duall
Posts: 20
Joined: Sun Dec 06, 2015 9:31 pm

Re: Modifying a 3.5" car display for USB power.

Wed Jan 27, 2016 2:45 am

Hello , recently I bought a screen on ebay, 3.5 " . The 've connected to GPIO , without any modification .
It works perfectly , the perfect image .
Gpio seems sufficient to feed
Image
https://www.youtube.com/watch?v=8eNRs2N2r_c

no modification has not been necessary, feeding extracted directly from the 5V connector gpio

klaaas
Posts: 1
Joined: Thu Apr 25, 2013 3:33 pm

Re: Modifying a 3.5" car display for USB power.

Wed Feb 03, 2016 10:11 am

Hello, this is a 5 '' screen ., works without modification .

Image Image

All it needs is 5V

duall
Posts: 20
Joined: Sun Dec 06, 2015 9:31 pm

Re: Modifying a 3.5" car display for USB power.

Wed Feb 03, 2016 2:27 pm

klaaas wrote:Hello, this is a 5 '' screen ., works without modification .

Image Image

All it needs is 5V
Did you also feed the output gpio ?

Shocky
Posts: 1
Joined: Mon Feb 15, 2016 9:07 pm

Re: Modifying a 3.5" car display for USB power.

Mon Feb 15, 2016 9:22 pm

I have a 3.5 tft with the mini board in the attachment it has an AMS117-3.3

Doing some testing and connecting a lead direct from the 3.3 gpio pin1 to the area labeled 3.3 on the image the screen works perfectly fine boots no issues.

Would I be right in thinking I can use this configuration and un solder the 5v and ground and then resolder the ground direct to the ground pin on gpio and the screen would run perfectly fine? Or would I run into any problems?

I'm new to all this so please go easy on me
Attachments
Capture.JPG
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Villemus
Posts: 4
Joined: Fri Feb 12, 2016 4:04 am

Re: Modifying a 3.5" car display for USB power.

Mon Feb 22, 2016 9:01 am

MauroG wrote:
Hendu wrote:MauroG, with that board and the wiring suggested, do you have to remove the chip at all?
You do not have to remove the regulator chip from the board I mentioned if you follow the wiring I suggested.

Actually you don't need to remove any regulator chip from any board if you bypass it (by wiring your +5v to the regulator +5v output). In most cases you can even wire your +5v to the +12v input of the regulator chip, and it will still work (not for all the boards though, for example not with the board I mentioned in the last post). My point is just that the advantage of removing the regulator chips is null, or at least questionable. Just go with the wiring in the pic I posted if you come across that board

Cheers
Hi Mauro, have you tried removing or do you know which capacitors/inducers can be removed to make this a low profile board? I'm trying to put it in a really tight space and power it through my RPI.

duall
Posts: 20
Joined: Sun Dec 06, 2015 9:31 pm

Re: Modifying a 3.5" car display for USB power.

Mon Feb 22, 2016 5:02 pm

coolcrab wrote:My scientist friend helped me :D
Image
Image


I have the same board. currently it works without modification, but I want to make a change like yours , maybe save amps , which voltage are using , you are connected to the condenser , but how you cut pin capacitor to the plate ?

edit:

I measured the consumption of amperes, without any modification , consumption is 200mA , I'll leave unmodified , and seems a good figure
Last edited by duall on Tue Feb 23, 2016 2:19 am, edited 1 time in total.

Hetzel21
Posts: 2
Joined: Mon Feb 22, 2016 10:38 pm

Re: Modifying a 3.5" car display for USB power.

Mon Feb 22, 2016 11:11 pm

Shocky wrote:I have a 3.5 tft with the mini board in the attachment it has an AMS117-3.3

Doing some testing and connecting a lead direct from the 3.3 gpio pin1 to the area labeled 3.3 on the image the screen works perfectly fine boots no issues.

Would I be right in thinking I can use this configuration and un solder the 5v and ground and then resolder the ground direct to the ground pin on gpio and the screen would run perfectly fine? Or would I run into any problems?

I'm new to all this so please go easy on me
Hey Shocky,

I believe I have a board like yours. I would like to know how you got it to work/ converted it to 5v. Try to be easy on me, I am also a noobie. Any feeback is much appreciated!
Attachments
IMG_20160222_180608.jpg
3.5" backup monitor from amazon
IMG_20160222_180608.jpg (56.34 KiB) Viewed 6526 times

liveinabin
Posts: 3
Joined: Sun Mar 04, 2012 10:41 am

Re: Modifying a 3.5" car display for USB power.

