5" 2017 random restarts, problem with booting to OS

    Ok, I will. If what, do you have known good BIOS for this board? Or if I will send you my BIOS file, will you be able to clean ME?
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    820-00597-A iMac 21,5" 2017 random restarts, problem with booting to OS

    No changes, it shuts down randomly showing "this computer restarted because of a problem", then loads OS halfway and stucks.
  11. N

    820-00597-A iMac 21,5" 2017 random restarts, problem with booting to OS

    More than one week ago my customer brought in an iMac 21,5" 2017 for SSD upgrade. I've replaced HDD, cloned all data to new SSD and put everything back together, standard procedure. After few days customer informed me, that computer restarts randomly and then has problem to turn on showing...
  12. N

    820-00165 restarting randomly

    I think it's CPU problem, customer decided that we will replace motherboard, I will keep this one for components or future repair.
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    820-00165 restarting randomly

    It was working fine for one day and came back to previous state - restarting randomly, doesn't load or install OS..
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    820-00165 restarting randomly

    It seems, that reflowing RAM chips did the trick, computer works fine, installs OS and boots normally. Thank you, @2informaticos!
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    820-00165 restarting randomly

    Tomorrow i will reheat them with flux and post results.
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    820-00165 restarting randomly

    I have 820-00165 board on my bench which is restarting randomly, showing "Your computer restarted because of a problem..." message. Board was water damaged in the past, cleaned by other shop. Now it has no signs of corossion or damaged components, looks fine. It starts, sometimes boots to the...
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    820-00609 short on PPBUS / CPU PHASE

    I see, thank you for advices. One more question- which schematic/boardviewed can I use with this board as replacement? I can’t find anything similar
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    820-00609 short on PPBUS / CPU PHASE

    As he say, he use it for AutoCAD and SketchUP, but I’m not sure if they can load GPU so much. I will perform stress tests to find out how it behaves. In worst case it will burn PCB again or shut down because of not enough power. I’m wondering why it has burned layers of PCB instead of blowing...
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    820-00609 short on PPBUS / CPU PHASE

    Oh, sorry, I wrote CPU but I meant GPU. I cut off one of the GPU VCORE phases.
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