Official LaserVue Owners thread - Page 90 - AVS Forum
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post #2671 of 2680 Old 06-10-2014, 02:49 PM
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Originally Posted by jpetrol251 View Post

so my a91 now has some issues with dots that come and go. I called mits and after putting up a fight they agreed to fix for free (parts and labor). But they want me to sign a release. CONFIDENTIAL SETTLEMENT AND R E L E A S E. The tv is over 2 years old. I brought up the buybacks and they said No. Any advise?
Any idea if the repair is expensive or not? If not, I'd tell them to stick that document where the sun doesn't shine. If it is expensive, I still might tell them to do that. If you sign the document, where does that leave you if the repair doesn't work? On the one hand, it's nice that they're agreeing to fix something that's out of warranty, but on the other hand it's the right thing to do (except for the signing your life away part).

Not that it's a factor at this time because they don't currently sell anything I want, but I can't see myself every buying a Mitsubishi product again seeing how they've been handling these issues.
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post #2672 of 2680 Old 06-10-2014, 03:10 PM
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Luck for you the problem appears (from your brief description) to be the DMD chip at the heart of the DLP engine. As such it is no different than what many Mits DLP owners have done...either have a tech do the repair, or do it themselves. Most importantly, the appropriate Texas Instrument DMD chip is available, as opposed to the very difficult to find Mits lasers.

You'll need to search some of those threads and posts, but even if you have a tech do it, it's much less than cashing out the TV, or signing away your rights. On the other hand, what are they asking you for other than confidentiality (which appears moot at this poin).

In your case the problem appears to be the tiny mirromirred DMD chip which modulates the light projected by the lasers.

By the way, Mits is returning to TV with a UHD flat panel LCD, which uses a red lase rather than the standard red (filtered) LED for illumination
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post #2673 of 2680 Old 06-10-2014, 03:17 PM
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Quote:
Originally Posted by jpetrol251 View Post

so my a91 now has some issues with dots that come and go. I called mits and after putting up a fight they agreed to fix for free (parts and labor). But they want me to sign a release. CONFIDENTIAL SETTLEMENT AND R E L E A S E. The tv is over 2 years old. I brought up the buybacks and they said No. Any advise?

Oh, I did want to also mention that I seem to recall the 'dots' that come and go is a failing DLP chip, not lasers. That's a part that a lot of people have ordered cheap on their own and replaced.
Anyone able to comment on this? I'm too lazy to search the thread.

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post #2674 of 2680 Old 06-10-2014, 04:05 PM
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See above post.

The dots are caused by the degradation of the micromirror structure and movements that produce the DLP effect. Each pixel of picture is projected by an independently moving micromirror that moves on a hinge structure.

Due to the deforming effect of heat on the hinge structure, and possibly the build up of electrical charges from continually being made to move by electrical charges, the mirrors become biased, and even frozen in place. The light dot is a mirror always projecting light onto the screen, and the dark dot is a mirror that is swung so that it cannot reflect light.
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post #2675 of 2680 Old 06-10-2014, 04:21 PM
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Oh, I did want to also mention that I seem to recall the 'dots' that come and go is a failing DLP chip, not lasers. That's a part that a lot of people have ordered cheap on their own and replaced.
Anyone able to comment on this? I'm too lazy to search the thread.
Here you go. I'm prepared for that day just in case. http://www.avsforum.com/t/1475141/how-to-replace-the-laservue-l75-a91-ti-1910-6143w-chip
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post #2676 of 2680 Old 06-27-2014, 12:12 AM
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Arc?

Finally getting around to replacing my really old AV receiver.
Checking out possible wiring options, I discovered HDMI ARC (Audio Return Channel) and though 'cool'.

I can find no mention of it. Did Mitsubishi really skimp on this and give these TVs only 1 possible digital output line (coxial) or is ARC just undocumented?

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post #2677 of 2680 Old 06-27-2014, 02:38 AM
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Originally Posted by DoctorM View Post
Finally getting around to replacing my really old AV receiver.
Checking out possible wiring options, I discovered HDMI ARC (Audio Return Channel) and though 'cool'.

I can find no mention of it. Did Mitsubishi really skimp on this and give these TVs only 1 possible digital output line (coxial) or is ARC just undocumented?
Other than eliminating a cable, there's absolutely no advantage to ARC as it doesn't support the high res audio formats such as Dolby True HD or DTS HD Master Audio. So I honestly wouldn't worry about it.
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post #2678 of 2680 Old 06-27-2014, 10:05 AM
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It just sort of sucks that if you use the Laservue for tuning your TV, there is only one digital output and it's coaxial.

Btw, talking to someone at Best Buy yesterday, they said they have Geek Squad (not the regular GS guys, but specialists) who do come out and blow out dust from rear projection TVs.

I didn't ask if that is included in the extended warranty or an extra cost, but since I've yet to figure out how to actually life/move/relocate the TV to clean it out, it'll probably be worth it.

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post #2679 of 2680 Old 06-28-2014, 11:57 AM
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Originally Posted by DoctorM View Post
It just sort of sucks that if you use the Laservue for tuning your TV, there is only one digital output and it's coaxial.

Btw, talking to someone at Best Buy yesterday, they said they have Geek Squad (not the regular GS guys, but specialists) who do come out and blow out dust from rear projection TVs.

I didn't ask if that is included in the extended warranty or an extra cost, but since I've yet to figure out how to actually life/move/relocate the TV to clean it out, it'll probably be worth it.
I'd be careful, in that a lot of people (including Geek Squad) don't know how to clean the lenses of a rear projector. People immediately think microfiber, but that is not a great solution. Mr. Bob, on the Don't Dump Your CRT RPTV has some good info, which would apply to all lenses in all RPTVs.

The coatings on these lenses have to be treated in the proper way, as your image, in the last analysis, is projected through these lenses.

And I'd be careful around the DLP light engine as well. I'd ask these techs precisely what they would do during cleaning.
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post #2680 of 2680 Old 06-28-2014, 12:47 PM
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Originally Posted by taichi4 View Post
I'd be careful, in that a lot of people (including Geek Squad) don't know how to clean the lenses of a rear projector. People immediately think microfiber, but that is not a great solution. Mr. Bob, on the Don't Dump Your CRT RPTV has some good info, which would apply to all lenses in all RPTVs.

The coatings on these lenses have to be treated in the proper way, as your image, in the last analysis, is projected through these lenses.

And I'd be careful around the DLP light engine as well. I'd ask these techs precisely what they would do during cleaning.
Good note. I was more of the mindset that if I did it myself and messed it up, or hired some other repair shop to do it (and they messed it up) I could be SOL. If Best Buy messes it up, they hold the extended warranty so I'd probably be able to twist their noses for a 4K or OLED replacement.

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