The NAD T775/T785 AVRs w/ HDMI 1.3 Thread! - Page 157 - AVS Forum | Home Theater Discussions And Reviews
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post #4681 of 4714 Old 12-23-2018, 09:43 PM
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My T775HD has developed distortion on the right surround channel. Yikes.

I am using my T775HD in a 5.1 setup in my living room (I used to have this in my theater room before I bought a denon x4300h for its atmos/4K support). Today I was listening to music in all channel mode and noticed that my right surround channel had static. I swapped cables between left and right and the problem followed the channel and not the speaker. The cables look ok. I swapped cables as well. Looks like there might a component failure causing the distortion on that channel. Yikes.


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post #4682 of 4714 Old 12-24-2018, 12:32 AM
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Quote:
Originally Posted by Lynyrd View Post
Sorry,if the hdmi board of T765 VM100 is good for T775.
Yes. See attached matrix.
Attached Files
File Type: pdf MDC_Matrix.pdf (313.9 KB, 34 views)
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post #4683 of 4714 Old 12-24-2018, 10:59 AM
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Ok,thank you.
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post #4684 of 4714 Old 01-22-2019, 02:10 AM
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Originally Posted by wjcole View Post
I have a T775 with the VM150 module and it was damaged by lightning. Looking for a replacement VM150 - anybody out there have one they would like to sell?

Hi,
I will have a VM150, VM150X and AM200 for sale soon, if you still have a need for these boards.


I am in the process of buying the AM230 and VM300.
Let me know,
Pierre
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post #4685 of 4714 Old 01-25-2019, 09:49 AM
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Originally Posted by wjcole View Post
I have a T775 with the VM150 module and it was damaged by lightning. Looking for a replacement VM150 - anybody out there have one they would like to sell?
Hi wjcole,
Just to let you know that I will have a VM150 (also VM150X) for sale very soon, as I updated to the VM300.
Let me know if you still have a ned for that board,

Pierre
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post #4686 of 4714 Old 01-25-2019, 11:07 PM
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Hey everyone, just picked up a used T765HD for the bedroom and had a some questions. Hard to get much insight from searching, particularly with the T765 models.

Is the difference between the HD and HD2 software or hardware related? To add ARC would that require a newer VM board (this one comes with VM100)?

This has firmware version 1.20. If I download the new firmware from website, do you think it's safe to install based on everyone's experience? Read about the dreaded Check DSP error.

Thanks for the help. I am new to NAD, have always been using Denon and now on Marantz pre/pro for our main setup.
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post #4687 of 4714 Old 01-27-2019, 11:24 AM
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Originally Posted by eziggy View Post
Hey everyone, just picked up a used T765HD for the bedroom and had a some questions. Hard to get much insight from searching, particularly with the T765 models.

Is the difference between the HD and HD2 software or hardware related? To add ARC would that require a newer VM board (this one comes with VM100)?

This has firmware version 1.20. If I download the new firmware from website, do you think it's safe to install based on everyone's experience? Read about the dreaded Check DSP error.

Thanks for the help. I am new to NAD, have always been using Denon and now on Marantz pre/pro for our main setup.
Hi there! I believe the difference is related to different AM and VM boards (like with the T785 & T785HD). I'm pretty sure that to have ARC you need a more recent board (like the VM150). I might have one to sell in the future (upgrading to a VM300). Regarding firmware, usually the old "if it aint broke, don't fix it" rules, but I did update my amp with no issues a few times. You'll be forced to do so if you change any of the boards.

Cheers!
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post #4688 of 4714 Old 01-27-2019, 11:25 AM
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Originally Posted by Jazzmusic View Post
Hi,
I will have a VM150, VM150X and AM200 for sale soon, if you still have a need for these boards.


I am in the process of buying the AM230 and VM300.
Let me know,
Pierre
I'm in the process of doing the same, which model are you upgrading?
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post #4689 of 4714 Old 01-27-2019, 11:33 AM
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HI,
I am upgrading the T175HD.
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post #4690 of 4714 Old 01-27-2019, 01:53 PM
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Quote:
Originally Posted by Ender66 View Post
Hi there! I believe the difference is related to different AM and VM boards (like with the T785 & T785HD). I'm pretty sure that to have ARC you need a more recent board (like the VM150). I might have one to sell in the future (upgrading to a VM300). Regarding firmware, usually the old "if it aint broke, don't fix it" rules, but I did update my amp with no issues a few times. You'll be forced to do so if you change any of the boards.

