Solid green screen problem on Sony TV - KV-36FS

[aeromys]

Hi,
I have a 5 year old Sony KV-36FS70K which today developed an odd fault.

On switching on, the entire screen is a uniform bright green, with a
constant flicker every four seconds. It's not a green tint, with
picture visible underneath, but a solid block green. Audio for the
chosen channel is unaffected and clear, and the flicker makes no sound
either.

This happens on all inputs, from all sources both front and back of the
TV.

However... if I go to the PAP (Picture and Picture) mode, which divides
the screen into two halves for two channel watching, the left side
screen remains this constant green, while the right side screen
displays a perfect colour picture !!??? Also, if I go into the multi
PIP mode with the 12 little pictures around a central main one, the 12
little still pictures are perfect / normal colour, while the main one
in the middle is the bright green. In both cases, the entire main
screen still has the constant flicker.

As the screen is still able to display secondary images in colour, I'm
guessing (hoping ! ) that the tube is still ok, and that this is some
sort of settings glitch. Somehow, the primary image channel is
corrupted into a plain bright green, but secondary picture in picture
channels aren't. Teletext is fine and in colour also, providing I use
it in full screen dedicated mode, if I choose to have it as text over
the picture, it's bright green screen time again.

Family have been interrogated and tortured and say they haven't altered
anything, and quite frankly I don't think there's any settings within
the remote that can cause this. I've tried a power off re-set, and
checked all the standard user settings on the user level menus. I'm not
averse to going into the engineer menu, I had to do that when I first
got it to set up the NTSC scart mode, but have not been in there since
for 5 years and it's run faultlessly until today.

Any bodies got any ideas?

 

[aeromys]

Or cab anyone reccommend a specific TV engineer type forum or group
that may be able to help? I'm desperate here folks

 

[Sam Goldwasser]

Or cab anyone reccommend a specific TV engineer type forum or group
that may be able to help? I'm desperate here folks

There's no better than this one.

Possible causes inlude CRT H-K short and green output driver failure.

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[Mr. Land]

Trying to give you a definitive answer based solely on the info you
gave is a little like divination, but it sounds like your tube is OK,
and that you otherwise have some problem in a video output section
somewhere.

I'd guess you're going to need a schematic and a scope for this one.

 

[aeromys]

Thanks all, I was sort of hoping there would be a magic answer, but in
reality I guess there never is :-( Poor old thing will have to go off
to the Sony shop. I'll have to hire a crane !