PC Screen doesn’t stop blinking/flickering when I turn my TV

troubleshooting a Flickering PC Screen When Connecting to a TV: A Guide for Gamers and Power Users

Are you experiencing persistent flickering or blinking on your PC screen whenever you turn on your TV? If so, you’re not alone. Many users with high-end graphics cards and multiple displays encounter display issues that can disrupt their workflow or gaming experience. This guide aims to help you understand the possible causes and effective solutions without sacrificing the features you rely on, such as G-Sync.

Understanding Your Setup

In this scenario, the user has a Windows 11 system equipped with an NVIDIA RTX 5070 graphics card, complemented by two high-refresh-rate monitors—LG Ultragear 144Hz with FreeSync and LG Ultragear 180Hz with G-Sync—and a TCL TV. The monitors are connected via DisplayPort, ensuring optimal performance, while the TV connects through HDMI.

The Problem

The user reports that upon turning on the TV, the monitor with G-Sync begins to flicker intermittently. This flickering isn’t consistently reproducible but occurs randomly. The typical workaround involves either turning off the TV, disconnecting the HDMI cable, or disabling G-Sync on the affected monitor temporarily.

Interestingly, the user notes that previously, with an AMD GPU and the same monitors, this issue did not occur. The question is whether a solution exists that preserves G-Sync functionality without disabling it when the TV is connected.

Possible Causes

1. HDMI and DisplayPort Signal Interference:
   Connecting multiple displays, especially with different synchronization technologies, can lead to signal conflicts or interference, particularly if cables or ports are mismatched or of subpar quality.

2. Synchronization Technology Conflicts:
   G-Sync and FreeSync work through variable refresh rate (VRR) technologies, which sometimes conflict when multiple VRR-enabled devices are connected, or when the system detects the TV as a primary display.

3. Driver or Firmware Compatibility:
   Outdated GPU drivers, monitor firmware, or TV firmware can cause incompatibility issues that manifest as flickering.

4. Power or Hardware Limitations:
   Insufficient power delivery or hardware limitations may cause instability when multiple high-refresh-rate displays are active.

Troubleshooting and Fixes

Here are some steps to resolve the flickering issue while maintaining G-Sync functionality:

1. Update All Drivers and Firmware:
2. Ensure your NVIDIA GPU drivers are up to date.
3. Update your