White line on the LCD display

TFT LCD: 480 x 272
It looks like there is a line on the LCD.
I tried adjusting the LCD timing parameters (vsync, hsync) from minimum to maximum, but it has no effect.
I thought it was a problem with the LCD itself, but when I displayed the basic color, the line disappeared.
I would appreciate it if you let me know where to look.!

I could be a pixel clock issue too. Try to increase or decrease it. Also be sure the polarities are correct.