1986 RCA XL100 Set - Videokarma.org TV - Video

Console User · #1 03-21-2021, 04:04 PM

My 86 RCA XL100 just recently has developed a very noticeable dark or off colored patch in the upper right hand corner of the TV Set. If something is showing red on the screen that upper right corner will show purple for example.

Anyone know what this could be like a faulty capacitor or an issue with the Picture Tube itself?

Thanks.

zeno · #2 03-21-2021, 05:10 PM

Your purity is off. RCA jugs used a glued on yoke & usually a strip
of magnetic tape on the neck so things are not done as usual.

1) be sure nothing magnetic is near the set such as a speaker.
2) the degauss may have stopped working. Usually its just a thermister that
fell apart. Most of time you can solder back together.
3) They use correction magnets that are glued to the CRT bell.
One may have fallen off. They are brown & chevron shapped.

Post the chassis number also ( CTC###- ) and maybe a chassis pix
to help us point things out.

BTW DO NOT mess with that magnetic tape on the neck of the CRT !
It will not help you.

73 Zeno

LFOD !

JohnCT · #3 03-21-2021, 06:05 PM

^^That^^ If you solder the degauss thermister back together, use medium heat. Too hot and it'll crack, too cool and the iron will need too much contact time. Either way it will split.

Quote:

Originally Posted by zeno

BTW DO NOT mess with that magnetic tape on the neck of the CRT !
It will not help you.

Off topic follows!:

Oh boy, you reminded me of a story of a Sony 36" that had been bumped a bit too hard. It came in for off colors in blotches and manual degaussing didn't help, so we were dealing with a warped shadow mask. RCA actually had part numbers for that magnetic tape so I had ordered a couple of bags of them to keep in the shop for tweaking mostly Sonys, which tended to be a bit off anyway, particularly the big tubes.

So I found that with about 8 of these stick on magnets affixed to the Sony tube in various locations, I got pretty good purity - although the geometry was ginked a bit as a result of too many magnets. It actually looked very good in the mirror but when I spun the TV around on the service cart, it was as bad as before. Uh oh Andy. It was now very sensitive to compass direction.

I had the customer use a compass to determine which way the face of the tube was pointing at home, and I redid the magnets again with the TV facing the same compass direction. Wasn't perfect but the guy was happy. Back then, a big Sony CRT was huge bucks.

John