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In Reply to: Need help with system setup (Tivo, VCR, DVD, OLD tv) posted by sjarvis on January 19, 2002 at 15:19:47:
I'm using a 10 year old plus monitor TV too for now. How's your TV with regular cable or antenna signals? Without seeing things or knowing more, it almost sound like your TV's AGC circuit has problems i.e. the common device, since you get it from both video players. Ummm, your problem videotapes and DVD's are legit, are they? Macrovision and some other silly schemes work by screwing up AGC too, but usually much worse than you describe.
Follow Ups:
The TV is fine with just the cable signal, even when routed through the VCR and/or the TiVo. All the videocassettes and DVDs are legit.The effect looks a lot like someone is slowing pushing up the brightness and/or contrast then turning it down, then slowly back up, etc. I didn't realize until today that it only occurs with some videotapes. But, it happens with all the DVDs I've tried (about seven).
DVD Players enforce copy protection through macrovision. If you connect the DVD player to a VCR, the VCR will not copy the movie properly. If you connect the DVD player directly to the TV, macrovision is not a problem and the picture is clear. You need to try connecting the DVD directly to the TV to determine if you are having a real problem or you are just bumping into the DVD macrovision protection..
...Paul
Hi Paul, He did mention a "stripped" setup with just the DVDP and TV. I missed it the first time I responded, but later noticed and deleted/changed my post. When there's a MV problem, the change is more rapid, and that's sort of how it works, by being too fast for VCR AGC circuitry to respond to, at least most VCR's (!).
Right, I've tried it with just the DVD to the TV, and still have the problem.
I need help to find out whether i can burn my DVD's onto a VHS does anybody know how to? HELP me PLEASE!!! To answer me just e-mail me @ BTSFJTZ@aol.com. Thanx
It still sounds like a video-AGC amplifier issue, since its operation is strictly dependent on *video content*. It will make things go dark and bright depending on how it adjusts the signal. There is an RF-AGC amp too, and that is OK since your antenna signals aren't affected, they're adequately taken care of before they hit the video-AGC.Tough to do things like this without seeing for myself. The first thing to do is to isolate the problem to the component. That usually means using known good components/swapping, in your case I'd say hooking up your DVDP to another TV that works fine. I'm pretty sure the problem is your TV from what you've tried and said, but you will have to convince yourself before you consider other action.
Suppose you try another TV and become sure that's the culprit. I don't know if you do DIY, but even if you don't and just want to try a stab at diagnosing the problem to see if it's worth fixing (probably is if it's just video-AGC): go and get the sci.electronic.repair TV FAQ. Sorry, I don't know where it is these days, but a search should easily find it. This, and all their other FAQ's, are excellent and will allow you to narrow the problem down very accurately - like for a car, it's REALLY good to know what's wrong before you take it in for sevicing. Consumer TV's are notorious for their very poor soldering, a major cause of many problems. When the service guy replaces a part, guess what? Now the TV works, often because of new solder joints on the new part, there was nothing wrong with the old part. For instance, flakey solder joints can become temperature sensitive, as they get hot they stop working, so then they cool down, and then they start working again, giving a cyclic effect of the problem coming and going. This can happen to any part actually, but TV solder joints are famous for doing it.
All this speculation doesn't help much, so take your DVDP to a friend's house or a store (say you're looking for a new TV, you might well be) and find out for sure.
thanks for all the help. I'll try the DVDP with a friend's TV this week and report back with the results.Thanks again,
Steven
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