I need to remove 2 blob dust in projector ptae2000

Most likely your DMD chip has dust or hair on it. You can try blowing it out with compressed air but the best thing is to tear down and clean the dmd chip itself. Very carefully. Here is a video of a similar unit. SO far all the DMD projectors I have worked on have had a very similar set up. Take pictures as you go.
MItsubishi XD206u DLP Projector Lens Assembly Cleaning

Are they sharp and defined, or 'blob'-like? If they are sharp, that would indicate a faulty DLP block (not worth repairing, unless under-warranty.) If they're more 'blob'-like, it's probably just dust in the optical block. That can usually be remedied by removing the lamp, and blowing-out the unit with an air compressor. Canned air won't do the job, as there's not enough pressure.

1. Remove the air intake filters on your DLP projector. As explained by InFocus, a manufacturer of LCD and DLP projectors, each DLP model will house the air filters in a different location. However, for most DLP projector products, the filters are accessible by unclipping a simple plastic latch.

2. Wipe the air filters with a small cloth dipped in rubbing alcohol.

3. Blow compressed air into the unit's vents. This will force some internal dust out of the DLP projector, but you may still need to open up the unit for additional dust removal.

4. Unsnap the main cover from your DLP projector. Because DLP projectors need periodic lamp replacement, the main cover is rarely secured with screws or bolts. However, if the DLP projector's cover does not snap off, then you'll want to inspect the unit for possible screws or an alternate release latch.

5. Reach in and remove visible dust globs with a paper towel. Be careful to avoid touching the lens, as fingerprint smudges can diminish DLP projector image quality. If you accidentally smudge the lens while picking out dust blobs, wipe the lens with a dry, lint-free microfiber cloth.

6. Spray compressed air into your DLP projector to remove any lingering dust particles.

7. Close up the projector and reattach the filters.

I am assuming that the "bubbles" are most prominant when the picture is dark. If that is the case, it is most commonly referred to as dust "blobs". Dust particles get on the lens assembly inside the projector and are just out of focus so they appear as blobs or bubbles. If you can carefully remove the cover and gently blow out the lens / color wheel area with compressed air it should reduce the "bubble" effect. I would not recomend any further dissasembly as it is complex and time consuming and unless your very careful, could end in disaster. Don't forget to clean the air filters either.

Hello :

What you are seeing is dust on one of your LCD panels. Try pausing your image so that these abnormalities are clearly visible Then simply de-focus your projector in BOTH directions . You should see these blobs actually become a solid object either in the form of a string of lint or a spot of dust. If this is the case , then I recommend you to contact the manufacturer or the local dealer .

PLEASE RATE !

remove the rear cover then the top and look to where the lcd cables go down from the main board to the lcd panels. move the cable 1 at a time towards the connection on the main board just so you can see down into the panel and give it a good blast. de-ionized air works best. repeat for the other 2 panels.

the yellow blob is from a fried polarizer on the blue lcd panel due to excessive dust and heat. you'll have to replace it, but hitachi doesn't sell individual optical engine parts, so you may have to replace the whole optical engine.

blow out any dust with canned air. chances are there is an object blocking the image. or there is a crack or burn spot on the 2nd fly-eye lens (diffuser). the first one is right next to the lamp (if you remove the lamp, you'll see it). the second is right on the other side of it.

I had an issue with "dust blobs" on my HD70 and was unable to locate instructions or a tutorial on how to remove them. I figured maybe this could help you if the hair is located within the same location as the dust. Please check out my blog at http://tantht.blogspot.com/ for instructions on how to remove dust blobs from a HD70 as this process worked perfect for me and I no longer have these annoying spots when watching movies!!

2 ways. There are two access panels about mid screen on the sides of the cabinet. Or you can take all of the screws out and take the whole screen apart ,all the way down to the lens on the projector. It is up to you. If you are pretty mechanincally inclined then take the whole cabinet apart, as you will be able to clean more of the cabinet. Use a microfiber cloth to clean both the screen and the rear mirror. Hope this helps. I usually clean mine every three months or so.