Question about Toshiba 32AF45 32" TV

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TV turn off by itself

I have a toshiba model # 32af45 and is turning off by itself, i check the Horizontal Output Transistor out i want to know what will be the measure between base, collector, emisor.

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  • grseaton Dec 21, 2008

    toshiba 32af45c turning off by itself

  • SatchMan1000 Mar 02, 2009

    I have the same problem. (Toshiba 32AF45 TV) SD. It started about 3 days ago. The set itself is about 3 years old. I unplugged the surge protector. Note that we have cable with DVR service and this is only an SD model. The first time it happened I just rebooted the cable box. The second time (3 days later) I unplugged everything, turning off the Surge Protector for several seconds and plugged the TV into a different outlet in the surge protector. The surge protector is a Monster Cable unit several years old that we paid $60 for. Wonder if this is something in the line? The surge protector? Or the TV? The TV itself other than this problem works like new! Picture and sound are great.

  • pricelyle Apr 07, 2009

    Ours is also turning itself off constantly. How much do you think a repair would cost?

  • SatchMan1000 Apr 09, 2009

    This is in response to PriceLyle,

    We seem to share the same issue with our Toshiba SD TV's turning off. The best description is that the TV will do this usually within 1-3 minutes of being turned on. Than after the set does its unexpected turn off, you have to turn it on again anywhere from 1-2 additional times during that 3 minute "wait and see if it stays on period." After the set has been on for three minutes it stays on and acts normal. On the next turn on, it's a guessing game as to whether or not it will act OK for those first 3 minutes.

    There is no known duration for how long or short a time the set may be off as to why this occurs, Sometimes, the TV WILL stay on and act normal, but most of the time, I get the situation described above.

    Sad but true, the life expectancy of most electronics is about 3-5 years before an issue can occur. (My parents had a Toshiba TV in the 1970's that lasted for over 15 years!) Obviously, those days are long gone. I've learned over the years that repair rates for any electronic service call can range with the lowest price about $125-$200 or more. If this repair cost was like $50, I'd consider having it done. But that $50 cost nowadays would barely cover a truck trip without them doing anything. How old is your Toshiba? Mine is just under 3 years old, and the issue started about 5 weeks ago.

    And it's almost like what ever is doing this is some little stupid $1.50 surplus chip in the set that is not generating the proper temperature for it to stay on, until enough heat builds up for it to do so. (i.e in the old days, this would be described as the set needing to "Warm Up.") With today's economy, I don't really want to have to buy a new set over such a little thing. But the problem is annoying as hell!

    I don't know what to do? I mean fix it before it gets worse? Live with it and see what happens over time? I will try to keep you posted.



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Tv turns off quite often even after turning on several times seems to do it more with a brighter picture or bright flashes

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The easiest way to describe this is to measure the center pin to either outer pin. If either combination reads shorted, that is the problem.


Posted on Sep 03, 2008

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Check and replace damaged component/s at its horizontal scan output section circuit. Check the LOT (Line Output Transformer) too for damage. Replace the horizontal scan output transistor. Check the input voltage to LOT. If the voltage is absent check the feeder resistor; if any. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts.

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Check to see if horizontal output is shorted, But will have a damper diode, between the base and emmitter, will read 0 ohms. That's okay to check like that, Check for shorts between collector and emitter and collector and base. If ok, check for 130v dc on the collector of the horizontal output transistor.

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Tv will not turn on

First, locate the horizontal output transistor. This is found very close to, or next to, the horizontal output transformer (also known as the flyback). The flyback should be on an aluminum heat sink, or on the side of the metal chassis. Disconnect or unsolder two of the three legs of the transistor. Measure it with your meter, or plug in the set with the light bulb attached across the fuse.
If the transistor is shorted, or the light bulb doesn’t glow bright anymore, replace the transistor and plug back in. If the light bulb glows bright again, you must replace both the flyback and horizontal output transistor simultaneously. In some cases this will fix the set, but sometimes there are multiple problems with a set.
Go to where the flyback is, and start measuring the diodes and capacitors on the flyback itself. If you don't find any shorts there, it could be a shorted vertical output IC, a shorted sound IC, a shorted disc capacitor in the Hi Voltage/sweep circuit, or in rare cases, a shorted capacitor or tuner.Feel free to ask and post whatever the result of your troubleshooting..

Hope this may help;



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