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nerd7473
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Powering a 7" 9v LCD display from 5v

Wed Mar 05, 2014 7:26 pm

I want to power a lcd for a project but I want the battery to power both the pi and the display I have rca input and it runs on 9v to 12v at one amp. Is there anything I can use to boost the voltage and amperage?
nerd7473

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alexeames
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Re: Powering a 7" 9v LCD display from 5v

Wed Mar 05, 2014 9:50 pm

Does your display actually need 9V or is it regulated down somewhere on the board?
If not, you might be able to hack it and run the whole lot from 5V.
Alex Eames RasPi.TV, RasP.iO

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nerd7473
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Re: Powering a 7" 9v LCD display from 5v

Thu Mar 06, 2014 2:34 am

alexeames wrote:Does your display actually need 9V or is it regulated down somewhere on the board?
If not, you might be able to hack it and run the whole lot from 5V.
It says 9v-12v at 1a at 2.5a max so I have no clue
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nerd7473
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Re: Powering a 7" 9v LCD display from 5v

Thu Mar 06, 2014 2:38 am

alexeames wrote:Does your display actually need 9V or is it regulated down somewhere on the board?
If not, you might be able to hack it and run the whole lot from 5V.
I have no idea if it is regulated down the board or not
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Re: Powering a 7" 9v LCD display from 5v

Thu Mar 06, 2014 2:46 am

Here is a thread about converting a small screen to run on 5V. You would really have to know what you are doing to accomplish this:
http://www.raspberrypi.org/forum/viewto ... 1&start=75

Generally is is much easier and more efficient to step down DC voltage than to step up. If it were me I would use a 12V battery for the screen and then step down to 5V for the RPi using a 'buck' or switching type regulator.
You can get a simple cheap converter by using a car USB adapter with a 12V battery.
Unless specified otherwise my response is based on the latest and fully updated Raspbian Buster w/ Desktop OS.

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nerd7473
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Re: Powering a 7" 9v LCD display from 5v

Thu Mar 06, 2014 1:00 pm

klricks wrote:Here is a thread about converting a small screen to run on 5V. You would really have to know what you are doing to accomplish this:
http://www.raspberrypi.org/forum/viewto ... 1&start=75

Generally is is much easier and more efficient to step down DC voltage than to step up. If it were me I would use a 12V battery for the screen and then step down to 5V for the RPi using a 'buck' or switching type regulator.
You can get a simple cheap converter by using a car USB adapter with a 12V battery.
I would rather use the buck converter because I am making a raspberry pi laptop I am almost done with the bottom half except for a battery
nerd7473

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nerd7473
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Re: Powering a 7" 9v LCD display from 5v

Thu Mar 06, 2014 10:08 pm

I would like to say that I have posted another question in another part of the forum:

http://www.raspberrypi.org/forum/viewto ... 49#p516049
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