Jvc av-36s33 tv , Was using a vcr fast forward to advance film when on the lower screen of the tv a mode of letters and numbers appeared, I then pressed the volume control and the numbers advanced a few digets color changed to black and white and info left screen the picture stayed black and white. All picture controls have no effect. Please help, Thanks
First, confirm that the source is actually in color - try another channel
or input device.
Next, check the settings of the color control - it may have accidentally
been turned down. If your TV has some kind of automatic picture mode,
try turning if off and adjusting the color control. Try adjusting fine
tuning if you have such a control and the problem is with a broadcast
or cable
transmission.
At this point with a confirmed color signal source, there is a problem
with the chroma circuitry.
Note that to the average person, the obvious question becomes: is my color
picture tube bad? The answer is a definitive NO. It is virtually impossible
for a defective CRT to cause a total loss of color. A defective CRT can
cause a lack of a primary color - R, G, or, B or a short between two colors
which will mess up the color but is not likely to result in a black and white
picture.
Some possibilities in no particular order:
A service manual or Sams', DMM, and scope will help greatly in attempting to
troubleshoot this unless it is an obvious bad connection. Try prodding
the main board around the chroma chip with an insulated tool to see if
you can make the color come and go.
I had one set where a $.02 resistor decided to open up causing just this
problem - perfect BW picture, no color. Another had a coil with a broken wire.
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.
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you need to read how it occurred, it's a maintenance adjustment.
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