Jvc dvd xvn40

i would take it and get it serviced
i think the tape isnt running at quite the right speed perhaps a dirty bearing
usually if you get black and white from a colour video
then its either recorded in black and white or playing back black and white

so if you record then test it using a a vcr and a converter vhs tape box then you can see if its recording in black and white

then youll know its something too do with either the colour carrier etc component of the video its outputing

dont think its a dirty head
but you can clean it easy enough
i use a plain manila envilope and use the inside of its paper
the outside is smooth the inside is rough
its just right to clean the head drum
and some small lint free cloth to carefully clean the mecha
i use IPA isopropile alchohol {get from the chemist}

Cable damage is the first thing to check. If the cable is external this is an easy check by trying a new one. Otherwise it is probably internal cable damage or damage to the video output plug.

Different areas use different colour systems. The most common types being PAL and NTSC. What I think you might have done is changed the colour type setting to one that is not compatible with your TV. If you have the manual look up the colour settings. If you haven't got the manual look around the main menu for them. If all else fails use the factory reset.

Check the av channel on the tv,the av is normaly av2,if it say`s any different then press the av button on the tv r/c until it plays in colour

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.

I too had the same problem. On the Vzio there are AV plug ins on the left side (not the back, but the left side). Use these jacks when connecting to the DVD player and choose the AV button on the TV remote. Viola!

is the sony log is alos B& W

Check your DVD or Video player manual for regional setting, you may simply be set to the wrong region. Some players have a regional button on the remote control.

Regional settings allow DVD's or Videos to be played on the same player by simply selecting the correct regional setting.

If you are on the wrong regional setting, your picture will most likely appear in black and white.

Same problem with an older JVC player. One end of the S-video cable was loose. Pushed in in tight and everything ok again. Cheap fix if it works for you.

Hi mozdec you was with me on live session just a while ago however sorry for losing our chat session look for a button on the remote that says NTSC push down that button this will change the mode of your DVD player to color you must have accidentally push that button.good luck