I am just looking for some advice so that I can be more certain of an issue before I try to fix it.
The issue is that a program I have downloaded to an Uno board is no longer working. To be more descriptive, the LCD display that I have connected is not displaying anything but the basic green light - there is a pot connected to a pin (forget which) which affects the contrast before anyone suggests that. Furthermore, the program doesn't appear to be working in any other respect.
I have checked the circuit in an attempt to identify the issue. In this process, I discovered that the supply was 15V: 3.5A, which I believe to be too much. I, therefore, suspect that the issue might be a broken voltage regulator - the one on the board is an AMS1117. However, there does not appear to be any obvious proof of this - whenever I have broken one in the past, there has been some obvious damage to the exterior of the voltage regulator. Furthermore, I am still getting a regulated 3.3V and 5V output of the necessary pins, so I'm now doubting if it is or is not broken.
If any knows of any tests that I can do to prove that the voltage regulator is broken or not and if anyone can suggest any alternative issues that would fit the bill, I would be vert grateful
P.S. Unfortunately I can't provide any diagrams or images of the circuit/board at the moment.