Before we talk about the advanced level of troubleshooting, let’s get a few things straight. First, Make sure your HDMI cable is not at fault. You can try it with another computer or another TV.

ESP32 GPIO27 → MAX98357A BCLK ESP32 GPIO26 → MAX98357A LRC ESP32 GPIO25 → MAX98357A DIN MAX98357A VIN → 5V MAX98357A GND → GND MAX98357A → Speaker (4-8Ω) ...