This has been bugging me for a while but will a monitor unit work if I make common ground for returns for RGB and the ground?

A bit scared to test it on my monitor.

  • \$\begingroup\$ You can connect together all the GND pins. If you have a ohmmeter you will see that they are already connected both on the PC and the display. Now, if you are making a cable, image quality may suffer if the colours and synchros are not wired in separate controlled impedance twisted or coaxial wires. \$\endgroup\$
    – TEMLIB
    Jun 14, 2016 at 18:32
  • \$\begingroup\$ So if I short them, they keep displaying right? \$\endgroup\$ Jun 14, 2016 at 18:36
  • \$\begingroup\$ I have done this couple years ago. Worked fine, no issues. What you achieve may vary due to interferences... anyway, you should not be afraid to test it. \$\endgroup\$ Jun 14, 2016 at 18:46
  • \$\begingroup\$ Sure, it may have some ghosting. But why would you want to do this? \$\endgroup\$
    – Passerby
    Jun 14, 2016 at 18:54
  • 2
    \$\begingroup\$ Bad idea. You intend to leave the signal lines connected and switch the grounds. Even if the grounds aren't connected alternatively via mains ground, USB or something else there will be enough capacitance to ground to drive the signals crazy. \$\endgroup\$
    – Transistor
    Jun 14, 2016 at 20:11


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