Colors in LCD is lighter than TouchGFX design

[MiladChalipa]

recently, I am working on a project with STM32F746 and 9" LCD with GT911 touch panel, everything is working fine except the colors in the LCD appears lighter than expected in TouchGFX design! maybe something wrong with the settings So I uploaded some pictures about LTDC and TouchGFX settings. Any help would be grateful.

[MiladChalipa · Accepted solution]

@KnarfB​  @MM..1​ The problem solved. It was due to the lack of one of the TFT bias voltages on the PCB (Vgh). it had to be 17 volts but there was a failure in the boost converter chip, So replaced and now the LCD works correctly.

Thanks for your efforts guys.

For those who have the same issue:

1-Double check the TFT voltage biases (Vcom-Vgh-Vgl-AVdd-...).

2-if the bias voltage chips have an EN pin, make sure to enable the IC's first.

3-if there is the external ram (FMC), make sure to configure it correctly and double-check the color frame buffer in cubeMX to be correct (mine is 0xC0000000).