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Discussion Starter · #1 ·
I've searched and haven't found a definitive thread on how to clean dust blobs from a PLV-70. So, I'm hoping that this thread is going to be it!


Here is what I've found:


1) If you set the focus all the way in one direction (I can't remember which direction), you will see all the dust particles that have landed on the internal parts of your projector (assuming your lens is clean):


a) The large dust particles are visible as dust blobs.


b) The small dust particles are invisible in normal operation.


2) If you remove the top cover, you can see a light module which has 3 LCDs on 3 sides of a cube. Looking down at the projector with the lens facing forward, the green LCD is at the bottom of the cube. Red and Blue are on the left and right sides. My feeling is the most blobs are green because the air flow is able to move more easily past the green LCD because of the direction of air flow. Red and Blue are practically perpendicular so there is less chance of air flowing past the surface of LCD.


3) It looks like in order to use a air canister, you will need to turn the projector sideways so that the air canister can be upright.



Here are my questions:


1) Assuming you don't break anything, I assume this doesn't void warranty for Sanyo units?


2) Do you need to remove the front cover (plastic around lens) to remove the top cover?


3) Can blowing air across the LCDs (into the light module) cause convergence problems?


4) What are the consequences of not cleaning dust blobs? Can the dust become fused to the glass/LCD if you wait too long to remove?


If anyone has any definitive answers on how to clean dust blobs, please post! I need to find out if I should clean my dust blobs myself or send it in for service.


Thanks,


John W.

San Diego, CA
 

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Many have used canisters successfully, but there is the danger of gunk spraying on your panels if 1. the can is too full, 2. the can is too empty, 3. the can is tipped.


My husband used a bulb syringe - the rubber kind with a long, narrow tip. The one he used came from a camera shop. He was able to blow out all the blobs, even the bright, big, green one!


He only removed the large cover, nothing around the lens. Be careful of the wires attached to the top of the lid that control the buttons and lights on the lid itself.


No, there should be no convergence problems since the panels are welded. We were careful to touch nothing within the projector.


The Sanyo rep told my husband how to take the cover off. He gave us the option of cleaning it ourselves or sending the unit back for cleaning at their expense since the unit was brand new at the time. I am very glad we cleaned it ourselves.


I don't know anything about fused dust. I do know I can send it in to my retailer for professional cleaning (was that $50? I don't remember) anytime I choose to do it.
 

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John -


I have cleaned mine with a compressed air can.


"1) Assuming you don't break anything, I assume this doesn't void warranty for Sanyo units? "


Shouldn't. Numerous people have checked on this and been told it's OK.


"2) Do you need to remove the front cover (plastic around lens) to remove the top cover? "


No, but you do need to remove the two screws (bottom front) securing it to allow the main cover to come off easily. As Dawn says be very careful of the wires conecting the control pad on the cover to the main unit.


"3) Can blowing air across the LCDs (into the light module) cause convergence problems?"


Yes, if you use the little tiny straw that comes with many of these cans, its output can have sufficient force for it to deflect these components, so use care!


"4) What are the consequences of not cleaning dust blobs? Can the dust become fused to the glass/LCD if you wait too long to remove? "


I was also curious about this, but I think it is a non-issue. I left dust blobs in mine for several dozen hours, with the PJ on continuously as long as 8 hours during this tmie, and they all cleared out fine.


The first time I cleaned it, the dust blobs returned with alacrity, so I would definitely suggest the ugly foam prefilter technique once you have done this until a more elegant solution presents itself.


I did turn my PJ up on its side and support it to do the cleaning. This ensures you can keep the can at an angle to avoid it spraying condensation or aerosol propellant.


Also, be sure and use a half full or so can. If you have a brand new one, use it to do something else first to get its level down a bit.


If you want to talk on the phone about this, let me know and I'll PM my number to you (I'm in LA).


BB
 

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Well, the optimists club used to have them.


I've seen them elsewhere, but for some reason, they were labelled "half empty or so", so I wasn't sure they were EXACTLY the same thing.


BB
 

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Yes there's a big difference, if I lower my screen to the middle "or so", it's exactly halfway up.

But I don't know how to convert that reasoning to can's.


