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Moonlander Keyboard vs. Board Chow
The Moonlander keyboard has per-key LEDs that I’ve denatured enough that most show a pale gray, with a few others highlighted in orange. A few weeks ago the LEDs on the right-hand thumb cluster and the
Nkey went nuts, cycling through a surprising assortment before settling on bright red; the obvious resets / firmware reflashing / tapping were all unavailing.ZSA’s tech support recommended taking the thumb cluster apart to check the ribbon cable connecting it to the main keyboard half:

Moonlander thumb cluster – PCB bottom Come to find out my unclean personal habits lodged a particularly corrosive nugget of board chow on the cable:

Moonlander – corroded ribbon cable It’s a more-or-less standard 0.5 mm pitch cable, but only 20-ish mm long, much shorter than the cables carried by the usual sources. ZSA sells them for $2 each, plus $25 courier shipping, so I bought three; they arrived in two days from halfway around the planet.
Because I don’t foresee my personal habits changing any time soon, I tucked a Kapton tape snippet in the gap to serve as a gutter:

Moonlander thumb cluster – tape shield installation That’s with the two hinge screws out and the cluster eased down-and-away from the keyboard enough to get the tape pressed against the keyboard.
With the screws installed and the cluster at its normal most-downward angle, the gutter closes up:

Moonlander thumb cluster – tape shield folded With the cluster in its normal operating position (for me, anyway), the gutter is nearly invisible:

Moonlander thumb cluster – normal position For the record, I tucked the remaining ribbon cables inside the left-hand thumb cluster against future need.