I'm opening a new thread for this, since I have started it in another one. I have managed to update the firmware, and it completed it just OK. After opening it, and Tjmotter's suggestion, I have started checking for voltages and course I have found a few shorted pins, at the Q8302 Si HDMI IC. After I have removed this IC, the shorts are gone. Todd, I have a question, about this IC. The original one, on the board is a SiI9575CTU. In the SM it shows a different model number SiI9573CTU. Do you think, that these two are interchangable? I have some(2), on the 717 HDMI board. Another question, if this IC was shorted, could affect other parts of the board, and could mess up the firmware? Question marks could be caused by this issue?
Yes, from what I have read these two chips are pin compatible. My understanding is that the 9575 offers some advanced functions that the 9573 doesn't so this implies that you should be able to use a 9575 in place of a 9573 (I seem to recall having done this once) but it may not work the other way around if Onkyo is using any of those features.
Nothing in the HDMI section should affect the DSP firmware. They are completely disconnected however, both will use the 3.3V rail so if this chip is shorted and is bringing that voltage rail down, it could cause the DSP to not work. In addition to the DSP, the DSP RAM and DSP NAND both use the same 3.3V source.
Now that the HDMI chip is removed, i would install the board in the system to see if the DSP subsystem is working. Of course, clean the pads on the HDMI chip location first to make sure you don't have any solderbridges but otherwise it should power up (except for the HDMI subsystem).
The DSP is responsible for the firmware update so the fact that you have upgraded it implies that the DSP is working properly.
On the board I had the 9575, but in the service manual shows the 9573. I also have two 9573s. I shouldn't try installing these? So, if I would install the board now, the question marks it may disappear? How would I know, if the DSP subsystem works?
Yes, all BGA devices (including the Marvel video chip) can experience ball cracking. This continues to be a problem in all electronic industries since they moved to silver based solder to conform to RoHS (Reduction of Hazardous Substances - ie Lead) regulations. Look at any thread on XBOX or Playstation repair and you will see that this is almost always the issue. In fact, i recently repaired an old Compaq Tablet by reballing the video controller (NVidia).
Not sure if you need to reball both. The 2nd is a slave to the first (which is why you only see 1 DSP firmware level instead of 2). It could be the 2nd DSP but the main DSP should be the one that is loading the firmware so since the question marks show up in the diags, I would be more suspicious of the 1st.
I'm about to replace the SII chip and I'm looking up the PDF file, before the switch. I have noticed the difference between the two versions. The 9575 has a ViaPort Matrix Switch, which I still don't know, what it is. The 9573 shows, that it is just as standard device. It is just weird, that the schematics show the 9573 and on the actual board, there is a 9575. Man, these chips are super hard to remove. I'm even wondering, if this chip is still good, after so much heat that was applied and it will be applied to it.
I have reheated both DSPs and the question marks are gone. Replaced the SII chip and I have Menu output on the screen, but nothing via HDMI inputs. I will have to look again, at my soldering job. I thought, that I did it pretty well, but you never know.
I looked at the schematic again. It appears that Onkyo may have simply re-used the HDMI section from a different model because if you search for this device (Q8302) in the device list (at the bottom of the service manual), it clearly calls out the 9575. As I said before, the two parts are pin compatible but the 9575 has some additional features. Since it doesn't work, this suggests that you are going to need to find a 9575.
Hi, Any luck tibimakai? I'm still waiting for my programmer to arrive. In the meanwhile I was working on my 646, but that doesn't go well either. I will open a new post and tell about it coming weekend
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