BenQ HT1085ST DLP Projector Overheat Repair

[@antmon123]

I've never paused and played a video so much in my life... :-) This was super helpful. I have the same exact projector and only have about 1800hrs over the 6yrs that I'll own it this Dec. Mine, out of the blue, just recently beeped and give me a heat lamp warning before turning off. I pulled it apart like you did and just dusted and cleaned it all up - there was some buildup but nothing crazy. I also just added a couple of external small pc fans to it - one at the front to exhaust and on on the left for intake. Hopefully that heating issue doesn't happen again! I think I'm OK, as for a test I ran it at full lamp strength (instead of the usual Eco) for 3hrs straight - no hiccups!

[@jpincebu4049]

"Life saver" thank you so much for this content. My BenQ had stopped working (just showing fault lights temp/lamp. After opening it up and following the same steps in your video, I discovered a small piece of broken plastic inside (as well as a fan that had been put back in "the wrong way up" I assume from a previous owner)... Anyway.... thanks to this tutorial I managed to clean the unit/fans etc. and is now working again. Saved me buying a new lamp (as that was not the problem). I assume one of the fans just wasn't functioning properly (blowing inward, instead of outward) as well as the loose piece of plastic inside rolling around and possibly getting caught up somewhere. The amount of dust build up was crazy. Mine is a 2013 model so older than this one and perhaps hadn't been cleaned before.... many thanks again 👍😎❤

[@FixitFrank]

I'm glad it was helpful! Thanks for letting me know. This is why I post these. Enjoy your projector!

[@eLLGrey]

I am very greatful for this video! I finally found last piece of broken lamp in my 1070 which completely as 1085!

[@FixitFrank]

That is fantastic to hear! I am very glad this was helpful. That is the goal of the video's. Enjoy the projector!

[@preethiniranjanidesilva8693]

Thanks for sharing this. I also have same problem and I fixed it by myself after seeing this video. Thank you very much ❤

[@chessguru900]

Well done. Very thorough and detailed repair as always.

[@caterina4364]

Hi! I recently replaced a broken chip in my projector (Acer X1320WH model) and I'm not sure about the placement of the big fan(s) next to the lamp (so not the small one that was cleaned in this video). Should they pull air away from the lamp and towards the outside, or towards the lamp and into the projector? Here it seems like the big fan is pointing towards the outside, given the arrow sticker we see on top of it. Is that true for my projector as well? Last time I turned it on, it smelled bad, like maybe it was overheating.....

[@FixitFrank]

yes the exhaust fan should point out. I think the only fan pointing in is the fan next to the DMD.

[@djken2003]

Hi Frank Great channel and video!! I a BenQ W1070 it keeps over heating runs for 10 mintues then shuts off. Any input would be great, Thanks

[@FixitFrank]

Hi Ken, I tend to see the exhaust fan wear out on those. The large fan you can see when you take the lamp out. The blades get blunted from heat and stop moving air as efficiently.

[@barbiecudich6284]

Hello Frank...me again... I get a New error now. FAN 4 SPEES ERROR...Wich one would that be? What shouls I do?

[@WS-hj8de]

This is awesome. Fantastic video. However mine is clean as a whistle, put it all back together but it still seems to be running hot. I dont know what to look at next. Any input would be appreciated! Thanks

[@FixitFrank]

is it throwing any errors? These do run hot. The exhaust air can be up to 75c. One thing to look at is the lamp housing. Some replacement lamps use the wrong IR cut filter and will dump heat inside. Make sure your lamp housing has a front glass that has a reddish/blueish/purpleish(depending on the angle you look) coating on the front. If its greenish or clear, thats a problem.

[@WS-hj8de]

@@FixitFrank yeah man no error code. Thermal protection not tripping. I think I was just paranoid. I googled this last night and I didnt realize how hot these units actually run! I think Im okay for now, but again appreciate the help, love your work!

[@FixitFrank]

Thanks! Nothing wrong with being extra careful. Fortunately that thermal breaker will trip if it hits 95c so you should be okay. I use my bedroom projector to help heat the room in the winter lol

[@TheaterAtReference]

good fix ..didn't know that DLP mirrors were subject to image burn in

[@FixitFrank]

Thanks! They can get a burn in and its annoying. My guess is the constant heat causes the mirror's structure to warp slightly. They sit in one position for so long under more heat than the other mirrors and then it will always kind of leave some sort of mark. I don't know that this is for sure the cause but it makes sense. Maybe someone else who works with DMD's specifically knows?

