TH685i - Projector BENQ - Free user manual and instructions
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| Product Type | Video Projector |
| Brand | BenQ |
| Model | TH685i |
| Resolution | 1920 x 1080 (Full HD) |
| Brightness | 3500 ANSI Lumens |
| Contrast Ratio | 10,000:1 |
| Display Technology | DLP |
| Light Source | Lamp |
| Lamp Life (Normal) | Up to 4000 hours |
| Lamp Life (Eco) | Up to 10,000 hours |
| Input Lag | 8.3 ms (1080p 120Hz) |
| Refresh Rate | Up to 120Hz |
| Keystone Correction | Vertical ± 40 degrees |
| Zoom Ratio | 1.1x |
| Throw Ratio | 1.49 ~ 1.64 (100 inches @ 2.5m) |
| Built-in Speaker | 5W |
| Connectivity | HDMI (2), USB-A, RS232, Audio Out |
| Wireless Connectivity | Wi-Fi (optional via dongle), Bluetooth (optional) |
| Dimensions (W x H x D) | 312 x 110 x 225 mm |
| Weight | 2.79 kg |
| Power Consumption | Normal: 300W, Standby: <0.5W |
| Power Supply | AC 100-240V, 50/60Hz |
| Operating Temperature | 0°C to 40°C |
| Maintenance | Clean air filter every 100 hours; replace lamp when needed |
| Safety | Laser warning: Do not stare into beam; Class 1 laser product |
Frequently Asked Questions - TH685i BENQ
How do I connect my gaming console to the TH685i?
Use a high-speed HDMI cable to connect your console to one of the HDMI ports on the projector. Ensure the projector is set to the correct input source.
What is the recommended screen size for this projector?
The TH685i can project from 30 to 300 inches. For optimal brightness and gaming, a screen size of 100 to 120 inches is recommended.
How do I clean the air filter?
Turn off and unplug the projector. Remove the filter cover, take out the foam filter, and gently vacuum or clean it with water. Let it dry completely before reinstalling.
Why is the image blurry on the edges?
This may be due to keystone correction or lens focus. Adjust the focus ring and ensure the projector is perpendicular to the screen. For side placement, use vertical keystone correction.
Can I use the projector with a 4K source?
Yes, the TH685i accepts 4K signals via HDMI and downscales them to 1080p for display. It supports HDR10 and HLG.
How do I replace the lamp?
Allow the projector to cool, then remove the lamp cover on the bottom. Unscrew the old lamp, disconnect it, and install a new BenQ replacement lamp (model 5J.J8P05.001).
What is the input lag at 1080p 60Hz?
At 1080p 60Hz, the input lag is approximately 16.7 ms. At 1080p 120Hz, it drops to as low as 8.3 ms for a responsive gaming experience.
Does the projector have Bluetooth audio support?
Yes, with the optional BenQ QS01 dongle, you can connect Bluetooth speakers or headphones for wireless audio.
How do I reset the lamp timer?
After replacing the lamp, go to the System Setup menu, select 'Lamp Settings', and choose 'Reset Lamp Timer'. Confirm to clear the old timer.
What should I do if the projector overheats?
Check the air filter for dust and clean it if necessary. Ensure ventilation around the projector is not blocked. If issue persists, reduce ambient temperature or contact support.
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USER MANUAL TH685i BENQ
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Product information
Brand : BENQ
Model : TH685i
Category : Projector