I have a large rear projection tv and the colour isn't right, the reds are too red and other colours don't look right but then the picture looks dull at other times. I have tried adjusting the settings and converging colours but doesn't make any difference. Is it something that can be fixed or is it beyond repair?
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Re: colour problem on rear projection tv
This might be something really simple... In a large number of DPTV310 chassis, of which this TV is, the yoke connections where put in place with black electrical tape just below the retaining rings. Job is to loosen the rings, remove the tape and push the yoke back in place and tighten down retainer.. Be careful not to throw off the tilt of the yoke.
The adhesive on the tape, over time, gets hot so many time it becomes slippery and allows the yoke to fall away from it's position dulling the look of the image (or focal length) causing the problem you're describing here...
It also throws off the convergence - so in attempting to converge it just looks worse.
I have a 51" rear projection hitachi. it has two screens on the front and during travel the first screen blew out and smashed on the road. now the image comes projects through the srceen. do i have to replace the front screen or is it something else. and if it is just the screen where would i get a replacement?
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Generally Tv screens use three different colours to make the picture, and if one or two of these colours don't show you will see the picture but in specially one colour (like looking through a red filter in your case). If you are using an input into the TV (DVR or Games console etc) then I would firstly move the cable around in the back of the TV and the console to see if anything changes or flickers in and out of being correct. If this does happen I would recommend buying a new cable to fulfil the purpose. If this does not happen and you are still seeing red then there may be an issue with the connection inside the back of your TV, this shouldn't be a very expensive issue to fix as you are still getting a picture but I would recommend getting a specialist to check it out if you are not confident in fixing this manually. Thirdly and most unlikely is the settings inside the TV have changed, some TV's like yours will allow you to change colour settings on the screen. I would go into the menu and find the section that allows you to change the colours and have a check to see if any of the settings seem off.
With most rear projections there is usually an alignment to do with the set up with your TV. This is so the red, blue and green projectors align together to give the correct colouring. This sounds to me what may be causing the outlining of the blue. This can also make it seem off colour. Look in the set up menu of the tv and see if you can find this alignment feature. Usually a cross will appear and you move a blue, red, and green cross with the arrows on your remote to align over the original white one.
If this does not work, it may also mean that one of your projectors, that is the red, blue or green one may be failing causing the off colouring. Hopefully this alignment may fix it for you.
If your picures are all purple it means that the green colour is missing. TV colour is made up by mixing Red, Green & Blue. Removing Green leaving Red & Blue makes purple. Study the green colour circuit for a fault and confirm that the green gun inside the tube is working.
I have a similar problem with an LG (except my red is the one that is fine) and was able to talk to a tech in some detail about it. The tech prefaced by saying that he had done a hundred or so of these with exactly the same issue. This is very common and the life span of rear projection televisions is not great. Having said that, plasmas and LCDs are also limited in life span mostly due to modern high performance gaming machines which shorten the lifespan of monitors both plasma and LCD alike.
From what I have gathered, this is not a problem that you can easliy sort out. (Of course they would say that though) It involves replacing the digital board which means soldering followed by aligning the lamps which requires quote a lot of expertise.
The part itself apparently costs around $200 Australian and the labour will vary for the cost of the technician but I was quoted that the labour was about the same cost as the part.
Not sure if I would call this solved but I hope it has been at least a little helpful.