Samsung DLP LED Color Flickering Issues

[Dumbsday]

Hi guys! I really hope you guys can help me out, or at least point me in the right direction. I searched the site for my issue, but given the weird specifics, it's a difficult one to find. I took video of my television as that's much clearer than me fumbling around trying to explain the problem.

I have this TV: http://www.amazon.com/gp/product/B00...ls_o05_s00_i00

It's a DLP LED hybrid that I got roughly five years ago.

It's doing this: http://www.youtube.com/watch?v=bLnnqURIqbI

It actually started a good two or three months ago, though not nearly as bad, but I didn't have the resources to fix it. Sometimes, after the TV would be on all day, it would go away. Just about a week ago, out of the blue, it went away completely and was fine for a good three or four days. All of a sudden it came back, worse than ever. I turned the TV off and back on and it was fine. Then the next day it came back again in the state shown in the video and it's not going away. The video doesn't do it justice, it looks so much worse in person.

Does anyone have any ideas? My friend suggested the LED driver board, so my plan right now is to take it out and test it (and hopefully not break anything). Thanks to anyone who can help.

[Dumbsday]

Re: Samsung DLP LED Color Flickering Issues

Here's something else that might help: http://www.youtube.com/watch?v=84j9V...&feature=g-upl

If you watch the video, you can see that the green flickering gets worse as I move things around, specifically to the left side of the screen. If I keep my video small and off to the right, it's a lot better.

[drpj23]

Re: Samsung DLP LED Color Flickering Issues

I must say I am new to LED DLP technology but from deductive reasoning, I am going to say it is not the LED driver board.

If that failed then in my opinion you would have no screen since that board is simply providing power to the LEDs. Your color comes from the DMD board.....more precisely the DMD chip on that board.

In an ordinary DLP set - a light source travels through a filter (color wheel) which produces the three primary colors. Then the DMD board (main may have something to do with this not sure) sets when the mirrors are to turn "on" or reflect light. For green, for example, the mirror will only turn "on" when green light is present and cuts "on" an x amount of times for the shade of the color. So, it is all basically all a timing thing. For LED sets, it is practically the same except you have a red, green, and blue LED that flash at very high rates.

So for LED DLP sets, the LEDs replaced the color wheel and lamp but the DMD and DMD chip are still responsible for the image and colors presented on the screen. So in my opinion, the DMD board. If there was a constant discoloration (like a red tint) I might say, might, the driver board but since (by the videos) this color prob is constantly changing with the picture I would say the mirrors aren't lining up with the colors correctly or simply timing is off.

If DMD board doesn't work then main would be my second choice.

[Dumbsday]

Re: Samsung DLP LED Color Flickering Issues

Thanks for the response! I should've been more clear about what my friend said. He didn't suggest that the driver board was bad, but that one of the color LEDs on the board was messing. Though, he did also suggest that the DMD board could be the problem.

I'll start looking into both.

[bluebuda]

Re: Samsung DLP LED Color Flickering Issues

LOL, I'm Dumbsday's friend who is trying to help him, let me clarify for him, I have about 2 and 1/2 years working on electronics but I have only worked on a LED DLP one time, I sent him here to hopefully get advice from someone who might know more about what they are talking about than I do. XD

Having said that, I think perhaps one of his LED color lights might be going bad and needs to be replaced, last time I worked with one of these sets it was the red LED light, and I suggested it might be the red considering in LCD projections the red filter tends to burn out first, anyways, after looking at this new video he has posted it looks like maybe the blue LED, but I'm just guessing because as I said I have only worked with one LED DLP.

Also I suggested perhaps the digital board might be bad, but I don't believe this as the problem seems to be a single color related problem.

I suggested he open the set, block the light from each LED one at a time and watch for the response, however, the TV is much worse now, last time I saw it he was having flickers of this problem, now it looks permanent.

Does anyone have any experience with LED DLP that might be able to offer advice to my friend, thanks in advance. XD

[bluebuda]

Re: Samsung DLP LED Color Flickering Issues

Interesting, I considered the DMD but the fact red and green are showing up, or is it blue, LOL, made me second guess that and figure maybe one of the high intensity LED's are going out. I think the driver board is fine because as you said it would not light up at all if it were bad.

Also my friend has two other videos of the TV acting up, one I just saw has a color issue striping through the set.

http://www.youtube.com/watch?v=84j9V...=UL84j9VIZgB4w

This does look more like a DMD or digital board issue, what do you think?

[drpj23]

Re: Samsung DLP LED Color Flickering Issues

Maybe we should do a color test of the three primary colors and then a simple mixture of the two and then all three (white) and watch the characteristics of the screen.

I may digress from saying it is not the driver board since it seems to also control the rapid firing order. If that is off, well the DMD really would have a hard time wouldn't it? It looks like there is EXILINX spartan IC that may be responsible for that. But Im not sure and that could be completely wrong. If you ever get it open, could you post the part number?

To me the LEDs flash in succession to each other (as a color wheel) and is reflected when the color is present. If the firing order got screwed up and green is also flashing when red is (due to whatever reason) then that also could make sense.

[drpj23]

Re: Samsung DLP LED Color Flickering Issues

Where would you buy an LED for this set anyways? I can't find one lol

[bluebuda]

Re: Samsung DLP LED Color Flickering Issues

I was thinking of checking the LED's first to avoided spending money if the problem could be isolated through simple trouble shooting so I think that testing the colors is a great first test even though I suspect you to be correct about the DMD or Digital board.

The time I changed the LED in the DLP before was for a shop, the owner of the shop simply brought me the LED and said install it. LOL XD Then he proceeded to talk about it being the red LED and I simply remember working with him on LCD projections where the red filters would always burn out first, so I'm just guessing on that. LOL

Unfortunately I don't know where to buy the replacement LED's but I'm sure they are available somewhere.

Yes, If I open the set up for my friend I will document the set with high quality photos and post them here on the site, I will also make sure the topic here is resolved for others who might be dealing with this problem if we get it fixed.

Thanks for the feedback and your input! =D

[RON_CET]

Re: Samsung DLP LED Color Flickering Issues

Yes I agree DMD issue attached is the training manual look @ slides 65-72 for DMD,hope this helps

[bluebuda]

Re: Samsung DLP LED Color Flickering Issues

Thanks! I appreciate the help. =D