Backlight full control in CFA634

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New member

Is there a way to turn off the LED backlight completely? Sending \014\000 still leaves some light and does not turn it off completely as indicated in the datasheet. This occurs with the light power connected to the 5V LCD and the separate 5V LED supply. Short of having a physical switch on the 5V LED line I see no other way of turning the LED off.
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USB LCD Displays - Graphic and Character LCDs with a Keypad

CF Support


It appears that you have identified a bug in the firmware. On your suggestion, we have written a fix.

Please open a support ticket by sending an email to, mention this post in your email and we will get you taken care of as quickly as possible.

Thank You,
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