benqprojectorrepair

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Wells Electronics • Technical Guide

Lamp‑Based BenQ Projector Repairs

This page focuses exclusively on lamp (UHP) BenQ projectors (MS/MX/MW/MH/W/TH and certain TK variants). It covers typical symptoms, practical troubleshooting, and the most common error indicators you’ll encounter on these models.

Typical Symptoms of Lamp‑Based Models

Image / Light Symptoms

  • Dim or yellow/green‑biased picture after warm‑up → lamp near end‑of‑life or optics dust.
  • Flicker or multiple strike attempts on power‑on → fatigued lamp or ballast ignition instability.
  • White spots / “starry sky” that multiply → DMD failure (stuck micromirrors).
  • Rainbow artifacts / whine → colour wheel bearing wear or sensor timing error.

Noise / Thermal / Power

  • Loud ramping fans & shutdowns → clogged ducts, failing fans, or bad temp sensor.
  • “Overheating” while fans spin → burnt fan controller ICs or invalid tach feedback.
  • No power / standby only → PSU rails out of spec, fuse/NTC, or mainboard short.
  • Intermittent HDMI / HDCP → loose connector, ESD array or retimer issues.

Tip: Note when the symptom appears (cold start, after 10–20 minutes, or only at high brightness). Timing often points directly to the failing subsystem.

Step‑by‑Step Troubleshooting Guides

Lamp Won’t Strike / Projector Cycles On–Off

  1. Record lamp hours. If near rated life, fit a known‑good lamp (avoid unbranded bulbs).
  2. Inspect the lamp housing: look for arc tube darkening, cracks, or deposits.
  3. Check the lamp door switch and interlocks; reseat connectors.
  4. Scope ballast output during ignition; verify proper waveform and duration.
  5. Clean intakes/filters; confirm fans reach target RPM before strike.
  6. After replacement, reset lamp hours and perform brightness/colour checks.

Fan Noise, “Temp” Warning, or Thermal Shutdown

  1. Blow out dust away from the optics; visually inspect ducts and heatsinks.
  2. Read tach feedback (service menu if available); replace slow or rattling fans.
  3. Test PWM/TACH lines to the controller IC; if fans spin but tach reads invalid, replace the controller board/IC.
  4. Verify thermistor sensors with a DMM; replace if drifted.
  5. Re‑paste key heatsinks (DMD, power semis); confirm stable temps during a 30‑minute soak.

White Spots / Stuck Pixels (DMD Failure)

  1. Confirm on multiple inputs/resolutions; the artifact is panel‑level, not signal‑level.
  2. Inspect for dust on optics; if spots remain perfectly fixed frame‑to‑frame, proceed.
  3. Replace DMD with correct part code; observe ESD precautions and torque specs.
  4. Re‑seat heatsink with fresh thermal compound; verify uniform focus and geometry.
  5. Run a full‑field grey and colour uniformity check; log results.

Colour Wheel Noise / Rainbowing

  1. Listen at low brightness for bearing whine or scraping.
  2. Check the Hall sensor signal; if unstable, replace wheel and align timing.
  3. Ensure no cable rub or debris in the wheel shroud; reassemble and test for artifacts.

Common parts you may encounter: UHP Lamp Ballast Colour Wheel Fan(s) Fan Controller IC DMD Mainboard PSU

Error Codes & Indicators

Wording varies by model; always note LED colour/patterns in addition to on‑screen text.

Indicator / MessageWhat It Usually MeansNext Step
Lamp Warning / Replace Lamp Lamp end‑of‑life or ballast misfire Check hours; fit known‑good lamp; test ballast ignition
Temp Warning / Overheating Dust blockage, failed fan or sensor Clean ducts; verify fan RPM; test thermistors; re‑paste heatsinks
Fan Error / Fan Lock No/invalid tach signal Replace fan; inspect fan controller IC and cabling
Warning LED patterns only Firmware/PSU protective trip Capture LED colours/pattern; perform power/rail checks; read logs
White Spots on Image (not a code) DMD failure – stuck micromirrors Replace DMD; verify cooling and optics cleanliness
Wells Electronics • Technical Guide

BlueCore Laser BenQ Projector Repairs

This page covers BlueCore laser BenQ models (LU/LK/LW/LX/LH series). It focuses on common issues specific to laser light engines, a safe diagnostic flow, and the error indicators you’re most likely to see.