[@Kujokouklos]

A very interesting Fix Frank! Awesome as always!

[@algot34]

After I tried this to fix the overheating, the projector boots up, but the lamp doesn't turn on. After like 30 seconds the fans shut down (perhaps the whole projector shuts down (?), im not sure as i can't see anything on the screen). What to do? Should I replace the lamp or is the whole board toast due to perhaps static electricity? Edit: The riser pins that go through the metal structure and connect to the mainboard wasn't properly connected, now everything works. Thanks for the video.

[@FixitFrank]

I have done that so many times! Glad to hear its working!!

[@MuhammadYaseen-vx5hw]

Frank, i have got HP vp6120 now, within very bad and dead condition, some parts are missing in there, like lamp, button panel, front and back body plastic ventilating grills and full of dust. I know about its condition but my interest impressed me to purchase it against 500 pkr.

[@FixitFrank]

Do you think it will clean up well?

[@MuhammadYaseen-vx5hw]

@@FixitFrank yes.....

[@FixitFrank]

For that price you can't go wrong. That is an older but very nice projector. I bet you of all people can get it running.

[@MuhammadYaseen-vx5hw]

@@FixitFrank but, its some parts are missing. it is so big hindrance. available serving peoples say for their service bill (ok or not ok the work) which is not in my favor. therefore, i continue my own struggle.

[@RomiPetrut]

Hi, congratulations for your detailed video.I have a Benq w1200 projector with a new bulb but the same problem.After 10-20 seconds starts clipping red and enter in protection mode.All is clean, no dust, the fan works well.Maybe you can help me to solve it. Kind regards, Romeo

[@FixitFrank]

Make sure the new lamp has the proper UV IR filter. Many cheap lamps(especially trash from amazon) uses the wrong IR coating and causes te color wheel to flicker and then shut down. Make sure the glass on the lamp has a reddish /blue tint to it.

[@RomiPetrut]

Thank you

[@paulponce7089]

Hello again frank. Latest update of my w1080st pls. referred from previous comments. 5 fans (whole set) I have ordered from China arrived yesterday. I’ve replaced the faulty cooling fan next to the speaker that blows and cool the heatsink behind optic assembly. Now, there’s no more TEMP indicator light that comes on then, shut down after the projector fired up for 5 minutes . I took your advice..thanks

[@FixitFrank]

Awesome! Glad to hear it Paul. Enjoy the projector. It should be fine for some years now.

[@valentisivanovich9831]

As always, a very interesting video! Thanks Frank !!! 👍

[@FixitFrank]

Thank you so much Ivan! I appreciate you watching

[@littlegeniusplayschool459]

Hi, please make a video on colour wheel .I have swapped pmd1000 ic but the problem still persists. Even new colour wheel doesn't turn on the projector.thanks and regards.

[@FixitFrank]

Is the power supply running okay? It might also be the DLP controller (DLP4420? I forget the actual chip #).

[@littlegeniusplayschool459]

@@FixitFrank yes sir, upon swapping entire mother board projector comes alive.thanks

[@KlempirinaCz]

the projector warmed up after cleaning in the service and it always turned off after 7 minutes the lamp cooled down and then the projector turned on and the red lamp lit. The lamp is lit 1450h. and the fans spun at 4500RPM. It wasn't clear to me, but when I drove the machine to a cleaning service, everything was fine. After weeks of reading the forum, I got angry and opened my projector and found a flaw in the front fan being turned, which was blowing inwards. I turned it so that the arrow of the fan pointed out and assembled the device. The projector is working, not humming and is well ventilated and the speed is 1900-2100 RPM. service might know this but don't you think? I'm a layman, but I don't hesitate to start everything, and if I knew I wouldn't go into that projector, I still had to. nice day Honza

[@FixitFrank]

This makes me really happy to read. Great job! As you saw, it is not hard to mix that fan up(as you saw in my other video) but I found it by testing! It seems they did not test it long enough( or at all). Thanks for letting me know and great job on repairing it yourself!

