There is about a four inch wide bar at the top of the tv and the part of the pitcher in it is upside down
That fault is called vertical foldover, and it is mainly due to some fault in the vertical output section inside the circuit borad of your tv. It may be due to some capacitor problems or an Ic fault. To rectify the problem, you shoud open your tv. Take every precautions before opening the tv, while we take working with an electrical equipment. As high as 30,000VDC points are there inside your tv, while it is working, or even after that, the picture tube's final anode will have a charge equal to the voltage said above, for a long time, you should be very cacutious.
Open your Tv, and locate the vertical output section. It is easy to locate. As you open your tv, you can see the vertical deflection yoke, the coil fitted around the neck of the picture tube. From it, there will be four wires going to the main printed circuit board, out of which, two will be thick, normally red and blue coloured, and the other two will be thin. Follow the the two thin wires, you will see it to be connected to a plug in point on the printed circuit board. just upside down the printed circuit board without distrubing any of its plug in connections, and follow the underside circuit track, and it will guide you to the vertical output section.
There you can see an Integrated Circuit, otherwise known as [IC], screwed onto a metal heatsink, to radiate the heat out ot it while it is working. Just resolder all the leg solderings of that Ic first, and switch on the tv to find there is any change to the vertical foldover. Usually these points will get loose contacted, as they are heated and cooled repetadly. Sometimes this process may resolve your problem.
If not, change the supply filter capacitor, that filters the input supply voltage to that IC. It is best to change the filter capacitor said above, and all the capacitors in that section, which will not cost too much. When replacing capacitors, keep a keen look on its polarity, where electrolytic capacitors ahve positive and negative legs marked on it, it should coincide to that of the markings on the printed circuit board, otherwise there is a chance for them to explode out.
You just concentrate only on this section inside your TV, since the fault is surely there. Just proceed with confidence. You will and you can. Wish you sucess.
Nov 17, 2010 |
JVC AV-32D305 32" TV