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LCD Inverter Repair

Discussion in 'Troubleshooting and Repair' started by chiefnicholls, Mar 18, 2009.

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  1. chiefnicholls


    Mar 18, 2009
    I am working on a LCD computer monitor. It destroyed a polystyrene block shaped capacitor on the low voltage side of the flourescent tube display power board.

    The cap (I believe .1mfd) was between the two switching transtiors that power the step-up transformer.

    I thought this was a cap to supress "ringing" in the circuit. The original was melted, so I used a 250 volt .1. It bulged, and failed.

    No schematic, but this is similar to many others. That is why In used a .1 ufd.

    Any thoughts? I realize the transformer might have a bad winding, but I might have the cap value wrong.

    Thanx. Gary
  2. mrdoodad


    Aug 24, 2009
    Cap problem on LCD power board


    The cap is probably a 1000V rating, and you need to check (with meter, monitor off) the transistors for shorts. See if any suppression diodes (may have a BZ**** number) are burned up--circuit may have sustained a lightning strike..

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