Sample ESPHome config for Waveshare 7 ESP32 Display

wave-7.yaml

# For Waveshare 7" ESP32 board.

substitutions:
  friendly_name: Waveshare 7

esphome:
  name: wave-7
  friendly_name: ${friendly_name}
  platformio_options:
    build_unflags: -Werror=all
    board_build.flash_mode: dio


esp32:
  board: esp32-s3-devkitc-1
  framework:
    type: esp-idf
    platform_version: 6.8.1
    version: 5.3.0
    sdkconfig_options:
      CONFIG_ESP32S3_DEFAULT_CPU_FREQ_240: "y"
      CONFIG_ESP32S3_DATA_CACHE_64KB: "y"
      CONFIG_SPIRAM_FETCH_INSTRUCTIONS: y
      CONFIG_SPIRAM_RODATA: y

api:
  encryption:
    key: !secret encryption_key

logger:
  hardware_uart: UART0

wifi: !include wifi.yaml

ota:
  platform: esphome
  password: !secret ota_password

ch422g:

psram:
  mode: octal
  speed: 80MHz

output:
  - platform: ledc
    id: backlight_output
    pin: 13
    frequency: 1220Hz
    inverted: true

# Note: this requires a hardware modification to work - GPIO 13 must be connected to the backlight PWM pad.

light:
  - platform: monochromatic
    output: backlight_output
    name: LCD Backlight
    id: lcd_backlight
    restore_mode: ALWAYS_ON
    default_transition_length: 0s
    gamma_correct: 1.8
    effects:
      - pulse:

i2c:
  sda: 8
  scl: 9
  frequency: 400kHz
  scan: false
  id: bus_a

button:
  - platform: safe_mode
    name: Safe Mode Boot
    entity_category: diagnostic

touchscreen:
  - platform: gt911
    address: 0x5D
    id: my_touchscreen
    interrupt_pin: 4
    reset_pin:
      ch422g:
      number: 1

display:
  - platform: rpi_dpi_rgb
    id: rpi_disp
    #update_interval: never
    #rotation: 90
    auto_clear_enabled: false
    color_order: RGB
    pclk_frequency: 16MHz
    dimensions:
      width: 800
      height: 480
    reset_pin:
      ch422g:
      number: 3
    enable_pin:
      ch422g:
      number: 2
    de_pin:
      number: 5
    hsync_pin:
      number: 46
      ignore_strapping_warning: true
    vsync_pin:
      number: 3
      ignore_strapping_warning: true
    pclk_pin: 7
    pclk_inverted: true
# 7" 800x480 params
    hsync_back_porch: 8
    hsync_front_porch: 8
    hsync_pulse_width: 4
    vsync_back_porch: 16
    vsync_front_porch: 16
    vsync_pulse_width: 4
# 5" 1024x600 params
#    hsync_back_porch: 188
#    hsync_front_porch: 44
#    hsync_pulse_width: 88
#    vsync_back_porch: 16
#    vsync_front_porch: 3
#    vsync_pulse_width: 6
# 4.3" 800x480 params
#    hsync_back_porch: 8
#    hsync_front_porch: 8
#    hsync_pulse_width: 4
#    vsync_back_porch: 16
#    vsync_front_porch: 16
#    vsync_pulse_width: 4

    data_pins:
      red:
        - 1         #r3
        - 2         #r4
        - 42        #r5
        - 41        #r6
        - 40        #r7
      blue:
        - 14        #b3
        - 38        #b4
        - 18        #b5
        - 17        #b6
        - 10        #b7
      green:
        - 39        #g2
        - 0         #g3
        - 45        #g4
        - 48        #g5
        - 47        #g6
        - 21        #g7

lvgl:

That did it @clydebarrow .....thanks. Backlight LED is now responding correctly.