STM32F746BGT6 (LQFP208) 10" LCD Flickering Issue

[hari0369]

Hi Folks,

I’m currently observing flickering on a 10" TFT LCD screen and would appreciate some expert advice regarding the connections for LCD_CLK, LCD_HSYNC, and LCD_VSYNC.

At present, the signals are connected as follows:

1. MCU LCD_CLK → Non-Inverting Buffer IC → 22Ω series resistor → 300Ω @ 100 MHz Ferrite Bead (1 signal line) → LCD LCD_CLK

2. MCU LCD_HSYNC → Non-Inverting Buffer IC → 300Ω @ 100 MHz Ferrite Bead (1 signal line) → LCD LCD_HSYNC

3. MCU LCD_VSYNC → Non-Inverting Buffer IC → 300Ω @ 100 MHz Ferrite Bead (1 signal line) → LCD LCD_VSYNC

Could anyone please advise whether the flickering could be due to:

• Incorrect ferrite bead selection or signal integrity issues?

• Potential hardware-level filtering/matching concerns?

• Or something that may need to be addressed in software configuration?

Any guidance, suggestions, or debugging tips would be greatly appreciated.

Thank you in advance!

[Tesla DeLorean]

Hard to know, have you got video that's illustrative of the specific nature of the issue?

Backlight?

Settings?

Memory Bandwidth?

Resolution? 1280 x 768 is about the ceiling with 32-bit SDRAM @ 100 MHz