Common Issues

Light / Optics

  • Unexpected dimming or colour shift → thermal derating or optics contamination.
  • Uniformity issues (tinting toward corners) → dust on prisms/mirrors, engine contamination.
  • Fluctuating brightness → driver regulation drift or PSU ripple.

Thermal / Control

  • Light Source Error → module/driver fault, PSU instability, or protective trip.
  • Fan tach errors → worn fans, blocked ducts, sensor/connector faults.
  • Firmware faults → incomplete updates or region mismatch.

Step‑by‑Step Diagnostics

Restore Airflow & Baselines

  1. Inspect intakes/exhausts; clean without blowing debris into optics.
  2. Replace noisy or slow fans; confirm RPM against spec.
  3. Log temps at idle/load; check for thermal throttling patterns.

Driver & PSU Checks

  1. Measure rail ripple/regulation at the driver; compare to service limits.
  2. Check control lines and error pins; reseat connectors.
  3. Eliminate firmware faults: apply correct region image and verify integrity.

Optical Engine Hygiene

  1. Inspect for haze on mirrors/prisms; clean with approved methods only.
  2. Check colour uniformity patterns after service; document before/after.
  3. Verify full brightness under stable thermals; record fan RPMs.

Error Codes & Indicators

Indicator / MessageWhat It Usually MeansNext Step
Light Source Error Laser module/driver fault or PSU instability Run driver diagnostics; verify rails; confirm airflow and temps
Temp Warning / Thermal Derating Clogged intakes, failed fan, or sensor drift Restore airflow; replace fans/sensors; re‑paste interfaces
Firmware Update Failed Interrupted or mismatched image Reflash correct region; verify checksum; do not power‑cycle mid‑update
Wells Electronics • Technical Guide

LED & Portable BenQ Projector Repairs

This page focuses on LED and smart/Android TV BenQ models such as GV/GS portable ranges and performance units like X3000i, TH690ST, and TK700STi. It covers typical issues, practical troubleshooting, and error indicators.

Typical Issues

Electronics / I/O

  • HDMI handshake problems with AVRs/TVs → EDID/CEC conflicts or retimer faults.
  • USB/port wear → intermittent connections or device dropouts.
  • Audio board faults → no sound or distortion at volume.

LED / Firmware / Thermal

  • Gradual dimming or colour shift → LED ageing or driver derating.
  • Android TV/Wi‑Fi crashes → storage corruption or unstable builds.
  • Fan noise / throttling → dust, bearings, or tight enclosures.

Step‑by‑Step Guides

Stability & Firmware

  1. Back up settings; wipe caches; apply the correct regional firmware.
  2. Test apps and inputs after a clean boot; confirm no crash loops.
  3. Disable conflicting CEC/ARC features during diagnosis.

LED Driver & Thermal Checks

  1. Measure LED driver current stability; verify PSU regulation.
  2. Restore airflow; replace worn fans; check acoustic profile.
  3. Run a 30‑minute soak at native resolution; confirm no throttling.

I/O Integrity

  1. Inspect HDMI/USB connectors; reflow/replace as needed.
  2. Check ESD arrays and retimers; validate HDCP handshakes.
  3. Confirm ARC/eARC paths and audio performance under load.

