Consumer electronics troubleshooting and repair handbook

What is troubleshooting in electronic device?

Troubleshooting is a systematic approach to problem-solving that is often used to find and correct issues with complex machines, electronics, computers and software systems..

These are the things I check before diving deep into troubleshooting a circuit:

1. Does the PCB or breadboard match the circuit diagram?
2. Does the circuit have power?
3. Is the circuit getting the correct voltage?
4. Is the power supply connected the right way around?
5. Are all ICs, transistors, and diodes the correct type?