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Topics - Andrew_B

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Character LCDs / NHD-0216K3Z-FL-GBW-V3 outputting 5V on data pin
« on: December 04, 2016, 04:04:55 PM »
Hello,

I am using a NHD-0216K3Z-FL-GBW-V3 Serial LCD Module configured for RS-232 communication. Datasheet: http://www.mouser.com/ds/2/291/NHD-0216K3Z-FL-GBW-V3-35705.pdf

I have successfully transmitted data to the LCD using a PIC12 MPU (3.3V logic) on a breadboard. However, after soldering the components onto a protoboard, I discovered that my MPU was not functional and my LCD was outputting ~5V on its RS-232 serial data line (pin 1). There is no external connection between the data pin and the supply pin, so I suspect that there is an internal short-circuit that happened during soldering.

I have not been able to test the data communication because I have no extra PIC12s, but I'm willing to bet that a new PIC12 will break once it's connected to the 5V coming out of the LCD data pin.

So now I am trying to decide if I need to order a new LCD in addition to a new PIC12. Is there any reason, other than it being broken, that the LCD would output 5V on its data input pin? Thank you.

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