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post #2671 of 2688 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 2688 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 2688 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 2688 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 2688 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 2688 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 2688 Old 06-27-2014, 02:38 AM
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Quote:
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 2688 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 2688 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 2688 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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post #2681 of 2688 Old 08-01-2014, 08:46 PM
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Originally Posted by jasonmichaelh View Post
Find the service manual and do it yourself. It definitely looks like the top mirror might be out of whack. Vertical adjustment can be made in the service menu.

If you are the second owner of the tv I doubt Mits will buy it back from you, unless maybe you are in a state that exempts you from the non-transferable warranty clause. It sounds like you are on AZ like me, so that wouldn't apply.

Walts might be able to help you, but they did a horrible job of servicing my LV.

Jason, let me make the long story short.

I paid guy I bought the TV from, $300.00 + $50.00 to his cousin, to deliver it to Waltz...
I then paid Walts $50.00 to "look" at it. By the time the TV powered on, the curves were a profound hour glass.
Walts quoted me $1200.00 to fix the Laser Assembly. I told them "No, give me some time to find an alternative".
I have found a laser engine assembly for the 91 series, on ebay, for $350.00
Should I buy that unit and try to fix it myself.
No, I am not a soldering time person... but I am an IT specialist. I have been known to take apart laptops and fix those with my A+ certification intuition.
Would that be enough?
Lol... would YOU be interested in a project, since you live in these parts of Arizona, like myself...

I am going to call some other TV shops to see how much the would charge me...
Its been over a month, and Walts is now calling me to come pick the TV up...
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post #2682 of 2688 Old 08-02-2014, 09:41 AM
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Jason, let me make the long story short.

I paid guy I bought the TV from, $300.00 + $50.00 to his cousin, to deliver it to Waltz...
I then paid Walts $50.00 to "look" at it. By the time the TV powered on, the curves were a profound hour glass.
Walts quoted me $1200.00 to fix the Laser Assembly. I told them "No, give me some time to find an alternative".
I have found a laser engine assembly for the 91 series, on ebay, for $350.00
Should I buy that unit and try to fix it myself.
No, I am not a soldering time person... but I am an IT specialist. I have been known to take apart laptops and fix those with my A+ certification intuition.
Would that be enough?
Lol... would YOU be interested in a project, since you live in these parts of Arizona, like myself...

I am going to call some other TV shops to see how much the would charge me...
Its been over a month, and Walts is now calling me to come pick the TV up...
If this is the part on ebay that you are referencing (the price is the same as what you mentioned), please be aware that this unit does not include the laser assembly. The part listed on ebay, # 870B010001, is the Optical Engine Assembly. It contains the Digital Micromirror Display (DMD) chip, lens and mirrors. The lasers for the L75-A91 are in the Light Source Assembly, # 870B009001, which listed for $2,497.30 from the Mitsubishi parts department. However, they haven't had this part since March of last year and I know of none available in the secondary market.
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post #2683 of 2688 Old 08-02-2014, 11:59 AM
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Originally Posted by jasonmichaelh View Post
Find the service manual and do it yourself. It definitely looks like the top mirror might be out of whack. Vertical adjustment can be made in the service menu.

If you are the second owner of the tv I doubt Mits will buy it back from you, unless maybe you are in a state that exempts you from the non-transferable warranty clause. It sounds like you are on AZ like me, so that wouldn't apply.

Walts might be able to help you, but they did a horrible job of servicing my LV.
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Originally Posted by RU Geekman View Post
If this is the part on ebay that you are referencing (the price is the same as what you mentioned), please be aware that this unit does not include the laser assembly. The part listed on ebay, # 870B010001, is the Optical Engine Assembly. It contains the Digital Micromirror Display (DMD) chip, lens and mirrors. The lasers for the L75-A91 are in the Light Source Assembly, # 870B009001, which listed for $2,497.30 from the Mitsubishi parts department. However, they haven't had this part since March of last year and I know of none available in the secondary market.
RU Geekman, they (Walts) said that that part, and not the laser assembly, were the only things that needed to be repaired..
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post #2684 of 2688 Old 08-02-2014, 04:00 PM
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You had used the term "laser assembly," so I wasn't sure if you knew that the lasers and the main optical components are in different assemblies.This thread will show you how to change out these parts. Just follow the instructions for removing the Optical Engine Assembly (the formal name for this unit is "ASSY-ENGINE"), part number 870B010001, and replace it with the unit that you purchase on ebay. Just note that in the instructions in that thread, only the DMD chip is being replaced, not the entire assembly (which contains the chip in a sub-assembly). I know of no way to obtain only the focusing mirrors, apart from getting them already installed in the ASSY ENGINE. Nor would you want to try, as it would be almost impossible to align them correctly outside of the factory. PM me with your e-mail address and I will be happy to send you the service manual.
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post #2685 of 2688 Old 08-07-2014, 11:56 AM
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Hello All,

This is a continuation of a number of posts I started back in early June 14

To sum up, the subject was "overheating" I disassembled the back cover and vacuumed the exhaust fan heat sink of a solid layer of dust/pollen/cat hair. And that seemed to be the answer. Called off the ext. Wty effort. But then it overheated again. wt?
Summer continues, but its been a cool one. my wife kept saying the breakeven point was 75Deg. any higher and the unit would shut down with the os display of ".. too hot...blocked air vent". So its not that heat sink/fan.
It must not be the DLP the tv works fine -- until it shuts down.

I'd always felt the denon receiver had _something_ to do with it, ignorant yes, but I thought the Mits had some sort of "wifi" ability and the Denon was confusing the Mits circuitry (a number of the mits shutdowns occurred when the denon was powered on). The denon is close by (a big hint, keep reading)

Haven't used the denon in weeks and as i said a cool summer _and_ my wife likes airconditioning in Greenland -- so the room has pretty much been under 75 all the time.

