See schematic and troubleshooting below :
- Supply voltage.
- IC Damaged or installation inverted.
- Component damaged .
- Installation components inverted.
- Line break PCB.
- Input not connected or input connect to ground.
- Output speaker not connected.
Electronic Circuit is a good site for hobbyist also who would like to try DIY because it shared good circuits. If you have a personalized circuit requirement you may feel free to request it through the comment box or contact me.