This indicates that the TV somehow went into service mode, and the colors on your screen are a test pattern. There are a couple things that we can try to fix the issue.
The first, is to try and reset the EPROM in the TV.
To do this, remove the power cord from the wall, then press and hold the power button on the TV itself (not the remote) for 20 seconds. Then plug the set back in and power it up.
If this does not fix the issue, the last thing we can try on a user level, is to use the TV remote, and press Cursor Arrows UP then Down, and unplug power. Then plug it back in.
If this does not cure the issue, then this indicates a failure in the TV's EPROM which is what runs this Test/Service Mode, and there are no resets or adjustments you can perform to fix this. It is actually a fault in the component that generates this test, and the set would require service. There is nothing you can do that would enter the Service/Test Mode as a user, so this likely occurred due to hardware failure.
If your TV is still under warranty you can contact JVC from their service page for repairs below.
I hope this helps!
- Joe
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