Question about Samsung SyncMaster 753S 17" CRT Monitor

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Width problem Samsung 17" Monitor. The problem is insufficient width and convergence problem. The user control while trying to increase the width is not working. Neither is the Horizontal position control. The transistor Q420 was found to be short. It was replaced. But the problem still persists. For convergence problem what should be done

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To have unlock your control (auto-adjust ...) you have to hold down the "menu Key" for about an 10 seconds. This will unlock your monitor! peroludiarom@abv.bg

Posted on Feb 12, 2007

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Hi,

Appreciate the "Ask Me".

I am assuming that you have more than just familiarity with electronic components and circuitry, the use of a DVM and a soldering iron. Further, that you have access to a service manual.

Width problem is basically insufficient horizontal deflection, then analysis would have to be in the horizontal section. Areas to initially focus on:
  1. 12V line and pin 29 of IC401;
  2. 110 V peak to peak at collector of Q403, if yes check Q 402 & 404 as well as T401;
  3. other components that affect the horizontal size are:
  • IC201
  • Q 405, 406, 407 & 408;
  • D409
  • L401
Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards. Thank you for using FixYa.

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