Cheers!
Thanks! Is it required to have a service technician do the card installs or specialized firmware updates, or can one do it themselves and run the firmware update?
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post #4691 of 4714 Old 01-28-2019, 10:04 AM
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Originally Posted by eziggy View Post
Thanks! Is it required to have a service technician do the card installs or specialized firmware updates, or can one do it themselves and run the firmware update?
It is not required to have a service technician do it, unless you are uncomfortable with doing it yourself. If you have replaced cards and updated BIOS on a PC before, it is no more difficult than that. Just be sure you get the right firmware version for your model and the card(s) you will be using.

Mark
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post #4692 of 4714 Old 01-28-2019, 10:09 AM
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Originally Posted by Ender66 View Post
Hi there! I believe the difference is related to different AM and VM boards (like with the T785 & T785HD). I'm pretty sure that to have ARC you need a more recent board (like the VM150). I might have one to sell in the future (upgrading to a VM300). Regarding firmware, usually the old "if it aint broke, don't fix it" rules, but I did update my amp with no issues a few times. You'll be forced to do so if you change any of the boards.

Cheers!
Thanks for the insight. Let me know if you decide to sell the VM150, don't need anything other ARC for volume control via HDMI seems like the VM120 or VM150 would work.
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post #4693 of 4714 Old 01-28-2019, 10:12 AM
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Originally Posted by NCCaniac View Post
It is not required to have a service technician do it, unless you are uncomfortable with doing it yourself. If you have replaced cards and updated BIOS on a PC before, it is no more difficult than that. Just be sure you get the right firmware version for your model and the card(s) you will be using.
Great, I figured but wanted to make sure. I noticed you can get the Txx5 bios on NAD's site. Is that an all inclusive bios update or do I need to get more specific board upgrade BIOS's.

Appreciate all the insight!
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post #4694 of 4714 Old 01-28-2019, 10:24 AM
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Originally Posted by eziggy View Post
Great, I figured but wanted to make sure. I noticed you can get the Txx5 bios on NAD's site. Is that an all inclusive bios update or do I need to get more specific board upgrade BIOS's.

Appreciate all the insight!

No, there are not specific firmware files for individual boards. What you want to be sure is that the firmware you download supports the boards you are using. The firmware should come with a README file or something that says what Txxx models and MDC boards it supports.

Mark
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post #4695 of 4714 Old 01-28-2019, 04:48 PM
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Originally Posted by eziggy View Post
Thanks for the insight. Let me know if you decide to sell the VM150, don't need anything other ARC for volume control via HDMI seems like the VM120 or VM150 would work.
Quote:
Originally Posted by eziggy View Post
Great, I figured but wanted to make sure. I noticed you can get the Txx5 bios on NAD's site. Is that an all inclusive bios update or do I need to get more specific board upgrade BIOS's.

Appreciate all the insight!
Yep, I'll keep you updated once I have the VM300. For volume control you do not need ARC tho, but CEC. Don't the VM100 support it?

Regarding the firmware, it's pretty foolproof, there is only one .exe file to download (for TXX5), and the tool will detect automatically which board you have, and with which firmware installed (AM, VM, analog and main board).
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post #4696 of 4714 Old 01-28-2019, 04:50 PM
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Originally Posted by Jazzmusic View Post
HI,
I am upgrading the T175HD.
Nice , i'm doing the same, but with a T785. Tell us how it goes.
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post #4697 of 4714 Old 01-29-2019, 03:06 AM
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Originally Posted by Ender66 View Post
Nice , i'm doing the same, but with a T785. Tell us how it goes.
Ender66 could you send that message to eziggy (I can't pm him, I don't have enough messages yet).
eziggy is interrested in my boards.



Hi eziggy,
I am asking $255 for the VM150 and $85 for the VM150X.
If you take both, price will be $300US.
Let me if you are interrested,
Regards,
Pierre
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post #4698 of 4714 Old 01-29-2019, 01:13 PM
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Originally Posted by Jazzmusic View Post
Ender66 could you send that message to eziggy (I can't pm him, I don't have enough messages yet).
eziggy is interrested in my boards.



