NebularPi
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Raspberry Pi not lighting up at all, official 7” touchscreen

Sun Jun 02, 2019 8:11 am

I tried with three different Pis and a working SD card but the LEDs on the Pi didn’t light up at all, not even the PWR. I’m using two of the official Raspberry Pi power supplies and all the cables are in correctly. I tried them all yesterday and they all worked. Now when I try to use them for the touchscreen, they do not light up. The Boot Problems sticky didn’t help at all. On the screen, nothing is happening at all. No flashing lightning symbol, no rainbow cube, nothing. It doesn’t turn on.

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DougieLawson
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Re: Raspberry Pi not lighting up at all, official 7” touchscreen

Sun Jun 02, 2019 8:22 am

If the red LED doesn't come on then your RPi is dead. The usual way to kill them is over voltage on a GPIO or shorting pin#1 (3.3V) to pin#2 (5V).

The repair costs £35.
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aBUGSworstnightmare
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Re: Raspberry Pi not lighting up at all, official 7” touchscreen

Sun Jun 02, 2019 9:01 am

Post pictures how you've connected your 7in screens

NebularPi
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Re: Raspberry Pi not lighting up at all, official 7” touchscreen

Sun Jun 02, 2019 2:44 pm

https://imgur.com/Xx52sy2 Here is the setup. I didn’t attach it because the file was too large. I also tried with 3 different Raspberry Pi’s, with different power supplies.


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davidcoton
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Re: Raspberry Pi not lighting up at all, official 7” touchscreen

Sun Jun 02, 2019 3:18 pm

The ribbon cable isn't straight in the screen's connector.

Try disconnecting all the wires going to the GPIO, and using separate PSUs for screen and Pi.
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DougieLawson
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Re: Raspberry Pi not lighting up at all, official 7” touchscreen

Sun Jun 02, 2019 4:10 pm

Get rid of the green & yellow wires.
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gkaiseril
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Re: Raspberry Pi not lighting up at all, official 7” touchscreen

Sun Jun 02, 2019 4:29 pm

Make sure that the ribbon connectors are matched to DSI connectors. There were some Pi's that had the plugs soldered in backward. the 7 inch screen only need ground and _5v. There are also USB b micro Y connectors to share power from the power supply to the screen and Pi. Use only 1 power sharing or supply choice.

Official 7" LCD Touch Screen Build Instructions
f u cn rd ths, u cn gt a gd jb n cmptr prgrmmng.

NebularPi
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Re: Raspberry Pi not lighting up at all, official 7” touchscreen

Sun Jun 02, 2019 5:12 pm

I tried with yet another Pi, double checked the cables, took out the green and yellow wires, re-flashed the SD card, and it still doesn’t work.

NebularPi
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Re: Raspberry Pi not lighting up at all, official 7” touchscreen

Sun Jun 02, 2019 5:24 pm

So I took out all of the cables except black and now it lights up (with red PWR symbol, but I know what to do then.) As soon as I put in red, it turns off.

NebularPi
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Re: Raspberry Pi not lighting up at all, official 7” touchscreen

Sun Jun 02, 2019 5:29 pm

https://imgur.com/gallery/H2MAI4x It only works when I plug the black cable in that pin.

aBUGSworstnightmare
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Re: Raspberry Pi not lighting up at all, official 7” touchscreen

Sun Jun 02, 2019 6:38 pm

Your GND goes to GPIO4🤔

Refer to https://www.raspberrypi.org/documentati ... /README.md for GPIO usage. Make sure to connect GND only (!) to s GND pin.

Also note this wire is not needed as GND is available from the DSI connector.

Can' see FFC orientation from that pictures. Be sure to test with another FFC; your's has some serious bends (looks like 90°); there is the risk that your FFC has micro cracks in some of it's traces.

jamesh
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Re: Raspberry Pi not lighting up at all, official 7” touchscreen

Mon Jun 03, 2019 1:02 pm

gkaiseril wrote:
Sun Jun 02, 2019 4:29 pm
There were some Pi's that had the plugs soldered in backward.
Very few, and years ago, never happened on the Pi3 AFAICR.
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dustydream
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Re: Raspberry Pi not lighting up at all, official 7” touchscreen

Sat Jun 15, 2019 6:55 pm

I'm a total NOOB and currently having issues setting up my touchscreen. I think my issue is the power supply I'm using, anyway...

I could be wrong but it looks like your missing the ribbons connected from the screen, to the board that comes with the screen. I've attached a photo of mine... Now off to hunt for a fix for mine :lol:
Attachments
IMG_0337c.jpg
IMG_0337c.jpg (38.99 KiB) Viewed 206 times

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DougieLawson
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Re: Raspberry Pi not lighting up at all, official 7” touchscreen

Sun Jun 16, 2019 12:34 am

Pull off the green and yellow wires and throw them in your collection of spare dupont wires.
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