Question about Samsung TXD1972 19" TV

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Tv screen goes black for a few seconds

I have a 20" samsung tv and the screen turns black for about 20 secs at a time until eventually it has turned black and will not come back??

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The currents are normally set on Presets near the tube driving amplifiers [spot by three identical power tranistors] give'em a clean wipe back and forth a few times and return to original posn. be careful not to get electrified, there's a really high voultage in tv circuits.

Posted on Mar 20, 2006

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Do you get sound while screen does black? what do you mean by "until eventually it has turned black and will not come back"? is it black from the minute you turn the tv on untill you turn it off? if sound is good but picture is black, it may be the resault of a fried monitor tube, in this case replacement will cost alot. if sound is dead also, them it is probobly power supply related issue. get out your DMM and measure the voltages in the power supply. When the screen goes black, is there still regulated B+ going to the circuitry? Do you still have HV? Is the filament of the CRT lit? Does the set still have a raster (you may have temporarily increase the screen setting to see it)? Do you measure any of the flyback derived B+ voltages that go to the video processing, tuner, Vertical Deflection, and other circuitry?

Posted on Mar 20, 2006

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