Question about Standard (CRT) Televisions
Hi, I have a panasonic tv and evertime I move it the picture sides curve in to look like an hourglass. How can I fix this?
SOURCE: hourglass picture
This is called "pincushion distortion" and there is correction circuitry in the set to take care of it. Obviously it isn't working. Sometimes this is due to parts failure, but it often happens because of bad solder connections to some of the parts. I don't have a service manual for this model so I can't give specific part numbers or locations. But if you have patience and some electronic soldering skills you can try repairing it. Flip up the circuit board so you can see the bottom (the solder side) and start in the area where a connector plugs onto the board that goes to the coil of wire on the neck of the picture tube (the "deflection yoke" it's called). Work around that area and look for solder connections that are visibly cracked or very grainy looking. Good solder joints look smooth and shiny. The bad connections (if that's the cause) will probably be found to transistors, 3-leg parts that may be mounted on metal heat sinks. In fact, make anything in the area mounted on a heat sink the first parts to check. Because the get hot, they are the first ones to develop bad connections. Heat up and resolder any connections that look doubtful. A strong light and a magnifying glass may help.
- UNPLUG THE TV BEFORE YOU START.
- SOME PARTS CAN STORE A CHARGE THAT CAN SHOCK OR KILL YOU EVEN AFTER THE SET HAS BEEN OFF FOR A WHILE.
- With the back off the set, some TV's are unstable. Be careful of the set tipping. You may want to lay it face down on a padded surface before you start working.
Solder connections that go bad are a major cause of problems in TV's, so this might get you going. Just work carefully. If it doesn't take care of the trouble, the problem is part failure and that would require test equipment and the service manual to locate.
Posted on Dec 09, 2008
SOURCE: Panasonic 32" CT-32G13W
That's good you have time and patience.
You should have service manual and electronics knowledge to recognize and test / check parts in tv.
Problem is in Pin Out area of tv and you can have new parts from Panasonic Parts.
You can buy service manual from Service Manual net
Posted on Dec 11, 2008
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