LG 42PJ350 warm IGBT

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  • nenea dani
    New Member
    • May 2008
    • 7

    #1

    LG 42PJ350 warm IGBT

    Dear colleagues, I want to fix the LG 42PJ350 that burned the C766 330pf / 1Kv capacitor, and the IGBT Q11 (30J124) and Q21 (30F124) all came in from Y SUS . I have changed the three components from two different sources and the situation is the same. At startup, the image is very bright, with lots of red and noise as if it were a weak signal TV. In 20 seconds, the image gradually returns to its correctness, but the radiator on which the Q11 (30F124) lies is extremely warm . It looks like it's all in the area of this transistor and this in max 30-40 seconds. I do not find anything abnormal in the board or the Y drivers. I have no access under the board but I have two voltages of 5V and 17V that are also noted. The Q11 is a 5-smd smd driver that writes 5K and it measures as another. The only thing I can bind to is a yellow sponge between two sheets of plastic under the radiator in question that I threw from the beginning.I read all the posts related to this defect. Any idea is welcome.

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