Wii 变砖，有解决办法吗？

Any solutions?! Thanks

Without entry point for starting any software this is tough. With Priiloader or BootMii in boot2 you could start trying things (and most likely copy saves if still readable)
If it does sit stable at H&S screen you could try BlueBomb. Remote syncing and being able to shut down suggests Bluetooth is working.
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A launch day Wii has the vulnerable boot1. Technically it is possible to install BootMii into boot2 with a hardware flasher (advanced soldering).

Oldest Wii units have a known problem with a voltage converter (symptom there was absolutely no signal, but who knows). Also the NAND chips are really old by now. They might become bad or just lose data (Data retention time on long inactivity). I've seen one thread with a definitely defective NAND (complete failure even with brand new image) while EmuNAND method brought it back to life. Having homebrew software installed is crucial for longevity.

Good luck!

Can any expert on here confirm (more so) that at this point I'm facing more of a software issue/brick rather than a hardware failure? The Wii is currently disassembled... any other hardware components to troubleshoot?

Putting something away in working condition and taking it out again not working suggests some kind of hardware failure (unless somebody else messed with this without you noticing).
Finding the exact issue will be tough. You already ruled out the obvious: Swapping removable parts (BT, WiFi, optical drive) is a smart move.

Software wise there is not much you can do. Again: Try BlueBomb.