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Samsung DLP strobing (aka flickering)

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Old 03-23-2010, 04:29 PM   #16
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Hey Albany


I have the EXACT same problem. I will let you know in a few days when my color wheel and lamp come in.

I'd say that it's a combination of things. CW and LAMP. If it gets to hot, I mean really hot, then the unit wold turn itself off, simply.

Right now I have the back of the tv off and it still flickers, the tv and the lamp, as I'm watching. Just like yours.
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Old 03-25-2010, 08:54 PM   #17
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Default Flickering Picture

Hi, Your video looks exactly the same as the problem I had with my Mitsubishi. My problem was the color wheel, or more specifically, the optical sensor that reads the rotation of the color wheel. After about 1 hour of use, the set would flicker. The mitsubishi color wheel is in a well with a cover on top. You can remove the cover, and see the wheel in operation. I don't know if yours is like that. I knew it was a thermal issue, so I scoped the signal off the sensor. When the flickering started, the signal went nuts. I then lifted the cover off the color wheel, and carefully shot the sensor with component cooler. The picture immediately went back to normal. As a matter of fact, just leaving the cover off (which I don't recommend doing), cooled the area enough to keep the sensor from failing. I was able to determine which sensor was used, and sourced a replacement. My set is now trouble free. Now I know your set is not a Mitsu, but I bet they're using a similar sensor. These sensors were used in VCRs, and were a high failure item there. If you decide to work in there, be careful, and don't damage the color wheel. I worked with my whole chassis on the bench. It was much easier.
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Old 07-23-2010, 09:10 PM   #18
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Add me to the Samsung flickering club.

Mine started about 2 weeks after I changed the bulb. I was very careful to use an 'official' bulb and not one of those 'this also works' bulbs from another company.

As with all fan cooled electronics there was a boatload of dust that had accumulated over the years. I'm quite at home around sensitive electronics and carefully cleaned out the dust as best I could without removing too many parts before putting in the new bulb.

Then the flickering started at random. It was only noticable on Directv's channel guide and would usually stop when I selected a show.

I found this site through google and there are a few more sites about this, but they all seem to have stopped around Feb/March. I have yet to see anyone post the solution they found, if any.
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Old 07-24-2010, 06:48 AM   #19
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Default Samsung dlp

MY Samsung dlp is a 46 in and I have had trouble also in the past.

I started a preventative maintenance and now less less problems.
My first bulb lasted for 18k hours, and I am on my second now and it has to be over 10k. Luckily at the present time I have zero issues.

I pull the bulb and enclosure out about every 3 to 6 months. Using
a small artist paint brush I dust off the fan which was behind the bulb
enclosure. Once dusted off as good as I can get, I then use a small
vacuum to get the dust out. Never use compressed air, as it can leave small dust particles all over your mirrors.

I also put a small piece of electrical tape around the small sw that
is near the dmd board, as it tends to not quite close like it should
causing the tv to act up and relate similar to a bad bulb, when in
fact the bulb is fine.

This relieved most of my issues. I want a new led Samsung but
the wife won't let me as long as this dlp is working good. This is
my biggest problem.
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Old 10-23-2011, 03:09 PM   #20
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Red face Samsung DLP Flickering screen

Many thanks for the mentions on how to fix.... led me to this:
No service available - 125 miles - removed bulb (it is new) like 4 days old... used flash lite to see all the dust lint build up in fan behind the bulb... and the other fan ( 2.5") on spring loaded mount.
worked for about 30 min... 7 yrs old so guess it about time for a new one ... not noisy - so any other idea - Thanks
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Old 10-23-2011, 11:56 PM   #21
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I just had a great price on a samsung pn51d7000 plasma and although I didn't SEE any of this I am guessing my horrible eye problems with the tv are due to strobing I just couldn't see was there. I lvoed the picture so much and had to return it and even pay hundreds to return it all because of that crap. I can't find anyone to help me figure out what type of tv I can get and be free of thsoe eye issues with. It's happened on that plasma as well as a couple leds. Doesn't happen on a CCFL set I have.
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Old 04-26-2012, 10:26 AM   #22
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Default same problem with Samsung DLP HLN-567W

Okay folks this forum helped me resolve the flashing or strobing issue I was having with my Samsung DLP HLN-567W so I am doing my civic duty in posting here for the googlers of the world.

Mine started flashing after a few hours of being on and it started only doing it on bright images. The time got shorter and shorter down to like 20 minutes. It continued the thing of only flashing on bright images but then would get worse to flash on darker and darker images.

I had a TV repair guy that wanted to replace some of the capacitors on the digital board board. Was very uneasy that was the issue. Particularly when I placed some 80mm fans right above the exhaust fan and blew them inward. Essentially this would blow cool air behind the bulb that then was getting sucked in by the exhaust fan. Doing this, the TV would last a lot longer before it started flashing.

Based on that, combined with what I found here in this forum, and based on a response from one of the posters here that I emailed (thanks Pete!) I determined that it had to be the color wheel. So I bought one for $80 off Ebay, replaced it, using a great YouTube video to help me. The video I used concerned a HLM-507 color wheel replacement but all the steps were almost exactly the same.

