lektoren
Posts: 4
Joined: Wed Dec 16, 2015 10:09 am

Is my display dead?

Wed Dec 16, 2015 10:37 am

Hello, I'm a newbie here.

I have purchased a rasp Pi "bundle" from Max2play to use for a Squeezebox Hifi audioplayer.

http://shop.max2play.com/en/bundles/ras ... splay.html

I have followed the instructions here:

https://www.raspberrypi.org/blog/the-ea ... i-display/

.. but when the Pi boots the display is dead . On the video there is a red dot on the display, like on a tv - I don't see that either.

I use 5V/2A adapter for the Pi .

I have tried to power the display card from the Pi via miniusb

What am I doing wrong?

User avatar
hansotten
Posts: 343
Joined: Fri Jul 13, 2012 6:01 am
Contact: Website

Re: Is my display dead?

Wed Dec 16, 2015 11:35 am

I have tried to power the display card from the Pi via miniusb
Do it the other way around! Power the Pi from the display!
http://duinorasp.hansotten.com for Raspberry Pi and Arduino and ESP8266
http://retro.hansotten.nl for retrocomputing with the 6502 cpu

lektoren
Posts: 4
Joined: Wed Dec 16, 2015 10:09 am

Re: Is my display dead?

Wed Dec 16, 2015 3:15 pm

Thanks for answering - Now I have the adapter to the display and miniusb from display to Pi.

The Pi boots (red and green lights) - but dead display.

I don't know if you can make anything of the image?


https://www.dropbox.com/s/kjj7iq4dxasqp ... 8.jpg?dl=0



Cheers, Lars

6by9
Raspberry Pi Engineer & Forum Moderator
Raspberry Pi Engineer & Forum Moderator
Posts: 9522
Joined: Wed Dec 04, 2013 11:27 am
Location: ZZ9 Plural Z Alpha, aka just outside Cambridge.

Re: Is my display dead?

Wed Dec 16, 2015 3:41 pm

Do you still get output on the HDMI when the display is connected? If not, then the Pi has seen the display controller board and is sending data to it, but the wide connector from controller to actual display is probably misseated.
Likewise, the small ribbon cable which is for the touchscreen can be misseated, but that will probably only stop the touchscreen working, not the whole display.
Software Engineer at Raspberry Pi Trading. Views expressed are still personal views.
I'm not interested in doing contracts for bespoke functionality - please don't ask.

lektoren
Posts: 4
Joined: Wed Dec 16, 2015 10:09 am

Re: Is my display dead?

Wed Dec 16, 2015 7:38 pm

Thanks for answering.

HDMI gives signal from the PI with the display connected as on the image above.

This means the Pi doesn't see the display, right ?- so the ribbon cables must be connected wrong?

6by9
Raspberry Pi Engineer & Forum Moderator
Raspberry Pi Engineer & Forum Moderator
Posts: 9522
Joined: Wed Dec 04, 2013 11:27 am
Location: ZZ9 Plural Z Alpha, aka just outside Cambridge.

Re: Is my display dead?

Wed Dec 16, 2015 9:38 pm

Yes, if the HDMI is still active, then the GPU hasn't been able to talk to the display controller board over I2C.
Try reconnecting both ends of the ribbon cable from Pi to display to make sure they're square and secure.

For test purposes only, you could try enabling i2c_vc from boot/config.txt or raspiconfig, use raspigpio or wiringPi to set GPIOs 0&1 back to inputs, and GPIOs to alt0 (I2C). "i2cdetect -y 0" should then show up the display device addresses. You should get 0x38 and 0x45 show up if all is well.
Software Engineer at Raspberry Pi Trading. Views expressed are still personal views.
I'm not interested in doing contracts for bespoke functionality - please don't ask.

lektoren
Posts: 4
Joined: Wed Dec 16, 2015 10:09 am

Re: Is my display dead?

Sun Dec 20, 2015 11:31 am

Thanks for your help - flipping the ribbon cable did the trick - should have tried that earlier on...

Best, Lars

Return to “Official Foundation Display”