BenQ MP622 DLP Projector Optical Block Cleaning
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- เผยแพร่เมื่อ 22 พ.ย. 2020
- This is about cleaning the DMD area inside a BenQ MP622 that I previously worked on. After shipping it back, some dust was loosened and got onto the DMD. After cleaning the projector ran great and the end user was very happy.
Please know this video is missing the final portion where I re-assemble and test. I am going to upload more partial videos as they do show useful info, just not the entire process.
Here is the previous video. • BenQ MP622 DLP Project...
If you need a lamp, here you go. www.purelandsupply.com/benq-l...
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Great to see ya back! And thanks again for getting my PJ up again, too!
Frank as excellent as always! Thanks for sharing!
Thanks so much! Hopefully my partial videos are still as useful. I figure they should be.
Hi, im from Argentina, i bought a Benq TK 800m a year ago, and honestly it's amazing, movie like experience in your home! But i recently noticed that it has 3 dust motes on the screen when the image that its showing is completely black or close to it, so i probably have to open it up and clean it. I can't find a video of that specific model disassembly but this one helps me a lot because they are of the same brand and very similar, so thank you for this video, it will help me a lot!!! I hope i can fix it without destroying it hahahaha!
did you fix it?
I always enjoy watching your video! Good luck Frank!
Валентин Спасибо, Спасибо за просмотр! I hope my Russian is OK. I am trying to learn so I can read more about non-western history and technology. Happy Holidays to you and thank you for subscribing and the kind words.
I am a big fan of projectors, thanks to you I learn a lot about this. Thanks for your videos! Congratulations to you and your family on the upcoming holiday !!!С русским у Вас все ОК.
Great video, Frank! Would you maybe consider making a video on how to clean the optical unit on a BenQ W1070? Or is the process pretty much the same as in this video?
I am having some small spots on the screen that are visible when some colours or backgrounds are shown.
You are the best and thank you for what you do!
Its basically the same as this. But there will be a specific 1070 video eventually.
@@FixitFrank Thanks a lot for your reply Frank! I actually fixed it myself with a little bit of help from another video I found and the difference is enormous!
Hey Frank, Top man. I always give thumbs up on all your videos. I was impatiently waiting for this video. so, the dust is gathered on the actual DMD then? It never occured to me to clean the chip. Wow!!
Thanks man! I think so. It seems like it was in one of the crevices where the bottom attaches. The way the dust bits were solid kind of pointed to them being compacted at some point. It could have been in a few places though. There are a decent amount of nooks and crannies to hide in.
@@FixitFrank Frank are there any forums that you can recommend only for projectors if I encounter complicated problems I can ask someone there? I am in UK.
Thanks again for the reply.
Thats tough. r/projectors is good but I think the one at hometheater forum or even eevblog might be better. I tried reddit but its reddit... No one ever searched the subs. They just posted the same questions that had been answered 100x and most of them were "I bought a cheap junk projector on amazon for $80 and its not working, wat do?".
Feel free to email me. The address is in the about page. I do have a day job but I try to respond a few times a week.
@@FixitFrank Hi Frank this email of yours doesn't seem to work Fixfranksales@weezytech.com
Its just sales@ No fixitfrank at the beginning.
Thanks for posting this Frank! If dust is in the optical block, does it typically show up as a small spot on the screen? I just bought a used BenQ HT2050a and there were two very large fuzzy-looking spots (I'm guessing dust bunnies), each taking up probably ~5% of the screen. I tried replacing the old lamp and no change. I ran the projector on high altitude mode thanks to a tip I found online and that got rid of one of the two spots (I actually saw it get pushed off the screen), but the other one has remained in place. I'm hoping to avoid getting into the optical block, so am wondering if a much larger spot means that the dust is located in some other area of the projector and can be removed with a different method. Any thoughts?
It's probably inside if its visible in the picture. If the dust is before the DMD in the optical path, it tends to be washed out by the light. If its on the DMD or in front, it shows up like that. See if you can focus in on the dust blob. If you can sharpen the shadow, its in front for sure. I'm actually working on an 2150 right now with a dust blob issue(same chassis). I should have that video up this weekend. sit tight and I will see if I can show you any tricks that minimize disassembly.
