Tip & How-To about Televison & Video
Many of these sets had problems with 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 todeal with this first----the set has a black plastic block with sixcontrols---three are Focus(red,green,blue) the other 3 controls are Screencontrols(red, green, blue)
Someone has to remove the entire piece on the frontof the set below the screen(usually a plastic part) most of the time it issecured with 3 screws on either side of the set in the back; once you removethe screws the entire piece should pull out(pull from right to left(it will notfall off or come out easy--it is held in with several large plastic pegs) Withit removed there is an inspection plate with 4 screws-----the screen/focusblock is behind it.
You need to look very closely at the block to identify the focus versus screencontrols----one row left to right will be marked Focus and the other row leftto right will be marked screen------YOU need to locate the Blue Screencontrol(they are black like the block) With the set on(be careful) go to a videoinput with nothing connected---if yousee a blue screen as well as the input number turn the BLUE SCREEN CONTROLSLOWLY TO THE LEFT UNTIL THE BLUE is gone.
If this cures the problem you may only be buying yourself some time----if theblue picture tube is bad sooner or later this trouble may return----I have seensets where this was adjusted and the set worked for a year or more with norepeat of the trouble----replacing the blue tube 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
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