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LCD Flash during startup of ezLCD-5035 #29

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microlan opened this issue Jun 5, 2022 · 2 comments
Open

LCD Flash during startup of ezLCD-5035 #29

microlan opened this issue Jun 5, 2022 · 2 comments
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microlan commented Jun 5, 2022

Describe the issue
Flash of LCD backlight during power on; caused by missing pulldown resistor on backlight PWM Signal

Expected behavior
No flash

Board Information:

  • SOM Revision: Rev B
  • Personality Board Model/Revision: 5035 / Rev A2

Additional context
Also causes random M/A power supply shutdown during power on
@microlan microlan self-assigned this Jun 5, 2022
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microlan commented Jan 6, 2023

Add 220 ohm pulldown on LCD_PWM

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microlan commented Jan 9, 2023

Check on the value (220 ohms seems a bit low--might load down the CPU too much?)

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