Vertical Hold doesn't Hold

Entire picture slowly scolls up...followed by another then another and another... Never seems to hold where it should. Makes watching it very annoying! This happens with and without a DVD playing, or even in the player. Picutre starts to scroll soon after monitor power is turned on

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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.

Posted on Sep 19, 2007

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