Question about Sony KP-41T65 41" Rear Projection Television
What you are seeing are called retrace lines. They occur when the blanking pulse does not completely turn off the electron gun of the CRTs. This could be due to insuffient pulse which could be the result of the verical signal lowering in amplitude or more likely the voltage on the anode of the CRTs has increased. You will need to take some voltage measurments to make sure which situation exists.
if you have a background in electronics you will need to following pieces of equipment.
1) High Voltage probe
3) DC voltmeter
In addition to these you will need a schematic. using the schematic as a guide measure the high voltage on the anodes of the CRTs it should be about 30KV. if the voltage is higher you then would check the voltage on the screen, control and focus grids of the CRTs if these are higher this indicates that the focus block or the voltage doubler might be at fault. These checks will put you in the ball park of finding the problem because if these major parts are not the cause you might be looking at a bad resistor or capacitor and you can troubleshoot these by looking at the dc levels and the signal across them .
If you need any other assistance please comment to the site and I'll be here to help.
Now if you do not have an electronics background I would suggest that you have a TV repair person take a look at your set .
I hope this helps,
Posted on Oct 18, 2007
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