[@KlempirinaCz]

is good shared information. Someone just reads like me but then solves the problem and I'm happy to share. It was bullshit, but someone can change the position of the fan when splitting and cleaning, and it's really easy. Fan 1 must always blow outwards. Good luck and still make contributions. My English is from google and therefore I'm sorry otherwise watch the mohe site what I'm dealing with. I'll be happy

[@wd7099]

Hello Frank, Excellent video! I have the exact same model. The lamp blew and shattered and after I replaced the lamp, I experience the exact same issues (it would run for about 3 minutes and then shut down from over heating). Turns out there was glass trapped in the same fan as in this video. I followed the steps exactly, including cleaning out all the dust from the unit but now when I plug the power in, it does not power up (nothing engages). I only get the green light on the start button and the red light on the power button. I verified that all the connectors were plugged in correctly on the power board and the on main board. Please Help. Thanks in advance.

[@FixitFrank]

Double check the alignment between the low voltage power supply pins and the mainboard. That is the exact symptom of it being offset by one position. I'm referring the riser pins that go through the metal structure and let the mainbaord plug into it. It's super easy to offset that connection. Guess how I know? :)

[@wd7099]

@@FixitFrank Thanks Frank. I check several times and all the pins are aligned. I brought an replacement power supply board off ebay and nothing, same problem. Either that board is bad as well or something else. I can't think of what else to try. Don't want to spend to buy a new projector unless it is absolutely necessary.

[@bradcas86]

Mine is all of a sudden running hot and shutting down. Took it apart and cleaned the fan. My question is, when testing can I keep the lamp out and when I turn it on will that fan come on? Doesn't seem to be. May need to replace.

[@FixitFrank]

which fan did you clean? there are 4. If your old lamp burst, then the issue is probably in the blower fan. I recall that the exhaust fan should come on(the larger fan) once the lamp reaches temperature(after a few min). If you can get it to run for a few minutes, then you can check the service menu and see what fan is throwing the error. It could be the DMD fan, power supply fan, lamp blower fan or exhaust fan.

[@lawriey]

Hi, I have a BenQ W1400. The projector switches off after about 15 seconds, with the power light on red and the Temp light on green. Please do you have any advise on how I can resolve the issue ?

[@FixitFrank]

Hi! It kind of sounds like a jammed or bad fan. If you had a bulb explode recently, then the blower fan in the middle would be suspect. I have not worked on a W1400 before but I suspect it has 3-4 fans inside. If you physically see all the fans spinning, then the hall effect sensor inside one of them went bad. But if you had a bulb burst recently, then check inside the fan nearest the bulb and see if you can spin it by hand(might need to use something small to push it). I bet its jammed and then a piece of glass falls out. Either way, the issue is almost certainly a fan problem.

[@lawriey]

Hi Frank. Thank you for the quick response and for your advice. I’ve only just bought the projector secondhand. Your videos are very helpful, so, I will have a go at opening up the projector and will attempt to clean up the fan. Thanks again!

[@JasonPutnik]

Frank, I've owned this exact model for 5 years and had the 1st lamp explode at 3 years, replaced it and it's been working great for 2 years. Last week I got a flickering picture, now I have no picture and it turns off within a minute of hitting the power button. Solid Green Power, Solid Red Lamp light. Bought a new bulb, no change. Is this a Color Wheel issue? What should I troubleshoot next?

[@FixitFrank]

Hi Jason, I just replied to your email

[@simon-ro5vy]

My benq shut down after 30 sec. After that ot is no led blinking .. some ideas what could be the probem?

[@FixitFrank]

I always question the lamp first. they are the easiest to replace and you can return them. then the color wheel is a close second. After that it might be a bunch of things. I'd suggest starting with a new proper lamp(not from amazon) and see what happens. Or it might be a thermal issue from a cheap lamp or clogged fan. If the case is really hot when it shuts down, the thermal breaker is popping. a good cleaning might solve it.

[@fabricegrenier-arellano4531]

I have a BENQ W1080st, the lam works for a couple minutes playing movies and such then the image distorts the colors and subsequently shuts off. Do you think its overheating like this one and it might just be a lam problem or something else? Thanks in advance.

