Question about Samsung SyncMaster 753S 17" CRT Monitor

1 Answer

Brightness Problem My monitor is of jun' 2002. Recently my monitor' EHT was replaced. After that it was working fine,but a few days back its brightness has increased.Even when I set the brightness in the OSD to zero the brightness is high.Also the focussing is not sharp on edges when i focus in EHT.

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  • Shuvendra Sep 20, 2008

    I don't know where the capacitors you stated are located.
    Please describe the exact place of the capacitors.


  • Shuvendra Sep 25, 2008

    As you said I examined the EHT and found written on it 'screen' but couldn't find any knob for controlling except the H-focus and V-focus knob. Where is that knob located?


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  • Master
  • 6,966 Answers

Hi,

Since focus adjustment using the flyback rear controls (EHT) has no effect, then it could possible mean two things:

  • the EHT is defective (most likely) at least the controls; or
  • the picture tube is already weak.
A workaround is to replace the filter capacitor of the ~70V leading to the collector voltage of the 3 color drive transistor. Normally used to replace with is 100uF/160V.

Of course best would be to have the EHT checked/replaced.

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.

Posted on Aug 14, 2008

  • 1 more comment 
  • Louie  Role
    Louie Role Sep 20, 2008

    Hi again,

    That would be C108 (47uF/100V) and as earlier stated, replace with a 100uF/160V. It is located on the CRT board, the squarish PCB right at the very end of the picture tube. This should help improve the focus but of course, you need to fine tune it using the focus control on the FBT.

    Additionally, you may want to check R104 (390 ohms/ 1/2 watt) G2 resistor in the same board. The overly bright could be corrected with further adjustment on the screen control on the FBT.


  • Louie  Role
    Louie Role Sep 20, 2008

    With your indulgence, perhaps you could re-evaluate the rating you gave me. Maybe unknown to you, the "Thanks for Trying" actually is detrimental to my rating and ranking.

  • Louie  Role
    Louie Role Sep 25, 2008

    To my knowledge, a Samsung SyncMaster 753S uses an FBT with P/N FQM17BB015 (T501_1). The screen control would be in the same area as the focus control. Some replacement/versions has two focus controls but would still have a screen controller. If for some reason the screen controller is not in the FBT, then pls follow the G2 red wire from the CRT driver PCB to where it leads to. In some mods, the G2/Screen control may be relocated in the CRT driver PCB.

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Check following:
1- VGA chord; is it loose or faulty?
2- Power Supply section not regulating perfectly.
3- Supply line from SMPS/Regulator power supply to EHT.
4- Brightness lines and controls (Resitance may be dry soldered or burnt)
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