User manual

F1 LV EVALUATION PLATFORM
USER’S GUIDE
 2011 Microchip Technology Inc. DS41614A-page 35
Chapter 6. Troubleshooting
6.1 INTRODUCTION
There may come a time when you need to determine why your F1 LV Evaluation
Platform is not performing correctly. This chapter lists a few of the problems that can
prevent proper operation.
6.2 COMMON PROBLEMS
6.2.1 The board will not power up
Make sure the power supply jumper is populating the proper pins. Confirm the ISENSE,
J4, jumper is populated or an ammeter is connected. Then, go back and review
Chapter 2. “Getting Started” of this manual.
6.2.2 LCD is blank, but everything else works
The demo code in supplied with the F1 LV Evaluation Platform uses the Timer1
oscillator to drive the LCD. If the Timer1 oscillator is not oscillating, the LCD will remain
blank. Here are some steps to assure that the Timer1 oscillator is working properly.
1. Clean and dry the board especially around the components at the top right corner
of the PIC16LF1947.
2. Make sure no foreign material is shorting the crystal leads.
3. If you are using the RC0 and RC1 pins for some other function, you should
modify lcd_init to reconfigure the LCD peripheral for a different clock
source.
The Timer1 oscillator of the PIC16LF1947 is a very low-power design that can be easily
disrupted by stray leakage. In an actual application, Microchip recommends that the
crystal circuit be conformal coated to prevent leakage. Please review Application Note
AN1288, “Design Practices for Low-Power External Oscillators” for more information.