HDMI splitter shows picture on only one screen

Start by identifying which screen works, which output port it uses, and whether the display is powered on and set to the right HDMI input. Then swap the two output cables at the splitter, leaving the source and screens otherwise unchanged. If the failure follows a display/cable, investigate that path; if it stays on one splitter output, check the splitter manual and port indicators. OREI and Monoprice support guides recommend swapping cables/displays and checking each output to isolate the failing branch.

1. Confirm the splitter has power and its status lights match the model manual; verify both TVs are on the correct inputs.

   Each display should be ready to accept the splitter’s signal on its connected port.

   If that does not help: If the splitter power indicator is off or abnormal, check its supplied power adapter and support instructions.

2. Swap the output cables or swap the displays between splitter ports, changing one thing at a time.

   If the problem moves, it follows the cable/display; if it stays at the same output, the splitter port is a stronger lead.

   If that does not help: Restore the original arrangement after recording the result; avoid repeated hot-plugging if a product manual says to power off first.

3. Connect the source directly to each display using the same source output mode, if practical.

   If both displays work directly, the shared splitter negotiation or capabilities become more likely.

   If that does not help: If one display also fails directly, troubleshoot that display/source path before changing splitter EDID settings.

With multiple displays, the splitter may use EDID information to determine what formats the source should send. Atlona explains that a source sending one signal to several displays may encounter EDID incompatibility if a display cannot accept the selected mode. OREI documents models that can compare display capabilities or force a shared EDID. The exact behavior and controls vary by splitter; do not copy another model’s DIP-switch positions or assume the highest-resolution display sets the output.

1. Check each display manual for supported resolution, refresh rate, HDR, and HDCP requirements on the HDMI input in use.

   A mode supported by both screens provides a useful baseline for the shared splitter output.

   If that does not help: If the displays have no overlapping supported mode for the source’s required signal, a splitter may not be able to show that source on both screens simultaneously.

2. Set the source temporarily to a lower common mode only if the source manual documents how to do so safely.

   If both displays now work, the limitation is related to signal-mode compatibility rather than necessarily a defective output.

   If that does not help: Restore the preferred mode if it does not help and proceed with cable/port evidence.

3. Use EDID management only according to the exact splitter manual, noting which display’s capabilities it copies or combines.

   A supported common EDID setting may let the source send a mode the connected displays can all accept.

   If that does not help: If the settings are unclear, do not experiment with switches; contact the splitter maker with the model number and both display models.

If menus or unprotected content display on both screens but a streaming player, disc, or other protected source goes blank on one, HDCP compatibility may be involved. OREI’s model-specific guidance notes that an output with lower or absent HDCP support can fail to show protected content even when another display works. This is not permission to bypass copy protection; use equipment that supports the content’s required protection level and follow the source/splitter manuals.

1. Compare the source menu or an ordinary local screen with the protected title, then note whether only the protected content fails.

   A protected-content-only difference points toward the devices’ supported HDCP versions or signal chain.

   If that does not help: If all video fails on that output, return to cable, port, EDID, and display tests.

2. Check the splitter and both display specifications for the protection format required by the source/content.

   A complete compatible chain is necessary for protected playback on each connected display.

   If that does not help: If one display lacks the needed support, use a supported display path rather than attempting to disable or circumvent HDCP.

1. Use short, known-good cables appropriate to the source mode at the input and outputs, and check that all plugs are secure.

   If a cable swap restores the second display, the original cable or connector path may be involved.

   If that does not help: If the issue persists, stop replacing cables and check mode compatibility and splitter guidance.

2. Power-cycle the source, splitter, and displays in the sequence specified by their manufacturers.

   A fresh connection negotiation may restore output after a transient detection problem.

   If that does not help: If only one screen remains blank after restart, repeat the output swap test and share the pattern with support.

3. Test another source device or another display only if available, recording the exact combinations that work.

   The matrix of working/failing combinations helps distinguish source, splitter, output, and display causes.

   If that does not help: Do not buy replacement equipment just to run a test; report what could and could not be checked.

Share the splitter model, source, both display models, resolution/refresh/HDR mode, HDCP behavior if known, cable lengths/types, output-port swap results, and any EDID setting tested. If the issue stays on one splitter port across displays and cables, ask the maker about that output. If failure follows a TV, contact that display’s manufacturer. A single working screen does not alone prove the splitter is defective or that both displays are compatible with the same signal.

• OREI splitter one-output troubleshooting — checked 2026-10-24
• Atlona splitter EDID issue when one display is missing — checked 2026-10-24
• Monoprice HDMI splitter troubleshooting manual — checked 2026-10-24

Why does an HDMI splitter work on one TV but not the other?

The failure may follow one cable, display, or splitter output, or the two displays may not share a supported signal mode. Swap outputs and test each display directly before changing EDID settings.

Can different TV resolutions cause one splitter screen to go blank?

Yes. A splitter sends a shared signal, and its EDID behavior determines how the source chooses a mode. Check the splitter manual and both display specifications for a common supported mode.

What is EDID on an HDMI splitter?

EDID is display capability information used in source-to-display mode negotiation. Splitter implementations differ; use only the EDID controls and instructions documented for your model.