[@FixitFrank]

Hello! That sounds like a color wheel to me. The flickering of colors is very common when the color wheel is worn out. The lamp only generates light, and the colors or picture stuff are all after that. I have some videos on color wheel for other models, but the steps are the same for your 1080, check my color wheel videos for ht1075 or w1070. same steps.

[@fernandocumbe1954]

I have this protector and want to service it myself but I don’t want to get dust on the sensor. How do I do that? Also after the second lamp blew up there a high pitch sound. What do you think is the cause and how to fix it?

[@FixitFrank]

To clean the projector, watch and a follow along with other videos. There are quite a few on this model, the w1070, w1080. They all follow the same general steps. Take your time, take lots of pictures of what is plugged in where, before you unplug it. Slower is better. Less chance for errors. Never force anything. If it's not moving or seems too tight, make sure you didn't miss a screw or clip. Use the right tools. The noise could be a bunch of things. If the second lamp exploded, it might have damaged the color wheel and the blower fan. I'd look around really well inside where the lamp goes. If you see bits of thin colored glass, you might have a damaged color wheel. The fan that I cleaned in this video made a lamp explode too. That is the fan that I think is bad in your projector. If you lost the lamp, color wheel, and the fan, that is going to be more expensive and a lot more work than a cleaning. It's not impossible but like I said above go very slow and document your work so you can make sure you know parts fit together.

[@victorshm8906]

hi frank, my projector lamp has exploded. (I have a Benq 1070). I bought a new lamp and did all the steps you describe in your video, and a piece of glass was stuck in the central fan, like you. So I cleaned the whole interior and put it together again. but after 10 minutes, the video projector switches off by itself and the "lamp" icon flashes red. i noticed that the right rear fan does not turn on, maybe the problem is there? thanks a lot for your answer 🙏

[@FixitFrank]

I would check the service menu first(also make sure that fan is tightly plugged in). Press the menu button, then press enter/source buttons at the same time. You should see some boxes on the top of the screen with a number 1 in the first one. Use the arrow/enter keys to move around the boxes (I think its box 3 or 4) and find the error screen. It will show you why it shut down(fan error or temp error or lamp error). That will tell you where the issue is. The fan you see not spinning does not start right away but it should have started within that 10min. It might be bad. I have had to change those in the HT1075. The w1070/w1080, ht1085/ht1075 all share the same chassis with slight variations. The troubleshooting steps apply to all the models. I have a few vids on the HT1075 that might be helpful

[@victorshm8906]

@@FixitFrank thank you very much for your reply, i will watch your other videos, you rock ! I looked at the technical menu and saw that I had a speed error on fan 1. Is this the one in the corner not far from the lamp?

[@victorshm8906]

in fact, it's fan 3 that doesn't work!

[@FixitFrank]

Fan 3 is the blower fan that you took the glass out of. I wonder if there is more glass inside? Here is the diagram imgur.com/a/nyIzDBU The other possibility is that the fan spins but the status wire is not working and the sensor in the fan is bad.

[@victorshm8906]

@@FixitFrank yes i’m pretty sure that’s the problem. The last question, do u know where i can buy a good version of this fan 3 on internet ? Thanks for all.

[@numusique]

Hi I have a Benq TH-534 with a noisy fan. I don’t really hear any difference when I switch the fan mode from normal to high. Seems very clean inside when Im lifting up the bulb. Fan doesn’t look bad at all. Is there maybe any components that can overheat like for example the DLP processor? Maybe put som dots Thermal paste same as like when you’re trying to cool down a cpu inside a laptop?

[@FixitFrank]

You may be hearing the color wheel going bad. Be sure to check all the fans. There are three or four of I recall correctly. One is in the middle under the main board. It is next to the color wheel so the color wheel may sound like it's a fan and throw you off. There is some heat paste between the DMD and heatsink but I would not replace the paste until you find the sound origin.

[@zangbal]

My thing isn't turning on after I disassembled, re-assembled, and then re-attached to the ceiling, which means I have to do the whole process again this afternoon haha!

