Someone please solve LCD PJ dust blob problem

Well you have the options of...


Vacuuming from the outside through the vents or

Blowing compressed air in through the vents..


Both Non destructive and warrantee proof or..


Opening the PJ up and blowing compressed air inside which I think voids warrantees..


I have opened mine up many times and it needs another now / soon...


Some things to mention.. The first time I did this I used compressed air from a camera shop and had a nightmare when it squirted out a load of liquid propellant (they have a tendency to do this) all over the DMD resulting in smears !! I had to really strip it down then to clean the DMD with isopropyl alcohol... Since then I have discovered a really neat little kit sold for cleaning out dust in keyboards and PC components.. It comes with a little 'trigger' gun and uses those compressed gas 'bullets' like old soda stream machines used (remember them http://www.avsforum.com/ubb/smile.gif )... This is a far far better solution all together...


I will dig the kit out and see if it has company name / url on package as it really is a perfect PJ cleaning tool !!


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HTPC without using windows... GUI Front Ends for Home Theater

Quote:
To help avoid the propellant issue, release about 1/3 of the propellant from the can* (you will be able to feel the colder liquid inside to guage what 1/3 is) before getting it anywhere near your projector. Then, while spraying make absolutey sure that the can remains upright and you should have no problems.


*note - you should let the can sit a wihle after releasing a bunch of propellant, so the can / nozzle are closer to room temperature, this will hep ensure complete vaporization of the liquid in the can as it is expelled.


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Darren Rogers

Glad to report the big blob is gone after vacuuming; sadly a much smaller blob has appeared elsewhere. I guess the vacuum wasn't able to suck out the dust particles completely. I will give it another try with the vacuum before following Darren's directions on using compressed air.


SFC;

My take on this blob/dot problem (after going through the various posts) is that green blobs not matching the pixel boundary are dust particles that can be removed using one of the methods mentioned above. On the other hand a blue dot (some have mentioned red) confined exactly within a pixel is a dead pixel. Although no one has yet mentioned a procedure to resuscitate a dead pixel in this forum, I have heard elsewhere that leaving the projector on overnight can "awaken" the non-responding pixel.

Your problem seems to be of dust on the LCD panel. You can probably remove the dust following the above procedures.


Hope this helps.


MAK

SFC:


1. Get a can of compressed air and blow it down 1/3rd first.


2. Remove filter from projector, clean thoroughly and use a crack tool with a vacuum cleaner to thoroughly clean the area under the filter.


3. Take top off of projector and gently turn it on it's side on a clean, flat surface. You'll easily see the DMD assembly, consisting of 3 panels at right angles to each other, and the back of the output lens. Putting the projector on its side makes it easy to hold the can of compressed air level. It also helps the dust to blow out and away from the projector.


4. Clean the inside of the cover with the vacuum using the soft brush tool.


5. HOLDING THE CAN LEVEL AND NOT MOVING IT AROUND RAPIDLY OR JERKING IT blow all in and around the indside of the projector, doing the DMDs and rear of the lens assembly LAST.


6. Put the projector upright and carefully reinstall the cover.


7. Hereafter, vacuum the underside of your projector about once per week, using the vaccum to "back suck" the filter. I don't remove the filter as it might dislodge dust.


This operation will take no more than 15 minutes. I've done it twice to my Sanyo XP21N in a year.


email me at [email protected] if you have any questions.


Dan