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    820-3481 imac 27" late 2013 simple upgrade question

    found that probably the efi dont support the 4790 only the 4771 there is no way to edit the efi that way?
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    820-3481 imac 27" late 2013 simple upgrade question

    820-3481 i checked the 820-3299 because i think no one has the 3481 J4500 has only SATA_SSD lines. so thats the reason isnt it? but may be the 3481 accept nvme? and the 820-3299 has in the schematic a 1155 socket but my board 820-3481 has a 1150 socket. in the socket is the SR14D i5-4670 but...
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    820-02016 dont turn on

    hi got this device with liquid damage. first accu was not good, with other one it turned on but dont recogniced the charger after that i found liquid damage around U5200 and around F5200 i cleaned that up, found i2c_smc_pwr_3V3_scl had to high value in diode mode, replaced UD201, then scl and...
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    820-3481 imac 27" late 2013 simple upgrade question

    Hi, i wanted to uügrade this imac but there faces me some problems. 1. upgrade from i5 CPU to i7 4.0Ghz (4790K) insert the i7 there i have only 1. and 2nd led after a wilhle second turns off and first is only on then second turns on again and so on, no dong, nothing insertet the i5 all is...
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    820-01061 imac dont turns on, but if 2xclick power button quick is ok

    Hi, got this imac with now signs of life, no led nothing, replaced with a known good power unit, nothing. found short in PP12V_ACDC pin 3 and 4 J6900 figured out, that Q8450 is blown, replaced it and the short is gone now already the first LED is coming up but after pressing power the LED turns...
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    RAM upgrade MBA A1466 820-00165

    ok got he new chips H9CCNNNCLTMLARNUD with that all working good. so problem solved
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    820-5509 Mac mini RAM upgrade no boardview

    found it here: https://forums.macrumors.com/threads/mac-mini-late-2014-ram-upgrade.2338205/ , perhaps it can helps other people
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    820-5509 Mac mini RAM upgrade no boardview

    nobody any idea? i nowhere found a boardview
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    820-5509 Mac mini RAM upgrade no boardview

    Hi, i want to upgrade the ram here. found in the schematics RAMCFG 3..2 and 1..0 but wich resistors ? without boardview that will be a problem. can someone help me ? i have Hynix 4GB RAM Moduls So that will be 100K to R2291 and 10K to R2284,R2282, R2280 and to pull out in R2292, R2290, R2294...
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    RAM upgrade MBA A1466 820-00165

    i think i figured it out. got another 11" 820-00164 and i had still 4 RAMs left, so I soldered them there in and the same problem occurs. today i found out that the SEC K4E6E304EE-EGCE I ordered has only 16Gb that means 2Gbyte ! So I soldered 8GByte in the Board and configured it as 16Gbyte...
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    820-01700 16" MBP A2141 dont turn on

    I use a laboratory power supply , until now that was good for all a2141 PP1V8_SLPS2R 1.81V PP1V1_SLPS2R 1.11V PP0V8_SLPS2R 0.81V PP1V8_AWAKE 1.8V PP3V3_AWAKE 3.36V PPVDDCPUSRAM_AWAKE 0.81V PP1V2_AWAKE 1.21V the history is it stopped from one day top the other I was sure...
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    820-01700 16" MBP A2141 dont turn on

    Hi, just this device came in 20V draw with batterie no dong, no display checked the power sequenz from repair wiki https://repair.wiki/w/A2141_2019_16%22_MacBook_Pro PMU_CLK32K_PCH is ok PMU_ACTIVE_READY is 1.8V PMU_ONOF_L is 3.3V PP3V3_S5, PP1V8_S5 is 0V R8013 Pin1 has a nice sinus wave...
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    RAM upgrade MBA A1466 820-00165

    thanks tomtom67 from this i was inspired to try this. the state now is i can start high sierra without problems and i can see the 16GB in the system information. the main problem still is its randomly freezing . so my guess there is wrong timing configuration. what do you mean?
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    RAM upgrade MBA A1466 820-00165

    starting highsierra osx from external is no problem in system i can see 16GB RAM
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    RAM upgrade MBA A1466 820-00165

    i have the 820-00165 4GB version and want it upgrade to 16gb so i bought 4x SEC K4E6E304EE-EGCE and soldered it in then i soldered the RAM straps like ino datasheet DDR3:SAMSUNG_16GB CFG0: L CFG1: H CFG2: L CFG3: H that worked but coming apple and during loading 30% it is turning off then i...
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    820-01521 don t wake up after lid close

    tryed in another case and all is ok. Found there is another sensor left side nearby the microphone. after replacing the microphone all is working. Problem solved
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    TrueTone Displays

    this? both chips need to be replaced yes?
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    TrueTone Displays

    i have an A2338 and by replacing the Display with another one I bought the TrueTone Option in the Display Menu is missing. Is there any way to copy a serial from the origianl display or like that in to the other display to make this work again?
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    820-3437 dont turn on

    found no problems with SPI Bus Termination resistors so i decided to replace the mainboard, i think you are right, PCH is bad
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