Many of these sets had bad picture tubes--they use a red, green and blue crt. Most commonly the blue gives
troubles--The tubes are now only available on a rebuild basis--usually
not worth doing as the cost is very high.
You may have a bad
blue picture tube but there is a way to deal with this first----the set
has a black plastic block with six controls---three are
Focus(red,green,blue) the other 3 controls are Screen controls(red,
green, blue)
Someone has to remove the entire piece on the
front of the set below the screen(usually a plastic part) most of the
time it is secured with 3 screws on either side of the set in the back;
once you remove the screws the entire piece should pull out(pull from
right to left(it will not fall off or come out easy--it is held in with
several large plastic pegs) With it removed there is an inspection plate
with 4 screws-----the screen/focus block is behind it.
You need
to look very closely at the block to identify the focus versus
screen controls----one row left to right will be marked Focus and the
other row leftto right will be marked screen------YOU need to locate
the Green Screen control (they are black like the block) With the set
on(be careful) go to a video input 
with nothing connected---if you see a green screen as well as the input
number turn the Green SCREEN CONTROL SLOWLY TO THE LEFT UNTIL THE green is
gone.
If this cures the problem you may only be buying yourself
some time----if the picture tube is bad sooner or later this
trouble may return----I have seen sets where this was adjusted and the
set worked for a year or more with no repeat of the trouble----replacing
thetube would likely cost you 400 -500 parts and labor.
I do this here for free so if this has helped you rate this solution.
SD TECH
239 views
Usually answered in minutes!
×