Blank Display on NHD‐C0220BiZ‐FS(RGB)‐FBW‐3VM

Comments

3 comments

  • Michael_L

    Since you're getting those voltages on pin 6 and 7, it seems that you have not successfully communicated with the display and issued the proper commands to turn on the booster circuit.  Also, the voltages on SCL and SDA are higher than the specification max limit for input high voltage (VDD).  At first guess, I would say this is the reason you are unable to communicate with the display.  Suggested pull-ups for SCL and SDA are 10kΩ on each line tied to 3.3V.  Also, what slave address are you using?  It should be 0x78 (or 0x3C shifted over one bit, for when you are using certain built-in I2C software modules such as the Arduino platform).

    VDD and VSS are not switched, they are in the correct order as indicated in the spec.  The display runs on 3.3V, not 5V.

    Lastly, have you referenced the code for this display I have posted here?: https://support.newhavendisplay.com/hc/en-us/community/posts/10667419773975-Problem-with-NHD-C0220BiZ-LCD

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  • SteveC

    Thank you for your reply! I will run some tests tomorrow and post my results.

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  • SteveC

    Hello Michael, Thank you for your suggestion. Changing the I2C address to 0x3C worked! I can see text on the LCD now. I'm sure we can make some progress now.

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