The S/PDIF input board info doesn’t mention the V4 amp, but looking at the comparison table it does appear that it’s compatible.
Looking at a picture of the V4 it shows that the S/PDIF is located in connector J13 along with the I2S out (same as the Mini and Pro boards) so I would be pretty confident in saying that using the 7 pin lead and plugging into the ‘For Mini V3/Pro V3’ would work.
②Up2stream Amp V4/Mono, Up2stream Amp2.1 & Up2stream Plate Amp need ACPWorkbench tuning tool to switch the spdif configuration from spdif in to spdif out
Nope, according to additional youtube video I have seen it was not required. The S/PDIF is by default IN. So are you saying that I need to change to S/PDIF out? The TV sends the output to the expansion board. Support never mentioned anything about this…
In addition, another strike against the optical feed does not do volume control.
However, most new TVs now support HDMI ARC or e.ARC, which allows volume control directly from the same TV remote control for simplicity, so I think that I can purchase a USD $20 HDMI ARC device and have it output to the line in of the Amp V4 board and have volume control and achieve the same thing but not on optical…
First, please try to check the silk print on the SPDIF board, just make sure it’s a IN board, because these 2 looks very same, and might you’ve ordered wrong board or we might delivered wrong product in mistake.
And another point, please check the PIN name on each board, and see if they are connected relatively, because the wires might have wrong direction.
3rd, you could try to disconnect the PINs for I2S, it might affect the SPDIF transferring.
That’s what I’ve thought to check, and there’s no magic, just make sure the signal reached to the chip, and it will work. good luck