When using the PD-800 to play DVDs, the picture scrolls up as though there is no vertical hold. This is an intermittent problem, nearly constant with some DVDs, nearly absent with others, but I have this problem with all DVDs to some extent. With some DVDs, using the Zoom mode can sometimes stabilize the image.
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This problems u are having it is not the causes by the tv,because ur tv it is a analoge CRT tv,don't have this functions zooming in or out or the problems just causes only 8% cutting off edges of the tv pictures only.If the problem it is happening to ur analoge tv it will have no vertical hold at all.The devices u are connected to the tv and using have zoomming in or out buttons or ajustment buttons of the sizes of the picture on the screen.Used the devices remotes controls to readjust ur zooming or pictures sizes adjutment.
This would denote some kind of vertical sync problem. I would begin by checking the vert sync circuitry. To do this you will have to have an Oscilloscope, and DVD containing a steady-state picture. The oscilloscope is used to measure the vertical sync rate and the vertical sync pulses. Taking into mind that ther is a video signal present but it is in the black range. If you do not have an oscilloscope it makes troubleshooting this hard. in any event you will also need a schematic to see what waveforms you should be seeing.
If you do not have a background in electronics you may have to have someone who does look at this unit.