Question about Toshiba 50A61 50" Rear Projection Television

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Will not stay powered on.

Last December we had the television serviced. A high voltage component was replaced that had something to do with the color. This past April the TV would turn off at random intervals. We would have to unplug the set and wait a few minutes then we could turn it on again. After a few weeks of this it would turn off almost as quick as it would turn on. When it turns off the power light will blink. Unplugging does not resolve the problem. Is there an easy fix or should I get a new one?

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Re: Will not stay powered on.

Unplug the convergence yokes and see if set comes on DO NOT leave set on for longer than 2 minites with the plugs out presumming the set comes on, if it does replace 2 x STK 392-110 convergence ICs

Posted on Aug 31, 2007

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What do i do if my tv says code 21

somethings wrong with the high voltage circuits and its not allowing the tv to work -to protect you from xrays!

I would send it to a professional repair man or splash out and buy an LED or plasma screen. Don't fiddle with it yourself as the voltages concerned are very dangerous

Jan 08, 2012 | Mitsubishi WS-65807 65" Rear Projection...

2 Answers

High voltage want stay on

can you tell us what was the problem earlier and what all did you replace to solve it??

Aug 10, 2008 | Hitachi 53FDX20B 53" Rear Projection...

1 Answer

Error Code 2-2. (Low Voltage Supply) What now?

That is a power supply issue and this requires a skilled person to do it.Trouble shooting in this kind of problem includes voltage measurement and resistance reading of the components/parts inside the high voltage section This is not a DIY problem but if you still want to do it yourself then I can give you some guide that you can try.
1.Check the power supply board,this board is where the power cord is connected.The common problem on this circuit are the filter capacitors .A leak and shorted capacitors always cause that kind of problem the worse is dead set.To visually identify a defective capacitor is their appearance they look to be bulging on top blown,theirs a liquid leak on the body.replace the defective capacitor if you found any.with the same rating and value..
2.Resistors -change value resistors and open resistance can cause the same problem this resistors usually near the regulator transistor.They appears as burned and overheated replace it with the same rating there is an available color code calculator of resistor in the internet click this link and key in the color of the resistor to get the value..

3. check the voltage regulator transistor if it is shorted .the first pin and second pin must not have a reverse reading..

4.Check also the two big IC marked with STK xxxx this IC are the convergence IC it controls the horizontal pin of picture..when this IC are defective this will shut down the power supply ..

The steps I mentioned must be done with a skilled personnel If you feel you can do it,well you can try or better yet bring it to the service center or call a service this link for service center
good luck hope this helps!

Feb 06, 2011 | Mitsubishi VS-60705 60" Rear Projection...

1 Answer

Snowy color screen & have sound

On the back of th panel are list Vs, Va voltages. Find the test point on the power brd. Labeled on one of the connectors. See if voltages match. If they are slightly off find coresponding trimmers and adj. if way off disconnect x and y sustain boards from power board. if stays low then replaced power board. if it is normal with x,y disconnected then one of sustain boards. if voltages all ok suspect panel. ry checking other inuts first to see if this is a vseo problem or not.

Apr 22, 2009 | Projection Televisions

1 Answer

I have a WS-55805. Was working great, then suddenly no picture, just audio. When I press the Menu button, I get the menu but I see three separate colors for each menu item. Could this be the lamp, or...

This TV does not have a single lamp but a set of CRT tubes.

If you get menu displayed on wrong clors or colors are not matching then it is either a bad CRT, a bad CRT high voltage power board, or sometimes a problem with convergence board and convergence ICs, however in this last case you usually get no picture and no sound .

You can get service manual from link below:

Mitsubishi - CRT Projection Television - WS-55805 Service Manual

Apr 10, 2009 | Mitsubishi Projection Televisions

2 Answers

Blue color issue

can you replace the cable see if problem stay's or go's
if it comes back check for loose connection around that board.

Feb 07, 2008 | Toshiba 65HDX82 65" Rear Projection...

1 Answer

Tv problem

It sounds like you have High Voltage arc, coming from back of set. Was there ever Horzontal lines in picture when this happen. Or did your picture ever get dark and miss some color? If any of this happen then it could be coming from High Voltage Transformer, and anodes leads coming from trans.I would say clean spark gap anode leads and make sure all are seated properly(tighten). It would help if you could have the back open and notice when the set does this to see if you see sparks and were from. Hope this helps. Remember be carefull around any Voltage.

Sep 06, 2007 | Hitachi 43FDX15B 43" Rear Projection...

1 Answer

Light blinking...but not coming on

This looks like a problem with the H Voltage or switching power supply section of the TV set. What you need to do is to measure the voltage from the HV transformer to the Anodes of the CRTs with a high voltage probe, and check the voltage output of the switching power supply. What may have happened is a component may have shorted out causing an over-current condition with is triggering the shutdown circuit (These are the relays you are hearing). I would check the Horizontal Output transistor, and the components in that section of the TV.

In addition check the voltage test points on the HV / Horizontal and switching power supply board. This will determine if the section is working or not (most likely not). Make sure you have a schematic, and multimeter and a high voltage probe.
I hope this helps,
Thank you,

Sep 04, 2007 | Sony KP-46WT500 46" Rear Projection...

2 Answers

No power

The P56940 uses the PTK195 series chassis. The most common reason for that chassis not running is a shorted flyback (high voltage) tansformer. Sometimes a shorted flyback transformer will also cause the horizontal output transistor to short, and then the power supply will "chirp" when plugged in. The set should be serviced by a qualified tech familiar with the 195 series chassis.

Aug 27, 2007 | RCA P56940 56" Rear Projection Television

1 Answer

Rear projection tv wont stay on

It is a great chance Jeff that your Power Supply Board (specially the FlyBack) could not hold the voltage requirement to let your TV set on. When local Power Utility supplier is shutdown for whenever reason, this kind of situation occurs. Voltage spikes, voltage outage, voltage drop and dimming are common things. You could replace the FlyBack and then check out if the TV stays on. This will cost you from $60.00 to $80.00, but it will not guarantee that it was the only component that suffer the shutdown. I really suggest you to replace the main power board (from $175.00 to $250.00 - with core exchange). It is something you can do on your own and I'll recommend you to check on the following site (my favorite to buy parts): SithPitt

Jul 03, 2007 | Pioneer SD-P50A5-K 50" Rear Projection...

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