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Mitsubishi WS55859 HDTV
My Mitsubishi has a series of black dots spaced at regular intervals
running diagonally across the screen and then repeating again on the lower part. A tech that came out said it was burn-in and would not be covered under my warranty. I've seen burn-in on TVs and monitors before and it has never had solid black dots like this, plus I have not ever had any sort of static picture on the screen for any length of time that could have caused burn-in. This reminds me of a RAM chip on a computer display card with a bad column address line. Does my HDTV have a digital frame buffer that could have failed like this? Is there any sort of built-in diagnostic I could access to test it? -- Rick Jones Remove the Extra Dot to e-mail me |
Depends if ya used match or lighta for burn in.
"Rick Jones" wrote in message ... My Mitsubishi has a series of black dots spaced at regular intervals running diagonally across the screen and then repeating again on the lower part. A tech that came out said it was burn-in and would not be covered under my warranty. I've seen burn-in on TVs and monitors before and it has never had solid black dots like this, plus I have not ever had any sort of static picture on the screen for any length of time that could have caused burn-in. This reminds me of a RAM chip on a computer display card with a bad column address line. Does my HDTV have a digital frame buffer that could have failed like this? Is there any sort of built-in diagnostic I could access to test it? -- Rick Jones Remove the Extra Dot to e-mail me |
Rick Jones wrote:
My Mitsubishi has a series of black dots spaced at regular intervals running diagonally across the screen and then repeating again on the lower part. A tech that came out said it was burn-in and would not be covered under my warranty. I've seen burn-in on TVs and monitors before and it has never had solid black dots like this, plus I have not ever had any sort of static picture on the screen for any length of time that could have caused burn-in. This reminds me of a RAM chip on a computer display card with a bad column address line. Does my HDTV have a digital frame buffer that could have failed like this? Is there any sort of built-in diagnostic I could access to test it? HDTV, if it is anything like European TV with double frame rate, will have a RAM buffer. --- Met vriendelijke groet, Maarten Bakker. |
"John Del" wrote in message ... Subject: Mitsubishi WS55859 HDTV From: Rick Jones Date: 11/15/04 10:30 PM Eastern Standard Time Message-id: My Mitsubishi has a series of black dots spaced at regular intervals running diagonally across the screen and then repeating again on the lower part. A tech that came out said it was burn-in and would not be covered under my warranty. Can't be burn in. Burns in CRT based projectors show up on the projected image as colored marks, not black. The burn is a subtracted color. A burn in the green tube will leave a magenta mark, a burn on the red tube leaves a cyan mark, etc. In order for the marks to be black, the three tubes would need to physically occupy the same space (impossible). If all three tubes are burned completely and the convergence is good, you would get EXACTLY a black spot. This is likely not burn in, from the description, however. If it is it is likely from a defect in the set to get a pattern like that burned in. I have a customer with a similar model describing a very similar symptom. It is out of town and I won't see it until Thursday, but I will post what I find. Leonard |
Subject: Mitsubishi WS55859 HDTV
From: "Leonard Caillouet" Date: 11/16/04 8:03 AM Eastern Standard Time Message-id: eXmmd.7792$Dk.2102@lakeread08 If all three tubes are burned completely and the convergence is good, you would get EXACTLY a black spot. The marks that the OP are describing come from circuit failure, unless he was watching that pattern (as Sam suggests is unlikely to say the least). While those type of marks would burn on the same physical area of the CRTs, the actual picture targets are not in the same location on the tubes. The green is pretty much dead center while the red and blue images are off center in opposite directions. For an experiment, disconnect the yokes on an old scrapper projo (jump out any B+ feeds at sockets) and burn three marks in the dead center of each tube. You'll find three colored marks on the screen. The only time I've ever seen black marks is when the burns are large and overlap at some point. |
Can you post an image of this for us to see?
