Rpi and Av cable

[smCRO]

Hi guys
I have problem connecting my raspberry pi with av cable. Cable is not broken i checked it, rpi in not broken ether it is working while is connected with hdmi. So is there any switch to av or something. I red something like disabling hdmi, but is there any other way to enable av output. Guys tnx for help and sry for my bad eng.

[DeeJay]

I believe the RPi will default to using HDMI if it senses a device connected, so the first thing will be to disconnect any hdmi cables and leave only the AV/RCA 'yellow video' cable connected.

Even if you don't want to use it as the installer, I suggest downloading the NOOBS-lite (network only) installer. It is only a 20Mbyte download.

Use that to boot your RPi. It has the option to select different video modes by a single keystroke. That should allow you to prove that the RPi av output is working correctly. See the documentation here.

Display Mode Selection: By default, NOOBS will output over HDMI at your display's preferred resolution, even if no HDMI display is connected. If you do not see any output on your HDMI display or are using the composite output, press 1, 2, 3 or 4 on your keyboard to select HDMI preferred mode, HDMI safe mode, composite PAL mode or composite NTSC mode respectively.

Once you are confident that the RPi and display are working you can return to your chosen Operating System knowing that it is possible to edit the /boot/config.txt file to enable your composite display. See the documentation here for details of the options.

[smCRO]

So you say that i should download noobs lite (will 2gb card be problem) and run it with av cable connected only. Than connect with hdmu? And then i need to select av video mode and then put card with already installed os.
I used noobs 1.** gb file and i instaled rasp... and while trying to connect via av hdmi wasnt insered in rpi.
Thx dude ill try

[DougieLawson]

You need a 4GB card for NOOBS.

Try this in /boot/config.txt:

Code: Select all

# uncomment for composite PAL
sdtv_mode=2
sdtv_aspect=3

I've left that set even though my RPi is normally connected to a HDMI TV.

[smCRO]

Guys i think that i havent understand you fully. Can i change display settings directly in rasbian or?
Guys sry for nooby questions i am totaly beginner without perfect knowledge of english so :/

[DeeJay]

Can i change display settings directly in rasbian or?

Can i change display settings directly in rasbian? Yes. As DougieLawson has said, you can edit /boot/config.txt from Raspbian to make the changes he suggests.

Or? Or you can use the NOOBS Recovery Console (hold Shift when prompted at boot time), which has a Configuration Editor that can change the config.txt file for your installed Operating System. See https://github.com/raspberrypi/noobs#ea ... ile-editor

In either case you will need to reboot the system after making and saving the edits for the changes to take effect.

[smCRO]

Guys i did that but than i have to hold shift to enter boot - noobs and then i finally got picture until than tv has no signal and then when i click exit black screeb again and tv saids no signal again :/
Solution ? ?

[DeeJay]

Guys i did that but than i have to hold shift to enter boot - noobs and then i finally got picture until than tv has no signal and then when i click exit black screeb again and tv saids no signal again :/
Solution ? ?

you can use the NOOBS Recovery Console (hold Shift when prompted at boot time), which has a Configuration Editor that can change the config.txt file for your installed Operating System. See https://github.com/raspberrypi/noobs#ea ... ile-editor

Use that editor to make the changes that @DougieLawson has suggested.

[smCRO]

Yeah but that happened after i changed
# uncomment for composite PAL
sdtv_mode=2
sdtv_aspect=3
In edit config!

[Burngate]

There seems to be some confusion here.

To answer your original question, yes, there is a switch, in software.
Normally on boot-up, if the Pi detects a HDMI monitor it switches to using that; otherwise it uses composite - what you are calling av.
But the switch can be forced to one or the other by lines in the config.txt file in the first partition of the SD card.

NOOBS was designed to be easy to use, and assumes HDMI. It forces HDMI unless you deliberately switch to composite - and then doesn't tell the OS's about it unless you deliberately make it do so.

SO:

You were using Rasbian or one of its derivatives and couldn't get the composite video to work.

After loading NOOBS, you got - briefly - the composite to work.
That proves there's no hardware fault.
So there must have been a software problem on your original set-up. Probably in Config.txt.

So go back to your original set-up, and look again at Config.txt
- You can see it if you look at your SDcard in a Windows machine, or on the Pi itself at /boot/config.txt

You've tried

Code: Select all

sdtv_mode=2
sdtv_aspect=3

There are other things in that file that may be causing you problems - there may be lines such as

Code: Select all

 hdmi_force_hotplug=1

that need to be commented out or just removed

[smCRO]

Tnx guys i did what suggested me i changed confix text and i thought that i need just to reboot but all i needed to do is to reinstall os and after that everything worked just fine. Ps is needed to press num 4 to switch to rca mode?