Aim:
Use tools and logic to detect and fix issues in a faulty circuit.

Requirements:

• Faulty PCB circuit (intentionally or accidentally not working)

• Multimeter

• Soldering iron & toolkit

• Safety gloves

Steps:

1. Check the power supply:
   • Use the multimeter to ensure the battery or power source is connected and gives voltage.

2. Look at orientation of components:
   • Check if the LED or capacitor is inserted the right way. LEDs have a longer leg for positive.

3. Test continuity using a multimeter:
   • Put the multimeter in continuity mode. Touch both ends of a soldered connection—if it beeps, the joint is fine.

4. Fix problems:
   • Resolder any cold or loose joints.

   • Replace damaged parts.

   • Make sure all parts are tightly fit in the PCB.

5. Test again:
   • Reconnect the battery and see if the LED blinks.