FAQ
TL;DR: "The problem was that the bar supports 60 fps." Force 60 Hz on PS5/Xbox or bypass the MOES for 120 fps titles to keep video and lighting stable. This FAQ helps Samsung QE55Q77DAT owners integrate a MOES HDMI 2.0 backlight with a 2.1 switch, two consoles, and a TV decoder. [Elektroda, lukasz10874, post #21398306]
Why it matters: It shows how to keep ambient lighting without losing video when 120 Hz handshakes confuse your Samsung.
- HDMI 2.0 paths typically cap at 4K60 with 18 Gbps bandwidth, impacting 120 Hz gaming. [HDMI LA, 2016]
- HDMI 2.1 supports up to 48 Gbps and 4K120, but the chain is limited by the weakest link. [HDMI Forum, 2017]
- With the MOES inline, Samsung auto‑detect can rename the port, then drop signal after ~5 seconds. [Elektroda, lukasz10874, post #21394967]
- The 2.1 switch works normally when the MOES box is removed from the chain. [Elektroda, lukasz10874, post #21395323]
- The MOES "bar" works at 60 fps; 120 fps titles can break ambient sync (e.g., Monster Hunter Rise on PS5). [Elektroda, lukasz10874, post #21398306]
Quick Facts
- HDMI 2.0 paths typically cap at 4K60 with 18 Gbps bandwidth, impacting 120 Hz gaming. [HDMI LA, 2016]
- HDMI 2.1 supports up to 48 Gbps and 4K120, but the chain is limited by the weakest link. [HDMI Forum, 2017]
- With the MOES inline, Samsung auto‑detect can rename the port, then drop signal after ~5 seconds. [Elektroda, lukasz10874, post #21394967]
- The 2.1 switch works normally when the MOES box is removed from the chain. [Elektroda, lukasz10874, post #21395323]
- The MOES "bar" works at 60 fps; 120 fps titles can break ambient sync (e.g., Monster Hunter Rise on PS5). [Elektroda, lukasz10874, post #21398306]
What’s the correct connection order for MOES, HDMI 2.1 switch, PS5/Xbox, and a TV decoder?
Connect each source (PS5, Xbox, decoder) to the HDMI 2.1 switch inputs. Connect the switch’s output to the MOES HDMI IN. Connect MOES HDMI OUT to the TV’s HDMI input. Power the MOES via USB, then select the switch input. This order preserves switching and sync. If you need 120 Hz, bypass the MOES for that session. [Elektroda, karolrkd, post #21394121]
Why do I get a picture for five seconds, then “no device” on the Samsung?
Samsung auto-detection renames the input, then the HDMI handshake fails through the MOES. The TV reports “no device” even though it’s on. This behavior appears when the MOES is inline with consoles. It does not occur when only the switch is used. Force 60 Hz or remove the MOES to confirm. [Elektroda, lukasz10874, post #21394967]
Can the MOES 4K HDMI 2.0 sync box pass 120 Hz from PS5 or Xbox?
No. It works at 60 fps. When a game enables 120 fps, the bar stops syncing and video can drop. The user confirmed Monster Hunter Rise on PS5 triggered the failure. Set the console to 60 Hz to restore operation. [Elektroda, lukasz10874, post #21398306]
How do I keep ambient lights and avoid 120 Hz handshake issues?
Use 60 Hz when you want the MOES lights active. For 120 fps titles, route the console directly to the TV. Then reinsert the MOES when you return to 60 Hz games or video. This strategy preserves both gameplay and lighting. [Elektroda, lukasz10874, post #21398306]
Should I disable HDMI‑CEC (Anynet+) on the affected input?
Yes, it can help if auto-detection is causing the drop. As one expert advised: "Have you tried the on/Off HDMI-CEC option on this HDMI input." Toggle Anynet+ for that HDMI to test behavior. Reconfigure devices after changing CEC. [Elektroda, karolrkd, post #21395012]
Will Game Mode, HDR, or picture mode changes fix the blackout?
No. Changing picture modes does not solve a 120 fps incompatibility. The refresh rate setting is the root cause in this case. Keep the output at 60 Hz when using the MOES bar. [Elektroda, lukasz10874, post #21398306]
My HDMI 2.1 switch works without the MOES—what does that mean?
It shows the switch and cables are fine. The issue appears only when the MOES is inserted. That points to a compatibility or handshake limit with the bar. Continue using the switch alone for 120 Hz sessions. [Elektroda, lukasz10874, post #21395323]
Could bad HDMI cables be causing this?
Unlikely here. New and old cables both worked when tested directly with the switch and console. The problem returned only with the MOES in the chain. Keep your current cables if they already pass a stable signal. [Elektroda, lukasz10874, post #21394967]
Does Samsung’s Connection Guide help diagnose this?
It confirms basic wiring and power. The guide showed no issues, yet the bar lit only when the switch was unplugged. That points beyond cabling to refresh or handshake constraints. Use the guide, then test 60 Hz output. [Elektroda, lukasz10874, post #21395000]
Which scenarios most often trigger the failure?
Titles that enable 120 fps are the common trigger. In the thread, Monster Hunter Rise on PS5 caused the issue. After the TV advertised 120 Hz capability, the bar stopped working. Switch back to 60 Hz to restore lighting. [Elektroda, lukasz10874, post #21398306]
How can I quickly confirm if refresh rate is the culprit?
Force the console to 60 Hz or 4K60. Alternatively, set 1080p60 temporarily. If video stabilizes and lights work, 120 Hz was the cause. Return to 4K60 for normal use with the MOES. [Elektroda, lukasz10874, post #21398306]
How do I wire and power everything? (3‑step How‑To)
Follow this chain for initial setup:
- Connect PS5, Xbox, and decoder to the HDMI 2.1 switch inputs.
- Connect the switch output to MOES HDMI IN, then MOES HDMI OUT to the TV.
- Power the MOES, select the switch input, and verify 60 Hz output.
This mirrors the shared connection diagrams. [Elektroda, karolrkd, post #21394121]
Can I manually add or edit the device in Samsung’s source list to fix it?
The TV offers only an Edit option in this case, which did not change behavior. Manual add did not provide a workaround. Focus instead on refresh rate and CEC settings. [Elektroda, lukasz10874, post #21395654]
Will a 2.1 switch give me 4K120 if the MOES box stays in the chain?
No. An HDMI chain is limited by its lowest-spec device. HDMI 2.1 supports up to 48 Gbps and 4K120, but the MOES is HDMI 2.0. Expect a 4K60 ceiling when the bar is inline. [HDMI Forum, 2017]
Which TV HDMI port and settings should I use on the QE55Q77DAT?
Use any stable HDMI port, then enable Input Signal Plus for higher-bandwidth modes on that port. If CEC renaming disrupts detection, toggle Anynet+ off for that input. Reboot devices after changes. [Samsung Support, 2023]
