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I have a Mitsubishi receiver m-av1 and after I turned the…

Customer Question
I have a Mitsubishi...

I have a Mitsubishi receiver m-av1 and after I turned the volume really loud I hear a click and the receiver stop working

Technician's Assistant: Can you guesstimate how old your Mitsubishi is? And just to clarify, what's the exact model?

MODEL M-AV1

Technician's Assistant: How long has this been going on? What troubleshooting have you tried?

I measured the fuses and they are good

Technician's Assistant: Anything else you want the Electronics Expert to know before I connect you?

There was a second double click and tell me that the receiver is good , now I can hear that double click

Submitted: 10 months ago.Category: Home Theater-Stereo
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Customer reply replied 10 months ago
when I was powering on usualy I was hearing one click and after 3 seconds another click but now I cannot hear
that second click
Customer reply replied 10 months ago
any help?
Customer reply replied 10 months ago
the LCD is working but not audio
the issue start happening after I turned the volume loud and I hear a very loud click and not sound after that
Customer reply replied 10 months ago
any help
Answered in 14 hours by:
10/5/2017
Technician: Nathan, Engineer replied 10 months ago
Nathan
Nathan, Engineer
Category: Home Theater-Stereo
Satisfied Customers: 31,490
Experience: Custom home theater installer. Authorized dealer top brands
Verified

Hi, I'm Nathan.
Sorry to hear that you're having trouble, but I'll do my best to help you. Please give me a few moments to review your details here.

My apologies for the delay. The site is not quite instant, but please try to send only a single response and allow us time to receive it and respond back; multiple messages can get lost in the queue and further delayed.

If you plug in headphones, are you able to get audio through them?
Is the display or power light flashing at all?

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Customer reply replied 10 months ago
No audio at all, lights on the display are good, the unit was working good until I turned the volume all the way up 80% I was able to hear a little click that tell me that something blown out
Customer reply replied 10 months ago
Before the issue when I power on I was able to hear a click and another click after 5 second but now I only can hear one click
Technician: Nathan, Engineer replied 10 months ago

That is exactly what happened, the unit is either in a protection mode or you blew out some components in the amplifier output stage.

Try unplugging the power, and disconnecting all of the speakers, wait at least an hour,

then power it on with nothing connected (leave the speakers and inputs disconnected still) and see if you get any clicks, and try headphones at that point as well if you can.

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Customer reply replied 10 months ago
Ok I will do that now and let you know later
Customer reply replied 10 months ago
anything else that I can try, is there any specific component that I can test?
Technician: Nathan, Engineer replied 10 months ago

Not at this point

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Customer reply replied 10 months ago
ok thanks, ***** ***** let you know what happen soon
Technician: Nathan, Engineer replied 10 months ago

You're welcome!

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Customer reply replied 10 months ago
Hi, I did what you told me to do but still same issue
Customer reply replied 10 months ago
I can hear only one click when I power ON but no the second click after 5 seconds
Technician: Nathan, Engineer replied 10 months ago

Thank you for checking,

unfortunately that does confirm that there is a hardware failure here and that the internal power supply or amp output is damaged.

This is most likely the result of the amp being blown by over driving it, but could easily just be normal age related wear and tear. This is a 27 year old model that was built for a service life of about 5 years. There are no parts available for them and it would not be considered repairable. Component level repairs, assuming even generic electronic parts can be sourced, would cost you far more than the system is worth and more than you would spend to buy a brand new model with updated current features and a fresh warranty. I can recommend some replacement options for you if you would like.

My apologies for the news,

Nathan

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Customer reply replied 10 months ago
I would like to repair this receiver
Technician: Nathan, Engineer replied 10 months ago

I would not consider it worth trying to repair.

If you wanted to try, you would be starting by testing the voltage outputs of the power supply and look for any burned or damaged output transistors in the amplifier stage. Keep in mind that this is a digital amp, there is a lot of integrated circuitry on these which is where the likely fault is, and none of those components are repairable.

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Customer reply replied 10 months ago
could you provide me a link to download the schematic?
Technician: Nathan, Engineer replied 10 months ago

There is no publicly available or no cost version of that, there are some options to purchase a service manual if you would be interested in that.

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Customer reply replied 10 months ago
you do not have any other solution, or recommendation, I think you are the expert on this electronics
Customer reply replied 10 months ago
I need to fix it, general answers is not what I was expecting for you guys
Technician: Nathan, Engineer replied 10 months ago

For this model, no, unfortunately I do not have other specifics for you. I do not have the service manual available as well, nor would most repair shops given the age of the system. Again it is so far past its service life at this point at nearly 30 years old that they weren't expected to be around to even need repairs, no one stocks parts or schematics for these anymore. I can send you a link to a source where you can purchase a service manual if you'd like.

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Customer reply replied 10 months ago
what I know is this, you guys charge me for help me troubleshooting the device, what are you taking about, buy new one, I can say that too to my customers
Customer reply replied 10 months ago
is there any other technician that could help me troubleshoot this device
Customer reply replied 10 months ago
Could you transfer me to another technician?
Technician: Nathan, Engineer replied 10 months ago

I've already opted out. If another tech wishes to help, they will step in if and when available.

Please do not respond back further here, as it will cause further delays and route you back to me preventing you from getting any other responses.

Best of luck to you with the receiver.

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