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    Diagnosing SSD issues

    Check if it is recognized in Disk Utility. Could be that the drive has APFS, so if the board has not had the EFI update it will not boot from it. Hardware should still be visible in Disk Utility though.
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    A1466 820-3437-b not turning on

    SMC_PM_G2_EN present? No short on 3V3_S5?
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    820-3662 Video Issue

    If you are US based order some 6708N from Mouser. I have to wait for China.....
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    820-3330 green/orange light on magsafe, no fan spin

    I have never had a CPU survive this so unless you have time to waste this is a very unlikely repair. There is no way to test the CPU besides fixing the board and hoping it works.
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    2011 GPU "Repair"

    The GMUX bypass does work, but way too much time wasted for me to go do that and backlight control does not work. No I cannot give you a link to chips for sale as the real deal is only sold when you are "in the know". The availability is so limited that unless you have good connections in China...
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    820-3330 green/orange light on magsafe, no fan spin

    High side FET on VCCIO is shorted out. This will have killed the CPU and or PCH already. This board is RIP.
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    8203115-b not turning on

    History? Liquid? Crap under SMC is likely, was SMC already fucked with?
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    820-00687 no power ppvrtc_g3h missing

    This does not bode well :( If this was not liquid then I bet the CPU fried. All the more recent Intel CPUs are so prone to either shorting RTC or Vcore.
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    820-3662 Random Shutdown

    Don't use your finger, it may shut down because you are conductive and messing up U7600 regulation. Poke the board with plastic tool and see if it is the same. Else it is just the common 3662 issue.
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    820-00426 No eDP screen, no Camera

    So there is an image in boot menu and while booting? That would suggest the GPU is working and when switching over to Intel GFX it fucks up.
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    820-4924 a1502 BKLT_EN, PP5V_S0 Missing

    The LCD cable can easily be replaced on retina LCDs!
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    820-3462-A - super slow - 300-600% High CPU usage on Kernal Task

    Run MRI and see if that turns up anything. ME should be ok if it passes the "chipset" test. https://drive.google.com/open?id=1ENhq5La9sZ5BWTo0vqaNzAcTOdWWaQAg
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    I hate ebay boards

    Bad transformer or broken traces from connector to transformer. Don't buy boards on Ebay, or if you must just file a not as described claim. You decided to fix so now you own it.. I would never fix a 2533 machine if the original board was FUBAR, just too old now.
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    Update EFI to support APFS

    There is a way but very easy to fuck it up and messing with command line. Do it safe and run a clean install.
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    [SOLVED]820-000165 Bad EEPROM. need bin please

    https://drive.google.com/open?id=13ZpCedkrBBbVjq2mZqgELCqMAgCwXx3H
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    820-3662 Video Issue

    Fix is on the way. Need to test if FDMF6708N will replace the 6808 ones. NEW FDMF6808 are nowhere to be found and all are sanded down garbage.
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    820-2850 ppbus_g3h

    Check all other rails for shorts again. 5V_S3 is the first suspect. What is 3V3_S5 doing with a battery and charger connected?
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    820-2879 no image

    Check diode mode on the same pins at the end of a separate LCD cable to confirm the connector is not bad.
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    820-3024 - Battery showing X, but runs off battery

    Don't use comments please! Either dead SMC or dead ISL6259.
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