I bought this DC-DC Adjustable Power Converter Module, to convert 12V DC to 5V DC.
Initially it was working fine, but I connected IN- and OUT- pins to the each other and used it as a common ground for LED Display driver which takes both 12V and 5V as input but has one ground. After this it doesn't seem to work, the output voltage is stuck at 1.24V, no matter how much I vary the resistor which is there to control the voltage.
Can you help me find out what component I have damaged and how?
Edit 1: This is the schematic of my circuit:
The output of DC-DC converter is 5V, which is fed to the pin 3 of the Display driver, I have a major question regarding the connection of ground pins.
The Pinout for the LED Driver is here:
Datasheet for the driver can be found here.
I have questions regarding the ground of the display driver. There are two grounds, are both the same grounds? Should they be connected to the DC-DC converter input ground or output ground?