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@Gordon
I2C timeout basically means at the lowest level, the Pico can't get a response off the display at the given address. So it's almost certainly some wiring issue (or a broken display)
Are you connecting to
BatorVccwhen you're trying to get 5v?Batwon't have anything on it (it's the battery input) butVcc(the one next to 3.3v) will have around 4.5v (5v plus diode drop).Are you using the 0.1" pins, or the small connector? It looks like the 0.1" pins might not be connected to the same things as the small connector (so might not have I2C on them).
Also, are you sure SDA and SCL aren't mixed up? I always end up doing that :)