Sony FD Trinitron WEGA KV-27FS200 27" TV Logo
Pete Williams Posted on Jan 01, 2007
Answered by a Fixya Expert

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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?

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1 Answer

Bill Heronemus

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  • Posted on Jan 01, 2007
Bill Heronemus
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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.

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Their are pincushion circuits the compensate for inward curvature. It is common for solder connections to break on the pincushion transformers or the connections where the transformer wire is wrapped around the connector pin. Careful inspection under a magnifying glass while manipulating the pin sometime will show hairline cracks in the solder. Their are also adjustments on the convergence board that will compensate. The adjustment potentiometers on the convergence board also have shown to be prone to solder cracking on the PC board
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check for cold solder joints around the flyback transformer and a open pico type fuse very close to it. they are rectangle in shape and ususually the one in the middle of the three is the culprit. The problem is in the pincushion circuit
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Its not worth the repair if you still want to go ahead i need to know two things:
Are you going to have a qualified electronics technician fit it?
If you are planning to fit it yourself are you a qualified electronics technician?
If you answered no to both of these questions i cannot tell you where to get one or how to fit it due to the massive amounts of danger involved.
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Both transistors have built in damper diodes that are designed to work in "flyback" circuits, and the 2SD2645 is rated to handle 15 more watts and 2 amps more current than the 2SD2634, so I suspect the technican felt that the replacement part would be less likely to go bad. Of course if they subbed the transistor, could the flyback also be a substitute? Sometimes faulty capacitors in the collector circuit of the Horizontal output transistor can cause timing problems that also cause the transistor to fail. If that is the case, then further troubleshooting is required to find and replace said capacitor(s), and that could also be the root of your problem. There is also one other possibility I can think of (aha!) and that is that the 2SD2645 was a "off brand generic" that does not live up to its published specifications. With Sony products, I have learned (the hard way sometimes) that it is usually best to use only OEM parts.
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Lets try something before you call for a second opinion,with the tv ON and the problem showing hit the top and side of the tv,if the picture somehow reacts or corrects itself when you hit it call someone else and tell them what the problem is and that you feel it has a loose conection,dont have to tell them about the first estimate. Dont hit the tv with a hammer,just with the palm of your hand.Is worth the try. Good luck.
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