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  What should I do with the garbled screen on startup for LCD character modules?

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  How to control the module's contrast?

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  After installing the module, the contrast is not good enough. There is no VR on the module to control the contrast. How to adjust it?

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  I want to use my own VEE, but the module I choose is without VEE. How can I decide the VEE value? How to connect it?

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  The controller is 7920 IC. What are the pins defined when it is working on SPI mode?

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  Character STN type module doesn't have the appropriate letter in the Font Table; how to create my own CGRAM?

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  How to make the backlight power "ON" while the module turns ON? How to make the JUMPS, and are any limitations?

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  Character type: What if I want to use VEE and turn on the backlight from PIN15 and PIN16?

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  Can I use 5V to light the backlight?

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