One week ago, the color green appeared on the screen with skewed horizontal lines, and then turned off. Each time I turn it on the sound is fine, I can barely see an image behind the green color. This last for about 15 seconds and then the tv automacially turns off. It is a 1994 Mitsubishi Big Screen Model TS-5053. I disconnedted the cable, but the probelm persist. Your suggestions and advice would be appreciated.
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I am wondering if we have the correct model number listed here? If so with the model listed either something is inside like a spider web or that model uses a optical light engine which "might" be able to do this if bad.
if colors look skewed and come and go----next time enter the convergence menu on the set and call up advanced---a grid of lines should appear---if skewed when set bad (lines should be yellow) you have a common issue---convergence----the model indicated uses two stk-394-250 chips and both would have to be replaced.
Model indicated here DOES NOT HAVE A COLOR WHEEL- so you might want to enter customer menu and call up CONVERGENCE-THEN advanced convergence---a grid of yellow lines should appear----are they showing blue or red skewed etc?
Other is to look with color off to see if black and white screen or not?
Does not sound like the chips are bad. What you need to adjust is "SKEW". You need to enter "service Mode" then go into "Coarse Convergence". Skew can be adjusted for all 3 colors. Unless you have the service manual, these corrections should not be attempted.
To clean the INSIDE of the screen, you really have to disassemble the TV. Remove all the screws that hold the "back" ( the piece with the mirror) to the front (screen) assembly. The screen can be cleaned with a solution of diluted isopropyl alcohol, no more than a 50% solution. Drugstores will carry it, but it might be 70%-90%. Just dilute with distilled water (not tap water as it contains minerals). Personally I have used 70% with no ill side effects but 50% is recommended.
We had a blue cone on the screen. We have adjusted the sharpness, contrast, and cross hairs. The cone has almost completely disappeared, but we still have blue shadows. Could this mean a blown color tube?