Mitsubishi WS-55857 55" Rear Projection Television Logo

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Question about Mitsubishi WS-55857 55" Rear Projection Television

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Turns on, but turns off again.

Can someone tell me the location of the HOT transistors, and the Q numbers? Any other ideal on where short might be?

Posted by John Darby on

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If you want to repair a tv set go to http://www.service manuals.net and download the schematic diagram. you will get all the info on the schematic if you can or have the training to read one.

Posted on Sep 24, 2006

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My RCA tv every once in a while turns itself off and on until it's unplugged. How do I fix that from happening?

Hello
There is some shorted components on the main board to your tV. Just check its horizontal output transistor for collector to emitter leak. Just desolder this transistor out from the baord, and switch ON the TV. If the power supply indicator light lights up steadly, make sure that this transistor is shorted. Before replacing this transistor, LOT must be suspected. if LOT has internal winding short, this faull will happen again.
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Bad connection , when the solder become old , the bad connection result from that , when the equipment works and some parts become hot and the solder where bad connections are open when it become cool the solder come back together again....
search someone who knows how to do the soldering and use soldering iron to help you locate where the bad connection are located and to do a ggod solder for you.
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TV Turns off.

iam providing here a generic solution for ur problem as u ve not specified the make or model number of ur tv...
Sounds like a common problem where the Horizontal Output Transistor shorts due to heat, loading by a partially shorted flyback or yoke or old dried heat sink compound. If the HOT is ok then there is probably a short in another component. This can be determined in most cases by isolating each module one at a time. In other words disconnect the audio circuit and try
If no shorts are determined check the power supply for proper output voltages. All this would need to be done by a tech or someone familiar with the process. Repair cost should not be that much compared to the cost of a new set. so u have no reason to worry....

thank you for using fixya
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Problems with on/off button

Your Problem is the Hot transistor, it is short circuit. Causing the tv to go into protection. I f you say this is the second time the same problem tell the technician who works on the tv to replace all the caps on the collector of the Transistor and check the lopt transformer causing the HOT transisistor to fail thank you
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Tv screen is normal, then green then off. Please help

It can be one of two items. The green output transistor or the green cathode has developed a short.
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RCA32V434T

Hello,
The Horizontal Output transistor needs to be changed as it is most likely shorted. The current transistor on this set is a 2SD3402 (no longer available) it's new replacement part number is the 2SC5902.
Order 2 2SC5902 Horiz Output transistors.Replace the transistor by it self once and if all is ok then fine.
If not replace it again and also the the Flyback HV transformer. The HOT transistor is probably shorted again and the transformer is causing it.
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My tv has no picture or sound. it makes a sound like its about toi come on but it doesn't. a red light just flashes

The Horizontal Output transistor needs to be changed as it is most likely shorted. The current transistor on this set is a 2SD3402 (no longer available) it's new replacement part number is the 2SC5902.
Order 2 2SC5902 Horiz Output transistors.Replace the transistor by it self once and if all is ok then fine.
If not replace it again and also the the Flyback HV transformer. The HOT transistor is probably shorted again and the transformer is causing it.
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Sony Vega Service Codes

KV-32HS510 and KV-27HS420, seven times blink error code shows problem in Horizontal deflection circuit.

There are many possibilities like dry solder joints, weak capacitors, Horizontal transistor short or flyback transformer fried etc.

If you have little experience of TV repair and good solder skills and have necessary tools to test / check defective parts, then you can make it. you also need to have related service manual to see board location, schematics and part numbers.


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I believe you have a shorted transistor on the crt board on the back of the picture tube which should be Q5104. Let me tell you my experience with these Zenith's The original problem is the picture tube shorting out and caused this problem. If you replace the transistor the same problem could arise again because of the tube and it could even knock out the main board power supply. I have seen this happen. And I have put in the transistor and no problem. You can get one at the Radio Shack by taking the bad one out and get them to cross reference it for you. All Zenith transistors have a prefix number (not on the transistor) which is 121- (with the dash!) and the number on the transistor The new one must go back in the way it came out! I recommend someone with electronic soldering and desoldering experience. Hope this helps
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The F27442 uses the CTC203 series chassis and that symptom is very common. If the horizontal output is shorted you MUST resolder the coil in series with the base of that transistor and the pins of the small horizontal drive transformer. When they have been properly resoldered you can put in a new original horizontal output transistor. If the output transistor shorts out again then your flyback (high voltage) transformer is shorted and needs to be replaced.
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