BenQ TK700 vs TK705i: 705i skips lamp replacements, USB video needs compatibility

Check these before buying

• Confirm the exact US TK700 or TK705i selection and its included accessories. TK700ST, TK700STi and TK705STi are different models. A stand, mount, spare lamp or streaming bundle is not included merely because a related listing shows one. Check current seller, condition and return terms. This page asserts no current price, availability or delivery date.
• For TK700, use a compatible HDMI output or an adapter that explicitly supports your laptop and intended signal. Check resolution, refresh rate, audio and any copy-protection requirements across the whole route. Its USB Type-A port supplies power and cannot replace an HDMI video connection. A generic FAQ mentioning direct USB-C does not match this exact model’s connector map.
• For TK705i direct USB-C video, first confirm DP Alt Mode in the laptop’s documentation. Use a certified USB-C 3.0 video cable, connect it to the projector’s USB-C port and select that source. If necessary, enable the laptop’s external display. The manual lists 1920 by 1080 at 60 Hz among its USB-C PC timings. Check the exact desired mode rather than inferring it from the connector name or the projector’s 4K label.
• TK705i USB-C power delivery is available only with the included projector power adapter. Its listed profiles are 5 V at 2 A, 9 V at 2 A, 12 V at 1.5 A and 15 V at 2 A, with 30 W the largest product of voltage and current. The connected device must support USB power-delivery charging. A separately purchased cable must be USB-IF-certified and full-featured for power delivery as well as meeting the video requirement. Compatibility is not guaranteed. Use the laptop’s own charger if it requires more power for operation or startup.
• Keep video and audio compatibility distinct. TK705i’s USB-C manual lists two-channel LPCM audio and specified sample rates. Do not assume every surround format is carried over USB-C. Some computer HDMI outputs do not transmit audio and need a separate supported audio connection. TK705i’s Bluetooth-headphone instructions are for its Google TV source, so they do not establish Bluetooth sound from a connected laptop or HDMI console.
• TK700’s lamp loses brightness with use. The manual’s specific replacement section is marked for service personnel only and says to consult the dealer or BenQ when a replacement message or LIGHT warning appears. Although its general safety section calls the lamp user-serviceable, this comparison follows the stricter replacement instruction and does not recommend opening the lamp cover yourself. The final lamp warning requires replacement before normal operation resumes. Ask about exact replacement-part availability, service cost and turnaround before buying for frequent use.
• TK705i uses an LED light source. Its maintenance section requires lens cleaning and directs failures to the dealer or service center. Do not remove parts or assume its light source is a user-replaceable module. Removing the lamp-consumable task does not remove dust, cooling needs, electronics faults or possible professional service.
• Clean either lens only after switching off and allowing complete cooling. Follow its manual’s lens-cleaning method when dirt or dust is visible, using appropriate lens paper or a soft cloth with lens cleaner for smears. Avoid abrasive pads and volatile solvents. Follow proper shutdown and unplug TK700 before case cleaning. Do not mistake occasional cleaning for scheduled lamp replacement.
• TK700’s US page lists 4,000 hours in Normal, 10,000 in ECO, 8,000 in SmartEco and 15,000 in LampSave. TK705i lists 20,000 in Normal and 30,000 in Eco. These are mode-dependent manufacturer light-source ratings, not guaranteed failure dates, warranted whole-projector lifespans or a calculation of years of trouble-free use. TK700’s ECO setting lowers brightness, and its equivalent lamp-hour counter weights different modes. Neither published life rating establishes your eventual repair cost.
• Measure from the lens to the screen and divide by image width when checking throw ratio. TK700 spans 1.127 to 1.46 and TK705i spans 1.0 to 1.3. Use the exact model’s image-size table and height diagram, then test the actual projection before permanent installation. On a table use a stable, level surface, with separate space for chassis and cable bends. Both manuals require at least 50 cm from walls and free airflow. Neither an optical match nor digital keystone makes a confined cabinet suitable.
• For a lower-latency gaming setup, read the exact model’s mode instructions. TK700 calls for zero keystone, Auto Vertical Keystone off and Aspect Auto. TK705i Gaming Boost applies in RPG, FPS, HDR RPG or HDR FPS modes on HDMI or USB-C, resets keystone to zero and requires perpendicular placement. Its ALLM instructions apply to HDMI. Do not combine automatic geometry correction with a lowest-lag promise. No measured latency comparison is made here.
• If a particular high-refresh mode is essential, pause this purchase decision until BenQ confirms the exact resolution, input, source and firmware. TK705i’s US page and manual disagree on scan range, and a broad range is not a supported-timing list. This comparison establishes neither a 60 Hz ceiling nor 120 Hz support for TK705i, and does not choose TK700 as a high-refresh workaround.
• Compare the current total for the exact condition and package, including any needed HDMI adapter, video cable, streamer and mounting equipment. Add taxes and delivery where applicable. TK700’s QS01 streamer is optional. TK705i’s Google TV still needs setup, a suitable network and any required app accounts or subscriptions. A lower upfront total does not prove lower total ownership cost once lamp service and repairs are considered.