[@Kujokouklos]

Frank, a quick question for you. From your experience, if a fan in a projector needs replacing, is it a good idea to replace all fans at the same time with new ones? I really open my projectors every 700 hours and clean them as thorough as possible. But what happens when it is time for a fan to say good bye? Do we sent all the family at once to paradise? :) :)

[@FixitFrank]

I don't think you need to replace all of them. Only the fans that feed or take air from the lamp are really going to feel the abuse of the heat. The power supply or DMD fan will not have the same thermal load. As long as they stay clean, the other fans should last quite a while. It comes down to how much you want to spend in my opinion. If the cost is not prohibitive to buy all new fans, then it can't hurt. Many service manuals even say you're supposed to change the fans every 5000 hours which is silly in my opinion.

[@Kujokouklos]

@@FixitFrank Thank you my friend! 5000 hours is a bit too early to replace spinning blade fans IMHO. I have fans in pcs (cheap 2 dollar fans) that still work after a decade (OK I lubricate them but nevertheless) and I found out that my BENQ TW533's fans are server quality level fans. But this is not a server or pc it is a pj and you are the pro in these! So, your opinion counts as 100 times more! Thanks again for all the info you provide, never can have too many repair videos!

[@paulponce7089]

Hi frank. I have a Benq w1080st which I bought 5 yrs ago. Since I bought it, It hasn’t been used so much, only using it when there are good movies on iTunes. The bulb has 56 hrs of used. When not in use, I put it the coffee table drawer neatly with microfibre towel on top of it, so dust free.. When viewing I will take it out of the drawer and sit it on coffee table. Last night, I turned it on and watched a movie, and that was fine. Then, soon afterward, it shut itself off,overheated. Power light flushing red and Temp. was green.. what causes it? Would that be cooling fan?

[@FixitFrank]

Cooling fans would be my first suspicion. The W1080 is almost identical to this one inside. The large fan that acts as exhaust would be something I would check as well as the blower fan that I showed in this video.

[@paulponce7089]

Frank just an update. I found the culprit, is the fan close to the speaker, it doesn’t spin. I took out without taking the pcb. I disassembled the fan by popping the fan blade. The coil and the magnet In around the fan, it seems to be okay. What is the supply voltage of that fan? I have multimeter to test from negative chassis to supply voltage.

[@paulponce7089]

Another add up to update. I took took out the printed circuit board out to gain access to the blower fan next to the power supply. To test that fan, I improvised to stuck a cello tape halfway on the duct opening (running it without the lamp assembly) the blower fan blows the cello tape and it makes the tape slapping around the duct hole. That seems to be okay. The power supply cooling fan running good. The color wheel spinning good. The fan next to the speaker not spinning, and I think this causes the green light TEMP in just one minute. BTW, Frank mssg me the voltage reading of that particular fan. Thanks a lot.

[@FixitFrank]

@@paulponce7089 Hi Paul. I need to look up the supply voltage to be exact but I would expect 8-11 volts on average. See if the tachometer lead is acting the same as the other fans. Sometimes the RPM sensor in the fan pcb goes bad.

[@paulponce7089]

@@FixitFrank hello, frank... thanks for your reply. I’ve decided to ordered all 4 fans for AUD $44.00 on Ebay that come from China. If one particular fan would cost $30.00 alone. I don’t know how long it will take to arrive in Down under specially this festive season.... I’ll keep you posted... cheers.

[@seriousstuff8887]

Hey frank .. I have a yaber y21 Projector that runs for a short time then goes to a static green screen . It has to be turned off at the back to reboot it . Any assistance would be appreciated thanks .

[@FixitFrank]

I hate to be that guy but there is not much you can do. These yabers and their comrades(emotn, apeman, vankyo) are really built cheep and do not use good parts. The cost and time to repair one will go far past the value. They all break really easily and most only last a year, maybe two if its not used much. I'd seriously suggest a used name brand projector as a replacement. It'll serve you far longer. I'm sorry I don't have better news.

[@seriousstuff8887]

@@FixitFrank thanks for replying, i took it back to the shop and got refunded . It was shorting out after you could hear what sounded like an electrical charge inside the unit . I bought it second hand and explained the issue to the store manager . But yesterday i popped back to the store to look for some ps4 games and it was put back on the shelf for sale .._ lol madness

[@FixitFrank]

@@seriousstuff8887 holy cow! They are selling it again! Insanity...You dodged a bullet.