-- ========================== Jeff Stielau Shoreline Electronics Repair 344 East Main Street Clinton,CT 06413 860-399-1861 860-664-3535 (fax) ======================== "If you push something hard enough it will fall over." Fudd's First Law of Opposition - Sir Sidney Fudd "Rick Jones" wrote in message ... My Mitsubishi has a series of black dots spaced at regular intervals running diagonally across the screen and then repeating again on the lower part. A tech that came out said it was burn-in and would not be covered under my warranty. I've seen burn-in on TVs and monitors before and it has never had solid black dots like this, plus I have not ever had any sort of static picture on the screen for any length of time that could have caused burn-in. This reminds me of a RAM chip on a computer display card with a bad column address line. Does my HDTV have a digital frame buffer that could have failed like this? Is there any sort of built-in diagnostic I could access to test it? -- Rick Jones Remove the Extra Dot to e-mail me |
Shoreline Electronics wrote:
Can you post an image of this for us to see? Are binaries allowed here or do I need to put it on a web page? -- Rick Jones Remove the Extra Dot to e-mail me How come we choose from just two people for President and fifty for Miss America? |
Web page
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Can you imagine John Kerry or George W in a bikini?? Yukkers A Strong
Third party may even be welcome!! "Rick Jones" wrote in message ... Shoreline Electronics wrote: Can you post an image of this for us to see? Are binaries allowed here or do I need to put it on a web page? -- Rick Jones Remove the Extra Dot to e-mail me How come we choose from just two people for President and fifty for Miss America? |
Shoreline Electronics wrote:
Can you post an image of this for us to see? I've placed a photo of the screen showing the dots at: http://www.geocities.com/seventysixi.../PB230070a.JPG Ignore the orange spot in the upper left corner, it's just a reflection from the overhead light. I do not see how the technician could call this burnin. I have never seen burnin on a TV or monitor like this. The regular, repeating pattern looks like a failure of some memory segments, if I understand correctly how the electronics of this TV works. Unfortunately, since it's been diagnosed as burnin by the tech that came to look at it my extended service provider is claiming repair isn't covered under my warranty. -- Rick Jones Remove the Extra Dot to e-mail me "The great object is that every man be armed... Everyone who is able may have a gun." -Patrick Henry |
Subject: Mitsubishi WS55859 HDTV
From: Rick Jones Date: 11/24/04 9:56 AM Eastern Standard Time Message-id: I've placed a photo of the screen showing the dots at: http://www.geocities.com/seventysixi.../PB230070a.JPG Ignore the orange spot in the upper left corner, it's just a reflection from the overhead light. I do not see how the technician could call this burnin. I don't know of any pattern you could have been watching that would cause a burn pattern like this. Did the technicial look directly into the tubes when turned off? Shining a bright light (sharply focused LED lights are great for this) directly into the lens assy of each tube would quickly confirm any burns on the faceplate of the CRTs. If he didn't, he didn't do his job. Besides, just because a tube is burned (and I don't believe yours are), doesn't place the blame on the consumer necessarily. Burns also happen when there are failures of the chassis (or an individual tube). Such burns are still covered by warranty. Of course, pattern burns from games, test patterns, station logos, phone numbers, stock tickers, etc. are not warranty compensable. Get a hold of Mitsu and scream until something gets done. Even if you need to pay a non-authorized independant tech to disassemble and confirm the tube conditions, it would be well worth it. John |
John Del wrote:
Subject: Mitsubishi WS55859 HDTV From: Rick Jones I've placed a photo of the screen showing the dots at: http://www.geocities.com/seventysixi.../PB230070a.JPG Ignore the orange spot in the upper left corner, it's just a reflection from the overhead light. I do not see how the technician could call this burnin. I don't know of any pattern you could have been watching that would cause a burn pattern like this. Get a hold of Mitsu and scream until something gets done. Even if you need to pay a non-authorized independant tech to disassemble and confirm the tube conditions, it would be well worth it. Well, I may actually get something resolved on this, after having to live with this ugly problem for the past year. I had a tech come out last week while I was on vacation for the annual cleaning I'm allowed under my extended warranty. This time the Phillips people (whom the extended warranty is through) used a different service provider. This tech took a more thorough look at things than the guy a year ago and pretty much proved it isn't burnin. Going into the convergence controls and moving the 3 color positions widely apart showed that the spots move with the signal, whereas if it was really burnin on the tubes they would have stayed put. I also noted, for the very first time, that when the TV's menu is displayed (not the satellite guide) the dots don't appear on the menu but can still be seen on the rest of the picture. The menu display overlays the dots. So the problem seems to be somewhere in the signal processing. He's gotta check with Mitsubishi on the possible causes, and get Phillips to reauthorize repair after the previous techs screwup, but hopefully it's going to get fixed soon. -- Rick Jones Remove the Extra Dot to e-mail me Generally speaking, you aren't learning much when your lips are moving. |
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