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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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Panasonic CTP-31XF30 -- where is the vertical deflection criruit?
Panasonic CTP-31XF30 television, chassis No: ALEDP214. Set has intermittent
single horizontal line in the middle of the screen. From my reading, I have determined that I should check the power supply to the vertical deflection chip, replace electrolytic capacitors in the vertical deflection circuit, and possibly check for a bad service switch. My issue is locating these parts on the printed circuit boards. Can anyone point me to a schematic of this set or identify the location of the vertical deflection components??? |
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On most Panasonic's its labeled IC451 (a LA7xxxx series chip) Your mileage
may vary though. -- ========================== Jeff Stielau Shoreline Electronics Repair 344 East Main Street Clinton,CT 06413 860-399-1861 860-664-3535 (fax) ======================== "ArdentGuy" wrote in message lkaboutelectronicequipment.com... Panasonic CTP-31XF30 television, chassis No: ALEDP214. Set has intermittent single horizontal line in the middle of the screen. From my reading, I have determined that I should check the power supply to the vertical deflection chip, replace electrolytic capacitors in the vertical deflection circuit, and possibly check for a bad service switch. My issue is locating these parts on the printed circuit boards. Can anyone point me to a schematic of this set or identify the location of the vertical deflection components??? |
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Thanks for the hint about the vertical deflection chip usually being IC451.
I found a component labeled IC4351 but I can't make out any numbers on the item and it doesn't look like an IC in that it is mounted on it's edge. It is on the same board with all the PIP adjustment pots and horizontal adjustments. IC4352 and IC4353 are also on the board...these two are packaged like a standard "two-rows-of-pins" IC. How many pins are usually on the vertical deflection chip? Can you give me an actual chip number so that I can look it up (even if it is not the correct one for my model)? I just want to see what one of these chips looks like, how much they cost, and where to find one. One more symptom to report...when the television is powered on, there are 5-6 white lines in the top of the picture. These white lines gradually move up and out of the picture within the first 30-40 seconds. Does this mean anything to anybody? This may be unrelated, but just behind the flyback transformer is a zenor diode that has discolored the PCB with some heat. The diode in questioned is bordered by two capacitors: C553 and C554. C553 is discolored but as it was leaning over zenor, it may have just been cooked by the diode. I think I'm going to need some schematic help on this one. Does anyone know what the diodes near C553 and C554 are used for? THANKS FOR ANY HELP YOU CAN PROVIDE! ==================================== |
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