[@surajnarkar.7071]

Hi Can we operate led projector on 110v If operating voltage is 240v?

[@FixitFrank]

I would check the manual. Many modern projectors are multi-voltage and will work from 90-250v 50/60hz. I would need to know the model number and brand before I can say yes or no.

[@underminerable]

Hello frank, based on the video. Does the bulb need immediate replacement or can use until it die?

[@FixitFrank]

It is better to replace the bulb before it dies. That prevents the chance of the bulb exploding and damaging the internal parts. Also, if you replace it while the old bulb still works, you have an emergency backup lamp for the future.

[@underminerable]

@@FixitFrank alright tqvm frank

[@Mr360ryan]

I have a question. I just recently bought this projector. I tested it. And it get hot quickly as well. The image is not so bright. Could my bulb be going bad?

[@FixitFrank]

It could be. I would make sure it is clean and moving enough air before replacing the lamp. But I would definitely replace the lamp if it seems dim. Just be sure to not buy the lamp on amazon or use a cheap company. I see too many problems that end up being caused by sub par lamps. The HT1085ST is a great projector! You will love it.

[@whitestreamz]

Its so hard to know where to buy a spare lamp. Cannot find a legitimate one from benq in uk. Been looking online but reviews of the companies leave me worried. I had trouble before with the lamp housing not fitting my w1080st+ and i have no idea why. Maybe its the inside of projector built wrong or maybe bulb housing was. But they dont aling on the metal screw in above colour wheel. My current lamp housing sais 3D. (Something) ST not 5j which left me confused.

[@michaelphiri4923]

thank you so much sir

[@eduardoalviggio5436]

hello I have a Benq 6110 that suddenly no longer works when I turn it on the light starts the fans start but after a few seconds it turns off as if it were driving protection the lamp is still good with 700 hours available what could have happened? Thank you Could there be condensation? since I don't always use the projector it has been stopped for 4 months

[@FixitFrank]

Hello Edoardo, What LED's do you see after it goes into error?

[@FixitFrank]

Another thought. You may want to try reseating the lamp just to be safe.

[@eduardoalviggio5436]

@@FixitFrank the orange LED flashes

[@averagestudent4358]

Would you recommend buying an old BenQ dlp or Epson 3 LCD projector?

[@FixitFrank]

BenQ dlp sure. Epson never. Used Epsons are unreliable and tend to fail without being repairable. Dlp in general is way easier to keep running long term. The optics in Epsons degrade no matter what you do and can't be replaced within reason.

[@averagestudent4358]

@@FixitFrank How about those low lumen cheap led lcd ones? Looks like they would last long and requires only less maintenance. Also less power consumption too. 🤔

[@FixitFrank]

They are pure and utter garbage. They usually fail within a year and they are fixed focus. The corners are always out of fucus, the color is always bad and the OS they use is awful. I personally think they shouldn't exist. I think they are a scourge on the market. You might get 250 lumens out of a higher quality model. They claim ridiculous specs. There is a reason they are $100 on amazon.

[@averagestudent4358]

@@FixitFrank totally makes sense my friend. 💯 I think I should buy a used 3 LCD or dlp projector. I have found a few used ones with AV input only , still no problem I can use HDMI to AV converter 😄

[@FixitFrank]

If you go LCD then look at NEC or Panasonic. Epson is bad used. For dlp, Optoma BenQ and ViewSonic. Mitsubishi is good for either LCD or dlp

[@jermaineberenyi2440]

Hey Frank! my question is does that fix the problem? My projector shuts down after 20 second when switching it on and give the temp sign . Would really appreciate if you u would reply and help me👍

[@FixitFrank]

It sure could be. I suspect you have a fan not turning at all if its shutting off that quickly. I posted a video about an HT1075 recently that had a similar failure to yours. Any HT1075, W1070 video will also apply to the HT1085ST. You have 3 or 4 fans in there and any one of them might be the problem. You can turn it on and look into the sides to see if the axial fans are spinning. The lamp blower fan is harder to see.

[@jermaineberenyi2440]

@@FixitFrankthank you so much..!👍👍

[@ivanantuna8265]

Where can I contact you i got same problem my benQ get overheated sons i put the new lamp put back together and gets overheated problem

[@FixitFrank]

There is an email on my about page. That would probably be best.

