General TV Specifications 

• Display: 75-inch Class Crystal UHD
• Processor: Crystal Processor 4K with 4K UHD Upscaling
• Color: PurColor
• Features: 4K resolution, HDR support (low peak brightness)
• Connectivity: Multiple HDMI ports, built-in Wi-Fi

Troubleshooting Steps for HDMI Issues

Disconnect and Reconnect: 

Unplug the HDMI cable from both the TV and the external device. 

Power Cycle: 

Disconnect the power cords for both the TV and the external device for at least 10 seconds, then reconnect them. 

Check Connections: 

Firmly reconnect the HDMI cable to the external device first, then to the TV. 

Try a Different Port: 

Connect the cable to a different HDMI port on the TV and select the corresponding input source. 

Use a Different Cable: 

Try a different, certified HDMI cable, as a faulty cable can cause issues. 

Enable Anynet+ (HDMI-CEC): 

In the TV settings, navigate to Settings > General > External Device Manager, and ensure Anynet+ is turned on. 

Perform the HDMI Cable Test: 

Go to Settings > Support > Device Care > Self diagnosis, then select HDMI Cable test and check each connected port. 

Check the Source: 

Make sure the TV's input source (found in the Source list) matches the connected device and HDMI port. 

Clean the Ports: 

If issues persist, gently clean the HDMI ports on the TV with compressed air or a soft brush to remove dust and debris. 

If the issue continues, perform a factory reset by going to Settings > General > Reset and entering the default PIN (typically 0000).