Morbius has a formula I'm sure.
 

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For any ozzys reading this thread,

the official line from Sanyo Australia is send the projector back for dust blob cleaning. Opening the projector yourself will void the warranty.

They wont even allow retailers to do this.

Hopefully they will lighten up after they've had a few of them in.


Malc.


Edited to clarify Sanyo Australia only.
 

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There are varying stories, and Malc has just reiterated one of them, Sanyo has told me how to clean (instructions )mine and said no warranty issues. Maybe it depends what continent your on or who you speak to. Anyway it not a difficult procedure to do it yourself if you take proper precautions and don't rush.


Put on a pre-filter when your finished and you won't have to clean again.
 

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And I was told my a tech at SE that opening my 20HD voided the warranty, while others were told by (I assume) more senior SE people that this was not so, only any resulting damage would not be covered.


BB
 

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I have 3 dust blobs. noticable during dark scenes. I got them when cleaning the filters. I have done that twice so far. probably preamature cleaning.


When I cleaned them I used a vacuum but when I think about it. I suck one side (the dirty side) I am acually appling dust on the side you don't want dust. i am sure particles are not going all the way threw. some must get hung up on the filter, thus when the filters are placed back in the plv70 and you turn on the fan those stuck particles are now free to move about and grab a hold of my precise lcd's. every thing was fine until I tried to clean it. It's not bothersome at all though. Picture is still awesome.


Sanyo shuold put pictures and litature on how to clean filters and blow out the panels.
 

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Oooh, Jimmy, if you're going to pick on my typos, you'd better brush up on your hunting and pecking as well. :)


Ha! I fixed my post, so now yours just looks silly.


As Larry says, I would advise anyone removing the filters to clean them to put the inside surface against a clean piece of paper or some other filtery medium, so you are not sucking whatever is floating around in the air stirred up by your vacuum's exhaust onto the interior surface of the filter.


BB
 

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After having my PJ on for a couple of hours, I noticed a greenish blob at the top of the picture. I called the store where I got it (Presenting Solutions, good service, one of the best PJ return policies) and they gave me some contact #'s at Sanyo. I wound up leaving a message describing the problem for Bruce Gibson, Technical Support Specialist, at 818-998-7322 x287. He called me back within a couple of hours and said that since the unit was fairly new, I could sent it back to them for a free cleaning, or, I could clean it myself. He gave me directions, then even faxed me diagram detailing how to disassemble the unit for cleaning. He also said, "...the dust particles may be stuck to either side of the LCD panels, or to either side of colored glass filters which are right next to the LCD panels." He recommended using a pressurized air canister that is safe for use even when upside down (gave the brand of Stoner 360 degree spray).


That took care of the problem for a few movies, but dust returned. Prefilter is going to be the next step.


border592
 

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border592,


I know it's been a while, but do you still have those diagrams? Could you scan them in and post them somewhere?


Thanks
 

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Just pull the filters and put something in the fan so it won't spin. Then put a "power vacuum" at the filter inlets. If that doesn't work there's only five or six screws holding the top of the case so you can remove it. Get a camera "bulb" air cleaner to blow off. Don't physically touch the panels or mirrors.


After cleaning make a "pre-filter" so it doesn't happen again .
 

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Hey all, maybe someone else has already posted this, but if not, I have tried the compressed air canisters (have to be careful so the liquid doesn't spew out); the camera "bulb" air cleaners (not enough power); a little vacuum/blower made for electronics (again not enough power), but by far the best solution has been a wet/dry vac. The one I have allows it to be used as a vacuum or blower. With a narrow nozzle attachment, it will blow every dust blob out of the unit. The best cleaning I have seen. As an alternate, I believe it is powerful enough to suck the dust blobs from the air filter inlets. Good luck. Make sure you take the filter out first so you don't suck them through.
 

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buckeyes fan,


How powerful is your Vac? In terms of Amps? Thanks.
 

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Careful with a wet/dry vac set to blow. Any dust in the hose could blow right into your PJ. Mine gets used a lot and a nice cloud of dust comes out for a bit when I flip the hose around to use it as a blower. The cure could be a lot worse than the illness. ;)
 
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