Question about Toshiba TP50G90 50" Rear Projection Television

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TP50G90-screen will fade to black and then instantly power back on every 8 seconds

I have TP50G90. when powered on the set will run fine except that every eight seconds it fades to black as if it were being turned off and then will instantly power back on. during this effect the power light remains on and there is no break in the sound. any ideas. thanks,

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Re: TP50G90-screen will fade to black and then instantly...

Power board problem needs a shop fix or new transformer without a test you cant tell.....

Posted on Aug 08, 2007

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I have an RCA HD52W59 TV that will turn on and picture is fine for awhile, then it will fade to total black. Still has sound and does not power off. Nothing will show on screen, not even menu options....

Thats a deflection problem which is causing the CRTs to shut down during deflection loss. The deflection board will need replacement. You can get replacement deflection boards from

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The best and the only solution to fix this problem is to call a tech and get it serviced or if it is still under warranty just get it replaced.

Few troubleshooting steps you can try:

1)Do a hard reset by unpluging all the cords for 4hrs and then plug it back.
2)The whacking test is to just bang or smack the set with your hand on the back, side, top, etc., to see if there are loose connections or cold solder joints inside that are acting up. If so, the banging should knock them back to normal and the set should restore. You might have to use some creative banging and some have had to put a book or magazine under one corner to torque the chassis enough to get it to work reliably.

Please don't forget to rate the solution

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Picture just went black. menu, inputs - nothing

Is the standby light blinking? If so how many times? It could help narrow down where the problem is. At this point it could be anywhere. Most likely in the high voltage section. Get me more info and I will try to help.


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sounds like something in the standby voltages most likely a regulator or leaky diode causing the problem.

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check your ribbon connections coming from power supply board there is 2 of them it will be the second one,theses ribbions connect to signal board.Sometimes causing set not to come on.

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No It is not the picture tube.
First, I would suspect a bad solder connection (cold solder connection) to find this problem hit the side cassing to see if the picuture goes away or comes back.
Another way is take the back cover off and tap gently on the boards with something not conductive or your hair would look like mine. The most commond section is power supply and neer the Horizontal flyback transformor.
The horizontal transformor look at it, it's a big greyish darty little thing about 3" x 4" and stand up about 4" with a big red wire going out of it. Don't touch it, it has very high voltages, just look what it done to my hair I'm telling you don't touch it along with it's red lead's. Just look to see if it is arking if so replace it.

When you have convegence problem , it is mis aligment of the colours in the genmentry aligments.
I would suspect more in the power supply section.


What about Bob
Timmins, Ontario
Home of Shania Twain.

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have you opened it upto see if there is any illumination from the projector need more info.....

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You need to call for service now that the unit still turns on,the problem will become expensive if you try to use it like this,right now the set might have loose conections in the power supply,horizontal driver transformer.ETC.Be safe and call a service tech.

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