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Common Samsung 27" CRT failures.

Discussion in 'Electronic Repair' started by Dani, May 17, 2007.

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  1. Dani

    Dani Guest

    Units made around 1999, have seen common CRT failures. Model #
    TXJ2750X/XAC, Chassis
    # K51A. Units come in with 2SD1880 horizontal output shorted, & CRT
    arcing orange inside tube, replace horizontal output, set works for a
    couple of days, & the replaced CRT also starts arcing. Sometimes the
    CRT's lose the vacuum, other times, they arc, for no aparent reason.
    Sometimes, if you hit the CRT hard, the problem will show up. Anyone
    see the exact cause
    for this fault? High voltage & B + is fine, & horizontal output runs
    at normal temperature. Dani.
  2. Guest

    Have you checked the HT and then EHT? excessive HT woill cause
    excessive EHT. Also tuning components in the line output can cause
    excessive EHT. This should be around 25-28 KV. If these voltages are
    ok, maybe you are buying crap tubes?

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