I really thought the color wheel should have lasted longer, as just 4.5 years ago I had the dreaded white dots issue that caused a complete light engine replacement...fortunately I was under an extended warranty transferred to me by the first owner. Maybe 4.5 years is good for a color wheel? Was interesting to me that the installer of that defective color wheel left a nice big ole fingerprint on it.

So there ya go, civic duty complete. Feel free to email me to let me know if this helped you. My email is my highdefforum screen name on gmail.

Kevin
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Old 02-20-2013, 01:28 PM   #23
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I have a Samsung 46 inch tv that had the strobing problem. I found this fix online and video on how to do it on you tube which you can search this for yourself. It's not hard to find. I had to take back off tv and cut jumper 852 on power supply board. Believe it or not this fixed the problem and tv works fine. I thought what the heck, i was going to have to buy a new board anyway but this simple fix cured the problem. Saved me some money. Hope others can use this for themselves. It really works.
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Old 12-19-2014, 10:08 PM   #24
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i just put it on high altitude to run the fans high and that seemed to work so far their is also a service mode on thease that is nice to know about
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Old 12-22-2014, 07:10 PM   #25
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Quote:
Originally Posted by kevproductions View Post
i just put it on high altitude to run the fans high and that seemed to work so far their is also a service mode on thease that is nice to know about
2 days after writing this high altitude no longer helps the flickering, I might add to help identify what the exact cause of this malfunction is. that a few days before this started happening the colors were out of whack( the colors looked like if you put a photo into 16 colors on a computer) with some digging on the internet I learned about service mode and I changed the color index and that fixed it, maybe it is just the color wheel, I have a optima projector with the same problem described but it only has like 1300 hours on it
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Old 01-06-2015, 10:40 PM   #26
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Quote:
Originally Posted by kevproductions View Post
2 days after writing this high altitude no longer helps the flickering, I might add to help identify what the exact cause of this malfunction is. that a few days before this started happening the colors were out of whack( the colors looked like if you put a photo into 16 colors on a computer) with some digging on the internet I learned about service mode and I changed the color index and that fixed it, maybe it is just the color wheel, I have a optima projector with the same problem described but it only has like 1300 hours on it
SOLVED !!!

a couple days after writing this the projector shut off and would not turn on it said the lamp failed

i ended up buying a new lamp with no results, the projector still said lamp fail i found a different thread about that and it worked!!!

a 5 dollar can of spray duster and about an hour of work(carefully disassembling and dusting the main board then reassembling) and all the problems are solved (strobing picture, lamp fail, and color indexing) by the way the original lamp is still good

it turns out that dust on the main board makes it go crazy all i did was take the top off disconnected the ribbon get a vacuum to try to catch the dust while you spay the duster i needed my wifes help to operate the trigger on the duster can because i modified it to have a long flexible hose (you will probably have to make something similar because you cant turn the can upside down) mine was about 2.5 feet of aquarium tube the straw from the air duster cut in half and fittings to make a air tight connection between the two straw half's at each end of the aquarium tubing(my fittings were the aquarium tees the straw fit perfectly in them i had to plug the 3rd hole but thats all wall-mart had)

put it back together and i workes it has been working fine for about 2 weeks now not one problem with flickering

this it the thread that solved this problem for me
it will not let me post urls so google this

FOR ANYONE WHO'S PROJECTOR IS GOING CRAZY!!! (flickering, lamp light coming on etc)
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Old 01-17-2015, 11:09 AM   #27
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I haven't tried it yet, but I imagine dust accounts for a lot. That's what happened to my HP Printer scanners, but I didn't bother and bought new ones. I have had the bulb replaced a few years ago in my Samsung 62" DLP when it started flashing the lamp light and turning itself off. My son put a bulb in but it still had problems. The repairman said Samsungs had some little thing on the mirror that always broke and he glued it or something. I'm afraid I've forgotten. It worked anyway. Now when I first turn it on it flashes and looks like a screen is over it. If I unplug it and replug it once or twice it usually clears up. But recently the flashing screened look has happened a few times when changing channels or after a few minutes of being clear when first turned on. I found this, but I'm afraid to try it with such a big TV and I'm a skinny woman, lol. Maybe I can get my son to help. He put the bulb in for me. Google youtube "How to fix your DLP TV by simply cleaning it?" Hope this helps someone.

Last edited by hipoe; 01-17-2015 at 11:12 AM.
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Old 01-31-2015, 10:57 AM   #28
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Default cheap replacement bulb was causing strobing/flickering

Thanks to everyone on this post with their ideas. I solved my Samsung DLP strobing problem recently. My strobing issue started when I replaced the bulb with a cheap "equivalent" bulb. Strobing started within a few hours of installing the bulb. Progressively got worse over the next few days and weeks. I took the light engine out, cleaned out all the circuit board and fan dust. Reassembled. No difference. Decided to purchase a genuine Phillips bulb. Installed it this morning. Strobing is gone. Picture has never been better. Very bright and flicker free. My theory is there was a mismatch between the ballast and the bulb. The flickering would come and go depending on the how hot the ballast would get during operation. My recommendation is to figure out which bulb goes with your ballast and get that bulb. One way to figure this out is to go into the "mute 1-8-2" service mode, and see which bulb is listed there. Mine said "Phillips". Get that bulb. Very hard to determine online if you're getting a true Phillips bulb. I used Discount-Merchant online. The cheaper bulb that caused the strobing was from one of the vendors on Amazon.
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