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Samsung DLP strobing (aka flickering)

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Old 02-11-2010, 01:19 PM   #1
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Default Samsung DLP strobing (aka flickering)

I have a Samsung DLP model HNL5065WX/XAA that is having serious problems with strobing. After about 1 hour of use, the picture flickers. I believe some refer to this as "strobing". There is no sound associated with the problem (ruling out color wheel i think). The same picture problem occurs with coax cable input, S-video input, or DVI input. The flickering image also affects the color of the menu display as well. I believe the only two possible suspects are the DMD or digital board. I have two videos posted showing the problem...

http://picasaweb.google.com/andyzig/TVProblems_1#

I dare not try to embed because i'm sure i will have problems. If anyone know exactly what my problem is, i'd love to hear the answer.
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Old 02-11-2010, 02:48 PM   #2
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Can't say exactly but it could be a color wheel even without noise. Best way to check that is remove the bulb and it's assembly and look behind it and see if the color wheel is missing any glass segments. If it is, thats the problem.

DMD board failure is usually a static group of lines or patterns not a pulsating thing like you have. The flicker is almost always either the bulb going out or the color wheel.
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Old 02-12-2010, 01:33 PM   #3
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I agree about the color wheel.

I would look at the color wheel and if not that then a video processing board as the cause as I thought I saw some artifacts mixed in with that flickering. I doubt it is the lamp though as only part of the screen seems to flicker at a time and not the whole screen equally.
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Old 02-15-2010, 05:39 PM   #4
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Thanks for the help. I'm glad to hear that you guys don't think it's DMD board, that is very encouraging. I don't understand how the problem could be related to the color wheel?? The TV works fine for about 1 hour. In fact, I am currently typing this message using the TV and everything looks perfectly normal. If the problem were a missing glass segment, then the problem should always exist, correct? Because the problem consistantly occurs after about 1 hour of use, i would assume that it were heat related. Actually, that reminds me, i will place a small window fan behind the TV right now and see if i cant get more than 1 hour of use before the flickering begins. fingers crossed. Any opinions?
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Old 02-15-2010, 05:48 PM   #5
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Let me be more specific. The TV is 100% normal for roughly 1 hour. After that time, small flickering occurs, almost not noticable if you aren't looking for it. This lasts for 5-10 minutes and slowly gets worse. After 15 minutes the flickering is horrible. At that point i turn the TV off with frustration. After 15-20 mins we turn the TV on again and it will work for another 15-20 minutes before flickering returns once again. After that point i give up and go to sleep. The pattern is indectical each night.
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Old 02-15-2010, 06:02 PM   #6
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Have you ever replaced the bulb? It could be starting to fail and gets worse as it gets hotter. You can see the bulb light in the back of the tv thru the screen in front of it. When it starts to flicker, look at the back of the tv and see if the bulb is flickering.
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Old 02-16-2010, 07:30 AM   #7
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When i was looking in the back of the TV while the flickering was occurring, i could hear a buzz. The sound is faint but definitely only audible while the flickering is happening. I suppose Iím leaning towards a color wheel problem now. Is it possible to run the TV without the color wheel to verify that problem is definitely a color wheel bearing issue?
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Old 02-16-2010, 09:12 AM   #8
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No, you need the color wheel operative to get the tv to turn on.
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Old 02-16-2010, 09:19 AM   #9
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what is the "operative". Can i remove the wheel and bearing but leave everything else so it thinks the wheel is in there? Is there anyway to trick the TV into thinking it's there?
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Old 02-16-2010, 09:24 AM   #10
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You are so concerned about a positive answer to what it is, you should get a repair person in and have him check the various parts, that's the only way you can be 100% sure. Me suggesting things (tho probably correct) from thousands of miles away is just my guess. You could have more than one thing going wrong.

If you want a positive answer, you are going to have to call a repair shop and pay the service fee.

Last edited by clearday; 02-16-2010 at 09:29 AM.
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Old 02-16-2010, 12:19 PM   #11
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I'm looking for a logical approach to my troubleshooting technique before beginning to tear the TV apart. I'm not spending $100 on a color wheel just based on a hunch. I need a means of identify the problem. For example, removing the wheel and seeing if the problem goes away would be one such approach. I'd rather throw the TV in the trash than waste $100 and find out it's not the color wheel.

Last edited by albany; 02-16-2010 at 12:47 PM.
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Old 03-01-2010, 07:54 AM   #12
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Default Same Problem

I am experiencing the same "flickering" and hope you can share your resolution. Mine came about differently though. I just replaced the bulb/enclosure after 15k hours. After a few hours, the flickering began and got worse with time. Now it takes about 30 minutes. I put the old bulb/enclosure back in and the problem still exists. It's hard to screw up installing a new bulb but apparently something happened. Any suggestions would be appreciated.
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Old 03-01-2010, 08:35 AM   #13
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Albany,

I have the exact same problem as you. Your videos and description was like I was watching my tv one hour after turning it on.

Have you made any progress with what the problem is? I have had the bulbs and color wheel replaced before. When my color wheel went, it was loud and the tv would shut itself off. thats why I think this is a fan/cooling problem.

Please advise?

Glen
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Old 03-01-2010, 09:12 AM   #14
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Because the problem is clearly heat related i placed a small window fan behind the TV to pull more air through (PULL, don't push air in and fight the fan already in there). I don't know how many fans are in this TV, but i can see at least one spinning when i look in the back of the TV. Anyway, with the additional window fan i was able to run the TV for over 8 straight hours without a problem. I have yet to see the problem return with the window fan providing additional cooling flow. I'm busy with other things right now, so this is good enough for me. I have a working TV without spending $$$. I would like to really fix the problem eventually, but there are so many problems with these samsung DLP's, i dare not invest much into this money pit.

Now, the real question: Is the heat a primary problem or a secondary effect? Do i have fan problems or is there another component going bad creating excess heat? I would assume that the bulb is the primary heat source in the TV, correct? Is there anything else that produces as much heat as a bulb? My bulb is original, so my next move would be to replace the bulb, however it sounds like that might not help at all based on sandmanAlbany's experience.
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Old 03-02-2010, 07:06 AM   #15
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Thanks Albany, the window fan trick does eliminate the flickering. But as you said, the problem still exists. This leads me to believe that a smaller secondary fan is not operating internally. Does anyone know if the color wheel has a small fan or cooling mechanism? This could be why others have said replacing the color wheel resolved their problem.
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