My television is really dark. Commercials are usually viewed fine if there are a lot of colors, but during programs, faces are extremely dark almost black and the background is black. Please help. The television was given to me by a friend who told me of the problem, but I didn't realize how bad it was until we hooked it up. She said they had a repair man come and fix the power button and shortley thereafter the dark shadows appeared. Again, please help!
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Sounds like you're blessed to have a tv like that!
Some sets have settings that will cut down the sound during a commercial. Haveyou looked at your owner's manual? This tv may have setting to cut out the picture also when commercials come on.
From a technical view point generally commercials have stronger signals than regular programming. This may be overloading your set.
If this is the case, then you need to have it checked by good technician. A poorly operating power supply (not regulating properly) could possibly cause a problem like this. Also automatic gain control circuits could be not working properly.
Sounds like you've entered the "service mode" where you're seeing the chroma (color) signal only.
What type of connectors are the F and S? RCA? F?
This set is no longer made which makes it hard to research. By any chance, is there a small switch on the back that says "normal - service"?
You didn't say if you are receiving an off air picture or cable or satellite. The reason the commercials look good is because the local station (or source) transmits them "in the clear", that is, without any enhancements to the video signal. Network programing or local newscasts are sent through a device which inserts a reference signal in what's called the "vertical interval". You may have seen this as a series of flashing dots or pulses at the very top of the picture. There's a lot of information packed into the VITS (Vertcal Interval Test Signal). One of the lines contains a reference pulse for video which is set at a certain level. Your TV sees that level and automatically adjusts its circuitry accordingly. What I suspect is that your set is out of calibration and is pushing down the video signal because it is not "seeing" the level properly. A video alignment should correct this and can be done by a good repair facility. Hope this helps.