Connecting a PC to a Samsung TV over HDMI runs into two Samsung-specific settings more than anything else: Input Signal Plus, which a port needs for a full-bandwidth PC signal, and labeling the input as "PC," which unlocks sharp text and low lag. Get those right and most "no signal" or "blurry text" complaints disappear.
If there's no signal at all
- Select the right input and reseat. Press Source, pick the exact HDMI, and reseat the cable at both ends.
- Turn on Input Signal Plus for that port. Settings > General > External Device Manager > Input Signal Plus (or HDMI UHD Color on older sets), enabled for the HDMI the PC uses. Without it, the port runs a limited mode that can drop a 4K or high-refresh PC signal to a black screen — the same setting behind a Samsung HDMI "No Signal".
- Drop the PC's output, then climb back. On the PC, set the display to 1080p 60Hz to get a picture, then raise to 4K/120 once it's stable. A PC pushing a mode the port can't take shows as no signal.
- Swap the cable for 4K. A 1080p-era cable can't carry 4K 60Hz — use a certified Ultra High Speed cable for anything above basic HD.
If it connects but looks soft, laggy, or the edges are cut off
This is the fix people don't know about — label the input as "PC." With the PC's HDMI selected, open Source, highlight that input, and rename/set its icon to PC. Doing so:
- enables full 4:4:4 chroma, which is what makes small text crisp instead of fuzzy and color-fringed,
- engages PC mode for much lower input lag (important for any interactive use),
- and turns off overscan, so the desktop edges stop getting cut off.
After labeling it PC, set Windows display scaling to 100% (or your preference) and confirm the resolution matches the TV's native 4K.
FAQ
Why does my PC show "No Signal" on the Samsung TV? Usually Input Signal Plus is off for that port, or the PC is outputting a mode the port can't take. Enable Input Signal Plus and set the PC to 1080p60 first.
Why is text blurry from my PC? The input isn't in PC mode, so it's not using 4:4:4 chroma. Label the HDMI input as "PC" in the Source menu and the text sharpens. If color looks wrong beyond just soft text, work the HDMI picture and HDR fixes too.
My desktop edges are cut off. That's overscan. Labeling the input as PC turns it off; otherwise look for an Aspect Ratio / "Screen Fit / 1:1" setting.
The mouse feels laggy on the TV. Set the input to PC (or Game) mode — that drops input lag dramatically versus the standard picture modes.