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2013 13" MacBook Air Fans running full speed. ASD Errors 820-3437-B

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  • dukefawks
    replied
    Run ASD! U5620 is still suspect as you did not replace it.

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  • wrbailey
    replied
    Yep new fan still goes high speed as soon as it powers on.

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  • wrbailey
    replied
    I'll run ASD again.

    However my previous comment about ASD passing was prior to completely reassembling it and causing the screw hole damage. The fan was working as it should, nice and quiet, UNTIL I put the longer screw in the wrong hole, while assembling it. I'll try a different fan when I get back home, but I am not holding my breath. The stand off is exactly opposite of U5620. I'm sure it'll fail ASD now.

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  • dukefawks
    replied
    If there are no sensor issues in ASD it will be a fan issue and that is nowhere near that screw hole.

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  • wrbailey
    replied
    That screw stand-off for the fan exactly on the opposite site of the U5620 and the screw did go into the board, are we sure that wouldn't screw stuff up?

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  • dukefawks
    replied
    More likely the fan is bad. There is nothing there that would affect the fan.

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  • wrbailey
    replied
    So I made the ultimate STUPID mistake and put a slightly longer screw back into the fan top left screw hole. Now I get a screaming fan as soon as I press the POWER button. Any way to repair this, or did I just screw myself. I want to curl up into a little ball. I'm so pissed that I made that mistake. Apple does this on purpose, I swear...
    Last edited by wrbailey; 02-06-2017, 10:25 AM. Reason: fan -> Power

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  • wrbailey
    replied
    DING DING DING!!! U5620 was the issue. Didn't have to remove it. Heated with flux and scrubbed and then cleaned with alcohol and "ESD" safe haha q-tips and no more loud fan and passes all ASD.

    Thanks again for your help and wisdom! Makes me wonder why U5800 was so SOLDERED onto the board!?!?

    Leave a comment:


  • dukefawks
    replied
    Data bus issue then. Anything connected to SMBUS_SMC_1_S0_SDA can cause this. Usual suspects would be corrosion under SMC/camera connector/U5620. But any component on these lines can cause an issue.

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  • wrbailey
    replied
    ALS not responding to light shining at camera. Backlit stays fully lit.

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  • dukefawks
    replied
    Is the ALS working? Test by shining a light into the camera and see if keyboard backlight goes off/on.

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  • wrbailey
    replied
    Replaced the U5800. Still giving exact same errors... any ideas? Didn't screw up CPU. Still boots, chimes, everything. Just loud fans after a few moments.

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  • dukefawks
    replied
    It needs to come off so whatever. Board is trash like this anyway.

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  • wrbailey
    replied
    the u5800 IC is still soldered/welded to the board. I'm guessing that is a definite sign that it is part of the issue. I'm afraid to put too much heat on the chip, as it sits opposite of the CPU. Any recommendations? Heat the hell out of it to get it off and then cross fingers it didn't kill the CPU??

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  • wrbailey
    replied
    I did have liquid come in contact with U5800, so here is hoping!!

    Leave a comment:

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