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I have a 27 inch Sony Wega and Sony DVP-NS500V hooked up through component inputs.The problem started two nights ago, when I was fiddling with the PS of my DVD player. Whatever I did wrong, a loud buzz came out of my speakers and a slim moving horizontal band appeared from the bottome of my TV screen and slowly moved up. Also the display seemed a bit more crisp and "bluish." Thinking this was a sign of ground roop, I put back the PS was it was and had forgotten about it, as the DVD player sounded fine.
Today when I put in a DVD disk to watch a movie, however, I found out that the color was completely off. I was still getting a crisp and clear picture, but only in blue and yellow. No red signal was visible. I can force the picture to regain some Red by setting the "Color" menu all the way up and the "Hue" menu all the way into the red. But this is not natural Red and doesn't resolve the issue. I checked everything. I made sure the cables were correctly hooked up both ways, and tried different cables to make sure that the cables were fine in themselves (these are Belden 1505A terminated with Canare 75ohm RCAs). I also tried another DVD player and found out that it still showed the same blue-and-yellow picture.
So it seem the problem lies with the TV. Is it possible that only RED color can be missing while the picture itself is still clear and crips? It is not B&W but yellow and blue. Was there DC flowing off the component jacks? Did I fry anything inside the TV with that loud buzz? If I did, then shouldn't the entire component video section be dead? The TV otherwise functions normally except for this problem, and both the TV and the DVD player can display correct colors through S-Video input. My X-Box and VCR hooked to Video 1 and Video 3 are also funcitoning fine, displaying correct color.
I'm quite puzzled as to how to explain this weird phenomenon. This TV is out of warranty (2 years old), and I don't know how much it will cost to repair it, if it is a serious problem. If it is a serious problem, then I will just have to watch DVDs through a S-Video connection. Any insight into this bizzare incident would be greatly appreciated. Thank you very much.
Follow Ups:
The red line might have come adrift -> no red signal. Double check by feeding in a composite signal. If this is OK the TV is fine and there is a break somewhere on the red line, maybe in the socket on your TV.You did not mention about the picture on terrestial or cable. Again, if that is ok the fault is in the external red link. However if the red fault exists with normal TV there must be an internal fault which should not be hard to fix.
Relax, I'll be surprised if you caused any drastic damage or if a complex fault exists. Lack of red should be easy to fix. You might find you still have a warranty on the tube - you would be most unlucky if that has gone as it is a rare event these days.
John
Peace at AA
Thank you for your input, John. Everything else is ok on that TV, including cable, X-Box, VCR, even DVD players when connected through S-Video. So the problem is TV's RED component input jack.I couldn't understand what you meant by feeding "composite" signal, but I tried connecting DVD's composite output and the TV's RED COMPONENT input. Nothing. The picture is the same (clear and no distortion but just yellow and blue) without connecting the RED component jack, so I guess something is wrong inside the TV's RED component jack, whether it physically came loose or somehow got shocked.
What should I do to fix this one? It is already out of warranty, and I have some experience with solering. So if it is a loose connector that needs resoldering, I can handle that.
Many Thanks.
Sorry to be so long getting back to you but I've been away most of the day.Yes, I would take the back off (PLEASE make sure it is unplugged from the power) and have a look. The RCA socket might even need replacing. If you cannot see anything amiss then try to trace the lead to a board to see if you can locate a break. If not it might be an IC or some other component gone elsewhere.
You then have a choice -
1. Ignore the component input and only use the s-video
2. Take it to a competent technician. Ask around and double check on that one, particularly about SONY repair agents in your area. They might look like costing you more but ultimately might not if they are familiar with the product.
The composite input is the lowliest of the video lines and has a mix of all 3 colours. Generally not as good as s-video but a bit simpler. Most VCRs only have composite video out - the single RCA socket labelled "video in" or "video out". Most DVD players also have a composite video out.
Good luck
John
Peace at AA
I took a look inside. It is not the RCA jacks. They all checked out. I followed the signal path to a separate board with a few very large IC chips, and then couldn't figure out what went where. At least I made sure that the signal path is not the problem until reaching that board.
I also noticed that the red signal is present, but very weak compared to other two signals (Green and Blue). When I plug in only the Green cable, the picture is completely B&W. Then with the Red cable in the picture takes on a very faint red hue. Then with the Blue cable the picture turns into the yello-and-blue affair I've described earlier.I don't think I can fix this one myself, as it certainly is not a simple matter of faulty connection.
I will have to use the S-Video connection, but I'm not too pleased with that. I would still like to know how it is possible to arrive at this kind of condition, in that every single function in the TV is normal but the Red component input signal.
1) Have you tried changing around which physical cable hits which input, ie swap red and green cables at both the DVD player and the TV.So: Y - Red Cable, Pr - Green Cable, Pb - Blue Cable
This will determine whether the problem is with the red colored cable or not. You should lose picture if the Red colored cable is defective, or at least have a seriously screwed up one -- given that Y carries brightness information + sync.
If it is, you will need to replace the Red cable.
OTOH, if the Red input is screwed up, it is either the DVD player or the TV set.
2) Use a 2nd DVD player to test progressive out. If the problem goes away with known good cabling, you know the player is at fault.
3) If the problem still exists, it is the TV.
Regards,
Thank you for your reply. I've already done the testing you recommended, and I'm sure it's the TV. What I would still like to know is how it is possible to have just RED signal dead or significantly attenuated while every other function of the TV is normal. Well, another reason to ditch my TV and get a HDTV-ready model? ~_~
You either have a dieing red gun or a short circuit chewing up all the power that's supposed to be allocated to the red gun.Regards,
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