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Samsung S90D Screen Flickering

D

Dopefabulous

n00b
Joined
Oct 31, 2011
Messages
35
Hello all,

I recently purchased the Samsung S90D to pair with my 4090 GPU. It's connected to 2.1 hdmi 48gb fiber optic 33 FT cable from RUIPRO. I tried tinkering with all possible settings like turning g-sync on and off, the TV 's game mode off and on, etc....but I still get screen flickering, not all the time but occasionally. I also tried a different 48gb fiber optic cable 2.1 hdmi cable but still flickers occasionally. According to the TV game mode menu, VRR off. Any idea on how to get rid of the flickering? Thanks in advance!
 
Have you tested your Samsung S90D with another source to make sure it's not the TV or cable? I assume your computer with the RTX 4090 works good with a monitor.
 
Yes, my computer with the 4090 works well with the monitor. I don't think cable length is an issues as the Ruipro cable was designed for long length while pushing 4k at 120 hz. These cables had no signal issues with my 4k 120 have LG TV.
 
Hey there,

Flickering on HDMI 2.1 setups like yours can be tricky — especially with longer fiber optic cables. A few things you can try:
  1. Check firmware updates – Make sure both your Samsung S90D and GPU drivers (including NVIDIA firmware for the 4090) are fully up to date. Samsung has released patches for VRR-related flicker on some models.
  2. Use certified cables – RUIPRO cables are usually good, but long 33 ft runs can sometimes introduce signal instability, even if rated for 48Gbps. If possible, test with a shorter cable (under 6 ft) just to confirm it’s not the distance.
  3. Force refresh rate / VRR settings – Try locking the TV and GPU to a fixed 120Hz (VRR off) and see if flickering stops. If it does, the issue might be with VRR handshake.
  4. Change input settings on TV – Under “External Device Manager” → “Input Signal Plus,” make sure it’s enabled for that HDMI port. Also try toggling Game Mode and see if PC Mode improves stability.
  5. Power cycle and reseat connections – Unplug both devices, wait 30 seconds, and reseat the HDMI cable firmly on both ends.

If the flickering persists even with a short cable and fixed refresh rate, it’s likely a firmware or HDMI port compatibility issue — you might want to reach out to Samsung support with your exact firmware version and GPU driver details.
 
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