How do portable DC tv's deguass?

Question

I picked up a Sony KV-8AD10 with really bad color and it almost looks like it needs to be de-gaussed. So i opened it up to check the circuit and there was no de-gauss coil or related circuitry. The set is supposed to take AC as well as 12V DC, but it has since been "modified" to accept DC only. So how do I de-gauss this thing other than manually--did old portable tv's not have this feature?

Also could the color problem be related to the LA7650K IC? From previous posts on this group I've heard this suggested.

Any thoughtful insights appreciated!

Stu

Dave Plowman (News) · Accepted Answer

Think this is a problem with most 12v stuff. Some pro monitors for location work have a 12 volt de-gauss circuit, but only the expensive ones. Others need to be run off mains occasionally to do this - or use a tool. --  *I like cats, too.  Let's exchange recipes.     Dave Plowman                   London SW                   To e-mail, change noise into sound.

Charles Schuler · Answer

One of those big, old 350W soldering guns (not irons) degauss nicely.

Dave Plowman (News) · Answer

Interesting tip - I'll try it. Thanks. ;-)-- *According to my calculations, the problem doesn't exist.    Dave Plowman                   London SW                  To e-mail, change noise into sound.

Art · Answer

A Tape Demag item will work also.

Mark · Answer

you need to be able to get a good black and white picture before you try for color.

if you can't get good b&w then you may have a demag purity convergence etc problem.

after you get that all set and get good b&w, then you can start to troubleshoot the color.

Mark

How do portable DC tv's deguass?

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