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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Re: Turns on, but turns off again.

If you want to repair a tv set go to http://www.service 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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If this information told you something you did not know rate this solution as very helpful as I do this here for free.


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thats the classic symptom of a defective flyback. Its a easy inexspensive repair. change the flyback and the HOT transistor. You can get the new replacemnet flyback and HOT transistor at the following lkink with free tech support to explain step by step instructions to replace both parts. you need flyback 259296 and the HOT is 2SC5588.
Heres the link.

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do you get a flashing led if so how many times?

this is a post from someone else:
Thought I would report my finding with this set. Maybe someone else is experiencing the same problem.

The set would turn on with no picture. No high voltage - no raster. By turning up the volume, you can hear some noise in the speakers. This set has many fuses and they all checked out ok.

I located some schematics on the net for the previous generation set - 40H80/56H80. I could not find any site with the 50H82 schematics without paying. The 40H80 seemed to match the 50H82 fairly closely. I checked the horizontal output transistor with a scope and found no signal. I traced the signal back to a board on the signal schematic called the DPC module. No HOT signal was being generated by this module. Per the schematic, I checked the voltage supply pins at this module and found everything ok except pin 6 which is supposed to be +12V. I traced this back to the power supply connector and found voltage (pin3 of 8 on BB30). Since I got the set for free and I was feeling risky, I shorted the +12V at the connector to pin 6 on the DPC. I got a small spark and the set shutoff, but I could hear static which indicated that the HOT briefly same on. I shorted out the connection again and turned the set on. This time is powered up and came back to life. I've run the set for a couple days so far and it appears to be working great.

I may have gotten very lucky, or I may be shorting out something that is not supposed to be shorted. I would really appreciate it if someone who has the real 50H82 schematic could check the connection between DPC pin 6 and the power supply connector BB30. If this is a real connection, I have to assume that the trace burned out somewhere. It vias up and down all over the place and is very hard to follow.

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The unit is sensing a problem and thats why it turns itself off,if you are familiar with tv service you can check the output transistor for a short ,this is a good place to start,this will involve checking the component with a meter if is bad it will have to be replaced with the same type,if the transistor is changed and it fails again the set might also need the output transformer(flyback)all this checking has to be done with set unplug,if you are not too familiar with tv's be safe and call for assistance from a servicer this is the high voltage area and is dangerous.

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