Question about Televison & Video
Alright, this problem is called hum or more correctly 60Hz-120Hz Hum it is caused by a partially open or an open filter capacitor in the power supply of the TV. The filter capacitor's job
is to filter out the 60Hz - 120Hz ripple voltage that is present on the
power supply's output.
When this cap fails the hum bleeds into the various stages and causes the lines that you are seeing on the video screen. To troubleshoot this problem you will need a schematic diagram (to locate the power supply test points and to get pictures of the correct waveforms that should be present), a signal generator (to generate a reference signal), and an Oscilloscope (to view the waveforms at the test points). What you will be looking at are the outputs of the power supply checking to see the level of the ripple voltage present on the outputs.
If you do not have the tools needed or any knowledge of working on electronics, then I would suggest getting a qualified repairman to fix this problem and the cheapest way is to take it in and not have them come out.
Let me know if you have any further questions on this problem
Posted on Apr 29, 2008
It looks like the TV might have retrace lines that are cause by a defective video amplifier IC, couple of fuse resistors burnt.
You might be able to make an adjustment to the blue screen voltage by reducing it slightly to get rid of the lines.
The devices that you connect to the TV have a different output and the TV is very sensitive to the higher video outputs from the DVD or any other device that you connect using the AV inputs.
Let me know if you need more assistance.
Posted on Apr 29, 2008
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Posted on Jan 02, 2017
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