4 inch display. How to control / slow down extremely annoying fan?

[mdrmdrmdr]

Just installed the 4 inch display on my Pi 4 for just console mode. Works very nice!

But, the small fan installed on the back side of the display is extremely annoying with a high frequency.

• Is it possible to control the rpm of the fan with software?
• Or is it possible to connect the fan to GPIO's and control it then with software?
• Might it be possible to add a resistor to the 5V cable to slow it down?

And an even bigger issue. When I do a shutdown --poweroff, the display and the annoying fan remains switched on! How to switch off the display and fan via SSH?

Thanks for any tips...

[mdrmdrmdr]

Got the information from the seller on Amazon, that to slow down the fan, the 0 (zero) Ohm resistor just above the fan connector on the board (R6) needs to be replaced with a 20 Ohm resistor. I'll report here if it works.

Update: Works perfectly fine. I soldered a 2 pin female header instead of the zero Ohm resistor. So I could try different resistors quite easily. I ended up with 33 Ohms.

[mowtschan]

@mdrmdrmdr could you share some picture of the screen please?

[mdrmdrmdr]

Currently I do not use the display. So can't show it running. But in the picture you see the soldered header and the 33 Ohm resistor. Hope this helps.