Pincushion problem I replaced the flyback transformer on this TV. After starting it up, I now have a pincushion (E/W) that won't resolve itself. Picture has a consistent hourglass image and wider than normal )|( . Any thoughts on component replacement or could this be a cold solder joint issue? Thanks in advance.

Pete Williams Jan 01, 2007

henlopen,
The h-out transistor was replaced as well. Could an overvoltage issue damage the IC in the pincushion circuit?

1 Answer

Bill Heronemus

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308 Answers

My thoughts would be, was it a Sony OEM transformer or a generic type? If the latter, that is probably a likely suspect. Another thing would be misplaced wires or switches that could have been accidently moved while replacing the transformer. I have had some of these sets that had no high voltage, and all it turned out to be was a broken solder connection on one of the pins going to the flyback transformer. Usually, if the flyback is bad, the Horizontal output transistor would be also defective. It's also possible that in the process of removing the old flyback (fun job wasn't it?) you may have cracked one or more of the circuit traces in that area of the PC board.

Posted on Jan 01, 2007

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