NHD-0420D3Z-FL-GBW-V3 Backlight
Hi,
I'm using the NHD-0420D3Z-FL-GBW-V3 using I2C and 5V 5A power supply.
I also use the command 0x53 to set backlight contrast to maximum.
My problem is that sometimes (about 5%) when I power on the device the backlight is OFF. In such cases I need to use it the next day when the backlight is ON again.
Can you advise ?
Regards
Theodore
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Official comment
Hi Theodore,
If you have the data lines powered before supplying the main supply of the display, this may cause irregular behavior on occasion. Additionally, adding a delay at the start of your initialization sequence will help the power supply to settle.
You mentioned that the backlight is on the day following turning the display on. Do you mean that the backlight turns on after a certain time after starting with no backlight? Also, If you power cycle your device, does the backlight turn back on or continue to stay off?
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Hi,
I added a delay and waiting for the results.
Forget my statement about the following day.
When the problem appears If I power cycle the device problem remains. Problem disapears after unknown times of power.cycling the device.
Regards
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Hi Theodore,
Thank you for the additional information, and I hope that the addition of a start-up delay solves your issue. Just for clarification, do you that the issue is still present when soft resetting or when the display is reconnected after being fully disconnected the system's supply?
Please let me know if you have any additional questions. Otherwise if you have concerns about your code, the linked example LCD code is a great resource for the NHD-0420D3Z-FL-GBW-3V.
https://support.newhavendisplay.com/hc/en-us/articles/5902187111191-Serial-Interface-LCD-with-Arduino0
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