Having problems with your Standard (CRT) Televisions ?

Our 2004 rca tube tv screen went recently went out on us. When you turn on the power, you can hear the tv and you'll only see a blue line in the middle of the screen that shrinks and fads out and the tv eventually turns off completely. We cannot see anything on the screen besides the blue line and only for about 3 seconds. We would like to know how to fix this in the cheapest manner possible. I looked online before and it said something about the tact switches possibly needing replacement?



Answers :

Hello
\015\012It is reparable problem. You see a blue line across the middle of the screen I thinks and posts this solution. The fault is due to the absence of vertical scan. In your set, there is an IC used for this purpose, and it has been dead short now. That is why you see the line at the begining, and it disappears a few minutes after. The vertcial output IC can be located at the main printed circuit board, usually screwed on to a metal heatsink to sink away the heat genereted in it while working. You can easly located it by the following method.
\015\012Look at the deflection coil, the coil fitted at the neck of the picture tube. From which, four wire will go towards the printed circuit board, and will be pluged on to it with socket. Just draw out the printed circuit board from the TV and turn it upside down. Look for the connections that I have menttioned earlier, four of them, out of which two of them will be for horizontal scan, and two of them will meant for vertical scan. Follow the vertical scan track, can be identified by two wires emerges form the board, will be connected via copper track and will go to the vertical section, from which you can identify the vertical IC fitted neareby it, usually will have 7 or 9 pin vertical type one.
\015\012There is no need to check it now, because, it has already been shorted and damaged in your TVs present case. Desolder it out from the board, and go for a new one of same type and number, replace it as the previous IC was, will solver your proble.
\015\012You must have a desoldering pump, a soldering Iron, solder wire, some knoledge in electronics,and more comecentration and patience. OK.
\015\012

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