Wed Feb 24, 2016 12:41 pm

I have that little blue board with the extra 3.3v point. So, bear with me, I'm just trying to clarify what I need to do.

So that 3.3v point goes to the 3.3v pin on the Raspberry Pi GPO, correct?
What about the 5v? I take it I'm using the USB power cable for that.
No idea about where to join up the ground, I'm assuming I need a ground to the yellow video cable (to go with the composite wire) but don't I also need to ground to the Pi GPO if I'm using the 3.3v pin? Sorry if that's laughable, I don't have much of a grasp of electronics yet.

Hetzel21
Posts: 2
Joined: Mon Feb 22, 2016 10:38 pm

Re: Modifying a 3.5" car display for USB power.

Fri Feb 26, 2016 11:44 am

Hey everyone, I know I already posted the issue but I was hoping you could help modify my board. I have the mini blue board and I am hoping it could be converted to 5v to be used with a raspberry pi for a Gameboy project. I could truly use all the help that I can get. Thank you in advance and have a great day! In addition, I have not been able to find anything about it elsewhere, this is the only useful site.

BMS Doug
Posts: 3824
Joined: Thu Mar 27, 2014 2:42 pm
Location: London, UK

Re: Modifying a 3.5" car display for USB power.

Fri Feb 26, 2016 3:24 pm

Hetzel21 wrote:Hey everyone, I know I already posted the issue but I was hoping you could help modify my board. I have the mini blue board and I am hoping it could be converted to 5v to be used with a raspberry pi for a Gameboy project. I could truly use all the help that I can get. Thank you in advance and have a great day! In addition, I have not been able to find anything about it elsewhere, this is the only useful site.
Try running your board with 5V connected to the 12V input, if you have the board that you described then it should work with no modification required.
Doug.
Building Management Systems Engineer.

ThomPe
Posts: 3
Joined: Mon Feb 29, 2016 10:21 am

Re: Modifying a 3.5" car display for USB power.

Mon Feb 29, 2016 10:57 am

Hi everyone,
I have a display with that board :
ImageImage
I saw that this very board seems really frequent and I saw the wiring MauroG suggests. However I am using a RasPi 2 and its classical composite video input has been replaced by a 3.5mm audio/video jack. I am totally new to that kind of stuff and I don't really know how I could make that display work on my Pi without using a hdmi converter. So, my question may be stupid but is there any way I could make that display work with the 3.5mm jack or the hdmi input of the RasPi ?
Thank you very much :)

BMS Doug
Posts: 3824
Joined: Thu Mar 27, 2014 2:42 pm
Location: London, UK

Re: Modifying a 3.5" car display for USB power.

Tue Mar 01, 2016 11:52 am

get a 4 pole 3.5mm Jack and wire the sleeve to the video and the ring next to the sleeve to ground.
Image
Doug.
Building Management Systems Engineer.

ThomPe
Posts: 3
Joined: Mon Feb 29, 2016 10:21 am

Re: Modifying a 3.5" car display for USB power.

Sat Mar 05, 2016 11:55 am

Hi ! Thank you for your quick answer. I finally adopted another way more efficient for my project. I directly wired the screen to the Raspberry Pi. I used that wiring to make it work with 5V : Image
I used the GPIO ports for the 5V, 3.3V and GND and I wired the composite video output under the RasPi where is originally soldered the jack ouput :
Image
It works perfectly ! :)
Image

liveinabin
Posts: 3
Joined: Sun Mar 04, 2012 10:41 am

Re: Modifying a 3.5" car display for USB power.

Sat Mar 05, 2016 9:59 pm

That's very elegant. I am absolutely doing that!

BMS Doug
Posts: 3824
Joined: Thu Mar 27, 2014 2:42 pm
Location: London, UK

Re: Modifying a 3.5" car display for USB power.

Mon Mar 07, 2016 12:31 pm

You can probably omit the 3v3 connection.

I hope my reply assisted you with determining the correct points to solder to, good luck with your ongoing project.
Doug.
Building Management Systems Engineer.

ThomPe
Posts: 3
Joined: Mon Feb 29, 2016 10:21 am

Re: Modifying a 3.5" car display for USB power.

Mon Mar 07, 2016 4:21 pm

The 3v3 connection is indeed useless. Thank you for your help !

hopeidontbreakit
Posts: 2
Joined: Fri Mar 18, 2016 8:30 pm

Re: Modifying a 3.5" car display for USB power.

Fri Mar 18, 2016 8:40 pm

I bought this display from amazon: http://www.amazon.co.uk/Utility-3-5-inc ... ar+display

I seem to have another (much smaller) different board.

