TiiGx
Posts: 4
Joined: Wed Sep 02, 2020 6:04 am

Can't get 3.5" LCD to work with Pi 4

Wed Sep 02, 2020 6:19 am

Hey guys!
I am a Raspberry newbie! Got my first raspberry PI 4 4 GB. And after I installed the OS. And after I connected my raspberry to my keyboard, mouse and monitor, i wanted to activate my 3.5 LCD RPI screen.
So i do exactly as the instruction told me to do. But after i finish the commands my monitor turns black and my LCD is still only white. i tried to do it 4 times and i restarted it several times. But it still doesnt work. Help me! I pull my hair out soon! :(

Best Regards!

RGJ-PI
Raspberry Pi Engineer & Forum Moderator
Raspberry Pi Engineer & Forum Moderator
Posts: 156
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Location: Cambridge UK

Re: Can't get 3.5" LCD to work with Pi 4

Wed Sep 02, 2020 9:49 am

What make and model 3.5" LCD are you trying to use?

TiiGx
Posts: 4
Joined: Wed Sep 02, 2020 6:04 am

Re: Can't get 3.5" LCD to work with Pi 4

Wed Sep 02, 2020 10:02 am

It says 3.5" LCD RPI on the back. i bought kit B on the link below.
https://www.ebay.com/itm/Raspberry-Pi-4 ... 2749.l2649

TiiGx
Posts: 4
Joined: Wed Sep 02, 2020 6:04 am

Re: Can't get 3.5" LCD to work with Pi 4

Fri Sep 04, 2020 4:42 am

Help please! :/

PhilE
Raspberry Pi Engineer & Forum Moderator
Raspberry Pi Engineer & Forum Moderator
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Location: Cambridge

Re: Can't get 3.5" LCD to work with Pi 4

Fri Sep 04, 2020 8:26 am

1. What instructions have you followed? Don't make us guess.
2. What is in your config.txt file?
3. What do the following commands return:

Code: Select all

$ uname -a
$ vcgencmd version
$ sudo vcdbg log msg
$ raspi-gpio get
$ dmesg

TiiGx
Posts: 4
Joined: Wed Sep 02, 2020 6:04 am

Re: Can't get 3.5" LCD to work with Pi 4

Tue Oct 06, 2020 10:53 am

I followed the instructions and wrote the commands in CMD that followed with the screen. The commands you just wrote? What are those for? I am a total beginner with raspberry PI.

PhilE
Raspberry Pi Engineer & Forum Moderator
Raspberry Pi Engineer & Forum Moderator
Posts: 3450
Joined: Mon Sep 29, 2014 1:07 pm
Location: Cambridge

Re: Can't get 3.5" LCD to work with Pi 4

Tue Oct 06, 2020 11:00 am

I followed the instructions and wrote the commands in CMD that followed with the screen.
That's great for you, but I can't see the instructions so I've no idea what you've done. You should at least be able to open a Terminal window (or CMD as you call it) and type

Code: Select all

grep -v -E "^(#|$)" /boot/config.txt
and show me the output.

The other commands I listed are my attempt to determine what state your system is in, looking for error messages and other clues.

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hansotten
Posts: 357
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Contact: Website

Re: Can't get 3.5" LCD to work with Pi 4

Tue Oct 06, 2020 11:28 am

The ebay url has a simple instruction:

Before you use screen, you need to install a driver for the screen in your system

And that is it. :D :( :o Typical ebay seller!

You could try to ask the seller for support, I hope but doubt he will be able to.
http://duinorasp.hansotten.com for Raspberry Pi and Arduino and ESP8266
http://retro.hansotten.nl for retrocomputing with the 6502 cpu

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