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(Topic ID: 213561)

IO board fault analysis

By shaneo

6 years ago



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    #1 6 years ago
    OP
     
    YYY

    shaneo

    Pinside member

    AU Canberra

    10y 31,550 90 7

    4/4 IO boards in my FullT have faulted with Q20/coil 6 gnd shorts. This evening Q20 replaced on 2x I/O's and tested all 4 I/O locations. Both developed same fault when connected to big board on LHS.

    Big LHS brd removed. Tests with short col 1 gnd - col 2 70V at connector.
    No wonder I/O's are failing.

    I/O's have A,B,C pins on column connected.
    No solder bridges found but trace existed in PCB col 1 col 2. Trace cut, mosfets
    replaced ,re-tested, no faults found.

    Fair dinkum, I can knock up boards like this in my toaster oven.

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    #2 6 years ago
    OP
     
    YYY

    shaneo

    Pinside member

    AU Canberra

    10y 31,550 90 7

    IMG_20180331_221947 (resized).jpgIMG_20180331_221947 (resized).jpg

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    IMG_20180331_221241 (resized).jpgIMG_20180331_221241 (resized).jpg

    IMG_20180331_220728 (resized).jpgIMG_20180331_220728 (resized).jpg

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