On controlls the foucus...the other the brightness. I would not mess with them. 99% of the time the problems is one of the two listed below...
You have one of two problems. Sometimes both.
Problem #1) CRT Fluid is Cloudy
tubes have a liquid coolant that is used to keep them from overheating. After many years the coolant in the blue and green tubes will become cloudy and cause the screen to look dull, red/orange, etc. You may even see halos around images
of a set that needs the fluid changed. TV
set after fluid change Solution
What you will need to do is replace the coolant and clean the crt. You can get a repair kit from www.TvRepairKits.com
that includes replacement coolant, photos. instructions, etc.
may have a convergence failure. ( common problem )
Here are some of the most common symptoms and example photos
of a convergence problem
- Screen looks 3D
- Colors don't line up
- One or more colors can't be adjusted when using the convergence menu.
- Screen is bowed or warped.
Here are some photos
of convergence problems.
Here is a quick test....
Using your original remote go-to the tv
settings then goto the convergence section.
Try to adjust the red and then the blue convergence.
You should be able to move them up, down, left, and right.
If you can't move them in all directions your convergence chips are bad and should be replaced. This is a common problem. Solution
You will need to replace the convergence chips and possibly some convergence resistors and pico fuses. Its a fairly easy DIY job or you can call
in a pro. If you want to do the repair yourself check the site www.TvRepairKits.com
. Their kits include a photo
instruction guide, original OEM Sanyo
STK chips, convergence resistors, pico fuses, thermal paste, email
/phone support, etc.