My JVC AV-27S33 is seet up for English but occasionally playing shows in Spanish when all other TV's playing in English and the commercials during the show playing in English. Don't understand why?

Did you try going to settings , scroll down untill you see the solitaire app and click on the solitaire app thing and see what you can change?

Check its color system adjustments. It will be best to make a factory reset to this set. Just unplug the TV from AC mains wall socket, and re-plug it after 10 minutes of so. This must make your TV a hard reset. If this do not help you, the chroma section circuits of your TV need to be checked for fault/s. This is a skilled work, and it will be best to contact any experienced service technician.

a problem with the microprocessor which has its programmes corrupted

Hello
Just make the picture status button on the remote control and get the display setting to its factory mode.

The VIDEO STATUS button gives you a choice of three TV picture display settings, including a
display of your own preferences.
Standard - Resets the picture display to the factory settings.
Dynamic - Heightens contrast.
Theater - Gives a rich, film-like look to video. (AV-27D303, AV-27D203 and AV-20D303 only)
Sports - When you watch a sports program. (AV-27330, AV-27320 and AV-27S33 only)
Press the VIDEO STATUS button repetedly to get these choices.

I have the AV-27S33 model and in the rear to the right of the inputs are two slits and inside these slits are two screws. The top screw is the focus,the bottom the brightness.Your tv is a different model but it may have this same adjustment,if it does try turning the bottom screw to the right to increase the brightness.

Make sure your TV hasn't been set for SAP (you'll find it in the audio settings menu). Second audio programming is often used to carry alternate languages, and if it's turned on you won't know it until you watch a program where it's being used. There may be a single button labeled SAP on the remote. If so, it's easy to change the TV setting without realizing it.

http://www.retrevo.com/support/JVC-AV-27D305%2FS-TVs-manual/id/317ag105/t/2/

TRY DOWNLOADING THE MANUAL AND SEE IF IT HELPS

I've found several bad solder joints on the neck board of my JVC 32' leading to the exact same issues as yours. Inspect the Driver resistor solder on the neck board.

Have you move the tv or is there a speaker that you might have move close by the tv?

turn the tv off for an hour and turn it back on see if the degaussing can correct ir other wise it may have a bad connect on the degaussing or you have some kind of magnetic device close by.,

Some TV's have tuners that do a better job of rejecting interference than others. Unfortunately, there is not much you can do about it, other than to identify and eliminate the source of interference.