Question about Toshiba 51H93 51" Rear Projection HDTV

1 Answer

Horizontal output transistor failure

The horizontal output transistor on my 51H93 TV has shorted several times, taking out the circuit fuse.

What could be causing this?

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  • JHD923 Apr 17, 2008

    Where could I obtain one of these mods?

  • JHD923 Apr 23, 2008

    Thanks, scott201201. Do you know of a third-party that would have information on these mods? I tried contacting Toshiba several times at several numbers, but they couldn't help me.

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Check b+ comming from p/s. also check for blue flat caps in line with h-output circuit. if blown out the side. remove them from circuit. also might have a HVT goin bad. I believe this is also the model that might have a mod for h-out running too hott that requires adding a resister in the h-drive circuit. also try a heavier duty h-output.

Posted on Apr 09, 2008

  • Scott Henderson
    Scott Henderson Apr 17, 2008

    i have only had to do one of them, but you can contact toshiba and talk to them, let them know that this is your problem and their tech know about it, and you would like the kit.

    or you can replace it with another h-output useing heat sync compound. but i would say use a stronger h-output.

    the right fix is the kit and i would ask to speak with tech support.

    if you can't get to them then ask for parts dept and have them look up your part number.

    good luck.

  • Scott Henderson
    Scott Henderson Apr 23, 2008

    http://www.tritronicsinc.com

    i think they have a kit for it, but to get the correct part number you may have to ask them. if they dont know get with me

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The set tries 3 times to come on (3 blinks) if there a problem such as a short, it will cycle without turning on. Unfortunately your set is notorious for having bad flyback transformers. Most likely the horizontal output transistor is shorted as well. Common causes for your symptom are: LL05 (horiz out transformer) RCA part# 257805; TL 02 ( horiz output transistor) 2SC5148; and open connections on the printed circuit board at LL 04 and L14401 (coils) all of which can cause the horizontal output transistor to be shorted.













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whenever fuse blows every time it is the indication of short circuit in tv. so please do not put fuse unless you know the cause of blowing fuse. these are the reasons of blowing fuse. 1 main filter cap.short. 2 rectifier diode short. 3 swithing transistor short 4 horizontal output transistor short 5 caps & diodes connected to flyback transformer short. 6 print short. 7 at last if every thing ok then flyback transformer defective. hope this will help. if you are not a tech person call skilled tech to fix it. good luck

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Your tv does not need a reset,what happened something went bad inside the set and it needs to be replaced,if you are familiar with tv service you can start by checking the horizontal output transistor for a short,if he went bad it likely made the fuse or safety resistor open.If you are not too familiar with tv service be safe and call for assistance froma servicer.If you decide to go in looking for problems make sure the set is not plug in.Let Us know how it goes or if you need more information.

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