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  1. D

    A1989 Display problem

    ok, so the best will be to replace the lcd, thank you.
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    A1989 Display problem

    Hi, I got this device with liquid damage. Mainboard is cleaned and was not many liquid to see. The display is not working. with another display the machine is working good. The big connector looks pretty good. I found that there is a burned backlight connector. So i soldered a nice...
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    820-4652 imac dont turn on

    I checked now again PP3V3_S0 is ok there is no PP5V-S4_REG U7600 and Q7650 and Q7655 are replaced already PM_EN_REG_P5V_S4_R (EN2) is 3.3V it is lighning only the first led from the mainboard
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    820-00138 dont turn on

    the client gave me now his original 85w charger is there any way to test it ?
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    820-00138 dont turn on

    is it possible that there could be from the beginning the main problem a bad dc-in board? can to much current caused by a bad dc-in board damage the u7100 and r7121/2 ?
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    820-00138 dont turn on

    I tryed with my original charger , no problems. my client told me he have a good original one too, here a pic. can u imagine that it could be possible a bad dc in board?
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    820-00138 dont turn on

    is it possible that the dc-in was the problem ? yes, i have a original charger, will try that, had only the lab-unit tryed
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    820-00138 dont turn on

    I have this device here, no green/orange light, dont turn on. found short R7121 Pin 1 to ground and high resistant R7121 and R7122 after replacing u7100 there was no short anymore. So i replaced the R7121 and R7122 after that all was ok but i found there goes 6A in to the machine. So I...
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    820-4652 imac dont turn on

    yes, that was for me the intresting part as well. now i checked again and yes there is no 5V_S0, but I replaced already U7600 inbetween so I measured bad S4 or bad S5 and have now a bad U7600. I am gonna replace it again and will post the measurements after that.
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    820-4652 imac dont turn on

    hi, i am just workin g on this device, no problems to see on the board first green led is lightning, no reaction by pressing power button pwr_btn_l ckecked platform reset is still low i have 3.41V, 3.3V_s0 and 5V s0 and 12V_S0 I dont have PP5V_S4_REG PP3V?V_S5_REG is ok both enable...
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    820-2915 replaced by apple turned off GPU

    thanks, that is working good for me, the jumper for BKLT_PWJ was needfull too.
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    820-2915 replaced by apple turned off GPU

    I pulled of the GPU Working good. 1) Is it possible to enable still the possible of brightness control? 2) is it without GPU still neefull to protect with password an accidentical PRAM reset?
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    820-2915 replaced by apple turned off GPU

    was no external screen, after flashing new bios i had external screen wich ttol to use for such modification in bios?
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    820-2915 replaced by apple turned off GPU

    ok, so now external is working, password is removed and i get starting up after a while th good old white screen of death, lets look now after gpu replace
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    820-2915 replaced by apple turned off GPU

    so, by replacing R8911 the gpu is already to see in the preferences, found a clear me bios but it shows up a lock, going to remove the password now
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    820-2915 replaced by apple turned off GPU

    I still found out that R8911 is removed
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    820-2915 replaced by apple turned off GPU

    Hi, I have here a late 2011 untouched Mainboard. Customer told me he had problems with the GPU and they switched off the gpu. of course a external moniotor is not possible and preferences shows only intel gpu. Machine is working good, the rotating donat is showing up as well. I want now to...
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    A1708 dont turn on after taking apart :-( 820-00875

    Thanks for your help , I was searching now 2nd day and finaly I found missing r7718, knocked off, I dont can explain me how it was knocked off. After replacing it everything is working like it should be. thank god! :-)
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    A1708 dont turn on after taking apart :-( 820-00875

    good morning. I got an a1708 with no big liquid damage. After replacing Topcase and Battery everthing is working good. The customer was happy, but now he came back after 6 month with audio problem. I found during I replaced the topcase I damaged the flexcable from the headphone jack port. I...
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