My XG YAMAHA MU10 worked fine around 7 years ago when I last used. It has sat in storage with nothing irregular happening to it. I have only used the official PA-3B AC adapter.

Now it does not work. Power light never turned on. I went to open it to check contacts, traces, etc. However, there are two PCBs attached via a ribbons cable. The bottom one is screwed in place, and I cannot easily access the screw without elevating the other board. Both boards are seemingly attached with an outer layer of "gold foil". I think it is RF shielding. If I separate the solder points circled in my photo, I think I would have ease inspecting and servicing the device.

I think I would rather just cut it.

What is this foil wrapping? Is it necessary?

I may continue this thread with discussions on capacitors if that is what I decide to service.