Connect with us

LCD Inverter Repair

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

Scroll to continue with content
  1. chiefnicholls

    chiefnicholls

    1
    0
    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

    mrdoodad

    3
    0
    Aug 24, 2009
    Cap problem on LCD power board



    Gary,

    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..

    DP
     
Ask a Question
Want to reply to this thread or ask your own question?
You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.
Electronics Point Logo
Continue to site
Quote of the day

-