I have a Rev H but I recently got a Rev E1b for my nephew's Christmas present. After adding the capacitor and ferrite bead to update to Rev F, I went ahead and prepped three of Borti's boards, installing one. It didn't work. Audio was almost inaudible, even with boosted MSU audio enabled.
It was very tough to remove without hot air but I managed and installed a second board. No change. I'm confident that both boards were assembled correctly and, yes, the chip was oriented correctly. The same ROM from the same SD card works fine on my original Rev H. Actually, it seems a bit TOO loud but that may be the specific ROM. It says "MSU old" in the file structure; is that boosted? Either way, if the mod was successful it should sound the same on both, but it doesn't. I checked all connections with a continuity meter. Everything is connected, nothing is shorted.
Does this mean I have a clone on my hands?
Pics:
https://imgur.com/a/iQmAS
I noticed JP401 was shorted on Borti's instructions but he didn't mention it and that seems to be a 0-ohm jumper on mine anyway.
I shorted JP341 per the Rev E1b advice in this thread (same place as FB342) though it seemed to be a 0 ohm jumper resistor in the first place. My original Rev H has a zero ohm resistor there even though it's labeled as a ferrite bead/inductor (FB342).