The screen is showing a green or yellow circle in the middle lower section of the screen the rest of the picture is perfect a repair man told me that it was the LCD drive engine but after reading differant forams I just dont know anymore can any of you please help
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Re: LG projecter TV
That color cause by a not correct voltage drops, this may cause by parts that is not functioning properly, Please try to regulate the power supply of your tv. But maybe the repairman is correct in his speculation.
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Always start at the vary center of the screen with Green. Position Red over Green, then Blue over what now will look yellow. If all is perfect except the outside, you will need to adjust "Mid-Size" until the middle is just as far off as the outside lines. Then adjust the main "Size" adustments to match. Go very slow or you can make a mess of it.
I am slightly confused about the model of the television, because a 46F500 is a rear projection set that doesn't have a lamp. It has 3 picture tubes and I have a few of them in my shop right now that have the problem you reported. What we do to this set when it develops a convergence issue is to check each resistor around the convergence chips for discoloration, and replace any of them that have changed in value, along with the STK392-150 ic's. If you don't have an ohm meter and solder/desolder equiptment, you can usually get a shop to do this repair for 150.00 to 350.00. Parts will be 50.00 and labor , the rest, depending on the quality of repair shop that you use. Good luck, Russmann.
try to set the convergance if you cant you can adjust the color tubes from inside the tv but have to be very careful to do this. There is actually only 3 colors in the tv red, blue green so I would say your blue and green need lined up
Can you post the board location number of thr resistor that is circled in yellow such as R8006 and I will post the rating of that resistor as thats what the problem is usually one or two of the resistors will burn when the ICs go out.
When tv has a blue or red or yellow circle in middle of screen and it is very faint looking in most cases it is the light engine.
The cost is 650,00 plus labor. In some cases it could be the color wheel. but rear .
The lamp is not the problem
thanks doctor video leading edge electronics snce 1987