dimmbare backlight

I have a Mini2440 with 7" - LCD. In the datasheet of LCD it is located that
with pin 3 and PWM a dimmbare backlight is possible. Where is this
connection attached and/or available?

Hi

GPB1 can be connected to the LCD's dimming control.

To do that though R12 must be removed and R13 installed. This is on the LCD
adaptor board.

But doing this before configuring GPB1 will leave you with a blank LCD.

Thank you,
Errol