When I am watching something it is in black and white. But when the video mute turns on it displays in blue and all of the menus display in full color. I have tried to run the cable straight into the tv and I also tried a digital camera in the 3rd input, all with no success.
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1 White Left Front Positive 2 Green Left Rear Positive 3 Violet Right Rear Positive 4 Grey Right Front Positive 5 Blue/White Amplifier Remote 6 Blue Antenna Remote 7 Red Accessory 12 Volts 8 Black Ground 9 White/Black Left Front Negative 10 Green/Black Left Rear Negative 11 Violet/Black Right Rear Negative 12 Grey/Black Right Front Negative 13 Sky Blue Telephone Mute 14 Orange/White Illumination 15 Not Used Not Used 16 Yellow Constant 12 Volts
If you turn all of the color out of the TV, the picture should be black and white. If that picture is not a true black and white picture, the TV will produce a color picture that has that behind it. It takes the proper mixture of red, green and blue light to produce white. This is something that is done inside the glass picture tube.
In your case, one color (blue is stronger) and the others are weaker.
It probably had not been used for a while. SOMETIMES, the weaker colors will get stronger with use. Adjust the brightness and picture controls to get the closest you can to a black and white picture, and then add the amount of color that seems right to you. Use the TV and hope for the best. It will improve, but 2%, 10%, or 50%; I do not know. The proper repair is to replace the glass picture tube, which is not an option at this time. So, turn it on, play games, and HOPE for the best.
Some inputs on tvs won't process the color signal. Try one of the other inputs. Mine does the same. If u have already used the working ones on something else, U will need a switch to select one or the other available at Radio Shack if u can find one.
Wow that's interesting, was there anybody watching your home while you were gone? There is a possibility that someone simply turned down the color level with the color control? Check that first. It's an unusual symptom. With composite video, component video or HDMI it's not usually possible to experience that defect. Since the color (chrominance signal) is usually inseparable from the luminance (black and white signal) I would check the color setting first. Other wise your set has become unable to detect that color signal... I bet it's a setting rather than a defect.
The route through the circuits in the TV from the various sources all lead to the final video amplifiers for red green and blue.
Somewhere along the route is a circuit called a colour switch. This allows colour if the signal is strong enough, otherwise it only allows black and white. This fault suggests a weak video chip which is the one just before the switch circuit. the fault could also be a faulty coupling capacitor to or from this chip, or a low power supply voltage. Check for dry soldered joints around this circiut.
Please note if resoldering on new televisions that they may have non leaded solder which requires about 50 degrees centigrade hotter iron.