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Raspberry Pi 1.54inch LCD-Raspbian-Audio configuration tutorial

Download audremap18.dtbo to your pi
sudo cp audremap18.dtbo /boot/overlays/
sudo nano /boot/config.txt
Add this code
dtoverlay=audremap18,pins_18_19
(audremap18.dtbo just enable gpio18 as pwm audio pin,
This Above code will not enable gpio19 as pwm audio pin,
gpio19 have configured as key START)

Then you need reboot
sudo reboot 
After rebooting , You need enable local audio

sudo raspi-config  Select System Options -> Audio -> 'headphone'

Then reboot again use sudo reboot 

Set audio voice max and play any music then you will hear sound