I had a similar problem.
My TV started to flicker and I put a new bulb in. The new bulb did not help, even if ot is good to replace after a couple thousand hours.
I found out that mu heat sink, which is sitting on the CPU with the mirrors came loose and the unit overheated and shut off after flickering a while.
Try to take the lower back panel off and you see a heat sink which is sitting in the center of a aluminum sheet metal piece. Disconnect the wires which are attached to the circuit board behind the sheet metal. Then take off the screws holding the sheet metal and pull it gently off. It will take a little force, but it does not damage anything.
Now you see the heat sink on the circuit board heald by a latch going across the heat sink.
On the upper right corner you will find the handle to open the latch. Once you did it, you can take the heat sink off and see the main CPU (as I took the latch off, my heat sink fell off).
On my heat sink the Heat Sink Compound Paste creating the connection between the CPU and the heat sink dried out and became brittel, so there was no connection anymore and the couldn't be transported out through the heat sink, which is cooled by the fan sitting on the left.
I took the brittel Heat Sink Compound Paste off and applied a generous portion of the one that I bought at Radio Shack. I used Silicone-Base Heat Sink Compound which ran $4.99 excl. tax.
After applying the paste put the heat sink gently in and when you do, you will feel like a suction indicating that you have a connection between the CPU and the heat sink.
Now you need to put all parts back together.
If you are not familiar with electronics and those wires it wouldn't hurt or would be wise to mark the connectors and make pictures before removing them. This will save you a lot of frustration.
I hope this helps you and brings your TV back to live. My TV was cutting out after 25 minutes and runs now like a charme.
PS: If you experience a black screen with vertical stripes (mine were white and green) then most likely the light engine needs to be replaced, I had this after 9 months and got this fixed under warranty.
Hi I had same prob. after trying a bunch of things we took off the back of the tv and lightly sprayed can air into the color wheel area ( where the bulb faces) I used the long stick for the air can and put it near (not in ) the silver holes. I saw a piece of dust come out and tv is now fine. I think something gets in and blocks the color. I figured it out when I turned on tv ( after problems) and was trying to see if the lamp was going to blow (dumb yes) but when the tv light on the screen lit up (the one that tells you what channel you are on etc...) it went blue, it had always been green. That is why I thought the color area and sure enough!! I am elated to have fixed it. Hope it helps. Be careful though barely push the spray. The dust flew downward so maybe you could tilt can that way before you spray.
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This tv have a colors wheel.The colors wheel is dead.The tv have squiling,motor loud noises and back&white picture.All the indication problems of the colors wheel is dead.Call the tv tech.to fix this problems,because have to take out alot of manchanical parts.Before even can get to the colors wheel out to replaced it.
Samsung's digital light projection (DLP) televisions use a spinning color wheel to create the colors that are seen on the screen. If the color wheel becomes misaligned during use, it will become damaged and have to be replaced. Replacing the color wheel on a Samsung DLP television can be done at home, once a compatible-sized color wheel has been bought from a TV supply store.Replacing the color wheel yourself will void any Samsung warranty that might be in place, but is the only solution for getting the TV working again in as short a time as possible.
Put on the anti-static grounding strap to keep static electricity from damaging the internal components of the Samsung DLP TV. Turn the Samsung around so that the back is facing you. Make sure the Samsung is unplugged from the AC socket.
2 Use the Phillips screwdriver to remove all of the screws from the back panel. Put the screws aside. Pull off the back panel.
3 Loosen the two screws from each side of the projection bulb's case. Pull the projection bulb out. Put the projection bulb aside. Use the Phillips screwdriver to remove the two screws from the left side panel. Pull the side panel and the circuit board attached to it out carefully and put it down so that the cables attached to it have not been pulled out.
4 Take a picture of the power cable's position with the digital camera so that you can put it back correctly later. Pull the power cable out from inside of the Samsung's case so that the center panel is free to be pulled out. Remove the two large headed screws from the center panel with the Phillips screwdriver. Remove the top two screws holding the panel to the plastic case using the Phillips screwdriver.
5 Slowly slide the center unit out a few inches. Take a picture of the projector lens' positioning with the digital camera so that you can put it back correctly later. Unplug the two cables from the left side of the center panel. Unscrew the sensor switch using the Phillips screwdriver. Slide the center panel completely out of the Samsung and put it down on the clean cloth. Blow off the color wheel assembly with the compressed air.
6 Use the tweezers to remove the green plug from the top of the color wheel cover. Use the tweezers to remove the two cables at the side that are coming from the color wheel. Use the Phillips jeweler's screwdriver to remove the screws from the top, front and back of the color wheel cover. Slide the color wheel cover straight up to expose the color wheel.
7 Use the Phillips screwdriver to remove the three screws holding the color wheel to the color wheel assembly. Lift the color wheel up and out of the color wheel assembly and discard it.
8 Position the replacement color wheel in the color wheel assembly. Reassemble the color wheel and reassemble the color wheel assembly. Put the color wheel assembly back into position in the rear of the Samsung DLP TV. Reassemble the Samsung DLP TV. Plug the Samsung DLP TV back in for power. Turn the Samsung on and enjoy seeing the colors displayed properly again now that you have replaced the color wheel.
It could be that the picture tubes have gone down on emission, there is a prcedure that can be tried to bring up the overall brightness but it is just possible that you will loose some picture quality. If it's a 1994 projo tv i am thinking of the three crt system, a gray scale alignment would probably correct the dark condition in your picture, again depending on how far gone is the emission in your picture tubes, if your projo tv is the dlp system, the bad news is that you could be needing some light engine repair. The color adjustment is possible with the availability of a service manual or in the case of the dlp system, light engine repairs or replacement are available from some on line stores.
Looks like it's a color wheel problem-found a cleaning walkthru online, but it doesn't get rid of the loud hum form the CW motor. Also, it is thermal related-when the colors went out I placed a fan next to the color wheel and everything went back to normal. Several design flaws here and for $3000 these companies should do better-severe problems after a couple years is not acceptable.
If the sound, sounds more like a Hum with some vibration chances are the Cooling fan located behind the lamp is going bad, about $20 to repair, if its a high pitch hum most likely the Color Wheel and if thats the case about $30.
Good luck, my fan just went bad now seeing green dots everywhere, so debating on just junking it out or fixing it, with winter coming on might just breakdown and buy LCD and say the heck with DLP from now on.
Good luck to you..