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

Posted on Mar 10, 2011

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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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1 Answer

I have a Toshiba TV that turns itself off, and the red power button flahes. Then I unplug it, plug it back in and it starts. However now, when I do this, it starts for 2 seconds and turns off. TIme

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.

Sep 07, 2014 | Toshiba 32A33 32" TV

1 Answer

What's your problem?the tv won't turn on i check thehorizontal trans and its fine i check the power and everything but nothing

Check the horizontal driver transformer. Measure the frequency at the base of horizontal output transistor. It should be around 15.6 KHz. If there is no frequency measured at this point, horizontal driver transformer, horizontal driver transistor, and horizontal oscillator section should be troubleshooted.

Mar 22, 2012 | Panasonic CT-32SL14 32" TV

1 Answer

HOT transistor TT 2222burn after second replace. TV Samsung Model CS-21Z45MJ

Before replacing an other one, replace the freewheeling capacitor, the capcitor fitted between the collector of the 2222 and earth; usually of a value of 3500pf 2000VDC, some times this value may differ from set to set. If this capacitor has opened of developed in value, the result will be the failure of the horizontal output transistor, at switch ON itself. The second reason is the short in horizontal yoke windings. Even one winding get shorted, it will cause to a heavy load flyback transormer which in turn to 2222 failure. The last reason for this fault is defective Line Output Transformer itsef. Check these three.
Before proceeding, desolder out the horizontal output transistor 2222 fro circuit, and measure the frequency at the collector point of horizontal driver transistor. It should be around 15625HZ [may differ a little], with no signal. If this frequency is found higher than normal, The main IC jungle should be suspected.
Anyway, go forward after checking this frequency. OK.

Jun 10, 2011 | Televison & Video

1 Answer

Toshiba tv 32a43 power button flashes red and won't turn on

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.

Mar 26, 2011 | Toshiba 32A43 32" TV

2 Answers

Sharp tv primo 21`inch turn on red light only

check your horizontal transistor maybe it's shorted replace horizontal transistor or maybe the fusible fuses are open check for open resistors at the horizontal section of the circuit.

Dec 22, 2010 | Sharp Televison & Video

1 Answer

Toshiba crt tv clicks when I try to turn it on

Mostly horizontal output section got problem in crt tv, check horizontal output transistor and replace it if found shorted.
Let me know model number of tv to look for related schematics for more info.

Dec 17, 2010 | Toshiba Televison & Video

1 Answer

Hi My toshiba CX36H60 has a problem -- no picture but sound is good. what could be the issue and how to rectify it. Please suggest.

As sound output is ok, main board is correct with respect to sound output, video IF and ther stages. The fault lies on the horizontal output section. It may be LOT fault. Check it further for horizontal oscillator stage, and horizontal output stage. Check the collector voltage at the horizontal driver transistor. If you have a frequency meter, check the frequency of that point. It should be somewhere near 15625Hz. If the frequency there is Ok, then proceed to horizontal output stage. Check the horizontal output transistor. If it seems to be faulty, replace it with similar type and number. If the replaced horizontal output transistor heats abnormally within seconds after swich on the set, surely LOT has troubel. Replace it also with same model mumber and type.

Oct 16, 2010 | Toshiba CX36H60 TV

1 Answer

Our television automatically turned off right after we turned it on and it won't power up anymore. Is there anything I can do?

if the power indicator lamp lights on, but in stand-by mode. it signifies the power regulators are still working but the problem is in the horizontal section. you should check the horizontal output, or drive, range from transistor horizontal output and IC horizontal drive and if damaged must be replaced. if the indicator lights do not light on at all, you should check the power regulator such as transistor regulator. for more detail how to measure the Voltage on TV you can see in my Blog here :

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