Image

Can I just wire 5v to the AMS1117 output?

Thanks for any help.

BMS Doug
Posts: 3824
Joined: Thu Mar 27, 2014 2:42 pm
Location: London, UK

Re: Modifying a 3.5" car display for USB power.

Fri Mar 18, 2016 11:01 pm

hopeidontbreakit wrote:I bought this display from amazon: http://www.amazon.co.uk/Utility-3-5-inc ... ar+display

I seem to have another (much smaller) different board.

Image

Can I just wire 5v to the AMS1117 output?

Thanks for any help.
Your AMS1117 3.3 seems to be marked 3.3, I expect that means you have a 3V3 output so wiring 5 to the output would damage the board.
Most 3V3 voltage regulators will accept a 5V input, so try running your display with your 5V supply connected to the boards normal voltage input.
Doug.
Building Management Systems Engineer.

Tamasco
Posts: 2
Joined: Mon Nov 30, 2015 7:11 am

Re: Modifying a 3.5" car display for USB power.

Sun Mar 20, 2016 7:07 pm

Hi guys,

I just bought this 3.5'' lcd, and want to convert it to 5v to used it with my Raspberry. Could anyone help me with it? I have been reading the thread, and I´m not sure how to proceed.

Would one of the holes marked be the 5v one? Do I need to remove anything from the PCB?

http://oi68.tinypic.com/x5ee60.jpg
(not able to upload here the pic)

Thanks for all!

Tamasco
Posts: 2
Joined: Mon Nov 30, 2015 7:11 am

Re: Modifying a 3.5" car display for USB power.

Thu Mar 24, 2016 11:27 am

BMS Doug wrote:
hopeidontbreakit wrote:I bought this display from amazon: http://www.amazon.co.uk/Utility-3-5-inc ... ar+display

I seem to have another (much smaller) different board.

Image

Can I just wire 5v to the AMS1117 output?

Thanks for any help.
Your AMS1117 3.3 seems to be marked 3.3, I expect that means you have a 3V3 output so wiring 5 to the output would damage the board.
Most 3V3 voltage regulators will accept a 5V input, so try running your display with your 5V supply connected to the boards normal voltage input.
Hi @BMS Doug , you seem to know how this things work. Could you help me with my doubt above? Thanks a million

duall
Posts: 20
Joined: Sun Dec 06, 2015 9:31 pm

Re: Modifying a 3.5" car display for USB power.

Mon Mar 28, 2016 1:49 pm

Giandroid wrote:Hello all, I have the same exact screen as DarkWolf 896. I got it here:

http://www.amazon.com/3-5-Inch-TFT-Moni ... 0045IIZKU/

I would take a picture of the board, but honestly, his are better. I will include them here. I don't quite know where to begin; I don't know which one is the voltage regulator chip. I also would like this screen to run on 5 volts, as it's for a portable computer.

Thanks!

Image
Image

I'll try , my plate is similar, will connect 5v . the top connectors .
Image

Flash4825
Posts: 1
Joined: Fri Apr 08, 2016 3:50 am

Re: Modifying a 3.5" car display for USB power.

Fri Apr 08, 2016 3:58 am

I have the same board as above. I wanted to know what I need to do in order to have the pi and screen run off a ps vita battery what wires go where and if I need to buy anything else? I would also like to charge the battery but don't know what I need to even get started.. Any help us greatly appreciated.

JaceF8
Posts: 5
Joined: Tue Apr 12, 2016 4:12 am

Re: Modifying a 3.5" car display for USB power.

Tue Apr 12, 2016 4:44 am

Any thoughts on the modification process for this board. I haven't seen one like this anywhere on the site. I dont know which chip to remove. Two look very similiar.

https://www.dropbox.com/sh/atpwqc2fkt45 ... isFua?dl=0

optimmo
Posts: 3
Joined: Sun Apr 17, 2016 4:59 pm

Re: Modifying a 3.5" car display for USB power.

Thu Apr 21, 2016 11:09 pm

I have the same board as @JaceF8 I think...
http://imgur.com/qIAbOhT
I put one wire in GPIO pin #2 5V and pin #6 ground and it fired right up.
You'll see in my image there are only 3 pins, I unsoldered them and soldered on some jumpers and I removed AV2 (white wire).

JaceF8
Posts: 5
Joined: Tue Apr 12, 2016 4:12 am

Re: Modifying a 3.5" car display for USB power.

Thu Apr 21, 2016 11:40 pm

Otimmo... your saying you connected your screen to the 5v GPIO pin and it powered up without modifYing the board first?

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