[@ivanantuna8265]

Tankyou so much for your video I follow every single step and now i fix my proyector It works But if something else happens i well contact you again THANK YOU SO MUCH

[@oskargert3632]

Hi Frank, first of all great videos. It is really helpful to have someone show you step by step how to repair and clean electronics. I have purchased a Benq th670s, used, which had an issue with a flickering screen. I have seen your video "BenQ HT1075 DLP Video Projector Repair - Flickering Picture" and suspect that this is the problem. To verify I measured the voltage over the lamp, which was 135V. I know that in your video you said that bulb should get ~300V, I have not been able to find any information for what voltage the lamp in the th670s should have. Do you know what voltage it should get? if it's supposed to get 300v then it is likely that it is the same problem? Best regards Oskar

[@FixitFrank]

Hi Oskar, the 380V should be DC and measured at the input to the ballast. Measuring the actual lamp voltage is kind of difficult. It is high frequency AC so a normal meter will not read it properly. However I personally suspect you have a color wheel problem rather than a lamp driver/ballast problem. Let me ask. When the image flickers, was it light to dark or sort of like colors shifting or changing erratically?

[@oskargert3632]

@@FixitFrank I would say it looks like a light to dark flicker. The color is kept pretty consistent, just gets dimmer. And its not really erratically, cause it happens in the same spots. You can see a video of it here: filebin.net/11xwakc0pguswh7w

[@FixitFrank]

That might be a color wheel, but it more looks like Arc wander. Do you run in Eco mode a lot with that lamp? If so, put it into standard mode to clean the arc points. I don't think your ballast is the issue at all. The flickering would be substantial and the image would be more dim across the screen. If you use eco mostly, there is a chance the lamp might be bad. If you use eco too long it leaves scale on the tungsten electrodes causing arc wander and eventually the inability to strike an arc.

[@oskargert3632]

@@FixitFrank I just bought it a couple of days ago, but the previous owner claims that he has used eco mode a lot. So that might very well be the case. I guess I can buy a new lamp to see if it solves the issue. I’m just worried that the previous owner already tried this. Because there are signs that someone opened the lamp hatch and the lamp timer has been reset. The previous owner though, clams that he hasn’t ever changed the lamp and that he’s had it since it was new...

[@oskargert3632]

Just letting everyone know, Frank was right. running the lamp in normal mode and turning up the brightness to max has solved my problem. I have no more flickering and am super happy. Thank you @FixitFrank for your awesome help!

[@eduardoalviggio5436]

a paintbrush and some isopropyl alcohol would be ideal

[@mahindaelectronicandtrical9610]

Thank you

[@apssap2565]

Y not clinging blower fan with soap water and toothbrush ,its totally need clinging

[@FixitFrank]

I went back and cleaned it with alcohol. I wanted to make sure the whole unit was worth putting the rest of the effort into. I did not record that part.

[@waynerobinson3473]

Can anyone tell me the name of the part that the lamp connects to the bay where the door switch is mounted

[@FixitFrank]

Do you mean the black plastic part?

[@baburamanathan476]

How to remove black dots by fungal in the lense.and how to change lamp?

[@FixitFrank]

The lamp instructions are in the manual, near the end. I am not sure about the mold cleaning though. I have never dealt with that.

[@lincolncolt3183]

AWESOME THANK YOU!

[@FixitFrank]

You're welcome!

[@barbiecudich6284]

Hello Frank! im Barbie from argentina! I have 2 Benq ht1085st, I owned one for a long time and its working perfectly just asking for a Bulb change... then I got another one on eBay " sold as new" and after a few uses the projector started to heat up and shut down... I followed your video open it and the lamp was SOOOO HOT! VERY VERY HOT I could not even touch it with my hands. I did not know if the problem was the lamp or the fans so I tried changing the lamps between projectors and I ended ups with this situation : New lamp on older projector heats up and shuts down, old lamp on new projector also heats up and shuts down... old lamp on old projects works fine. I HAVE NO IDEA where the problem is... bad lamp and some other issue on the new projector? H E L P !! thanks !!

