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Samsung 22" monitor LCD bulb problem

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    Samsung 22" monitor LCD bulb problem

    Hi! I'm trying to fix my Samsung monitor (not LED).

    There are 4 bulbs (2 packages with 2 bulbs) so each package 4 wires.
    When I put one package (2 bulbs) works perfectly. But when I put both packages bulbs are dimmed (not so bright) and i hear transformer buzzing.

    When i try each bulb works perfectly on both transformers. But only when are both connected they are dimmed.

    Do you know where is the problem?
    I replaced inverter (SEM2005)

    P.S sorry for bad English
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