Denon avr 2802 with no sound on speaker

[sparx_59]

Re: Denon avr 2802 with no sound on speaker

I think you may be right at this one.
Only thing I know is i checked all voltages, regulators and clocks.
Nothing was out of the ordinary.

Let's see what time tells us after this fix

My receiver works perfect after the chip replacement, and i hope it will do so for many years, because it sounds so good!

And thanks for the compliment

[Longbow]

Re: Denon avr 2802 with no sound on speaker

Thanks for the very interesting topic. You have certainly gone much further than anyone else to discover these problems. A few questions come to mind on this problem, depending up on how this chip is used. If this chip is a ROM holding program information for a larger CPU, it seems like the lifetime would be far longer than 4-5 years. As a 3 volt chip, there may also be some other circuit board contamination issues that might cause faulty reads. In any case, good show.

[sparx_59]

Re: Denon avr 2802 with no sound on speaker

Hey sparx_59,
same for me please?
I really want to rescue this nice Device

Thank you in anticipation!

When I get the new chips, 1st one is for you

[Chris2990]

Re: Denon avr 2802 with no sound on speaker

Hi sparx_59, i am 99% sure that this chip on my DSP board has failed. I have taken the board out and can replace it, however do not have any way of programming the device. Is there any way I can purchase a programmed chip from you please. Many thanks

Hey sparx_59,
same for me please?
I really want to rescue this nice Device

Thank you in anticipation!

[sparx_59]

Re: Denon avr 2802 with no sound on speaker

Sure mate
Please mail me your adress , and I'll take care of it .

[Profguy01]

Re: Denon avr 2802 with no sound on speaker

Hi sparx_59, i am 99% sure that this chip on my DSP board has failed. I have taken the board out and can replace it, however do not have any way of programming the device. Is there any way I can purchase a programmed chip from you please. Many thanks

[sparx_59]

Re: Denon avr 2802 with no sound on speaker

Ok, I know
What I meant, was I can order @ work.
I pay a fair price, and it's fast.

[Agent24]

Re: Denon avr 2802 with no sound on speaker

Also can I order chips as a private person

Sure, but it depends who you're buying from.

The most well-known international components distributors are:
http://www.rs-components.com/index.html
or http://www.farnell.com
or http://www.digikey.com/us/en/International/global.html
or http://www.mouser.com/localsites.aspx
They will all ship to an individual, but some will have minimum order requirements, or high shipping cost. You will have to look at all of them and find which one suits you best.

You may be able to find a re-seller or such in your own country too.

And of course, there's always eBay. A lot of sellers there from Asia will ship worldwide for very low cost or even for free, but not all of them sell genuine parts...

[sparx_59]

Re: Denon avr 2802 with no sound on speaker

Well, I am lucky enough to use one of these : http://www.xeltek.com/universal-programmer
We have 2 of them @ work, and in my break I program them.
Also can I order chips as a private person

[Chungalin]

Re: Denon avr 2802 with no sound on speaker

I’ve never programmed a parallel Flash Memory (TSOP), only serial EEPROM. What kind of programmer do you use?

[sparx_59]

Re: Denon avr 2802 with no sound on speaker

I use the exact same chip. They are still available.

[Chungalin]

Re: Denon avr 2802 with no sound on speaker

Is it an Atmel AT49LV002-70TC ? Is it still available or do you use an equivalent?

[sparx_59]

Re: Denon avr 2802 with no sound on speaker

Yeah, 1st log I found was around 2007 and up.
Lots of denon's died after 5 or 6 years.
I really don't know why no one copied the rom before.
Probably because they had to remove the rom from a working board.
I just took a shot at it, by copiying a rom witch dump looked ok.
It could not have been an accindental overwrite of data, because the write enable is pulled up to the positive rail, so it had to be a bad readable rom. This also explains why the board worked sometimes and after turning a knob, it stopped working.
The Cpu is to fast in this case, but a programmer reads lots slower, and that solved my problem. Sad thing is very few ppl read the old posts where they talk about the problem. So here I am with a fix for a really great receiver, and I cannot help, because it took to damn long

[Chungalin]

Re: Denon avr 2802 with no sound on speaker

Actually, I already met one back in 2010. Symtptom was "no sound" (I deduct from my notes that everything else seemed OK) and I suspected that was something related to DSP board. I was unable to fix it and it was returned to customer without solution. What a shame...

[sparx_59]

Re: Denon avr 2802 with no sound on speaker

Congrats for the good job and thanks for sharing. I'll keep the file just in case I meet one of these.

De nada

[Chungalin]

Re: Denon avr 2802 with no sound on speaker

Congrats for the good job and thanks for sharing. I'll keep the file just in case I meet one of these.

[sparx_59]

Re: Denon avr 2802 with no sound on speaker

Here you go
https://www.dropbox.com/s/fcembdd9eq...02%20dump?dl=0

Flash it on a new chip, solder it on the board, and ready!

[Agent24]

Re: Denon avr 2802 with no sound on speaker

That's great to hear! I'm sure people would be very grateful if you were to upload the firmware image here or somewhere like Elektrotanya

[sparx_59]

Re: Denon avr 2802 with no sound on speaker

To be complete: The problem is the IC817. This is a flash chip wich holds the data for the DSP uprocessor. This chip will sometimes fail. The data is still in it, but the processor has problems reading it due to wear. In other words: the chip is getting old. I was lucky enough to be able to read the data from a faulty chip with a programmer. Flashing this data in a freash chip resulted in a fully working rom. I had replaced two boards with these chips, and this fixed the problem. I know Denon does not support the avr 2802 anymore, so I want to share the fix to help ppl with this problem. Please feel free to ask any question! I am happy to answer them.

[sparx_59]

Re: Denon avr 2802 with no sound on speaker

Hi guys,
Old topic, I know , but still I want to let you know I fixed it today.
I was able to flash some new chips and replace them on the DSP board.
Until now I fixed my 2 receivers, and I am willing to share it.
Please feel free to contact me.

Henk