Question about Sanyo DS31520 31" TV

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Funny half screen problem

I do not know the origin of the problem, but my television has been working great until recently. Now when I turn my television on I can only see the upper half of the screen and the shapes are distorted (people appear to be like midgets). The bottom half is black. The wierd part is that the upper half gradually gets bigger and bigger pushing down the black part and over maybe about 45 minutes I am able to watch the TV full screen or maybe with a half-inch left on the bottom. What is happening and is there a way (ie setting to change) to fix this?

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  • twistedt Nov 12, 2007

    My problem is almost the same. I turn on the tv and it has sound but only half of the screen for about 5 seconds then it is gone. It did have sound but now it doesn't. I looked for bad solder joints but unable to locate any. Does any one have an idea where I should start?



    Thanks

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Nope, Sorry to tell you, there is most likly a coupling capacitor or the vertical sweep IC itself could be defective. Although if you have had some sort of solid state Printed circuit board training, this should not be to hard to find, with a can of freeze spray. Unfortanatly this set has no user replacable parts inside of it, as everything is soldered into place and there is no easy fix. Although depending on how old the set is, is going, Im sure, to determine if you want to invest any cash into this thing. Without any training it would be a crapshoot Im afraid! So stay safe and seek the assistance of a pro. Good Luck Please do not forget to rate this!

Posted on Oct 16, 2006

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The coupling capacitor techman mentions is probably one in series with the frame scan coils which may be leaky. There are probably several components in the frame output circuit which are to shape the current waveform to an `s' shape, to give a linear scan down the tube face. slight changes in these components with temperature will affect the linearity of the vertical scan. There may be small adjustable potentiometers to set, but be sure you know the right ones. A meter on ohms may be useful to check all these components. I do not think it is the chip. There may be poor soldered joints.

Posted on Oct 16, 2006

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