Error Indicators

Indicator / MessageWhat It Usually MeansNext Step
Light Source Error LED driver fault or PSU instability Driver diagnostics; verify rails; confirm thermals
Temp Warning / Throttling Restricted airflow, failed fan, or enclosure heat soak Clean/replace fans; improve clearances; retest acoustics
Firmware Update Failed Interrupted update or mismatched image Reflash correct region; verify checksum; avoid power loss mid‑update
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  • Country: England
    Model: 2040 3D 3LCD Issue: Needs lamp replacement
    Date: 2021-06-29
  • Country: Scotland
    Model: GT1080 Issue: Looking to get HDMI SOCKET FIXED AS MEMBER STOOD ON CLABE AND ITS NOW LOOSE AND IS CUTTING ON AND OFF SOMETIMES SO NEED NEW HDMI SOCKET FIXED
    Date: 2021-06-27
  • Country: England
    Model: Hd33 Issue: Hi , I have a optoma hd33 , issue is its blowing the main fuse in the plug ( into the wall socket ), can only think its a power board issue ? its still a great picture but i know its ageing now , if it is the power board what would be a estimate to fix , or i just buy a another projector , i am down in london in approx 4 weeks so can maybe post down and pick up when i,m down which would be my preferred option and drive back i have the original box etc thanks howard
    Date: 2021-07-01
  • Country: Scotland
    Model: LC-XB43 Issue: Hi there
    Have an Eiki projector LC-XB43 (around 12yrs old) which fails to light the bulb despite changing to another bulb. Reading the forums makes me wonder if this is a ballast failure. Is this a device that you would consider assessing for repair?
    Alasdair Meek
    Date: 2021-07-07
  • Country: England
    Model: Halo Issue: A couple of cables got disconnected from the circuit board. No damage on the housing and the lens.
    Date: 2021-06-25
  • Country: England
    Model: W2000 Issue: Hi, I have BenQ W2000 projector which as visible dust particles in projected screen. I wish to clean it.
    Could you let me know what would be the price?
    Date: 2021-06-23
  • Country: England
    Model: SANYO multiverse projector model no. PLC-XU5 Issue: the projector lit up the needing new bulb, bought one and still doesn't work
    Date: 2021-06-22
  • Country: England
    Model: DLA-X55R Issue: Hi Folks,

    My Hone cinema projector won't power on, perhaps over heated, I'd like a quote for repair please.

    Many thanks
    Date: 2021-06-16
  • Country: Scotland
    Model: HD720X Issue: Hello, so I got this projector with an issue I think regarding the colour wheel. When I plugged it in, one of the lights on the top (don't remember which) was blinking red-- and then when I turned it on it made a rumbling, vibrating noise. It displayed image, but the noise was so violent I turned it off.

    I opened the projector in hopes of maybe clearing some dust (if it was dust in the fan causing the issue) but it seems I did something wrong in the process because now it doesn't have a light of any kind when I plug it in.
    Date: 2021-06-11
  • Country: Scotland
    Model: Ricoh 8mm projector Issue: I dont know whats wrong with it
    Date: 2021-06-30
  • Country: England
    Model: EH-TW6100W Model H502B Issue: With the original bulb in place unit will start up but then fail with red flashing lamp light after a few seconds of projecting an image other than the no source blue screen.
    With a replacement bulb inserted unit will not boot, Fan goes into overdrive and lamp never comes on
    Date: 2021-06-03
  • Country: England
    Model: PT-RZ470 Issue: Projector light (red) indicator is on and will not boot up
    Date: 2021-06-03
  • Country: England
    Model: plv z5 Issue: After between 10-60 minutes the light turns off. I can start again and the same will happen. The bulb has been replaced and it hasn't helped. Are you able to fix it please?
    Date: 2021-06-01
  • Country: England
    Model: h7550bd Issue: Hi, I am getting a fan fail error after the projector has been on for around 5 minutes. It doesn't seem that there is any excessive dust and there is only around 300 lamp hours on the projector from new.
    Date: 2021-06-05
  • Country: England
    Model: optoma hd141x full hd 3d 1080p projector Issue: I am after a proper service for the machine, suspect the bulb needs a refresh
    Date: 2021-05-28
  • Country: England
    Model: ARTLII PROJECTOR RD-630 Issue: Hey, the projector fan is broken and it will not take a charge to allow it to work off the charging cable. It is a fairly new projector and only been used a few times. Are you able to help?
    Date: 2021-05-28
  • Country: England
    Model: ARTLII PROJECTOR RD-630 Issue: Hey, the projector fan is broken and it will not take a charge to allow it to work off the charging cable. It is a fairly new projector and only been used a few times. Are you able to help?
    Date: 2021-05-28
  • Country: England
    Model: JMGO N7L Issue: Hi I have a JMGO N7L which has white spots on the projector image . Is this something that you can fix ?
    Date: 2021-05-10
  • Country: England
    Model: HD25E Issue: I need to replace the colour wheel.
    The colour wheel has already been cleaned by a professional but it still doesn’t work,
    Impossible to find the right colour wheel to replace.
    Date: 2021-05-11
  • Country: Scotland
    Model: EB U05 Issue: The projector will not power on
    Date: 2021-04-28
  • Country: England
    Model: Optoma uhd300x 4K uhd Issue: Unsure what the fault is. The lamp warning led has not lit up. The optoma logo appears & then it blacks out. The projector is in a fixed position, so hasn't been knocked or anything.
    Date: 2021-04-29
  • Country: England
    Model: VPL-CH350 Issue: Unit is failing to boot up. Remote control prompts the power light to turn from red to green, but after a few seconds it goes red again.
    Date: 2021-04-19
  • Country: England
    Model: EB-2055 Issue: Hi. I think the fan has gone in our projector. It’s has the temperature warning light flashing and is making a loud noise and the fan at the front isn’t seen spinning through the casing
    Date: 2021-04-12
  • Country: England
    Model: H375B Issue: When turning on I heard a large clicking noise and then when the projector is running there is a humming noise which I have never heard before
    Date: 2021-04-19
  • Country: Wales
    Model: Np15lp Issue: Hi i cleaned the lenses on my projector and now the colours are messed up was wondering if you could fix it plz
    Date: 2021-04-07
  • Country: England
    Model: Screenplay 5700 Issue: The [rojcetor powers up lamp fires up but looks like bits of a barcode on the screen and after a while it shuts down. Not been used for a number of years.

