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Anthem MRX 720 HDMI Problem


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Hi

 

I have an issue after having had my MRX 720 repaired with a new board.

 

The initial problem is fixed however i can no longer get sound if I use EArc from the TV to ARC on the Anthem.

 

Video works fine.

 

The only way I can get audio is to set-up a new Input and set Audio to Optical In and use an optical cable.

 

Is very strange, have tried different HDMI output on the Anthem, have tried setting audio to HDMI and not ARC but still the same problem.

 

Has anyone come across this before?

 

Cheers

 

 

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Isn’t this exactly same ? Obviously these anthems are not great with hdmi and  video board ?

 

https://www.stereonet.com/forums/topic/231088-anthem-av-owners-thread/?do=findComment&comment=6345227



 

“Word of warning.

 

So I had a MRX720 with a faulty HDMI board (audio worked fine when using an external video splitter) and dropped it into AV Digitech for repair, they quoted my $1000 to replace the HDMI board and after 4 weeks told me the video worked but audio did not they ummed and ah-ed and said another part was on the way to fix it, so they ordered a second part and then finally told me it was working but wanted another $700 to let me pick it up.”

 

appears pretty much same issue ?

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hmmm i actually read that myself and was wondering the same. My board was fixed however, the issue at the time was the volume randomly going up to maximum without any input from the remote, would make you jump out of the chair. That issue is now fixed, but now this other issue. Was under warranty when my board was fixed but is no longer. I am not too familiar with the in's and out;s of hdmi v optical however by googling it looks like HDMI can play higher resolution audio so is a shame to miss out on it. 

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Just now, Arry74 said:

My board was fixed however, the issue at the time was the volume randomly going up to maximum without any input from the remote, would make you jump out of the chair.

This happened to someone in recent months trying out a avm90 and been a few reports then from folks who experienced the same so consented to your machine

 

2 minutes ago, Arry74 said:

but now this other issue. Was under warranty when my board was fixed but is no longer. I am not too familiar with the in's and out;s of hdmi v optical however by googling it looks like HDMI can play higher resolution audio so is a shame to miss out on it. 

Yes things like higher res picture and lossless audio need hdmi and would make it a must I would think 

 

even if out of warranty I would push on this under “statutory warranty” as possibly seems a common issue ?

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The technician that repaired it, said it is an issue because the Anthem gets too hot which affects the volume control but that's all he told me.

 

hmmm yes I would definitely like to get HDMI audio working then.

 

I will look into whether the issue can be sorted under statutory warranty.

 

Thanks for the advice.  

 

 

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Interestingly i just stumbled across my own post from 2019. I thought it was the TV but it must have been the amp. I have since bought a new TV but now I cannot remember how i had it setup. I presume it was just using an optical cable this entire time. I titled the post badly as ARC in Anthem world has another meaning. 

 

 

 

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4 hours ago, Arry74 said:

The technician that repaired it, said it is an issue because the Anthem gets too hot which affects the volume control but that's all he told me.

 

Arry how is the anthem located ? inside a cabinet ? adequate ventilation ? 

 

peaking inside the box i have never understood this aspect of the anthem where they have a heatsink clearly which will have hot air rising ..but then it has a fan either blowing air on it but from just inside the box ? and flat upto the heatsink which will just push the hot air back into the case ? or if drawing away from heatsink its going to be pushing it on the hdmi board. 

 

quite a small heatsink as well so imagine it runs HOT ! 

 

image.png.d04dcc95fc0d018c722276f844a7c91c.png

 

so can understand the tech saying what does that anthem gets to hot and effects the volume control... especially if tis the board alongside the heatsink ! and hdmi board that is also along side it ...

 

have you considered monitoring temps with either sitting a temp probe on the case or slightly poking above the heatsink ? might find elevated temps ?

