Hi,
Please go to user manual page 43 of your tv which stated...
This TV does not support Sync on Green or Composite Sync.
If a signal other than in the above chart is input, it may not be displayed properly or may not be displayed as you set.
Using the Vertical frequency (Hz) of the personal computer at 60 is recommended.
Try to select proper Display Properties > Settings > Advance > Monitor > Screen refresh rate.
Regards,
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