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First if cable I presume you have entered the menu and selected cable.
Another possible reason is the tuner/s in this set are bad---hook a DVD or something to one of the rear inputs and see if set works.
If set works that way and tuner turns out to be bad you can with a box with av cable out connections on back just go into a rear input and bypass the tuner--leave set on that input and change channels with the box.
Let me know if you have questions and what you find---usually on this set if no signal---"unusable signal" will appear on screen if no signal.
I don't know which receiver you have but, I can give you a basic idea. You need RCA cables Yellow for Video, Red and White for Audio. You may not need to connect the Yellow cable for the Video again, it depends on the receiver you're using. Basically, to get the TV sound from your Surround system, you only need the white and Red RCA cables. Connect one side of the RCA cable white & Red to the receiver (IN) and the other side of the RCA Cable to the TV or cable box (out) You need to select the source on the receiver, AUX or Video.
I could help better if I knew which receiver, if you're using a cable box and how are you getting TV signal? do you select CH 3 or AV to watch TV?
Best of luck to you. AAA TV SERVICE www.aaatvservice.com
dterminal5 - It sounds to me like the rca inputs are cracked on the pc board, I don't know if you are technical or not ,but it is an easy solder job to fix. Try this and let me know how you make out. cooltek Feb.29/08
RCA can be reached by phone at 877-794-7977. Hours are 8AM - 8PM Monday - Friday EST and 10AM - 7PM EST on weekends.
If you are under warrenty they will know. If so, ask them where the nearest RCA authorized repair shop is.
Are the yellow, red & white cables RCA phono plugs?
Yellow = Video
Red = Right Audio
White = Left Audio (mono)
The red, blue & green cables are for picture only and don't include sound. Have you tried using the red, blue & green for the picture and using the other cable, red & white for just the sound? Don't use the yellow.
Sounds that this might be the proverbial problem some brands have, specially RCA (funny this problem still exists. It was around even when I was a resident engineer for RCA Corp. 20 years ago and hasn't been modified). This problem relates to the tuner assembly. It is a relatively easy fix for a skilled technical person. The cost of repairing it shouldn't even be close to its replacement value, so, in my opinion, worth fixing. Since I do not know the model or age of your TV set (or the inclination you might have to take this as an excuse to get a new HDTV set - LOL), it is entirely your call!! Hope this helps. Let me know.