Deleted
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Post by Deleted on Mar 9, 2021 14:45:58 GMT -5
Current casualty on the repair bench is a Onkyo TX-NR808.
Replaced the TI DSP chip after an attempt at reflowing the original failed but it still shows ? ? ? for the DSP firmware, so I suspect Q3002, NAND flash is corrupt.
Does anyone have a firmware dump for this that I could load to get it going?
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Deleted
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Post by Deleted on Mar 10, 2021 7:26:19 GMT -5
Stuck on this one now...
TI DSP Q3001 replaced and loaded the replacement file into NAND Q3002 but still it shows ? ? ? in both DSP firmwares and no audio.
Tried talking to the RS232 port with my PC/PuTTy but that is silent too. On screen, the Network, Firmware and USB options are still unavailable.
Any suggestions welcome...
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Deleted
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Post by Deleted on Mar 10, 2021 12:22:45 GMT -5
Not looking good for this one... it appears my decision to replace the D830K013BZKB300 with a D830K013DZKB400 wasn't a good one. They are pin compatible but from what I now read, not interchangeable.
The NAND flash was corrupted as well, so reballing the original DSP may be a waste of time too as it has 17,000+ hours on it and is probably already dead or soon will be.
Replacement '300' series chips are no longer available, so like many other owners, I now have an 18Kg Onkyo paperweight |
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srt
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Post by srt on Mar 11, 2021 8:02:57 GMT -5
Did you check the crystal? What is the crystal frequency of DSP installed on HDMI board
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Deleted
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Post by Deleted on Mar 11, 2021 8:19:25 GMT -5
I haven't checked the crystal. With hindsight, this should have been one of my first checks when I tested the supply voltages.
Looking at the service manual, the 300 chip uses a 24Mhz one and the 400 uses a 20Mhz one. Perhaps this is why my replacement chip isn't running?
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Deleted
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Post by Deleted on Mar 11, 2021 10:47:39 GMT -5
Checked the crystal with a scope and there is no oscillation at either pin. I don't have a spare 24 or 20Mhz one to substitute, so had a look through some old circuit boards and found a 25Mhz one. I've put that in temporarily and there is still no clock signal there, so the DSP isn't running.
Also tried in turn linking the 19.66Mhz and 24.57Mhz crystals on the same board to the 1st DSP crystal pads but it still doesn't run, although I can measure a clock signal at that point now. Measuring across the crystal pads with a DMM shows 1.5 meg ohms, which I think is too high. I reflowed my new chip to eliminate a possible poor joint but it made no difference to this figure.
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Deleted
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Post by Deleted on Mar 11, 2021 19:00:13 GMT -5
Just noticed what I think is a big mistake on my part... I replaced my Onkyo DSP chip D830K013BZKB3 with a D810K013DZKB4 I'd bought as a spare for my Pioneer. Pretty sure the D830 and D810 aren't pin for pin compatible!
DOH!
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Deleted
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Post by Deleted on Mar 28, 2021 11:54:39 GMT -5
I tried fitting a D830K013BZKB4 in place of the now unavailable D830K013BZKB3 and fitted a new NAND flash with zero bad blocks using the firmware dump from the Polish website. The receiver remained silent and DSP firmware still stuck at at ?-?-?, so it looks like the '400' DSPs can't be fitted in place of the earlier '300' ones. I tried putting a 20Mhz crystal in place of the 24Mhz one too, but still nothing.
Spare HDMI boards are non existent, so this one will now get stripped for spares and scrapped off.
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