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Looking for Zenith SMPS rebuild kit

Discussion in 'Electronic Repair' started by Rua Dumas, Jan 10, 2004.

  1. Rua Dumas

    Rua Dumas Guest

    Trying to find a rebuild kit for a zenith Z32X31D switching mode power
    supply. Any information would be greatly appreciated.

    TIA, August
     
  2. Sofie

    Sofie Guest

    Rua Dumas / August
    Most rebuild kits include:

    fuse
    bridge rectifier
    zener diode(s)
    power switching transistor
    opto-isolator
    misc small signal transistors
    electrolytic capacitors

    As you probably know from reading past postings on this newsgroup, the most
    likely failure items in most SMPS circuitry are faulty high ESR electrolytic
    capacitors, shorted diodes and shorted power switching transistor.....
    obviously the other parts can fail too and should be checked.
    Many shop techs don't bother with the time consuming wholesale changeout of
    all the parts found in a rebuild kit. They usually conduct component tests
    and only replace what is necessary. Because of this, if you have the
    necessary repair experience, electronics knowledge and proper test equipment
    you may not want to bother with the rebuild kit and just perform component
    level troubleshooting.
     
  3. Jason D.

    Jason D. Guest

    32" is worth getting whole kit changed wholesale. BUT, double check
    that CRT is not chassis fryer. This will fry SMPS if the CRT is
    leaking too much or G1 short, also bad CRT usually takes out a small
    transistor buffer, there's three for red, blue and green that is next
    to jungle IC. Sometimes CRT get too much causes CRT driver transistor
    to run hot and short out forcing me to repair the repeat unit, put on
    heatsink for it. Helped much.

    Today I finally came across a 27" zenith with dud vertical IC.
    Replaced that vertical IC, found out that set has good CRT and SMPS
    was running much cooler. In past with other zenith sets in this 25/27
    sizes even 32" had SMPS heatsink running almost at meltdown because of
    lousy CRT leaking too much pulling on whole chassis. I did rejuvenate
    the zenith CRTs too and still doesn't do the job. Did the SMPS
    rebuild & checked caps and replaced key caps that has too much ESR FYI
    and they still run red hot.

    I had a bunch of that zenith TV sets with blown SMPSes about 1 and
    half years ago just on SMPS rebuild since then, finally died down to
    quiet.

    Cheers,

    Wizard
     
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