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RCA TV model TX821TB, Ch. E13209BC

Discussion in 'Electronic Repair' started by [email protected], Sep 21, 2007.

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  1. Guest

    This set had a shorted hor output and an open 2.7 ohm fusible in the
    power supply. I also did alot of soldering on the board as well. The
    original output transistor was an S2000. The Thompson data sheet shows
    it as being a 1500V 8 A part. I used a BUH 715 as a sub which is also
    a 1500V transistor and it is a 10 A part. When you hit the power the
    set seems like its trying to start with a slight sound from the
    speaker at about 1 second intervals. Lowering the AC line to about 70V
    will make the set come on. After its on for about 3 minutes or so you
    can raise the line to 120 and the set will stay on. Does it seem like
    subbing a hor output could cause this? Thanks, Lenny Stein, Barlen
    Electronics
     
  2. Art

    Art Guest

    Good probability but there are probably other issues causing the startup
    problem. High esr caps in standby power circutry, etc. Check the horiz drive
    to the horiz driver driver and at the base of the output when the set is
    having startup problems, while monitoring the B+.
     
  3. Guest

    I'm going to take a look at the caps first. Thanks, Lenny.
     
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