I did not find anything lose, so I have placed an order for a new chip. I'm noticing, that there is another SiI chip on the board, which is much smaller in size, then the one we talking about. It seems, that it is for the HDMI output, judging by it's traces.
OK, finally the HDMI ICs came in and replaced it, double checked it and it is soldered well. My first drag soldering went well, except the beginning and the end, where I had some joint pins, but after using wick it is all loking good. The problem is, that there is still no audio and video. One weird thing that I have noticed in the Onkyo's menu, that (this receiver should have four HDMI 2.0 inputs and on my receiver) only shows HDMI 3(Strm box HDCP 2.2) it is HDMI 2.0. Once, I have managed to get a resolution mismatch warning message to show up, on that input. What do you think that it could be the problem? Bad ICs? I haven't measured anything yet.
Last Edit: Jun 16, 2020 0:53:06 GMT -5 by tibimakai
Hard to say if the chip has been erased but I have seen this in the past. In fact, the SR-607 (IIRC) was famous for the fact that when the capacitors failed, they caused oscillation on the voltage rails and the OSD firmware chip interpreted that as an "erase" command. The only way I know to check it would be to connect a to a programmer and then check to see if it has code on it. If you need it, I should be able get you a copy of the correct firmware for this chip.
Last Edit: Apr 14, 2022 11:04:56 GMT -5 by tjmotter
We are talking about Q8305 which supports the SII9575CTU chip by providing the necessary firmware. To be honest, I don't know exactly what this firmware does but you will find it on the board.
The thing with HDMI3 is that it is the only input on this that supports HDCP2.2. That is why this port isn't managed by the 9575 and instead runs from Q8401. Note that the "MAIN" output has a similar device to support HDCP2.2 but the "SUB" doesn't. Have you tried connecting your TV to the "SUB" port and the HDMI input to anything other than HDMI3 to see if they sync?
To explain further, HDCP2.2 provides copy protection. This usually means the device has some type of encryption/decryption capabilities internally. When the NR838 was released, this was new technology so rather than install it on every HDMI port, they only installed it on two: HDMI3 for input and MAIN for output. As such, HDMI3 is serviced by Q8401 (SII9679) and MAIN is serviced by Q8402 (SII9678). MAIN is able to switch between HDCP2.2 mode and normal mode so that it can handle all output functions. To narrow this down, I would recommend that you bypass MAIN and instead use "SUB". The "SUB" port is the more "normal" HDMI out port and is directly connected to the 9575
It occurs to me that you might be able to update the firmware by simply forcing a firmware update. I seem to recall (it has been a long time so don't quote me), that the HDMI subsystem is updated as part of the process.
Sorry about not answering sooner, but I haven't check the forum for a few days. I will have to check output at the SUB, when I get home. Can I install the same firmware, over the other? Will it take it? I will try that too. Thanks Todd.
Side note: I have picked up TX-RZ810 that seems like it was dropped(no damage from outside though, or maybe they couldn't remove the board and they have pulled on it), the whole mainboard has a big crack in the middle. Man, there are so many traces that have to be re-soldered, some connected with wires, to strengthen the board.
If it makes you feel any better, I was bored so I picked up an RZ820 off eBay that was missing the HDMI board. I have an HDMI board here that I bought to steal the two HDMI chips to fix an NR656 so I figured I would just dust it off, put 2 new chips in and repair anything else I found. The pictures showed a good main board but the seller shipped the unit without any screws installed on the heatsink. Needless to say, the board snapped in half. I thought about using crazy glue to repair the board and then try to rebuild the traces but then I decided against it. I didn't notice when I placed the order but the pre-amp board was missing so rather than try to scout for a new one I did a bit of research and found that Onkyo used the same Main board and pre-amp on the NR656 and the RZ820. I found a dead NR656 on ebay for cheap because not only does it not work but there is some physical damage so I bought it. It appears that I can remove the Main Transistors, install some upgraded caps (higher voltage), add a couple of pre-amp transistors and move the Z2 circuitry between the two boards. I hope to end up with a nice working RZ820. I will let you know how it works out.
The key thing this illustrated to me is just how far Onkyo has gone to reduce costs. Sharing of boards between models this different was surprising.
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