LCD 16*2 screen turn off Raspberry Pi

[Neercs]

I am trying to add a 16*2 LCD Screen to an electronic boxe I am currently building, but when I connect the 5 V power supply to the screen my raspberry pi start to blink green and then turn off...

I tried the screen independtly of the boxe in the past it worked...

My raspberry Pi supply a ULN28001a for 4 relays, a voltage regulator for ten 2.6V indicators and the Screen nothing else... I Everything works except when I plug the Screen... Do you have any idea why ?

[FTrevorGowen]

I am trying to add a 16*2 LCD Screen to an electronic boxe I am currently building, but when I connect the 5 V power supply to the screen my raspberry pi start to blink green and then turn off...
I tried the screen independtly of the boxe in the past it worked...
My raspberry Pi supply a ULN28001a for 4 relays, a voltage regulator for ten 2.6V indicators and the Screen nothing else... I Everything works except when I plug the Screen... Do you have any idea why ?

What model of Pi? What type of "16*2 LCD Screen" and connection method (eg. I2C or 4-bit/8-bit parallel interface)?**
Trev.
** I've used quite a few variants:
http://www.cpmspectrepi.webspace.virgin ... plays.html

[Neercs]

Hi and thanks for your answer.

Raspberry Pi 2 B
This LCD screen : http://www.distrelec.ch/en/dot-matrix-o ... simi=99.77
4 bits parallel : http://www.raspberrypi-spy.co.uk/2012/0 ... ng-python/ I followed this. But the connections of the pins and power supply are not the same than in the link...

[Neercs]

My screen shut down my Raspi when I plug the 5 V power on the pin number 2 refering to the datasheet, all the other pins of the screen can be plug without turning off the Raspi...

[drgeoff]

But the connections of the pins and power supply are not the same than in the link...

Big clue there!

That module is claimed to be compatible with the 44780 so why do you say connections are not the same as in the link?

[Neercs]

No sorry the pins are the same on the screen than the one of the link but the GPIOs I chose on the Raspberry Pi are not the same than what it is specified...
I think I try to take too much power from the 5V pins supply (but I am a bit surprised) I will try to redirect few indicators to the 3.3V...

[rpdom]

Perhaps if you say how you did connect it?

Any HD44780 screen shouldn't take any significant amount of current, that's one of the great things about them. If yours does take enough to affect the Pi then it is wired incorrectly or faulty.