- I plug in the factory mic and the screen says "Auto Set
- Then I press the "<" button on the remote but nothing happens.
- For that matter, nothing happens after pressing any of the Arrow or Enter buttons on either side of the remote, or rotating or pressing the <> knob on the 1708.
- The "<" button on the remote works fine in manual setup.
- If Front speakers are set to "Small", they give no sound at all. They work fine if set to "Large".
- Surround speakers give no sound on Small or Large settings, for any Surround mode.
- Subwoofer Pre-Out doesn't work on any setting or surround mode, even if all other speakers are set to "Small", and Sub is set to "Yes", for any SW Mode or Crossover Hz, or "2ch Direct/Stereo Custom" setting. (It does emit an extremely faint signal from the input source but it doesn't scale with volume--measures less than 2 mVac. Also, the Sub Pre-Out jack works fine if a signal is piped directly into the Ext-In SW jack.)
- No test tones are emitted for either the "Auto" or "Manual" methods. This might be related to the Auto Setup problem above, since test tones would have followed "<".
- None of the Surround speakers work in any mode.
- Front Speakers only work if in the "Stereo" and "Direct" modes.
A&B Speaker Buttons/Lights:
Microprocessor Reset procedure:
Done numerous times but no affect on any of the above problems. It does reset the settings to factory defaults, and Speakers to A.
I've independently checked the surround speakers and subwoofer and they work fine.
So it basically functions only as a 2.0 stereo receiver. Internally, it seems like the problem is in the interface between the microprocessor and output circuits.
- Has anyone experienced similar problems/solution?
- Is there a "deeper" reset procedure, perhaps by opening up the unit? (Um, short of replacing all the boards, or throwing off a nearby cliff )
I'm virtually certain now the problem is in the DSP, as all the symptoms relate directly to that.
The power amps for all the Surround channels are fine: I piped a source to the Ext-In Surround jacks and that gives normal output to all surround speakers.
The A&B Speaker buttons are working fine... I may have not understood the delays and autoswitching before.
I took off the top and see there is a motherboard on the back-right with 3 daughter cards (top to bottom): HDMI board, Video board, and an analog input board. The HDMI board has a monster chip, ADSP-21367, which according to Analog Devices' website is a
All the other chips in the 1708 appear to be rather pedestrian, so they are using the HDMI board to do audio DSP work.
High-Performance 32-bit Floating-Point SHARC Processor for Home Theater...
offers industry standard audio decoder & post-processing algorithms such as:
* Dolby Digital*
* Dolby Digital EX2*
* Dolby Pro Logic IIx*
* DTS 5.1*
* DTS ES*
* DTS Neo:6*
* DTS 96/24*
* WMAPRO 7.1*
* AAC (LC)
Anyone have a 1708 that is otherwise not working, for parts?
Or, can consumers buy these boards directly?
This is kinda fun, esp if I can actually fix it.
All I did was blow some dust off the HDMI board, then checked/resecured all the connections (to the motherboard, various plugs).
Power up. Voila! Surround modes work! Subwoofer works! Auto-setup is running as I write!
The problem very well might come back, but for now life is great.
I had the amp in storage, so i now figure that humidity lead to some form of tiny corosion to some connectors. However, this is an assumption only.
Thanks David82282! Awesome.
Hope it stays un-dusty for at least a year.
Edit- Worked beautifully but only for about 90 minutes and the back to trouble. I have to use Analog till I get replace it.
Sorry to use this old thread but after 2 years of no use,
I decided to grab my amp from my storage and to set it up.
When booting I successfully "Auto Setup" with mic and start plugging my PS3 HDMI Cable for video and optical cable for sound.
Unfortunatly there was no sound at all.
I switched the PS3 with another device on the same setup (hdmi for video and optical for sound), same negative result.
At first, I though the problem was coming from the optical cable, maybe it was faulty.
After buying a new one, the same issue occured !
So I decided to reconfigure the Auto Setup and the big problem arrived !
I got exactly the symptoms mentioned by david82282 concerning Auto Setup !
Just after connecting microphone, impossible to use remote controller or enter button on front to launch Auto Setup procedure :-(
I really dont know why Auto Setup is no more working now...... only one night, some plugs in all hdmi ports between theses two attempts..
After googling I found this post and follow fixed procedure by david82282 .
I did reset factoring and open the case, remove some dust but it is still not working ....
I completely removed the hdmi motherboard for cleaning, no help.
I'm just posting this message for help if anyone still interested or more information on the subject
Thank you all
Update on my 1708 -- the hdmi board is still working fine. But about 6 months ago, the receiver started making very loud pops through the speakers, blinking red power light, protection mode, etc. A little reading on avsforum indicated dust can cause that, too. So I used compressed air, especially on the main amp board, reseated connectors... fixed again! Maybe I'm getting lucky... I know dust isn't the cause of all problems, but apparently more than a few.