TFT Display power save

[vale-max]

Hi @rern ,
is there a way to set a power saving timeout (or a blanking screensaver) for the TFT display?

[ceejayemm]

Under Features / Others / Browser on RPi click on the cog wheel where there is an option to set a 'Screen Off' timer in minutes.

Chris

[vale-max]

Ok, so I tried the setting and it does blank the screen but the backlight does not turn off, so I did some investigation and found that the screen I bought on aliexpress differently from the screen in the article description has a LED_FUNCTION jumper, which comes hardwired to OFF.

I researched a bit and found this PDF on mouser which describes a TFT screen with some "LED_FUNCTION" wired to pin 15 (BCM_22).

So I took my soldering iron, removed the 1k SMD resistor shunting the OFF pads (making it fly and losing it), and soldered a 1k resistor on the ON pads, like in the pic below.

Now the backlight can be satisfactorily shut off or turned on with command "gpio write 3 0/1"

Further researches and found how to have a working /sys/class/backlight node, in this post (correct GPIO value is 22)

The problem now is that dpms off does not turn off the backlight anyways 😞

Until now the best candidate as solution seems this

Finally the image of the circuit side of my TFT screen with the huge resistor added by me.