marants-lc3250ex

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  • willyam1
    Senior Member
    • Feb 2012
    • 112
    • israel
    #1

    marants-lc3250ex

    Hi to all.
    this tv came no power dead.
    found 5a fuse and rectifier short.
    change them and now back light is flickring.
    notice that instead 24v ther 20v and 12 its 10v and they not steady.
    notice that the PFC section is not working and the voltage in the big capi is always 300v found 2 smd resi 2.2 and 220 ohm open change them and I change also ic smd pfc fan7527 but no luck still flickeringTHE IC PIN 8 VCC IS 14V but no pulses to the pfc transistor and diode.
    the power supply is BPS-402 REVA 23.2.2006.
    ant schematic or idiae?.
    willyam
    Tags: None
    • willyam1
      Senior Member
      • Feb 2012
      • 112
      • israel
      #2
      Re: marants-lc3250ex

      tv is fixed.
      didn't see the big transsitor was blown away its hiding neer the ciol of pfc change it and resolder the new is fan7527 .
      works fine about an 60min.now voltage in the pfc big smooth capi is 398v
      willyam
      Last edited by willyam1; 06-07-2013, 01:57 AM.

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