BenQ TK700ST: problems, parts and running costs

Checked: 2026-10-21

Summary

The BenQ TK700ST is a lamp-based 4K short-throw projector, and what owners are most likely to meet are limits built into the design rather than breakdowns: no lens shift, 4K locked to 60 Hz, no streaming system inside, and a lamp rated 4000 hours in Normal mode. At or below about $1,500 it is a good buy for a bright 4K short-throw gaming projector with a 3-year warranty; above $1,800 the lamp makes it weak value next to the LED TK705i and the laser TK710.

Common problems and fixes

No exact-model owner threads were located, so what follows is the documented specification limits, the warranty terms and the measured data from the closely related TK700STi, not a failure-rate report.

No lens shift, so placement is corrected digitally — there is no lens shift on this model, and if the lens does not sit level with the middle of the screen the correction comes from 2D keystone (automatic vertical ±30°, horizontal ±30°) and picture rotation, with 1.2x manual zoom and a 0.9-1.08 throw ratio giving the slack around a 100-inch image at about 6.5 ft. There is nothing to fix, but the room has to be measured before the box is opened; nothing has failed, so the 3-year parts-and-labor warranty is not involved. [2][5]
4K runs at 60 Hz only and 240 Hz is a PC-only mode — BenQ publishes input lag of 16.7 ms at both 1080p/60 Hz and 4K/60 Hz, 8.3 ms at 1080p/120 Hz and 4.2 ms at 1080p/240 Hz, and the vertical scan range is 23-120 Hz, so 240 Hz needs a PC display. Consoles top out at 120 Hz, so on a console you get 1080p/120 Hz and no 4K above 60 Hz. Workaround: use a PC for the 240 Hz mode, or run the console at 1080p/120 Hz and accept 4K/60 Hz; no warranty question, nothing has failed. [2][5]
Measured lag on the sibling model runs slightly behind the spec sheet — the closest measured data comes from the TK700STi, which shares the same imaging engine: 17 ms at 4K/60 Hz against BenQ’s claimed 16.7 ms and 9 ms at 1080p/120 Hz against 8.3 ms claimed, while the 1080p/240 Hz figure was never measured. Treat the BenQ numbers as typical rather than guaranteed and leave a frame or two of margin in a competitive shooter; there is no setting that fixes this and it is not a warranty item. [6]
No smart system inside, so you need your own source and streamer — the TK700ST has no built-in smart platform; the “smart projector” label in some retailer copy belongs to the TK700STi, which bundles a QS01 Android TV dongle. You need a streaming stick, a game console or a laptop on one of the two HDMI inputs, and the single 5 W chambered speaker is the only built-in audio, so a soundbar or AVR takes over through the eARC HDMI audio return with Dolby Atmos pass-through. Not a fault and not a warranty item, simply what the box contains. [1][2][6][7]
Lamp life is short in Normal mode and lamp warranty terms are unpublished — the metal halide lamp is rated 4000 h in Normal, 8000 h in SmartEco, 10000 h in ECO and 15000 h in LampSave, and the warranty page states that the 3-year parts-and-labor term applies “except for lamps as specified below” while publishing no lamp term at all. Ask BenQ in writing which lamp coverage applies before buying; the warranty excludes normal wear and tear, and a lamp that reaches its own hours clock is wear rather than a defect. [2][3][5]
Depot service means you pay the freight to BenQ — service is depot-based: you ship the projector to BenQ and pay the freight there, while BenQ pays the return leg during the warranty period, and there is no advance replacement. A dead-on-arrival unit must be reported within 30 days, shipping damage within 7 business days, and the RMA number stays valid for 30 days. Workaround: photograph the unit and the packaging on arrival and file shipping damage claims inside that first week. [3]

Parts and consumables

Filter and cleaning supplies — no filter is named in the specification pages and no cleaning interval or filter part number is published for this model, so the sources give no filter cost to plan for; the warranty does exclude damage from an unsuitable environment and from non-BenQ parts. [2][3]

Yearly running cost

Not enough data for a single yearly figure, and this is how it is computed.

Everything else: no filter, no subscription and no streaming service come with it, since the TK700ST has no smart platform. A streaming stick and a soundbar are one-off purchases rather than running costs. [1][2][6]

When it is a good buy

ProjectorCentral lists $1,799 for the TK700ST (2026-10), with the LED TK705i at $1,699 and the laser TK710 at $1,966 in the same similar-model list. [5]

At or below about $1,500 — strong value for a bright 4K short-throw gaming projector with a 3-year warranty; the short-throw lens and the 4.2 ms 1080p/240 Hz mode are the reasons to pay this much.
$1,501 to $1,800 — fair; compare the TK705i and the TK710 on total cost of ownership, because both take the lamp out of the ownership plan.
Above $1,800 — weak unless you specifically need short-throw placement, because laser models become competitive at that money.

Named alternatives:

BenQ TK705i — LED at $1,699 (ProjectorCentral, 2026-10); the better choice when a longer light-source life and no lamp in the ownership plan matter more than the short-throw lens.
BenQ TK710 — laser at $1,966 (ProjectorCentral, 2026-10); the better choice when avoiding lamp replacement entirely matters more than the gaming latency.
BenQ TK700STi — the same chassis plus a bundled QS01 Android TV dongle; the better choice when you want streaming built in. Keep the model apart from the TK700 (standard throw, 3200 lumens), the TK710 and TK710STi (laser, 3200 lumens) and the TK705STi (LED). [1][4][5][6][7][8]