But these are not problems in the bulb sockets or the LED's themselves. It's the wiring. So it makes no difference whether the bulb can be replaced or not.
This is the way it is with LED's. It's no longer the bulbs that blow, but the circuitry that goes bad. Every new LED sign that goes up in Times Sq. (and there seems to be new ones going up every few months; especially with the new buildings being built and finished), the next time I see it; patches are malfunctioning. It's not the diodes, but the probably the circuitry. I guess with the LED's giving off no heat, the circuitry is more likely to freeze or be damaged by wet weather, etc.