Member Avatar for hispania9th

Hi using full hd TV as monitor but flickers even when refreshed. It also has the annoying habit of not recognising any changes made when rebooted forcing me to reconnect the old monitor and follow the whole procedure again. Embarrassingly I am using and old dell optiplex gx620 whilst awaiting my new comp. Please help

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A compact, practical troubleshooting checklist to isolate whether the problem is the PC, the cable/handshake, or the TV itself. This builds on ’s refresh/resolution suggestion and the compatibility notes from and , and gives ordered steps that usually find the cause without opening the set.

  • Swap cable and port first: try a different HDMI (or DVI->HDMI) cable and a different TV HDMI input. Use a short, good-quality cable and avoid passive extenders. If the flicker moves or disappears, the link/port is at fault.
  • Put the TV into a PC/Computer input mode and disable processing: turn off motion smoothing, noise reduction, dynamic contrast and any “overscan” scaling. Look for menu names like Just Scan, Exact Pixel, 1:1 or Screen Fit. These settings remove extra TV processing that often breaks fine PC output.
  • Force a clean PC timing: update the video driver, then in Intel/NVIDIA/AMD control panel set an exact native-resolution timing (progressive 1920x1080 @ 60Hz if the set is 1080p). Avoid interlaced modes (1080i). Save the mode as a profile so it persists.
  • Isolate OS/driver vs TV hardware: test the TV with another computer or boot a Linux live USB. If the issue follows the TV regardless of source, internal electronics are likely. If it only appears from one PC, it’s a driver/GPU/EDID problem.
  • EDID/handshake persistence: if settings are lost on reboot, the PC may not read the TV EDID at boot. Forcing a saved custom mode or using an EDID-keeper/emulator fixes that without servicing the TV.
  • Last resort: firmware update or service. Consistent, periodic flicker on all inputs often means failing internal power/T-con circuitry and needs repair or replacement; do not open the chassis unless qualified.

Start with cables and TV-menu adjustments, then drivers and EDID checks. These steps resolve the majority of PC-to-TV flicker cases.

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All 9 Replies

Member Avatar for Rik_

You haven't said what windows version you are using.

Member Avatar for hispania9th

Hi using full hd TV as monitor but flickers even when refreshed. It also has the annoying habit of not recognising any changes made when rebooted forcing me to reconnect the old monitor and follow the whole procedure again. Embarrassingly I am using and old dell optiplex gx620 whilst awaiting my new comp. Please help

Sorry I am using vista ultimate

Member Avatar for Rik_

Has Vista installed a driver for it or does it call it a generic TV?

Member Avatar for hispania9th

Thank you for your replies. I have now updated to windows 7 on a Packard bell and the t.v. is still flickering like mad. Does this mean it is a t.v. fault? It is only when I am using my computer on it as it is a perfect picture when on x-box or DVD.
Thank you

Member Avatar for Rik_

Try different resolutions and refresh rates on it.

Member Avatar for hispania9th

Already have mate

Member Avatar for Rik_

Perhaps your TV has a dried out capacitor then?!?

Member Avatar for justo0

Is your system is not compatible ?

Member Avatar for smartvmuk

May be your system is not compatible, it would be better if could go through the manual.

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