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Fixing LG OLED C4 HDMI Issues

Solve black screens, flickering, and handshake failures with these essential technical troubleshooting steps.

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Understanding The HDMI Handshake

The 48Gbps transition requires the TV and source to sync instantly to avoid signal loss.

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Why VRR Causes Flickering

Variable Refresh Rate constantly renegotiates sync timing, causing blackouts if packet loss occurs during the switch.

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HDMI 2.1 Bandwidth Realities

Older cables lack the 48Gbps capacity needed for 4K/144Hz, forcing your system into lower bandwidth modes.

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Certified Cables Are Mandatory

Always use cables with the Ultra High Speed QR code to ensure reliable 2.1 signal integrity.

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