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CFA633 contrast


New member
I'm having a problem with the CFA633-TMC-KS store. The problem is that the store do not save the contrast that I changed. I see that the store is working because all other parameters like backlight and characters returns to there pre reset valus but the controst returns to some default value.

This problem occurs only in CFA633-TMC-KS (blue display) but in CFA633-YYB-KS (green display) it works fine.

The HW FW version in the CFA633-YYB-KS (green) is "CFA633:h1.0,b0.6"

The HW FW version in the CFA633-TMC-KS (blue) is "CFA633:h1.0,a0.7"

Eran Gez
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CF Tech

Those are both pretty early firmware versions. I think the v0.6 was the first firmware version released.

I would have to check, but my first guess would be that there is a bug related to storing the contrast in the v0.6.
USB LCD Displays - Graphic and Character LCDs with a Keypad