Intermittent blank screen with r,g and b semi-circles at top of screen
The problem I have is ocassionally the screen will go blank with the red, green and blue semi-circles at the top of the screen. The audio is still good and the standby LED is blinking. Sometimes, the problem will correct itself. I start to see the semi-circles start to stretch across the too of the screen the picture pops back into place...only for this to happen again a few minutes later. Sometimes it never corrects itself and I turn the tv off for a few minutes. When I turn it back on, I get a good picture for a while but the problem returns. Any ideas on the cause of this problem?
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Check and replace damaged component/s at its horizontal scan output section circuit. Check the LOT (Line Output Transformer) too for damage. Replace the horizontal scan output transistor. Check the input voltage to LOT. If the voltage is absent check the feeder resistor; if any. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. http://electronicshelponline.blogspot.com/
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Do you have a green light that flashes and then goes off? You need instalation kit# 4835 310 57673, The chassis# is probably an L04.1U AA, correct? What you will do is correct the horizontal timing so everything will come on at the same time. After you install you will see red, blue, and green horizontal lines at the top of your screen.......this is normal when you power up your TV. This is a factory authorized repair.