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  1. Dozer

    iMac 27" 2020 update failed

    is this yellow screen a possible faulty RAM or ssd? the catalina is working without any problem. Maybe the 12.5 has problems? I try now to install the 12.4 from usb stick
  2. Dozer

    iMac 27" 2020 update failed

    thanks, that is working, so far so good, but how to update the machine without problems? what would you suggest?
  3. Dozer

    iMac 27" 2020 update failed

    Hi i got an imac 27" 2020 in with failed update (from catalina to Monterey) turn on yellow screen I started in Transfer Mode and made a backup from the data then started DFU Mode and made a reset, after that i started with alt and "R" and got Catalina installed, normaly running seems all ok I...
  4. Dozer

    820-00840 no image/Backlight

    yes you are right nothing to loose, 2 more donar boards, thanks for help, case solved
  5. Dozer

    820-00840 no image/Backlight

    there is all 0V Checked on the caps C8520-C8529 on CPU side and found out that C8529 pin 1 (EDP_AUXCH_C_N) has OL all the others have aound .212 I have the another same board with the same problem and checked this and same, C8529 CPU side OL The "good" board has on all caps the same value in...
  6. Dozer

    820-00840 no image/Backlight

    Hi, got this board, looks clean no signs of liquid. no image, no backlight external Display shows image have connected a tested new display, with another mainboard, same flexcable image and backlight is ok. tested already this things: DP_INT_HPD pulse to 3.3V BKLT_EN_R 0V no pulse...
  7. Dozer

    iMac pro 2018 DFU reset help needed

    I tryed now installing Mojave on Host the target is imac pro 2018 mojave i tryed the host with a a1706 2017 installed mojave 10.14 got now error 10 this is discribed in mr.macintosh as osx not matching ..." BridgeOS Restore Error 10 – The BridgeOS Restore failed! This is most likely...
  8. Dozer

    iMac pro 2018 DFU reset help needed

    I still have the problem with the imac pro 2018 i can turn in dfu mode without problems but with the configurator happens the error 06 the last osx i installed was Mojave. is it needfull on the host computer to run mojave as well ? the target is imac pro 2018 mojave i tryed the host with a...
  9. Dozer

    820-01061 iMac 2017 4K grafik problem

    ok, thanks, so i replace the mainboard here as well
  10. Dozer

    820-01061 iMac 2017 4K grafik problem

    hi, got the imac working like it should be but sometimes it has some graphical problems. i didnt found in the forum or anywhere else an issiu like that. so i replaced the mainboard. now, yesterday i got again an imac, same board same problem. so this should be a common issiu, looks like gpu...
  11. Dozer

    A1707 no backlight

    Problem solved, there was another crack in the cable, so i connected like in youtube and some jumper wires then from the junction until almost where the cable is coming out of the screen, hell that was a solder trip! :-) ok, but its working now, thanks for help.
  12. Dozer

    A1707 no backlight

    Hi, got this A1707 with no backlight, only when open a little bit i can see the display. so I found here in the Rossmann Wiki this by the way the black film it can be more clean and easy removed with fine sandpaper instead of scratching with the knife I tryed that and I have Display now but...
  13. Dozer

    iMac pro 2018 DFU reset help needed

    hi, got the imac pro without any sign of life. client told me machine crashes randomly and install from internet ending with error 1008F, but now dont turn on after replacing the power unit the machine turned on but was not possible to install or restore all ends with 1008F so tryed the DFU...
  14. Dozer

    A1534 2017 flickering during boot up by pressing a key

    ok, at first now i replaced the display with a 2017 one because of the sleep magnets, thanks @dukefawks and. the audio is not working, dont show any audio device. under the thermal cam, if the audio board is connected the flex cable getting very quick very hot starting on the mainboard...
  15. Dozer

    A1418 iMac 21.5 2017 4K turn off after start booting

    no history, but looks clean can u post me a link for a clean me bios? its an 820-01061
  16. Dozer

    A1418 iMac 21.5 2017 4K turn off after start booting

    hi, got this iMac, holding down "Alt" by turning on I can select wich drive. This is not turning off the device after selecting external known good disk I can see the apple and the loading line, after some milimeters from the loading line it turns off completly and start again. RAM I replaced...
  17. Dozer

    A1398 Battery Service

    ok, Problem solved, thanks for help. I made backup from client disk then i deleted the disk in the machine and installed new high sierra, after that i upgraded to catalina(this was original osx on client disk) then I migrated the data from the backup(started with another machine) to the client...
  18. Dozer

    A1398 Battery Service

    and after upgrade if no error should i try a migration from the original catalina client disk?
  19. Dozer

    A1398 Battery Service

    the original is catalina with the error, the machine is A1398 2015 i cloned a backup disk and installed big sur and that gives the error as well i tryed the disk with big sur on A1706 -> no error A1502 2015 -> no error now i started from thhe A1706 with external disk from client with big...
  20. Dozer

    A1398 Battery Service

    the problem is still there. before i try your proposal I tryed the ssd external from another macbook (A1706) there is okay, no battery service
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