Common symptoms

• Projector shows “No Signal”, brand logo, or screensaver after HDMI is connected.
• Signal appears briefly when cable is wiggled → likely loose/damaged cable or port.
• Source works on TV but not on projector → often EDID/HDCP or resolution mismatch.

Quick 60-second fixes

1. Set the projector input: press Input/Source until you reach HDMI 1/2 (exact port you used).
2. Power cycle (handshake reset): unplug projector & source for 20–30s → plug HDMI → power on projector → then the source.
3. Try another HDMI cable/port: use a short, known-good cable; avoid through-the-wall extenders initially.
4. Lower the source output: set 1080p @ 60 Hz (avoid 4K/HDR for first test).

Full troubleshooting (step-by-step)

1) Cable & port sanity checks

• Inspect cable ends; reseat firmly until you feel a click. Try a different port on the projector (HDMI 1 ↔ HDMI 2).
• If using adapters (USB-C→HDMI, DP→HDMI, HDMI→VGA), test without the adapter if possible. Use active adapters for DP/USB-C.

2) Resolution & refresh match

• Projector-friendly baseline: 1920×1080 @ 60 Hz. Turn HDR off for first test.
• For older/portable projectors, also try 1280×720 @ 60 Hz.

3) HDCP/EDID handshake

• Power order matters: connect HDMI → projector ON → source ON.
• Remove splitters/AVRs first. If needed later, use quality splitters that pass HDCP and correct EDID.

4) Source settings (audio/video)

• Ensure the source is set to mirror/extend to the projector (not “PC screen only”).
• Turn off fixed VRR/120 Hz modes during testing; some projectors accept 60 Hz only.

5) Still no joy?

• Test the same source + cable on a TV. If it works there but not on the projector, it’s likely handshake or format related.
• Try another source (phone/TV stick/laptop) on the projector to isolate which device is at fault.
• If the signal only appears when you push the plug, suspect a worn HDMI port — contact service.

Note: Older guides often suggest opening the projector and replacing ports yourself. We don’t recommend disassembly due to warranty and damage risk. Seek service instead. :contentReference[oaicite:1]{index=1}

Device-specific quick tips

Windows laptop (HDMI/USB-C)

• Press Win + P → choose Duplicate or Second screen only.
• Settings → System → Display → Multiple displays → Detect. Set Resolution = 1920×1080, Refresh = 60 Hz.
• USB-C? Use a USB-C→HDMI adapter with DP Alt-Mode.

Mac

• System Settings → Displays → hold Option to show Detect Displays.
• Set 1080p 60 Hz; disable HDR initially.
• USB-C/Thunderbolt to HDMI: use a reputable active adapter/cable.

TV sticks (Chromecast/Fire TV) & Android boxes

• Use the included power adapter (not TV USB power). Weak power = handshake failures.
• Display settings → choose 1080p 60 Hz. Turn off “Match content frame rate” while testing.

Game consoles

• Set video mode to 1080p; disable 120 Hz/VRR/HDR for initial test.
• Try another HDMI port on the projector, then another cable.

বাংলা সারাংশ

প্রোজেক্টরে HDMI দিলেই “No Signal” দেখালে প্রথমে সঠিক Input/Source নিন, পাওয়ার সাইকেল করুন (HDMI লাগিয়ে প্রোজেক্টর অন → তারপর সোর্স অন), এবং ছোট, ভালো HDMI কেবল ট্রাই করুন। সোর্সের রেজোলিউশন 1080p 60 Hz দিন, HDR/120 Hz বন্ধ রাখুন। অ্যাডাপ্টার থাকলে (USB-C/DP→HDMI) বিকল্প কেবল/অ্যাকটিভ অ্যাডাপ্টার ব্যবহার করে দেখুন।

References

• HDMI basics
• HDCP (handshake & content protection)
• EDID (how displays tell sources what they support)
• Throw ratio (distance vs screen size)