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In Reply to: Re: Double check your red component lead and TV input socket on the TV posted by dormant on May 12, 2002 at 06:48:23:
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
Follow Ups:
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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