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Sylvania tv my tv is messed up i will be watching it when all of a sudden the picture will disapear into just one fine line so then i tap it and the picture will come back i have to do it a few times and dont know what the problem is can anyone help please.

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I know your problem for sure. If the fine line you are seeing is horizontal, you have a bad capacitor (or cold solder joint) in the "vertical deflection" circuits. Look for four of the largest wires coming from the picture tube and follow them down to the circuit board. These wires do NOT come out of the BACK of the tube, where most of the wires come from, but rather come sort of from the side of the tube. Two of them will go down to the board near the largest component on your board known as the "flyback transformer". Disregard these two and follow the other two. They will go near either two transistors or a vertical deflection chip. The board will normally be labeled "vertical" or vertical deflection near these transistors. There will be two or more capacitors very near these transistors. Look at them on the underside of the board and look for a bad solder joint. Push on the capacitors left and right while observing the underside of the board and you might be able to see the bad joint. If it is a chip instead of transistors, you could still have a bad capacitor or cold solder joint, but in most cases if it's a chip, then the chip is bad. Since, however, you can tap on the tv and make it work temporarily, this tells me that you probably have two vertical deflection transistors with associated capacitors. If the caps are good and no cold joints, then replace the transistors. This part of your tv is what pulls the electron beam up and down vertically and is thus called the vertical deflection circuits. With no vertical deflection, then the beam just moves left and right and never moves up and down. The picture is still there, but it is contained inside the fine line where of course you cannot see it. The parts in this circuit are not expensive at all. Keever

Posted on Mar 03, 2008

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