Screen issue (nothing appares)

Just assembled the uConsole. Fancy little machine.
But when I turn on the console (saw the green light so that the battery has juice). The screen wont appear anything (only a bit dim light like any other screen when you turn it on).
Is that something wrong? The first power on wont take 3 mins right?
Got the CM4 mode. Hope the screen wiring cable is fine.

BTW, when I press Fn + Print/H/J, I can hear a tweet sound. I think the mother board is ok?
Does the SD card contains any firmware?

But just fixed this uConsole issue after re-assembling it + reflashing the SD card. I think the old firmware in the SD card was corrupted!

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