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Model #24PT6341/37 Phillips shut down

Discussion in 'Electronic Repair' started by [email protected], Jan 30, 2009.

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  1. Guest

    Need your help once again group - set turns on, high voltage comes up,
    get raster, and about 4 seconds later shuts down, but green power LED
    on front stays lit. Can power off and back on, and the sequence
    repeats. I've checked almost every cap, diode, resistor, and found
    nothing wrong yet. Tried freeze spray also, but it doesn't seem to be
    temp related. I suspect a shut down circuit, but I don't have the
    schematic to troubleshoot. The B+ drops about 7V after power up,
    otherwise is pretty stable. Anyone have experience or knowledge on
    this particular model or problem? Thanks for any help.
     
  2. Jerry G.

    Jerry G. Guest

    I am not familiar with your particular model of TV. I can give you a
    generic approach.

    Did you use an ESR meter to check the caps??? The ESR spec is very
    important!

    I have had defectieve high voltage multipliers in TV sets also cause
    what you are describing This part is usualy part of the flyback
    assembly. In some models of TV sets it is a separate module. In the
    case of this module going defective, the power supply can be put in to
    the protection mode.

    If there is a scan failure or some area that is pulling too much
    current this can cause the power supply to go in to the protection
    mode.

    I would guess you carefully inspected the set for any cold solder
    connections and any connectors that are not making proper contact.

    The other solution would be to get the service manual from the
    manufacture's parts distributor and spend the time to troubleshoot the
    set with a DVM and scope.


    Jerry G.

    __
     
  3. Guest

    Sorry for the late reply, and thanks for the info. I have not checked
    ESR on caps yet. I don't think my old Sencore checks them in circuit,
    which makes parelleling as easy, but not sure where to focus. I have
    suspected a shutdown circuit, but without the manual, I can only check
    component to component. I will have to find a schematic, and dig
    deeper. I have checked and resoldered many joints, but no change. I'll
    post an update. Thanks again for the info.
     
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