how to turn-off the STM32F429 Disco kit's lcd ?

[Carter Lee]

Posted on September 07, 2017 at 03:03

HI,

I'm currently test the STM32F429 Disco kit with some example on step by step.

But I nerve that LCD always turn on, So Is there any way to turn off the lcd ? because I'm not ready to test the LCD.

[Tesla DeLorean · Accepted solution]

Posted on September 07, 2017 at 03:33

Review the schematic with respect to the back-light. Remove R47 thru R50

http://www.st.com/content/ccc/resource/technical/document/user_manual/6b/25/05/23/a9/45/4d/6a/DM00093903.pdf/files/DM00093903.pdf/jcr:content/translations/en.DM00093903.pdf

 

[manurp]

Sorry to bring back an old topic, but by that, do you mean to actually desolder the resistors from the board?

I would have thought that there was a more elegant way to go about disabling the screen, through software pinout configs i.e.

[Uwe Bonnes]

yess, you need to desolder. Board designers did not implement that connection.

[waclawek.jan]

No, backlight to the LCD can't be controlled from software.

But it actually does not make any harm to leave it on, it just may be annoying.

Logic/pins collisiton is another thing: check the ILI9341 datasheet to see which pins are output only, and which are in/out; you should not use mcu pins connected to the former (probably only TE and SDO), but you can use pins connected to latter (most other pins) as long as you keep CSX high.

JW