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820-3476 Doesn't sense battery.

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  • dukefawks
    replied
    Short can be anywhere on the bus, inject voltage and see what current does. Start low cause the short is pretty low Ohm so should draw lots of amps quick. I expect something in the ISL area to heat up as that was messed with.

    Leave a comment:


  • gcain
    replied
    0 ohms on Pin 1
    10 ohms on Pin 2

    Leave a comment:


  • dukefawks
    replied
    R7005 is on the PPBUS not DCIN. But I guess PPBUS is shorted now. Measure in Ohms the resistance to GND on PPBUS

    Leave a comment:


  • gcain
    replied
    In Diode mode on R7005;

    ::1 = 0.000v
    ::2 = 0.004v

    So would this mean the short is on the pin 1 side?
    (trying to make sure I'm doing this right)

    Leave a comment:


  • gcain
    replied
    Dead Short. As in 0.000. :/

    How do I work out where the short is?
    Guessing I remove a component in the middle somewhere and see which side still has the short then repeat?

    Leave a comment:


  • dukefawks
    replied
    Check for shorts on the DCIN bus and PPBUS. Also get a fake charger for testing, they are sometimes handy.

    Leave a comment:


  • gcain
    replied
    You're right.
    I must have had the wrong PDF open. :/

    I don't have a fake charger here unfortunately.


    /taps fingers on desk.
    I'll have to try make a plan somehow...

    Leave a comment:


  • dukefawks
    replied
    R7012 is supposed to be 68K, so 61K in circuit is 99% probably fine.

    Looks like adapter is shutting down or not turning on. Do you have a fake adapter to test with?

    Leave a comment:


  • gcain
    replied
    R7012 is reading 61k and should be 1k...

    Leave a comment:


  • gcain
    replied
    Swapped it out again, soldering is definitely ok this time (no really, I swear).

    What does it mean when there is only 0.470v on PP18v_DCIN_FUSE?

    Leave a comment:


  • gcain
    replied
    Thanks, I'll swap it shortly.

    Soldering the first time round a bit rough, but the second time was pretty solid. ISL came off a donor board though so I'll try one I know worked before looking further.
    Thanks again.


    Leave a comment:


  • larossmann
    replied
    yes, as long as it says ISL6259AHRTZ on it. and agreed with duke & aprendiz that this must be fucked up soldering or something else knoccked off as it was working before.

    Leave a comment:


  • gcain
    replied
    Do you know if an ISL from an 820-3462 will work on that 820-3476 board?

    Leave a comment:


  • dukefawks
    replied
    Soldering can be fine, but the chip is dead. Redo the whole thing.

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  • gcain
    replied
    I redid the soldering and all looks okay.

    There is no draw now though. The adapter is only giving 0.5v.

    All fuses look okay. I haven't seen this before, any suggestions?

    Leave a comment:

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