[@FixitFrank]

Hi! Might be a little of both. However I would definitely check the lamp blower fan that feeds air into the lamp assembly. I have a video on an HT1075 that overheats that also had a bad exhaust fan. The lamp assemblies will get too hot to touch. That is normal. The exhaust air temp should be 60-70c(roughly) so it will be quite warm but it should not shut down. kzbin.info/www/bejne/qYe1k3-PaL9pf68

[@barbiecudich6284]

I did all you explained on the video...cleaned...but Stiller overheating and power off...what el se can I do?

[@adeeep]

my dell projector is acting different when i switch it on it go on high fan speed although it was on echo mood ,,,, does any of you know why

[@FixitFrank]

Hello, What is the model #?

[@adeeep]

@@FixitFrankdell s560t

[@adeeep]

Thanks for your interest ... If I left it for like a day and come back it goes back to normal .. I think there is some thing wrong with sensor ..that I couldn't find

[@FixitFrank]

I did some reading and that may be due to ambient air temperature. If the room it is used in, is over 20-25c it may activate the fan into highspeed even in eco mode. The lamp still generates a lot of heat in eco. This seems to be normal operation for the projector. Being that its intended use is for classrooms and conference rooms, they must have designed it for better cooling instead of better noise control. The only thing I can think of to look for is dust build up near the fan blades. If dust builds up on the fans the shape of the fan is no longer efficient. This leads to cooling problems. I think you have no sensor problem, but please check for dust build up. That would cause extra highspeed fan operation.

[@adeeep]

@@FixitFrank thanks will do ... 👍

[@preditor888]

Well done again Frank your a Gem.

[@csrienivas1185]

mi youth projector overheat how to repair, how to resolve fan and temperature sensor error

[@FixitFrank]

I'm sorry I am not very familiar with those. The parts are impossible to find and they are so cheap to replace that I never get them in for repair. However I would check the fans since it seems like one is not working. The fan should have a sticker with its part #. you can find it that way.

[@andrewpopoff3453]

If your DLP ever dies I could use a main board for this projector

[@FixitFrank]

That was a repair. It's not mine.

[@barbiecudich6284]

HOLA Frank! Again from Argentina .. I have a Benq 1085st and had the lamp button red and after one hour of movie would totally power off. Took it to a service place here in argentina where usually People are not honest and they said problem is : repair fan and temperature curcuit....and price is around usd200 to fix. I know how to open and how to change a lamp and usually i can fix some things...i cannot change chips and so.. mbut...i think im Being scammed. Can buy a spare part order online and fix it myself? Help me 😉😘

[@FixitFrank]

I think you can fix it. I don't think you need to change any chips. If it runs for one hour or so, that means you can check the service menu for fan errors. I suspect you only have a bad fan and no repair to the "temperature circuit" is needed. I think they made up "temperature circuit". I never heard of that. My guess is your exhaust fan or lamp blower fan is bad. Turn on the projector. Then press menu button so menu appears. Then press Source and Enter button (on the projector) at the same time. Some boxes will appear on the screen. Use the arrow buttons to go to box 4 and then press down and you will see the errors. Usually it will say "Fan x error: " and then the amount of fan failures recorded. X is the fan number. There are four. Usually the exhaust fan is the fan that goes bad but it can be any of them. They just plug in so no soldering is needed. If you have access to eBay or AliExpress you can source the fans or I have a contact in china I can share. Let me know what you find in the error log.

[@barbiecudich6284]

@@FixitFrank Frank,! I will check all you say. Tomorrow ill pico up from the service store. Once I get the error code i will look for you and let me know what to look for China is for me You are the best Xxx Barbie.

[@FixitFrank]

Sounds good to me! I suspect you have a good handle on the mechanics of things so I'll be around when you need to know the electronics side. Cheers!

[@barbiecudich6284]

@@FixitFrank Hola Frank! I did what you said and I can see this: Fan 1 error 16 Abnormal power down What should I do?

[@barbiecudich6284]

@@FixitFrank i need a code to find the fan 1x for ht1085st model...right? I can see on ebay one for w1070... but cannot find any informatión for the number model for mine...

[@Adamadam-bz6nz]

👍

[@FixitFrank]

Thanks buddy!

[@gamotech2557]

lol

[@FixitFrank]

Thanks for watching!

[@mahindaelectronicandtrical9610]

Thank you