My TV worked fine one night. The next morning I turned it on and in the middle of the screen was a thin line of bright wave like colors. I could still here the sound but couldn't get the picture back. There was no sign of problems prior. I just turned it off before going to bed and than back on in the a.m. Please help!!!!! Its football season and this is my bigscreen.
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If the screen is too dark on the TV or the brightness keeps on continuing to change then the problem here is with the Energy Saving mode settings. By default the TV does set the Energy Saving to Auto, which means that the TV will automatically by it's self does adjust the screen brightness depending on the brightness of light it detects.
I have worked on projection displays for about 17 years 20years electronic. and this sounds like a vertical deflection amplifier problem. this is if the lines or the rainbow you said that you see are horizantal.
this symptom, sometimes called the tube light effect, it is characterised by a bright thin horizontal line across the middle of the screen. this symptom is caused by a breakdown in the vertical deflection circuit. hence maybe the trouble maybe in the vertical oscillator, amplifier or output circuits. but if all i have said is not clear to you, better bring it to a qualified tv technician. good luck!