The picture went green. I was able to replace the DMD board with a used one and the picture returned just fine. Shortly after, the sound began giving problems. At first is would have no sound when you first turned the set on, the after a litte time, the sound would begin to work spotty at first then it would be ok until you turned the set off. Now the only sound the tv speakers make is a clicking sound. It makes this sound anytime the set is on. We listen to the tv through a separate stereo receiver and speaker. Any suggestions are appreciated. Thank you,
Thank you Vladimir. There are not external speaker jacks. I suppose I can go into the cabinet and splice in another speaker. Do you suppose that both speakers would have failed at the same time? I believe that the problem is somehow related to the video repair that I did. Is there some compatibility issues with different DMD Boards?Thank you Vladimir. There are not external speaker jacks. I suppose I can go into the cabinet and splice in another speaker. Do you suppose that both speakers would have failed at the same time? I believe that the problem is somehow related to the video repair that I did. Is there some compatibility issues with different DMD Boards?
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Is the Lamp ok? Go to the rear of the set and turn on the set with your remote while looking at the vent slats. If you can see a bright light through the vent slats then your Lamp is working. If the lamp is on and you have sound and no pix, then the Digital bd is in what we call "Video Mute" and will have to be replaced. Also make sure that the Lamp Door is installed and the screws are tight also check to ensure the following..... 1. re-seating the DVI cable on both sides 2. Check to be sure the lamp door sensor is closing (that is not your issue but i thought i would post the complete answer) 3. Check colorwheel is spinning up (should be a low hum, and not sound like a fan) *** it is very possible it is a failed colorwheel, but the set should go into shutdown, so it is probably not the issue. 4. If the set has sound but no picture replace DMD board....
If the set is working and then just stops working best bet is the DMD ( i would not replace just the dmd it is cheaper in most cases and much easier to replace the lightengine) but if the set just is not working and just failed and is now always not working best bet is the digital board.
If you have an osciloscope you can measure the video signal from the Digital board and see if it is present with the no picture, if it is then it is a bad DMD but if the video signal disappears of then you have a failed Digital board. You can not us a computer USB scope, they can not read most of the data from the digital board since they use multiple scan rates and wont trigger on them for some reason, a old school scope works best i have found, or one of those new LCD scopes that have an auto trigger work well i have found that it is all i use anymore.
you can find a service manual with schematics at a very cheap price at ebay......
Hi,Yes your problem sounds like the DMD board.This is how it works: http://electronics.howstuffworks.com/dlp1.htm Basically the light of the lamp goes through a tunnel that carries a color wheel(rotating disc with a gamma of colors that creates the colors on your tv)then the light of the lamp goes through the DMD board which is a chip composed of around 2 million pixels that creates the images and colors.When it starts to fail it will create black bars,pixelation,color distortion or white dots on screens. Here's a video that will help you find where the DMd chip is located : http://www.youtube.com/watch?v=0jr_9A5Xd2Q Have a blessed one!
Hi,Yes your problem sounds like the DMD board.This is how it works: http://electronics.howstuffworks.com/dlp1.htm Basically the light of the lamp goes through a tunnel that carries a color wheel(rotating disc with a gamma of colors that creates the colors on your tv)then the light of the lamp goes through the DMD board which is a chip composed of around 2 million pixels that creates the images and colors.When it starts to fail it will create black bars,pixelation,color distortion or white dots on screens.You will need to replace the DMD board. Have a blessed one!
Hi,do you hear any strange noises? If you hear clicking or like wanting to turn on it could be the board that powers the lamp it's called the ballast.Here's the instructions to replace it for a samsung ,it works like your mitusibishi:http://www.fixyourdlp.com/guides/samsung/bp47-00033a.php The ballast has a sensor that detects when it's not able to power the lamp or if lamp is not responding,it will flash red when that sensor detects that.When you say: "it began to roll like the vertical and horizontal hold did not work
then the sound went out" Do you mean you where getting horizontal lines? If you did that could be the Dmd.his is how it works: http://electronics.howstuffworks.com/dlp1.htm Basically the light of the lamp goes through a tunnel that carries a color wheel(rotating disc with a gamma of colors that creates the colors on your tv)then the light of the lamp goes through the DMD board which is a chip composed of around 2 million pixels that creates the images and colors.When it starts to fail it will create black bars,pixelation,color distortion or white dots on screens. Usually when there's a green light it could indicate a problem with the power supply,sometimes some capacitors do go bad. Check all of this and comment on this answer to see how it went.
It seems you might have an issue with the dmd board.
Go to the menu, and if the dots still show on the menu, the issue definitely is with the dmd board but if they don't come up on the menu, the issue will be with the video board.
When you replace the color wheel on certain models you must remove a jumper plug on the DMD board. There is a service bulletin that is usually included with factory replacement color wheels. If the color wheel has a whine to it that means it is probably used and came out of someone else's set. Anyhow the plug can be accessed as I recall without removing the shield of the DMD board. I know this because my first one of those gave me grief, too. Samsung changed wheels on different versions of the same model tv so it gets confusing. You should be ok though after adding/removing the two pin plastic jumper from the DMD board. The only other thing I saw cause a green picture eas the plug that goes from the DMD to the digital board can develop bad connections and can be replaced with a regular DVI type cable. Hope this helps, Russmann.
I suggest unplugging your entire system for one minute to try a reset again. Sometimes a system reset doesn't take the first time. If this does no good you probably have damage to your digital board or dmd board. I have a smaller version of the same set at home and have done samsung's warranty service for several years. They deliver a great picture but do need regular maintenance and or repairs. The upside of all this is if you have homeowners insurance it may be covered, depending on your deductable amount. However, a dmd board can cost 500.00 so you may have to go that route. Hope this helps, Russmann.
Here's something that might also be useful. After you turn on
the set, and get the regular red blinky lights, hold down the Device
and Menu buttons together for about 5 seconds.
The Power light will start to flash in a two digit sequence.
For example, 3 flashes, then 7 flashes = 37.
Here are the error codes, and the corresponding problem:
12 = No error detected, check power supply.
32 = Lamp Cover is open.
33 = Air filter cover is open.
34 = Lamp abnormality
36 = Light Engine (DMD or Lamp Fan stopped)
37 = Exhaust or Lamp Ballast Fan stopped
38 = Lamp Temperature High
39 = DMD Temperature High
41 = Short is detected
44 = DVI cable between FMT and Engine disconnected
there are several things that need to take place for the lamp to turn on. first the color wheel needs to turn on ( if you can hear a whinning noise then this is fine) next the tv will send a signal to the lamp ballast to turn on, and the ballast needs the 130v dc supply from the power board ( simoly remove the lamp and reinstall the lamp door, turn tv on, and if you hear an arcing noise from the ballast you know this is fine too. the board that controls all of this is the dmd board. so if the color wheel works, ballast starts then i would replace the dmd board....
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