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there is a circuit in the color section to put the tv to black and white if the color subcarrier is missing from the broadcast signal.
it is called a color killer and needs to be adjusted.
it is for a technician to do.
it operates off the 3.58mhz color subcarrier.
This is because of the audio video format issue. You select the TV type to auto (Advisable) or to the appropriate selection such as PAL or NTSC in the DVD player to get the better output with the color. This selection you usually find in settings > Video setup> TV Type
for the black and white screen output of your DVD and VCR.
1) for DVD player: using remote control locate "setup" button and click.a dialogue box should appear indicating " audio setup" video setup" etc..... 2) select and scroll to "video setup". in video setup there should be an option to choose "AUTO" "PAL" or "NTSC" 3) choose "auto" then check if any change in screen color.
for VCR, locate a switch or button indicating "PAL" "Auto""PAL SECAM" "NTSC". same with the dvd choose and select "auto"
note: if you still have the manual for both VCR and DVD check the instruction with regards to video color setting.
A cable could cause this problem. I would try using a standard RCA patch cable and go from the composite video output of the DVD player to a composite video input of the TV. See if that produces color. If not, the DVD may be at fault. On the other hand, if you get normal color, the S-video cable could be bad.
Since you're using a composite cable (yellow RCA) that carries both luma (brightness) and chroma (color) information, it's not the cable that is the problem.
That means it's either the DVD player itself, or the TV. If you have another video device (VCR, etc) that you can connect to the TV, try that. If the other device also goes from color to black and white, then it's your TV. Otherwise the problem is your DVD player.
Since your TV only has mono audio (white RCA, but no red) I would recommend getting a new TV if the TV is to blame.
if you are using S-video cables for your video, try replacing the cable. svideo has 2 lines in it, one for color (chroma) and another for brightness (or black and white-ness (lumina)
if one of those little pins is broke, or missing, or the cable is bad, this may be the case.