How Do You Clean A Sharp XG3900E LCD?

[Home PC Nut]

Has anyone every done this. I have had one for years and recently noticed that it needs a good clean as there is a lot of dust on the LCD panel & inside the actual lens which is showing up on screen.

I got the top cover off but am a little affraid of dismantling the lens assembly in case I mess something up on the alignment.

Also unsure as to where I blow the non liquid compressed air onto the LCD panels and where exactly are they?

Please can anyone help or point me in the right direction.


Many Thanks

[Kramer]

Have a look for a post/thread by Calibos. He posted some internal pics of the LCD panels on a Panasonic model. Some instructions also.

It will at least give you an idea.

I'd say a proper clean is in order given the age, dust/contamination is most likely "baked on" at this stage but a good blow out might help.

Best of luck with it.

[Home PC Nut]

Could not find anything on Calibos thread. Can anyone else help as I had a look and need to potentially dismantle the 3 LCD colours as the dust is not reachable just by blowing between them. Would I be doing any harm by reverse engineering the dismantling procedure when re-assembling. I'm thinking of things like alignment of the RGB, Focus etc etc

[theritz]

I had a look and need to potentially dismantle the 3 LCD colours as the dust is not reachable just by blowing between them. Would I be doing any harm by reverse engineering the dismantling procedure when re-assembling. I'm thinking of things like alignment of the RGB, Focus etc etc

It's your own business but my advice is DON'T DO IT !!!!!

The chances of you getting the three LCD panels back in place properly converged is remote, to say the least. I have read of one enthusiast who dismantled the optics of an AE100 and managed to get it back together (after a few unsuccessful attempts), but I wouldn't be encouraged by this. The chances are you'd continually have misconverged panels and never get them "lined up" again. Without a service manual I can't advise you on the dismantling procedure, but you should be able to get at the main circuitboard with three ribbon cables which go to each of the three LCD panels - this is the place to try blowing out any dust, making sure not to spray any propellant in there....

My 2c..............


Sean.

[Home PC Nut]

Thanks for the advice I'll give it a go.

[RTFM]

Don't worry about dust in the lens itself. This would be so far out of focus you would never see it on the screen.
A lot of the dust in the optics is often on the polarising filters which are pretty close to the LCD panels. These can often be removed and cleaned quite easily without upsetting convergence. If you do remove them, make sure you mark their position so you get them in the same orientation on reassembly.
A lot of LCD projectors have the LCD panels permanently fixed to the prism assembly thus there are no convergence problems. I have lifted out the whole LCD/prism assemblies on units like the Sony 400 which makes life easy for a thorough clean.

Worth taking some pictures with a digital camera before you start taking things apart.

But as Sean says "don't do it" unless you are prepared to face the music if you F*** Up.

Good luck.

[theritz]

Jeff,

But as Sean says "don't do it" unless you are prepared to face the music if you F*** Up.

It didn't occur to me to express it quite as succinctly as that ...

Sean.