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Hitachi 50" rear projection TV dead!

Discussion in 'Electronic Repair' started by Dani, Jul 20, 2007.

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  1. Dani

    Dani Guest

    Model # 50UX57B Chassis # AP83R, was worked on elsewhere! Both
    convergence IC's were replaced, & I found D910, & D911 12 volt zeners
    in the SMPS shorted. E995, & 996 fuses were replaced. I replaced the
    SMPS IC regulator. All the pico fuses, & fusible resistors are ok.
    Nothing looks overheated. Nothing else is bad, that I can find!
    Nothing is dragging down the secondary of the SMPS, but it just won't
    oscillate! All the capacitors in the secondary, & primary of the SMPS
    check out fine! Anyone see this type of failure, in this unit? Thanks,
  2. Changed the optocoupler yet?

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