Hi eziggy,
I am asking $255 for the VM150 and $85 for the VM150X.
If you take both, price will be $300US.
Let me if you are interrested,
Regards,
Pierre
Thanks guys, going to do the firmware upgrade when I get my cable tomorrow. Would be good to see if CEC will pop up. Next step would be board upgrades.
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post #4699 of 4714 Old 02-10-2019, 07:26 AM
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Nad mdc vm150+vm150x.

Just to confirm that I now have for sale the NAD MDC VM150+VM150X. Fully functionnal, they have been replaced by AM230+VM300. Let me know if you interrested.
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post #4700 of 4714 Old 02-15-2019, 02:49 PM
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Originally Posted by wjcole View Post
I have a T775 with the VM150 module and it was damaged by lightning. Looking for a replacement VM150 - anybody out there have one they would like to sell?
Hi wjcole,
I have a set of VM150 + VM150X for sale.
Let me know if interrested.
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post #4701 of 4714 Old 02-17-2019, 10:34 AM
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Originally Posted by Jay Anderfuren View Post
I have a T785 with a bad AM200. Does anyone that has upgraded to the AM230 have one sitting around they'd be willing to sell? I have no need for Atmos in my setup and I really don't want to spend $550 to upgrade to a card I don't need. Thanks.
Hi Jay,
I have a AM200 for sale if you are still looking for that board.
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post #4702 of 4714 Old 02-19-2019, 08:04 AM
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Originally Posted by Jazzmusic View Post
Hi,
I will have a VM150, VM150X and AM200 for sale soon, if you still have a need for these boards.


I am in the process of buying the AM230 and VM300.
Let me know,
Pierre
I sent you a PM, I am interested in your VM150 and AM200 if they aren't already spoken for.

Thanks,
Greg
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post #4703 of 4714 Old 03-15-2019, 03:52 PM
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My 75 is slowly having problems. A few months ago, my right rear channel started having distortions. Now my center channel is having a small distortion. Not as bad as surround but still. I wonder if this is going to get worse. That sucks!


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post #4704 of 4714 Old 03-15-2019, 05:38 PM
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Originally Posted by bommai View Post
My 75 is slowly having problems. A few months ago, my right rear channel started having distortions. Now my center channel is having a small distortion. Not as bad as surround but still. I wonder if this is going to get worse. That sucks!


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I probably don't have good news for you. My right front channel went completely out a couple of years back. It was diagnosed as a bad amp module. Cost to repair was $1200. I paid $1095 for the whole receiver. I really have had a love hate relationship with this receiver during the 8 years I've had it. I love the sound, but think the reliability is not good. I ended up keeping it and buying a seperate power amp. So now the T775 is doing pre-amp / processor duties and I'll look to get a dedicated pre / pro when it dies. The only issue I have with it right now, is that the fans make a horrible noise when the receiver is first started up.
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post #4705 of 4714 Old 03-15-2019, 06:25 PM
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I probably don't have good news for you. My right front channel went completely out a couple of years back. It was diagnosed as a bad amp module. Cost to repair was $1200. I paid $1095 for the whole receiver. I really have had a love hate relationship with this receiver during the 8 years I've had it. I love the sound, but think the reliability is not good. I ended up keeping it and buying a seperate power amp. So now the T775 is doing pre-amp / processor duties and I'll look to get a dedicated pre / pro when it dies. The only issue I have with it right now, is that the fans make a horrible noise when the receiver is first started up.

I bought mine for $1299 from Saturday Audio in 2011. Within 2 years I had the front right amp go completely dead just like yours. Luckily it was under warranty and got it fixed for free. Nad was also nice enough to give me a free upgrade to vM150 from my buggy vm100. So I hade had vm150 and am200. I have had several issues over the years including volume randomly rising by itself and having funky reading from audyssey. I kept it for the sound. Just less than 2 years ago I got the denon x4300 to get atmos and 4K pass through. I moved the 775 to my living room for a smaller 5.1 system. I am using my denon with a nad t763 as a power amp in my theater room. Now the 775 is going bad. Yikes. Looks like the center is getting pretty scratchy now. I have downgraded it to stereo now. I don’t really want to buy another receiver now for downstairs. Even if I do it will be something cheap.


