Question about Toshiba 32A33 32" TV

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I need a replacement part # and location for the "BAD-Blue Signal Video Output Transistor"???

I am a retired A/V technician and I have the ability to replace this component if someone can locate a shematic and get the infor mation that I need...thanx, Franklin - muzitronixman/yahoo My Zenith 32A33 screen goes blue after it warms up and then it turns itself off and after it is back on, it looks like the picture has a translucent blue veil over it and there are darker blue slanted lines across the screen. Best Solutionposted on Jul 26, 2006 By Pravin Rank: Master Rating: 76.38%, 304 votes Pravin indicated that his solution for 32A33 32" TV Problem is valid for all Standard Televisions 90 % probability, looks like the Blue Signal Video Output Transistor has become faulty. This is a very simple "fixable' problem for a Professional Technician. Should not take more than 15-20 minutes.

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  • Frank DuVall Aug 05, 2007

    Thanx, Mike from NJ ;^)

    Sounds like you have a much better handle on this than Mr.Praven suggested. I pulled the CRT board off to see if I could figure out where to put the test lead for the Blue gun but without a scematic diagram to guide me there is no way to know for sure? I have heard of the CRT rejuvinators before and always thought that they were a band-aid repair, at best. Kinda like "snake oil"? I rated your reply "almost there" only because I couldn't perform the test as you described it with what you gave me to be completely sure one way or another. Frank

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Actually, your description indicates that the blue gun in the tube itself is shorting out. This happens when the set has been on for a while and the metal parts in the CRT guns have heated up and actually contact each other. If the video output transistor is bad then your screen would be blue right from the start. An easy way to prove it is to monitor the voltage of the blue pin on the picture tube socket. It should measure around 150 - 175 volts. When the screen starts going blue you will see that voltage drop dramatically. Quickly pull the CRT board off the picture tube while watching the voltage on the blue pin. If the voltage jumps back up the instant the socket is removed, your picture tube is bad. There are CRT rejuvinators that have the "remove short" function, but that has about a 50% chance of success and I usually find that the short will return a few months down the road.

Posted on Aug 05, 2007

  • Mike Longo
    Mike Longo Aug 06, 2007

    Look on the CRT board and the pins of the socket are labeled. The blue pin is usually labeled BK (blue cathode) or just B for blue
    there will also be RH, GK, 2 H pins (for heater), a G2 pin and a couple of G1 pins. Measure the one labeled B or BK. On most Sony tubes the 3 color pins are the 3 at the very top.

  • Mike Longo
    Mike Longo Aug 06, 2007

    I mean there will also be RK, GK, H, H, G2 and 3 labeled G1.

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I will not bore you with advice which you cannot follow. (90 % probability, looks like the Blue Signal Video Output Transistor has become faulty). This is a very simple "fixable' problem for a Professional Technician. Should not take more than 15-20 minutes.Nothing you can do. Call for Professional help.

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