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Philips 41JP20 shutdown

Discussion in 'Electronic Repair' started by James Sweet, Jun 17, 2004.

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  1. James Sweet

    James Sweet Guest

    Ok I'm back again with this pesky thing. Finally got the replacement Diemen
    flyback, installed it, set came up but HV was about 8kv. Realized pins 1 and
    3 need to be swapped for it to be wired as in the schematic, do that and set
    comes up more or less normal. Now the bad news, I shut it off, unplugged it,
    and put in the rest of the screws holding the power board in, plug it in and
    turn it on, it fires up for a moment then shuts down. Monitored the HV,
    fired it up again, HV comes up normal for a moment before relay clicks and
    the set shuts down. I'm at my wit's end with this thing, what things can
    cause shutdown with this set and where do I start?
     
  2. techforce

    techforce Guest

    Could be bad solder on the power board that when screwed down cause bad
    connection. The Really old NAP's had bad solder Feed-thru's on the old
    Boards, and sometimes even on the AC Line Terminals, causing the Flyback to
    fail because it would be overheating. I would go through all the solder
    everywhere since its an older set.


    | Ok I'm back again with this pesky thing. Finally got the replacement
    Diemen
    | flyback, installed it, set came up but HV was about 8kv. Realized pins 1
    and
    | 3 need to be swapped for it to be wired as in the schematic, do that and
    set
    | comes up more or less normal. Now the bad news, I shut it off, unplugged
    it,
    | and put in the rest of the screws holding the power board in, plug it in
    and
    | turn it on, it fires up for a moment then shuts down. Monitored the HV,
    | fired it up again, HV comes up normal for a moment before relay clicks and
    | the set shuts down. I'm at my wit's end with this thing, what things can
    | cause shutdown with this set and where do I start?
    |
    |
     
  3. James Sweet

    James Sweet Guest


    Already did that the first time I fixed it before the flyback failed, guess
    I can go through it again though.
     
  4. techforce

    techforce Guest

    The fact you said it changed when everything was buttoned up would tell me
    it has something to do with that action. Try Running it un-buttoned, and
    Flex / Vibrate the boards in question.


    |
    | | > Could be bad solder on the power board that when screwed down cause bad
    | > connection. The Really old NAP's had bad solder Feed-thru's on the old
    | > Boards, and sometimes even on the AC Line Terminals, causing the
    Flyback
    | to
    | > fail because it would be overheating. I would go through all the solder
    | > everywhere since its an older set.
    | >
    |
    |
    | Already did that the first time I fixed it before the flyback failed,
    guess
    | I can go through it again though.
    |
    |
     
  5. James Sweet

    James Sweet Guest

    Yeah, though I also thought that perhaps the power cycle caused something to
    pop, I'll have to go through it again.
     
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