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A1502 820-4924 restarts all the time when power on after liquid spilled repair

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  • turbo
    replied
    Originally posted by roy.ruan View Post
    i tried without the keyboard already, same stuffs. Check the connector carefully couple times , it shouldn't be the issue, i check voltage on onoff_smc, not low ,so nothing to do with the connector shorting it to gnd
    remove the connector , there is short inside connector, then try

    Leave a comment:


  • roy.ruan
    replied
    Now I regret about the Ultrasonic process,really makes it way harder to find. so many areas got spilled for this one. seems like no regular routines can go and check by multimeter,will just look around otherwise just give up if nothing found

    Leave a comment:


  • dukefawks
    replied
    Corrosion somewhere. I had one with a similar issue and there was corrosion in the CPU Vcore power supply area. But it could be so many other things. Inspect carefully for corroded resistors and traces.

    Leave a comment:


  • roy.ruan
    replied
    I tried without the keyboard already, same stuffs. check the connector carefully couple times , it shouldn't be the issue, i check voltage on ONOFF_SMC, not low ,so nothing to do with the connector shorting it to GND

    Leave a comment:


  • turbo
    replied
    Originally posted by roy.ruan View Post
    having 2015 a1502 820-4924.
    machine came in with no power at all,liquid spilled. ultrasonic cleaned and replaced most heavy spilled components.

    power back on already, hear the chime, then restarts,chime , then restarts, chime then loops....feels like the P+R+COMMAND+OPTION reset thing going on all the automatically.

    tried disconnected keyboard and touch pad, same
    onoff_smc =3.3v
    ws_kbd_onoff_l=3.3v

    voltage on pin 1,2,3 are 0 on J4813(keyboard connector)
    diode mode on them are all around 400+

    so I replaced U4850, same stuffs.
    doubted corrosion under U4820 and U4830, flux and heated , but same stuffs still

    any suggestions please?
    thank you!
    change the key board connector on board / try without key board see if its restart

    Leave a comment:


  • roy.ruan
    replied
    it actually restarts before it loads the OS , I tried another SSD already,but same story.

    Leave a comment:


  • dukefawks
    replied
    Could be corrupt OS, so remove SSD. Could be 100 other corroded things too......

    Leave a comment:


  • jason_microsoldering
    replied
    Is the SSD plugged in?

    Leave a comment:


  • A1502 820-4924 restarts all the time when power on after liquid spilled repair

    having 2015 a1502 820-4924.
    machine came in with no power at all,liquid spilled. ultrasonic cleaned and replaced most heavy spilled components.

    power back on already, hear the chime, then restarts,chime , then restarts, chime then loops....feels like the P+R+COMMAND+OPTION reset thing going on all the automatically.

    tried disconnected keyboard and touch pad, same
    onoff_smc =3.3v
    ws_kbd_onoff_l=3.3v

    voltage on pin 1,2,3 are 0 on J4813(keyboard connector)
    diode mode on them are all around 400+

    so I replaced U4850, same stuffs.
    doubted corrosion under U4820 and U4830, flux and heated , but same stuffs still

    any suggestions please?
    thank you!

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