 

in which case it might be worth getting a usb fan eg the ac infinity ?...sit on top of case and let it draw air out the top

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I can confirm these run extremely hot and should be totally located in open air (not in a cabinet) and with auxiliary cooling like an AC infinity AV cooler if possible. Hell, I think I might get some stick on heat sinks and attach them to any uncovered chip that shows up on my thermal camera.

 

That said, I've never used the ARC audio on mine, since it doesn't support E-ARC I am running everything directly to the HDMI ins and don't use any TV app audio at all.

 

Some things to check though, reset all CEC options (CEC is usually required for ARC to function) and reset the audio settings in the TV too. might be worth attempting a factory reset of the amp itself if you don't mind re-kerjiggering your settings.

 

As much as I love the performance and features (virtual inputs is my favourite feature) I doubt my next receiver will be another Anthem.

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21 hours ago, betty boop said:

Arry how is the anthem located ? inside a cabinet ? adequate ventilation ? 

It is in a cabinet however the front and back of the cabinet are open. The bottom obviously is touching the cabinet however the top of the Anthem is very close to the cabinet top so yes I can see how the top of it could be getting pretty hot. The thing is though that HDMI Audio has never worked even from the very beginning so i dont think that heat could of caused this.

 

21 hours ago, betty boop said:

have you considered monitoring temps with either sitting a temp probe on the case or slightly poking above the heatsink ? might find elevated temps ?

I haven't thought of doing this, might be something to consider

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2 hours ago, GaryT said:

I can confirm these run extremely hot and should be totally located in open air (not in a cabinet) and with auxiliary cooling like an AC infinity AV cooler if possible. Hell, I think I might get some stick on heat sinks and attach them to any uncovered chip that shows up on my thermal camera.

 

That said, I've never used the ARC audio on mine, since it doesn't support E-ARC I am running everything directly to the HDMI ins and don't use any TV app audio at all.

 

Some things to check though, reset all CEC options (CEC is usually required for ARC to function) and reset the audio settings in the TV too. might be worth attempting a factory reset of the amp itself if you don't mind re-kerjiggering your settings.

 

As much as I love the performance and features (virtual inputs is my favourite feature) I doubt my next receiver will be another Anthem.

 

Thanks for the information regarding the heat. So you just run the TV and any app like Netflix via the TV speakers? 

 

My TV has an E-ARC port which is also ARC from the looks of it so i am thinking that that should work?

 

Yes I have reset all CEC options on both the TV and the Anthem. When I received the Anthem back from repair it had already been reset.

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One thing as well I am unsure of is how the Inputs work exactly. For example for the TV the HDMI cable goes from the TV Input to the Anthem Output, this makes sense to me. 

 

Then the 7 inputs on the Anthem are used for things such as my DVD player. This also makes sense as I have a HDMI cable going from the DVD Player Out to the Anthem IN and this works correctly, i get picture plus sound.

 

The only way I can get audio from the TV to the Anthem is by configuring the Input as per attached picture and using the Optical Cable.

 

What I don't understand is why the sound only works when I select the optical option on the audio, i.e. this is an Input so how does it relate to the TV?

 

Why does the TV need to be configured as an Input to work?

 

Hope you understand what  I am saying.

 

Cheers

 

PXL_20240412_034254066.jpg

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On 12/04/2024 at 6:35 PM, Arry74 said:

So you just run the TV and any app like Netflix via the TV speakers

I don't use TV apps at  all, I have external devices connected directly to the receiver and only video passes from the receiver to the TV.

 

 

If HDMI arc audio is not working on your unit then yes you would have to configure an input and use optical, call it TV, then switch to that input when you want to use apps on your TV.

One of the audio sources when configuring an input is called HDMI ARC, that is the return audio from the TV that run back down the video output cable. Even in that configuration, the TV is an input, its audio feed is a separate source that needs to be called up when you want to use it rather than for example direct audio from a device connected to the receiver, like a HDMI Bluray player or streaming box. Same when using an optical cable, the TV is outputting audio and that is just another generic source as far as the amplifier is concerned.

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