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post #4706 of 4714 Old 03-18-2019, 09:40 AM
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Originally Posted by gdpeck View Post
I probably don't have good news for you. My right front channel went completely out a couple of years back. It was diagnosed as a bad amp module. Cost to repair was $1200. I paid $1095 for the whole receiver. I really have had a love hate relationship with this receiver during the 8 years I've had it. I love the sound, but think the reliability is not good. I ended up keeping it and buying a seperate power amp. So now the T775 is doing pre-amp / processor duties and I'll look to get a dedicated pre / pro when it dies. The only issue I have with it right now, is that the fans make a horrible noise when the receiver is first started up.
@bommai I can't give you an exact quote on what it would cost to repair your T775, but when the left front channel amp module went out on my T775, I contacted Bart Gravino at Elite Audio Repair and Restoration. He is listed in the NAD authorized repair center list from the NAD support page. He also could not give me a quote via e-mail, but he said the repair diagnosis/estimate would be $50 (if I remember correctly) and he would not do any repair on the unit after diagnosing without approval. In my case, it was a bad amp module, and he told me while replacing it, he proactively replaced the others (with my approval) to avoid any similar issue in the short term. The overall cost for repair was very reasonable (in my opinion) and my 7775 has been working great for the last six months. I can highly recommend Bart. Very thorough and professional.

Mark
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post #4707 of 4714 Old 03-18-2019, 10:43 AM
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@NCCaniac thanks for the info. I am also going to ask a friend who is good with these and fixed bad diodes on my T763. The two units are similar except for the MDC and digital parts.


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post #4708 of 4714 Old 03-23-2019, 12:07 PM
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I am so fortunate to have a great friend that knows electronics circuits, especially audio gear.
He was able to solve and fix the distortion problem on my T775HD’s center and surround right channel. Before taking it to him, I already determined that the problem is on the analog side because the distortion existed both on hdmi source as well as 7.1 ch analog input source. I pulled out all the MDC cards and looked at the amp board that handles the right channels and center channel ( the other board handles the left channels). In fact several years ago the front right channel went dead and NAD authorized service center had replace the whole amp board. It was a newer board that said T765/T775/T777 while all the other boards said T765/T775/T785. My friend downloaded the schematics and I am attaching it below.


The circled transistor were the culprit. Nothing wrong with the component itself but the soldering and the subsequent washing of the board was not done well. He cleaned it up and reflowed the solder and voila, the distortion was gone. He said the same shoddy job was on both channels at the same component. Thanks to my friend, I have a great sounding receiver back in service.


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post #4709 of 4714 Old 03-29-2019, 07:55 AM
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I wanted to report that I reran Audyssey on my fixed 775 (I had not run it in a while) and listened to some music in my living room and the sound is amazing. The previously distorted center and surround right channels sound great. I would say it sounds better than my denon x4300 upstairs but the only reason I have the denon is for the
4K and atmos. If I ever upgrade my nad, I will get the T777 or equivalent to get similar performance of the 775 and also get atmos, 4K and Dirac. But that has to wait!


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post #4710 of 4714 Old 04-28-2019, 06:57 PM
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Great to hear you were able to sort out the problem with a home solution.

I've had my T775 for 6 years now, under warranty the audio drop out, Check DSP Board error (AM200) and noisy fans were repaired (no components were replaced, all repaired/FW updated). I then got a relatively smooth 3.5 years, were only start-up fan noise was a problem last winter.

In the last few weeks a zone 2 channel has gone and I get the Check DSP board error for ~3 minutes on cold mornings and then it is fine for the rest of the day.

Inspired by your success I took it apart, cleaned the MDC card contacts (the repair shop said that is all they did last time around) and re-soldiered what looked to be a dry joint on on the 1952 transistor on the AM200 card, but the unit is no better or worse after my tinkering.

The blown channel I didn't even attempt to fix, far more disassembly than I had time for.

As per your thoughts over the years I'm always vacillating between sending it out for professional repair or just calling it quits on NAD reliability and finding something else.

Last edited by nijimon; 05-25-2019 at 04:02 PM.
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