I am using a PC2002LRU-BWB-H-Q LCD with a STM32F4 micro and is powered through a TMP10424. There is also some 3V3 and 5V modules to. The problem is that the LCD is displayed fine for over days and then suddenly it stops to display. This may be down to power surges and thought the MCU was hanging. I added a watchdog to reset the MCU if it did hang.
The MCU seems to be fine because there is data coming from the UART and some Led's are toggling as they should but noting on the LCD. There is Light on it just no characters.
Also, I did notice that if I was probing the UART that it stopped displaying characters so it could be some sort of grounding issue, but the micro which is probably more sensitive is fine. I have 2 units set up so its not this particular LCD, the other one also stops displaying characters.
Is this a common problem with anyone?