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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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Pincushion porblem
Hi,
I have a Goodmans 28" (286NS/05) television. The image has suddenly become distorted (pincushion). I am trying to get a way to identify the faulty component but am unsuccessful. Could anybody help me here? I have located a potentiometer (small orange one) on the CRT's circuit board when I put it to maximum the image increased its pin cushion size but I need to get this distortion out. I would appreciate anyones help. Thanks in advance. |
#2
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Pincushion porblem
A common fault are capacitors going off value in the pin cushioning amp
section. You will need an ESR meter to properly test all the caps, or substitute them until you weed out all the bad ones. This does not rule out the possibility of having other types of components that have failed due to age and use. The harder way to fix this is to use a scope and DVM, and go through the pin amp area to determine the fault by evaluation of the waveforms, and signal and DC voltage levels. To get involved in this you will need to purchase the service manual, and the basic test instruments to start with. My suggestion would be to take the set to a service centre that services the make of TV you have, and let them service it for you. Normally these types of repairs are not very expensive in relation to replacing the set. -- Jerry G. ========================== "Noman" wrote in message om... Hi, I have a Goodmans 28" (286NS/05) television. The image has suddenly become distorted (pincushion). I am trying to get a way to identify the faulty component but am unsuccessful. Could anybody help me here? I have located a potentiometer (small orange one) on the CRT's circuit board when I put it to maximum the image increased its pin cushion size but I need to get this distortion out. I would appreciate anyones help. Thanks in advance. |
#3
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Pincushion porblem
"Noman" wrote in message om... Hi, I have a Goodmans 28" (286NS/05) television. The image has suddenly become distorted (pincushion). I am trying to get a way to identify the faulty component but am unsuccessful. Could anybody help me here? I have located a potentiometer (small orange one) on the CRT's circuit board when I put it to maximum the image increased its pin cushion size but I need to get this distortion out. I would appreciate anyones help. Thanks in advance. *DON'T* mess with any adjustments, this is *not* a matter of adjusting the problem out, a part has failed and will need replacement. |
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