Introduction
This guide helps you troubleshoot the most common issues reported with the OREI BK-4927 8K 4-Port HDMI Switch with HDMI Audio, 3.5 mm, and Optical outputs. If you are experiencing audio, video, switching, power, or compatibility problems, use the steps below to identify the cause and restore normal operation.
Issue description
The BK-4927 is designed to route HDMI video and extract audio through OUT 2, 3.5 mm, and optical outputs. Most issues are caused by EDID settings, HDMI handshake problems, cable or power issues, or device compatibility settings such as eARC, ARC, and CEC.
Signs
No sound from OUT 2, optical, or 3.5 mm output
eARC light is blinking or never establishes a connection
No video, black screen, or signal not detected
The switch does not auto-switch to the active input
The unit will not power on or all LEDs go dark
The picture or audio cuts in and out after power cycling
Basic troubleshooting steps
Confirm the power adapter is 5V 1A and the barrel connector is the correct size: 5.5 mm / 2.5 mm.
Use certified HDMI cables and keep cable lengths as short as possible during testing.
Power off the TV, the switch, and the source device, then power them back on in this order: TV, switch, source device.
Test with one source device connected directly to the switch and one display connected to OUT 1.
Disable CEC, HDMI Device Link, or similar control features on the source device and TV if you are seeing handshake or auto-switching issues.
Check the TV audio settings and confirm the correct output mode is selected.
Advanced troubleshooting steps
1. No audio output or audio not working
If you do not hear sound from OUT 2, the optical port, or the 3.5 mm output, the issue is usually related to EDID, audio format, or the connected TV or receiver settings.
Set the EDID switch to PASS if you want the switch to copy the audio EDID from OUT 1.
If PASS does not work, try a manual EDID mode that matches your audio system, such as 2.1 or 7.1.
Confirm the TV or audio device supports the format being sent. Some devices do not support Dolby Atmos, LPCM 5.1, or LPCM 7.1 over every output path.
For optical output, use a TOSLINK optical cable and confirm the receiving soundbar or receiver is set to the optical input.
For 3.5 mm output, verify the connected device accepts analog stereo audio.
If you are using a game console or streaming device, test with a simpler audio format such as stereo or Dolby Digital instead of Dolby Atmos.
2. eARC LED blinking or eARC not establishing
A blinking eARC indicator usually means the TV and switch are not completing the eARC handshake.
Make sure the TV is connected to the correct HDMI port that supports eARC or ARC.
Use a high-quality HDMI cable rated for the required bandwidth.
If your TV does not support eARC, disable eARC in the TV settings and use ARC or pass-through mode instead.
Power cycle the TV, switch, and audio device, then reconnect the HDMI cable to the eARC port.
3. No video output or signal not detected
If a source such as DirecTV Genie, Dish Joey, or PS5 does not pass video through the switch, the issue is often an HDMI handshake problem.
Turn off the source device, the switch, and the TV.
Disconnect and reconnect the HDMI cables on both the input and output sides.
Disable CEC, HDMI Device Link, or similar features on the source device and TV.
Test the source device directly with the TV to confirm the source is outputting video correctly.
If possible, test with a different HDMI cable or a different source device to isolate the problem.
4. Device not auto-switching inputs
If the switch does not move to the active source automatically, another connected device may be taking priority or sending a wake signal.
Disconnect devices that are not being tested, then reconnect them one at a time.
Disable HDMI-CEC, HDMI Device Link, or similar features on Apple TV, PS5, and the TV.
If Apple TV powers on through eARC or CEC and takes priority, change its CEC settings or power behavior.
Manually select the desired input on the switch to confirm the source is working.
5. Unit not powering on or LEDs going dark
If the unit stops powering on or all LEDs go out, the most common cause is an incorrect or unstable power supply.
Verify the adapter is rated for 5V 1A.
Confirm the barrel connector is 5.5 mm / 2.5 mm.
Try a different known-good power adapter with the same rating if available.
Inspect the power cable and connector for looseness or damage.
6. Intermittent connection or cycling on and off
If the signal appears and then drops to a black screen, especially after power cycling the TV and switch together, the source device may need to renegotiate the HDMI handshake.
Power off the source device completely, not just the TV and switch.
Wait 30 seconds, then power on the TV, switch, and source device in sequence.
Replace the HDMI cable between the source and the switch if the issue continues.
Test the source device directly on the TV to determine whether the issue is caused by the source or the switch.
7. Firmware update requests
If you are asking about firmware updates for the BK-4927, contact support to confirm whether a firmware update is available for your unit and whether it applies to your issue.
8. EDID settings confusion
EDID controls what audio and video formats the source device sees as supported. Choosing the right mode can resolve many audio and compatibility problems.
Use PASS mode when you want the switch to copy the EDID from OUT 1.
Use a manual EDID mode such as 7.1 when your receiver or soundbar supports multichannel audio and you want to force that format.
Use 2.1 or a lower audio mode if the connected audio device does not support advanced surround formats.
If audio fails after changing EDID, power cycle the source device so it reads the new setting.
9. Non-eARC TV compatibility
The BK-4927 can work with ARC and pass-through setups, not only eARC TVs. If your TV does not support eARC, you can still use the unit by disabling eARC on the TV and using ARC or pass-through mode.
Turn off eARC in the TV audio settings if the TV is not eARC-compatible.
Connect the TV to the correct HDMI ARC or eARC port if ARC audio is being used.
Use the appropriate EDID setting for your audio system.
10. Audio format support questions
For best results, confirm that your source device, TV, and audio system all support the format you want to use. If you are unsure, start with a simpler format and then increase quality after the system is stable.
LPCM 5.1 support depends on the connected audio device and EDID mode.
Dolby Digital Plus and HDR10+ passthrough depend on the source device, display, and receiver chain.
If advanced audio fails, test with stereo audio first, then move to surround formats.
Contact support
Contact OREI support if the steps in this guide do not resolve the issue, or if you need help confirming compatibility, EDID settings, or firmware availability. When you reach out, include your source device model, TV or receiver model, cable types, EDID setting, and a short description of the problem.
Additional resources
For faster troubleshooting, keep your HDMI cables, power adapter, and connected device model numbers available before contacting support. If you need more help, refer to related OREI product documentation or setup guides for HDMI switching, ARC, and eARC configurations.
Conclusion
Most BK-4927 issues can be resolved by checking power, cables, EDID, audio format settings, and HDMI handshake behavior. If the problem continues after trying the steps above, support can help you narrow down whether the issue is related to the source device, display, audio system, or the switch itself.
Disclaimer
Troubleshooting results may vary depending on your connected devices, cable quality, and system configuration. Use the steps in this guide at your discretion, and contact support if you are unsure about any setting or connection.
Comments
0 comments
Please sign in to leave a comment.