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    Imac 21.5 late 2013 a1418 (emc 2638) display not working no 4th diagnostic led

    Hello, I'm trying to repair an iMac A1418 (EMC 2638) which have a display fault. Seems on cold boot display works on a black screen; the time span is a few minutes before the display fails. I tried an external monitor and it works, correctly. The board is a 820-3588-A. When the display is...
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    820-2879-B Mid-2010 13" beeps.. sometimes

    Hi, I have this 820-2879-B that comes on macbook pro initially seems to freeze randomly. i thought was a RAM problem: changed with (2x8GB) DDR3 PC3-8500 1066MHz and started to work normally since, during a firmware upgrade, the macbook freeze. EFI Chip damaged: SOS Beeps. Changed Chip and now...
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