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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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ghostly lines running across my sony tv screen, advice appreciated!
Hi
Can anyone help? I own a 36inch Sony widescreen tv, and a Pioneer 565A dvd player. When I play a dvd on the tv, a ghostly vertical strip runs constantly from the right to the left of the screen. It makes watching dvds very hard as it is so distracting. I have tried a different dvd player, but the same thing happens. I have tried using s video and scart, but both produce the same problem. It seem that the problem lies in how my tv is dealing with the dvd signal. It looks like some kind of interference, but how could this be? I would be very grateful for any suggestions, as I am really at my wit's end as to what it could be. I should mention that these ghostly lines do not appear on my picture for sky tv, or video consoles, or terrestrial tv pictures. TIA Godfrey |
#2
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ghostly lines running across my sony tv screen, advice appreciated!
Internally, in the circuit that switches the signal sources there may not be
proper isolation. You may be seeing the sync signals from the DVD video and some other video crossing a bit. The result would be that you are seeing the free running of the sync pulses from the other video source that is entering the set. This is knows as cross-talk if this is the fault that your set actually has. Some of the causes are a cold solder connection to the reference ground point for the video, defective components(s) such as maybe the main input switching IC, the input isolation amplifier stage, or anything else along the path of the input processing of the video. A TV tech would be able to find this by scoping through, and looking at the waveforms to see where the signal leakage or crossing is occurring. Then he would be able to troubleshoot for the defective parts. You can also try to disconnect everything else from the TV set including the cable, and only have the DVD player connected. You will most likely not see this effect anymore, thus proving that this is an input cross-talk problem. If you see very faint snow in the background this would be the tuner section that is crossing through. -- Greetings, Jerry Greenberg GLG Technologies GLG ========================================= WebPage http://www.zoom-one.com Electronics http://www.zoom-one.com/electron.htm ========================================= "godfrey" wrote in message om... Hi Can anyone help? I own a 36inch Sony widescreen tv, and a Pioneer 565A dvd player. When I play a dvd on the tv, a ghostly vertical strip runs constantly from the right to the left of the screen. It makes watching dvds very hard as it is so distracting. I have tried a different dvd player, but the same thing happens. I have tried using s video and scart, but both produce the same problem. It seem that the problem lies in how my tv is dealing with the dvd signal. It looks like some kind of interference, but how could this be? I would be very grateful for any suggestions, as I am really at my wit's end as to what it could be. I should mention that these ghostly lines do not appear on my picture for sky tv, or video consoles, or terrestrial tv pictures. TIA Godfrey |
#3
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ghostly lines running across my sony tv screen, advice appreciated!
Jerry,
Many thanks for your detailed and most thoughtful response. I tried what you suggested, that is, remove all inputs except the dvd one. However, the ghostly white line still flits across the screen. It is time I got an expert out to have a look? TIA, Godfrey |
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