I have a 10 year old 27" CRT Sanyo TV and the picture has collapsed into a single, very bright, horizontal line. I was wondering if this was a failure in the horizontal oscillator circuit? I know circuit repair so I was trying to isolate the problem down to the area on the board. Also, there was a bad solder joint in the vertical area of the board and I used to wiggle the cable jack on the back to make the picture go full-size. Eventually, the wiggling stopped working so I opened up the set and that's when I saw the bad solder joint. I fixed it but the picture never came back. I have a feeling the arcing in the bad solder joint blew something out in the horizontal. Any suggestions (besides get a new tv)? Thanks for the time!

If you have a horizontal line your horizontal circuitry is working. What you should focus on is the vertical deflection circuitry. There's probably some transistors fried in there--especially since you mentioned the arcing connection.

The electron beam is being deflected horizontally just fine, but not vertically.

Good luck--and respect the very high voltages inside a TV!
WallyH

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Originally Posted by WallyHelps

If you have a horizontal line your horizontal circuitry is working. What you should focus on is the vertical deflection circuitry. There's probably some transistors fried in there--especially since you mentioned the arcing connection.

The electron beam is being deflected horizontally just fine, but not vertically.

Good luck--and respect the very high voltages inside a TV!
WallyH

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Thank you for the info. Got it now.