VGA may be an analog display device, but a proper connection will result in either a smooth presentation at 1080p or an AV technician being driven mad by a very shaky picture (ghosted). The procedure outlined below can be used for all types of connections using a VGA-to-VGA Cable, Cable VEX, or an SVGA Cable, including a lecture hall projector, Factory HMI, or Secondary.
Step 1: Select the appropriate cable before starting
Analog cables differ from each other.
- Short Desk Cables (Less Than 5 Meters or 6 Feet): For cables under 5 meters or 6 feet at 1080p/60hz, a standard double-shielded VGA Male-to-Male Cable works well. When using cables at greater distances than 5m or 6ft, or in areas with a high potential for electromagnetic interference (EMI), such as near fluorescent lights (ballasts), variable frequency drives (VFDs), and electrical power lines, you should use a VGA cable with a Ferrite Core or a high-quality (3+9 conductor) VGA cable to reduce cable signal “ghosting.”
- If your current VGA cable is only slightly too short, add a VGA (Male-Female) extension cable instead of replacing the entire cable.
- For wall-mounted TVs or tight clearances, buy a 90 Degree VGA Cable or a Flat VGA Cable; both have installation notes.
- In-wall/Plenum: Use Heavy-Duty In-Wall VGA Cables with CL2/CL3 ratings only.
Step 2: Route as You Care
- Don’t suffocate it: Keep the VGA Cable at least 6 inches away from AC power, fluorescent lights, and motor wires. Analog RGB is pretty sensitive, and any interference shows up as a second (shadow) picture or a wavy edge. If you can’t keep the power lines away, cross them at 90 degrees.
- No kinks: The minimum bend radius should be five times the cable’s outside diameter (OD), or about thirty millimeters if the cable has a 6 mm jacket. If you make a sharp bend, you cause color distortion because you’ve messed up the shape of the coax conductor pairs.
- Wire Management: Use Velcro straps or zip ties (loosely) on racks; don’t over-tighten the zip ties, as crushing the cable jacket flattens the braid and destroys shielding effectiveness.
Step 3: Connecting the HD-15 cables
- Turn off both the source device (PC/KVM/Media Player) and the display BEFORE connecting the HD-15 cables, because ESD can fry the graphics port.
- Orientation matters: the D-sub 15 shell is a trapezoid, with the wider side at the top. To connect the plug to the port, align it straight and push it in until the metal shell touches the equipment bezel. You should feel a solid stop, not a halfway seated connection.
- Once you have plugged in your D-Sub 15 connector, you can finger-tighten the two thumb screws on either end of the connector. The thumb screws will provide a reliable ground connection between your device and the equipment and help prevent the connector from being accidentally pulled out in public.
Note: Do NOT use excessive force when tightening the thumb screws, as it will strip the small 4-40 thread size in the equipment port.
When connecting a VGA Extension Cable, connect the male connector of the extension cable to the VGA cable coming from the source and the female connector of the extension cable to the monitor/projector VGA port. Secure both connections with the screws on both connectors.
Pro Tip: If using an older model of either display or projector, slightly “jiggle” the connector after the screws are tightened. If the displayed image flashes, it means one of the pins is loose and needs to be reseated and tightened.
Step 4: Turn on the power first, then select the right mode.
- Power on the display first to give the EDID table time to configure.
- If your projector doesn’t automatically detect the VGA/RGB connection, manually select that input.
- Windows users: Hold down Win + P and select Duplicate or Extend to do the same thing as Mac users.
- To get macOS to detect your monitor, go to Settings > Displays > Detect Displays.
- All analog resolutions will work (1920×1080, 1680×1050, 1280×1024, 1024×768, 800×600).
A standard 6-foot (1.8-meter) VGA cable is generally plug-and-play. If you use a VGA cable longer than a standard 6-foot cable, you may notice some jitter on the screen. If this happens, simply change your refresh rate from 60Hz to 50Hz.
Note: VGA is only for video; when sound is expected, the 3.5mm sound cable from the source must connect to the sound source (speakers), or otherwise from the source to the display audio line.
Step 5: Quick Diagnosis in the Field
- Blank screen: The wrong input is selected, or the cable is loose. Reseat both ends of the cable and make sure “VGA” is selected in the On-Screen Display (OSD).
- Ghost/Double Image – This may be caused by EMI. Re-route the cable away from AC power sources, use a VGA cable with a ferrite core, or use a 3+9 shield cable.
- Missing (usually Red or Green) Bent Pin in HD-15 Plug – Look carefully and straighten it if it is not broken, and replace the cable if it is.
- Flickering Can Occur In Long Runs: The Signal Will Conduct Longer. You Need To Minimise The Length Of The Run, Add A Signal Booster, Or Use Cable With More Shielding.
Step 6: If your PC only supports HDMI, while your monitor only supports VGA. An active converter is required to convert from HDMI to VGA or from VGA to HDMI.
- HDMI To VGA: Use An HDMI To VGA Cable/Adapter That Has An Active Signal Convertor Built In.
- VGA To HDMI: Use An HDMI To VGA Cable/Adapter With An Active Convertor And Scaler Built Into The Adapter.
2026: Why Is This Still Important?
Most “VGA issues” aren’t caused by the VGA itself; they’re caused by poor-quality cables, poor cable routing, or loose screws. As long as you use the right specifications when installing a Duplex-Shield VGA Monitor Cable and follow proper installation procedures to ensure that your installation is done correctly, you should expect to receive many years of continuous analog signal operation from your existing projectors, KVMs, or industrial display systems, while providing you with an additional amount of time to decide if you want to move to a full-digital video solution.
If you’re interested in a bulk price quote, a custom-length cable, or OEM-labeled VGA Cables, SVGA Cables, or VGA Extension Cables, contact our factory sales department.
