Dugger
Posts: 6
Joined: Wed Mar 25, 2015 3:18 am

Powering the 7" Display

Mon Oct 19, 2015 10:20 pm

Just got my new Raspberry Pi 7" touchscreen display. I have tried to power it from the uUSB marked PWR in but it does nothing however it does work when powered from the 5 pin header. Is this normal? Is there a schematic available?
Thanks.
Doug G
http://strident.co nz

W. H. Heydt
Posts: 10577
Joined: Fri Mar 09, 2012 7:36 pm
Location: Vallejo, CA (US)

Re: Powering the 7" Display

Mon Oct 19, 2015 10:58 pm

I power mine through the microUSB connector.

Dugger
Posts: 6
Joined: Wed Mar 25, 2015 3:18 am

Re: Powering the 7" Display

Tue Oct 20, 2015 2:13 am

The micro USB connector seems to do nothing on mine maybe I should send it back. When you power it from the micro USB how are you powering the Pi from another supply, the USB in or the jumper leads?

Thanks
Doug G
http://strident.co nz

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hansotten
Posts: 324
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Contact: Website

Re: Powering the 7" Display

Tue Oct 20, 2015 6:54 am

I power the displayboard via the micro USB labeled PWR IN. 5V 2A supply!

And then power the Raspberry Pi via a an USB cable from PWR OUT on the display board to the PWR IN on the Raspberry Pi.

The cable I use is a short one from ebay.
This way nothing is blocking the GPIO connector.

See more photos of my setup here.

Image
Last edited by hansotten on Tue Oct 20, 2015 12:19 pm, edited 1 time in total.
http://duinorasp.hansotten.com for Raspberry Pi and Arduino and ESP8266
http://retro.hansotten.nl for retrocomputing with the 6502 cpu

gadgetoid
Posts: 152
Joined: Wed Mar 07, 2012 9:58 pm

Re: Powering the 7" Display

Tue Oct 20, 2015 10:28 am

Do you have an additional, separate power supply to try powering the LCD from?

It's possible that your cable is bad, and there's simply too much voltage drop across it for the Raspberry Pi to fire up, which means the LCD display is never going to show any signs of life.

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