Well Lon'Bhold the danged Mits shutoff lastnight. Temp? 73 deg. (dog cocks head: eeruuuh?) We'd practically forgotten about the issue. Then i notice the denon is on. How long? Wasn't me - hadn't used it in weeks.
Finally a forehead slap: put my hand on the wood cabinet the mits sits on and directly underwhich is the denon -- its pretty warm -- much warmer than the other side of the cabinet top. Reach under the cabinet to above the Denon and hmmm that does seem toasty. I haven't yet moved the denon or adjusted the cooling in the denon area but finally I feel like a clear cause and effect. and yes the denon does seem to interact with the Mits but not vicariously, quite physically.
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post #2686 of 2688 Old 08-15-2014, 06:30 PM
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Hello All,

This is a continuation of a number of posts I started back in early June 14

To sum up, the subject was "overheating" I disassembled the back cover and vacuumed the exhaust fan heat sink of a solid layer of dust/pollen/cat hair. And that seemed to be the answer. Called off the ext. Wty effort. But then it overheated again. wt?
Summer continues, but its been a cool one. my wife kept saying the breakeven point was 75Deg. any higher and the unit would shut down with the os display of ".. too hot...blocked air vent". So its not that heat sink/fan.
It must not be the DLP the tv works fine -- until it shuts down.

I'd always felt the denon receiver had _something_ to do with it, ignorant yes, but I thought the Mits had some sort of "wifi" ability and the Denon was confusing the Mits circuitry (a number of the mits shutdowns occurred when the denon was powered on). The denon is close by (a big hint, keep reading)

Haven't used the denon in weeks and as i said a cool summer _and_ my wife likes airconditioning in Greenland -- so the room has pretty much been under 75 all the time.

Well Lon'Bhold the danged Mits shutoff lastnight. Temp? 73 deg. (dog cocks head: eeruuuh?) We'd practically forgotten about the issue. Then i notice the denon is on. How long? Wasn't me - hadn't used it in weeks.
Finally a forehead slap: put my hand on the wood cabinet the mits sits on and directly underwhich is the denon -- its pretty warm -- much warmer than the other side of the cabinet top. Reach under the cabinet to above the Denon and hmmm that does seem toasty. I haven't yet moved the denon or adjusted the cooling in the denon area but finally I feel like a clear cause and effect. and yes the denon does seem to interact with the Mits but not vicariously, quite physically.




Quick question to you or any of the other watchers...and readers.
How does the picture on some of these Laservue's compare to say the 6000, 7000, and 8000 series of the Samsung LED's or perhaps the Panasonic Plasma's?
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post #2687 of 2688 Old 08-16-2014, 09:15 AM
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L75 A91 light engine fail.

I have a 2011 Laser TV purchased by One Call and I purchased the 3 year it expired on July, 11 2014 my TV broke on July 22, 2014. Well, that's another issue. However, that being said I have had a issue with picture brightness and a mild darkling and then getting bright and a mild color flicker as well. I am not getting any error code and no other issues. The picture still at times looks great but, is getting slightly worse. I called a technician (he was 3 hours away). Also, good luck finding a TV repair man who has any knowledge on how these TV's work. I live in central Md. So, if anyone needs to vent or just ask a question let me know. When the technician stated he could try a software update (if he could even find the software). I will say Mitsubishi said they would help me in my endeavor. I feel, as well as the technician feels that, the TV is totaled. I must say I am terribly disappointed because, this TV was beautiful. I have 10,073 hours on this unit. I babied this thing never moved it always kept it clean not a scratch. I must say I am truly devastated. No TV and the NFL season is here. I am already in debt and can't afford a $2,000 purchase. At this point I have no choice. Screw it, I need my Tv. I am not sure what I am asking for other than the fact that if your reading this you are not alone. Take comfort in the fact that others are suffering along with you. If anyone has the software update or light engine let me know. I hear you laughing loudly at me. If your laughing you realize I will never find it. Thanks to all.
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post #2688 of 2688 Old 08-17-2014, 04:26 PM
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I have a 2011 Laser TV purchased by One Call and I purchased the 3 year it expired on July, 11 2014 my TV broke on July 22, 2014. Well, that's another issue. However, that being said I have had a issue with picture brightness and a mild darkling and then getting bright and a mild color flicker as well. I am not getting any error code and no other issues. The picture still at times looks great but, is getting slightly worse. I called a technician (he was 3 hours away). Also, good luck finding a TV repair man who has any knowledge on how these TV's work. I live in central Md. So, if anyone needs to vent or just ask a question let me know. When the technician stated he could try a software update (if he could even find the software). I will say Mitsubishi said they would help me in my endeavor. I feel, as well as the technician feels that, the TV is totaled. I must say I am terribly disappointed because, this TV was beautiful. I have 10,073 hours on this unit. I babied this thing never moved it always kept it clean not a scratch. I must say I am truly devastated. No TV and the NFL season is here. I am already in debt and can't afford a $2,000 purchase. At this point I have no choice. Screw it, I need my Tv. I am not sure what I am asking for other than the fact that if your reading this you are not alone. Take comfort in the fact that others are suffering along with you. If anyone has the software update or light engine let me know. I hear you laughing loudly at me. If your laughing you realize I will never find it. Thanks to all.
You Can download the latest, and afaik only, update from here. http://mitsubishi-tv.com/support/documents/L75-A91
As for the light engine, good luck. Let us know what fixes the slight dimming and colour flickering.

EJ
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