JVC projection TV (av-56wp30) intermittently loses picture

[Jeff]

We had the TV for about 3 and half years. Recently, after it powers up,
either the picture is perfectly normal, or you'll see nothing but solid
green flickering on the top 2/3 of the screen, the bottom of the screen
is black, with an arch shaped bordering between the two. When the
latter happens, seems like only the green gun is working to produce a
solid green, no picture. A Sears repairman came out, but didn't find
anything. He suspected there is a loose connection somewhere on the
signal board since the problem is intermittent. Any insight is
appreciated.

 

[Dani]

You MAY have a bad CRT, unplug the green to see if the unit will
stay on. Dani.

 

[David Naylor]

We had the TV for about 3 and half years. Recently, after it powers up,
either the picture is perfectly normal, or you'll see nothing but solid
green flickering on the top 2/3 of the screen, the bottom of the screen
is black, with an arch shaped bordering between the two. When the
latter happens, seems like only the green gun is working to produce a
solid green, no picture. A Sears repairman came out, but didn't find
anything. He suspected there is a loose connection somewhere on the
signal board since the problem is intermittent. Any insight is
appreciated.

Yup either a bad CRT or your convergance amps have a bad solder joint.
pull off the speaker grille and then the cardboard or wood shield, you
will see 2 large heat sinks on a board. turn on the set and lightly
wiggle the heat sinks one at a time and see if it temporary stops your
problem . If it does the pull that board out it just unclips and
resolder all the joints it is quite common on that model