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| | |-+  Tatung VS14228T retrace lines
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Author Topic: Tatung VS14228T retrace lines  (Read 2508 times)
badbaud
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« on: July 19, 2013, 02:07:25 AM »

This is the one that has the power supply located inside a metal cage which is mounted above the board and the neck board has transistors but no IC.

Did a complete cap job, all electrolytics replaced.

Replaced H and V transistors on input.

Replaced vertical amp and H/V IC.

Still get retrace lined from the middle of the screen to the top of the screen.

All I have is a blurry schematic to work with and can't figure out how blanking is developed in the circuit.

Any help would be appreciated.
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montech
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How long is a short?


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« Reply #1 on: September 12, 2013, 07:16:21 PM »

Check R720 off pin 10 and 12 0f the LA7837. Its a weird value like 140 ohms at 2 watts, I have seen them go way up and cause this problem.
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There ya go again...trying to find a simple answer to a complex problem...all you techs are the same!
badbaud
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« Reply #2 on: September 12, 2013, 08:59:20 PM »

Thanks! I'll give that a try and let you know.
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