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?

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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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1 Answer

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.

Feb 27, 2012 | RCA Televison & Video

1 Answer

I have a RCA 32 TV made in 2002 It shuts off and turn and nothing


If its a F32450 it is prone to two parts failing.

I presume you mean you turn it on and it shuts right off.

A question? I you unplug it and plug it back in do you hear a high pitched whine for a moment or longer/

This model (along with some others) has a problem where the High voltage Transformer fails.

It will usually take a transistor with it. I have fixed dozens of them and usually just need to replace two parts:


Transformer is location LL05 and part number is 257805.

Transistor is location TL02 and part number is 237470---generic number is 2SC5148.


The giveaway is if someone checks the transistor and it is shorted--the transformer got it.

I can tell you a place on EBAY that will have both parts for less than 30 dollars total.

Clearly, I do not know if you can do this repair--I do this for a living and replacing both parts in this set takes less than 20 minutes.

Let me know if you have questions and I will try to help you---

If this helped you at all rate this solution as I do this here for free.

SD TECH .

Dec 19, 2009 | RCA F32450 32" TV

1 Answer

Amp turns off when hot


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.

Sep 14, 2009 | AudioBahn A2601Q Car Audio Amplifier

1 Answer

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
have a nice day

Jul 18, 2009 | Televison & Video

2 Answers

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

May 16, 2009 | Philips 20PT91S 20" TV

1 Answer

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.

Jan 10, 2009 | Sylvania Televison & Video

1 Answer

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.

Dec 27, 2008 | RCA 32V550T 32" TV

1 Answer

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.

Dec 21, 2008 | RCA 32V550T 32" TV

1 Answer

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.


Dec 12, 2008 | Sony FD Trinitron WEGA KV-27HS420 27" TV

1 Answer

White Lines and Bright Screen


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

Dec 29, 2007 | Zenith SY2765S TV

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