I have a Yamaha RX-V367 receiver. I had an accident with a TV Box that apparently shorted the HDMI input and fried the digital board about 10 years ago. I kept it.
Recently I tried to revive it with a scrap digital board I got from ebay. The receiver now displays the typical dead DSP behavior: no speaker icons, "TI BUS: Boot" and blank "TIVer" in the self-diagnostic mode, etc. Evrything else seems to work fine (the FM radio locks into stations, the selected HDMI input is routed to the output, the audio inputs can be routed to the output, etc.).
The seller of the board, assuming he's telling the truth, said the replacement board was tested (I don't really know what that means) and it was working. I updated the firmware (that was painful, since the receiver is old enough that it doesn't have a USB port, it has to be done through the SPDIF input and a CD) but that didn't change anything either, although the receiver informed that the update was successful and the correct firmware is displayed with the self-diagnostic mode.
I did measure the voltage of the regulators that feed the DSP (that's as far as my skills go) and they seem to be fine (3.3 V and 1.2 V).
A few questions:
1. Am I missing anything else I could try? I think I've exhausted the possibilities and it's in fact that the board has a dead DSP.
2. Is the DSP replaceable? The service manual says the DPS is TMS "D70YE101BRFP266", but all available DSP chips say TMS 320D70YE101BRFP QFP144. Are these the same or at least compatible? I'm attaching a picture but I don't know if that's enough to identify a replacement DSP.
3. Should the "Analog bypass" in self diagnostic mode work even is the DSP is dead? It's not working in my receiver (no speaker icons in the display, no sound). My question is because if it should still work, then something else is fried.
Should I just dump the receiver in the trash?
I'm in Argentina and these kind of receivers are extremely rare, while people ask insane amounts of money for them (like about u$s 500). So I'm very reluctant to just throw it away but and it's not easy to replace it either.
Any help/advice will be welcome!
Recently I tried to revive it with a scrap digital board I got from ebay. The receiver now displays the typical dead DSP behavior: no speaker icons, "TI BUS: Boot" and blank "TIVer" in the self-diagnostic mode, etc. Evrything else seems to work fine (the FM radio locks into stations, the selected HDMI input is routed to the output, the audio inputs can be routed to the output, etc.).
The seller of the board, assuming he's telling the truth, said the replacement board was tested (I don't really know what that means) and it was working. I updated the firmware (that was painful, since the receiver is old enough that it doesn't have a USB port, it has to be done through the SPDIF input and a CD) but that didn't change anything either, although the receiver informed that the update was successful and the correct firmware is displayed with the self-diagnostic mode.
I did measure the voltage of the regulators that feed the DSP (that's as far as my skills go) and they seem to be fine (3.3 V and 1.2 V).
A few questions:
1. Am I missing anything else I could try? I think I've exhausted the possibilities and it's in fact that the board has a dead DSP.
2. Is the DSP replaceable? The service manual says the DPS is TMS "D70YE101BRFP266", but all available DSP chips say TMS 320D70YE101BRFP QFP144. Are these the same or at least compatible? I'm attaching a picture but I don't know if that's enough to identify a replacement DSP.
3. Should the "Analog bypass" in self diagnostic mode work even is the DSP is dead? It's not working in my receiver (no speaker icons in the display, no sound). My question is because if it should still work, then something else is fried.
Should I just dump the receiver in the trash?
I'm in Argentina and these kind of receivers are extremely rare, while people ask insane amounts of money for them (like about u$s 500). So I'm very reluctant to just throw it away but and it's not easy to replace it either.
Any help/advice will be welcome!
Attachments
It probably has a direct or 'pure direct' mode that will bypass the DSP. You can try that. You can also try a factory reset to see if that helps. Otherwise to troubleshoot further, you need to scope the signal path to/from the DSP and look at the control signals to/from the DSP to make sure they are as expected. Also check the DSP reset and clock. If indeed it is faulty, do you have the skills and equipment to replace it? (since you have another board with possibly good DSP).
The analog bypass is supposed to be like the 'pure direct' mode but I still don't get any sound through the amp and speakers or speaker icons on the display. That's why I'm asking if anybody knows if that mode really bypasses the presence of the DSP. If that's the case, then something else may be wrong but it seems to me all other symptoms point towards a fried DSP.
I have a friend who can do the DSP swapping. All soldering I've done resembles more the work of a butcher than a technician, so I wouldnt trust myself with such a delicate job.
Thanks for the response!
I have a friend who can do the DSP swapping. All soldering I've done resembles more the work of a butcher than a technician, so I wouldnt trust myself with such a delicate job.
Thanks for the response!
It's not clear from your description if you get sound from HDMI or tuner inputs or any of the other inputs? Are you getting any sound at all? If you have analog bypass enabled, the tuner at least should produce sound out the speakers (provided the speakers are switched on and you're tuned to a station). If you don't get any sound from the tuner in analog bypass mode, then this would suggest it's more than just a DSP issue since the DSP is bypassed in that case.
But it does sound like there's also some kind of issue with the DSP if the MCU can't talk to it. You need get the scope out and look at the relevant SPI lines and DSP reset and clock to make sure they are OK. From the service manual:
Communication and bus line connection between microprocessor (IC221) and TI (DSP, IC241) are checked.
TI BUS:NoEr
NoEr:No error detected.
Boot:When “Boot” is displayed for a few seconds or “Boot” and “NoEr” are displayed alternately, there is a
possibility that an error had occurred.
There's also a possibility that the DSP flash memory wasn't programmed properly since the TIVer is blank? Or that could just be a side-effect of not being able to talk to the DSP.
But it does sound like there's also some kind of issue with the DSP if the MCU can't talk to it. You need get the scope out and look at the relevant SPI lines and DSP reset and clock to make sure they are OK. From the service manual:
Communication and bus line connection between microprocessor (IC221) and TI (DSP, IC241) are checked.
TI BUS:NoEr
NoEr:No error detected.
Boot:When “Boot” is displayed for a few seconds or “Boot” and “NoEr” are displayed alternately, there is a
possibility that an error had occurred.
There's also a possibility that the DSP flash memory wasn't programmed properly since the TIVer is blank? Or that could just be a side-effect of not being able to talk to the DSP.
The analog inputs work, because they can be routed to the analog output. I'm not sure if the digital inputs work because the receiver doesn't output digital inputs to analog outputs. BUT, I had to use the SPDIF CD input to update the firmware so I know that works.
I never got any kind of sound from the speakers because the analog bypass or the "Straight" mode don't seem to work either.
What's the DSP flash memory? How can it be programmed? There's many videos on youtube where the just swap the old DSP chip with a new one and the receiver starts working properly. I mean, they don't program anything, they just change the DSP.
The errors you mention from the service manual is what I'm experiencing, "TI Bus: Boot" apparently means the DSP is not working.
I never got any kind of sound from the speakers because the analog bypass or the "Straight" mode don't seem to work either.
What's the DSP flash memory? How can it be programmed? There's many videos on youtube where the just swap the old DSP chip with a new one and the receiver starts working properly. I mean, they don't program anything, they just change the DSP.
The errors you mention from the service manual is what I'm experiencing, "TI Bus: Boot" apparently means the DSP is not working.
Yes but if you've got no sound from the speakers even in analog mode, you've got other issues to worry about first.
