Question about Optoma HD70 DLP Projector

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My hd70 colours are changing from red to green etc

It does it and then settles down i thought it might be the cable

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Have you gone for replacing the cable yet. Also try to reset the Projector at Factory setting.

Posted on Dec 04, 2008

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Hey its definitely the VGA cable one or two wires inside are cut or not touching properly try another cable or another input.

Posted on Dec 04, 2008

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2 Answers

Optoma HD70 bulb failure


I am betting that the ribbon cable to your color wheel has become loose. Here is a detailed slide show of a similar model so note where the cables are and check each one.
Optoma HD20 DLP Projector DMD repair turning green and flickering

Jun 25, 2013 | Optoma HD70 DLP Projector

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My optoma hd70 projector which is 4 years hold has worked perfectly. However when I switch it on it works for a few minutes, then the screen turns various colours, it makes a funny noice and then switches...


The color wheel sensor needs good cleaning. an optical lens cleaning liquid might help. also clean the fans and vents if you open it. I had to remove the sensor and clean. then it worked.

Jul 01, 2011 | Optoma HD70 DLP Projector

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I hv Sanyo PLC-SU07N Projector - the image is blue


I have a possible solution however it may not be THE solution your after, you'll probably be able to tell very quickly if it isn't, this will only apply if you are using either a component video signal or a PC/laptop signal to send to the projector.

If you are using a laptop or desktop to hook up your projector, I would try first of all double checking that it's correctly plugged in, and if you still have no luck try a different cable.
It's likely to be the cable because when the signal goes down the cable it's split into 5 different signals. 3 of these are the colour information for Red, Green and Blue. Depending on what you mean by 'image is blue', it could mean that your either not getting the information for Red, or your not getting the information for Red AND Green. If you want to test this, open up microsoft paint while connected to the projector and create 3 boxes, then fill 1 completely red, 1 completely green and one completely blue. If you are missing the information to any of these colours then that colour will appear black on the projector screen.

In component video the signal is split down 3 cables (rather than 5) and 2 are colours (rather than 3)... Red and Blue. Check that the cable running red (Usually labelled Pr on the DVD and projector) is completely plugged in (some of these are really tight, but it's important that it goes all the way) and also that you have plugged into the correct slot, for instance that you have plugged into Pr and not the right Audio channel, both of which are coloured red.

If you are still not having any luck then I would suggest using a computer monitor or a television (depending on what type of signal your sending it) to test the projector. Plug it in instead of the projector and if it works then the issue lies with the projector and I have at least narrowed it down for you.

Hope this has been helpful.

Mar 28, 2011 | Sanyo PLC SU07N LCD Projector

2 Answers

I see no red and green colors on screen projected by pjtx 100, the rest of the colors are visible.


If you are using a component video cable (Red, Green, Blue) you may simply be missing the Red cable. It may not be fully plugged in.
You can verify that this is the case by: 1. Unplugging all video cables 2. Plug in the green cable, you should see a black and white image. 3. Plug in the blue cable, you should see some colours coming through. 4. Plug in the red cable, you should see all colours properly.
If not, unplug the blue and red cables and plug the blue cable into the red port. The colours will look incorrect, skin tones will be blue. If the colour comes through the problem is the cable. If the colour does not come through, the problem may be the projector.

Feb 28, 2011 | Hitachi PJTX100 Multimedia Projector

1 Answer

HD70 DLP Projector: The projector is used and about a year old. It cur...


Did this start occurring after you replaced the lamp?

The reason I ask is I had the same issue after changing the lamp and it was caused because when I took out the old lamp I noticed dust in the lamp housing which I attempted to blow away.

This caused the problem because some dust got further into the projector, specifically around the color wheel. I sorted it out by taking the projector apart following the instructions here:

http://tantht.blogspot.com/2009/02/how-to-remove-dust-blobs-from-optoma.html

(note my HD70 was out of warranty, if yours is not, I would recommend contacting Optoma to get it fixed).

Follow the above instructions to step 14 and then locate the color wheel which is at the front of the projector behind a dark gray, plastic type square shaped cover.

You have to be very careful here, but remove the color wheel (there is one screw holding it in place) - note it

May 18, 2010 | Optoma HD70 DLP Projector

2 Answers

When trying to watch a film off the computer through the projector the colour red comes out green on the projector.


check your cable and use a different laptop or desktop to eliminate the projector. always do a factory reset.

Sep 08, 2008 | Mitsubishi SL4SU ColorView Multimedia...

1 Answer

Projector problems


Hi, I have an Optoma EzPro 751 that had a similar problem, although it got progressively worse until it only took about 5 minutes to begin acting up. I was really frustrated, as the bulb only had around 600hrs at that point and the picture was bright. After some searching of forums like this, I found someone else with the same exact problem, but with a Dell projector (made by Optoma).
The culprit was LOTS of dust, built up on the circuitry, built up on the optics, built up everywhere! Solution: carefully open up the case and use canned air or an air compressor with a blow nozzle attachment. (warning-compressor air MUST be filtered first as it otherwise contains moisture and other harmful suspended contaminants)
I was at the end of my rope, and this really worked for my problem. It's worth a try, but BE CAREFUL! There are delicate parts in there you don't want to blast apart with air. If you use the cans, buy several as it took me quite a bit of blowing with a compressor regulated at 90psi to get it all out. Good luck!
-Paul

Jul 17, 2008 | Optoma HD72 Multimedia Projector

1 Answer

Problem: Green colour cast


Problem resolved by swapping the video cable, simple really!

Feb 13, 2008 | Sony VPL CS5 Multimedia Projector

1 Answer

Colour problems with projector


In short If the reds show as red, The greens show as green & Blue shows as blue. I would say thats as good as it can project. It's hard to judge color without seeing it for ones self but usually DLP projectors that use a colorwheel do not have perfect color.

Feb 13, 2008 | Office Equipment & Supplies

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