    Date: 2021-04-09
  • Country: Scotland
    Model: Yaber v2, dr q hi-04 Issue: 2 projectors wigh no response to power
    Date: 2021-03-29
  • Country: England
    Model: EB-485W Issue: Temp light flashing after 5-10mins
    power down and a reboot, runs again for 5-10mins
    Date: 2021-03-29
  • Country: England
    Model: PLV-Z700 Issue: Projector ceased operation. Has a new lamp. However the power connector appears to have been pushed back into the units housing. So, it won't connect with lead
    Date: 2021-03-30
  • Country: Scotland
    Model: H1P1406 Issue: The prjector has intermttanlty been showing a fan warning, and then working normally for several weeks. Today it styopped working at all.
    Date: 2021-03-25
  • Country: England
    Model: EH TW9300 Issue: My projector has lost some lumens output due to dust buildup inside. I have already changed the lamp however this made little difference. There are no obvious marks or dullness on the screen. I just need to improve the light output of the projector. If looking at the lens when on you can see the reflection of dust from the inside.
    Date: 2021-03-16
  • Country: England
    Model: w1200 Issue: RTRTRTRYR
    Date: 2021-03-24
  • Country: Scotland
    Model: W1070 Issue: The projector picture started to go green and very faint, I have replaced the lamp but still no improvement.
    Date: 2021-03-22
  • Country: Scotland
    Model: Pro 150s Issue: I could potentially drop the projector off at your premises in Glasgow. Give me a call, or a text, if that would suit you?
    Date: 2021-03-09
  • Country: England
    Model: Toumein v5 Issue: Hello,

    My toumei v5 projector is about 2-3 years old and was in really good condition (haven’t used it at all for a year). But now for some reason, the image is very blurred and I tried s lot of things (manufacture reset, power on/off, unplug/rest/restart, cleaning the lens gently, change settings, f’change focus settings etc) but nothing fixes it.

    Could you give me a approximate cost for this fix-up?
    Date: 2021-03-08
  • Country: Scotland
    Model: Epson Tw6000 Issue: Hi. Could you please give me a quote for my projector repair. Both of red light flashing. Its says internal problems. Thanks
    Date: 2021-02-24
  • Country: Scotland
    Model: Epson Tw6000 Issue: Hi. Could you please give me a quote for my projector repair. Both of red light flashing. Its says internal problems. Thanks
    Date: 2021-02-24
  • Country: England
    Model: ViewSonic PLED-W800 Issue: hi I have 1xViewSonic PLED-W800 tha needs the adapter hole fixed.

    one epson Epson EH-TW6100 - no menu showing just blu screen
    Date: 2021-02-16
  • Country: England
    Model: HC3800 HD DLP Issue: I have recently purchased this projector as second hand. I have had no problems with it so far, however I have now tried to turn it on without success. Now it will turn on for approx three seconds with the power/status LEDs as green. The projector then switches off with the power button flashing red and green, with the status button flashing red. Please can you advise if you will be able to solve this issue and kindly provide a quote.

    Thank you.
    Date: 2020-08-17
  • Country: England
    Model: w1070+ Issue: I seem to have dust spots on the back of the lense that need cleaning.
    Date: 2020-08-04


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