@@FixitFrank Thanks for the response! Will keep an eye out for the new video.
editing now. It will be up later today/tonight. I recorded a part just for your situation.
th-cam.com/video/SIhOAUVlRd4/w-d-xo.html
Hi Sir Frank, thanks for this video. How about a dimmed display?
My first thing would be replace the lamp. Without a known good bulb/lamp it could be a bunch of things. Usually its a worn out and failing bulb.
Hello Frank, I have a BenQ W1070 that started to have the image stop working after 5 - 30 minutes (gray screen, buttons not responsive as far as I could tell. Lamp, sound and fans still running- projector seemed to think all was well) It then progressed to only lasting a few seconds to then only having the power light on solid red and a noticeable squeal now coming from the unit (I suspect from the power supply). I seem to be getting the expected standby voltages, 3.22V and 14.8V. In this video at 7:30 you mention the PWD1000 as a possible cause, do you happen to have a video on troubleshooting this? I have also been unable to find a data sheet for this chip, if possible could you post a link for this. Thanks for your videos and help
Honestly that sounds like a color wheel issue. The squealing and the grey screen are symptomatic of that. The voltages look ok to me.
I found the service manual for the w1070 on elektrotanya.com and it has the pmd1000 circuit but I don't think it's a power problem from your description. At least not yet. I'd focus on the color wheel and color wheel sensor. I'd recommend downloading the service manual and check the color wheel first.
@@FixitFrank Thanks so much for your input. I will have a look. Cheers again.
Hey, thanks for the video, it is very clear. I don't have Kimwipes at home and I live in France, what should I clean up with instead?
Eyeglass cleaning cloths or cleaning paper(dry kind) would also work. Any sort of photography supplies for lens cleaning are more than perfect for it.
@@FixitFrank are Qtips a no ?
@@sim_lmbr they are fine. The main thing to remember is you don't want to scratch or add dirt to the lenses. As long as you consider that you will be fine. I have gotten away with using clean toilet paper before.
@@FixitFrank all right I'll be careful. Thank you very much !
How can I remove dust from canon dlp projector ..??
hi frank, is it not necessary to clean color-wheel ? as i observed in this video.
Only if the color wheel is very dirty. I had cleaned it previously with air so it did not need more cleaning.
convinced.
a dirty colour wheel will not have a persistent spot as it never stops moving during the operation of the projector
@@sausagedog52 he's not asking about it because of the spots. He's asking if it needs cleaning in general which it did. Dust causes all sorts of issues beyond visual problems.
Hey Frank, I have suddenly noticed specks of dust. Could this be because it stood on a dusty table? And how do I do this in my BenQ TH681?
I'd have to see a picture to be sure. It could be dust or a bad DMD depending on the spot shapes. Can you focus onto the spots at the same time as the picture or is the picture focused and you see blobs with halo's? Dust spots will be out of focus when the image is focused and vice versa. If you see clear spots with the picture then the DMD might be bad.
@@FixitFrank the specks can be focused on. If I have a clear picture they look like slightly brighter spots. My girlfriend doesn’t notice them but to me they ruin dark scenes. If I adjust the lens I can focus on the spots.
@@FixitFrank oh and if I take it apart another video from a german guy recommended using an air duster can to clean the dmd chip by simply removing the lens and not the entire optical unit. Is this also a possible solution?
@@FixitFrank I think I ruined my projector. I couldn’t reach the chip like in your video but only by removing the lens in front of the whole assembly. Then I wiped it down with a cotton swab and window cleaner (a repair guy told me to do this) and now it has even more dust and as a bonus some nice smudges. However I think there’s a glass in front of the chip which is what I cleaned
Dont use window cleaner on a projector. The lens coating will be stripped. dionized or distilled water is okay but no solvents. your DMD is likely what is dusty.
Hwo do I remove the lcd assembly from an NEC M260W?
Its kind of involved. You need to take the screws out near the lens that hold the prism and LCDs in place. I have an old panasonic LCD video where I take an LCD out. The steps are pretty close.
@@FixitFrank thank you as always!
wouldn‘t it be easier to just remove the dmd chip from the backside (4 screws to remove the heatsink)
Not really. Then you have to take the whole DMD card apart. It chances damaging the connections between the DMD and the riser. If I was replacing the DMD I would probably clean it from the back but for this, going though here was fine and it let me show all the lenses better.
@@FixitFrank other ways to reach im a w1070?
Im sorry, I don't quite follow your question.