- Edited
When I pressed google on why they needed to do a factory reset, they eventually told me that they often find the blank screen issue is associated with the motherboard.
I won't pretend to know anything substantial about repair, but replacing the motherboard is definitely the nuclear option. If a repairer can obtain replacements for the affected parts soldered to the motherboard, they should be able to do board-level repair. OEMs tend to take the easy way out and replace whole components. Third-party repairers are often more willing to do this type of repair, because they're the second option after an OEM has failed customers.
Again, I don't know much, but I'm pretty sure this is accurate. It's worth a shot, at least.