Once the projector is plugged in there is no picture. The projector comes on but the lens doesnt open

The focus knob is the way you focus overhead projectors. Perhaps you simply haven't turned the knob far enough? How far is the projector from the screen? If it's quite close, you need to turn the knob to raise the lens. If far away, turn it to lower the lens.

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1,the interface between the mother board and DMD drive board
2,to clean the the interface with some alcohol
3,securely plugged

any questions, feel free to contact me
We supply original projector lamp,bulb,accessories,Lcd panel,Lens,DMD chip,color wheel,motherboard,powersupply,ballast... with high quality and competitive price.
have a nice day!
Jerry,Lampdeng Limited

Hi! This is a pretty common problem with overhead projectors. At the top of the arm that's over the unit, there should be a lens unit. The unit needs to be rotated so that one lens points down, and one lens points towards the screen. Once the lens is rotated properly, the lens unit is moved up or down in order to focus. There's usually a knob to turn to move the lens up or down.

Thats call keystone. That happen when projector is not properly align with screen. Most of projectors come with digital keystone corrector in the menu settings. Ensure is setup to 0 and check lens of the projector is at the center of the screen. Also if the projector is too high or too low will cause that problem too. Just move it arround until you find the right place to mount it. Best of luck

I think it's capacitor issue on the power supply board. open it, look for power supply board and fine bloated capacitor and replace it.

Press and hold the two Keystone buttons on the top of the projector. Turn the projector ON and continue to hold down the two Keystone buttons for 15 seconds.
Release the Keystone buttons.
Turn OFF projector.
Turn ON projector, lamp should strike.

hi the power supply of your unit is burnt refer service personnel
shyam
+919867355202

open your projector cover. Search for orange-chrome wire connecting between your lens card( i guess ) and above main board.Maybe this wire doesnt connect properly

I have an Optoma EzPro 737 DLP projector that accumulated dust inside the lens and for ages I couldn't figure out how to get rid of it. It cast shadows onto the picture and scattered light outside the edges of the picture. I thought I'd have to dismantle the whole lens assembly (then realised that this is virtually impossible without being an expert). I then stumbled upon a little black rubbery plastic panel on the side of the light path, which unclips. I then realised that the dust had built up on the lens that sits in front of the DMD chip (the thing that makes the picture).

Here's what I did, with the case open and having vaccuumed out all the dusty parts of the projector to avoid making the situation worse:
- Took off the little rubbery panel,
- Removed the lamp from the projector and placed a flashlight inside, shining into the light path (or a mirror directing light from a table lamp above)
- Looking directly into the lens from close up, you should be able to see the particles of dust stuck to the inner lens (with a nice magnified view)
- First tried blowing air into the gap on the side of the light path (I used a balloon pump).
- Next, I poked a piece of thick nylon fishing line into the hole so that it could touch the surface of the inner lens.
- While looking into the lens, I could see the tip of the nylon, then directed it to the largest dust particles and used it to scrape them off (nylon is much softer than glass, so won't scratch the lens).
- This was quite time consuming but I got rid of the most obvious bits.

I'm not sure how different this would be for another model of projector - but I hope it helps!