7 inch touchscreen display is completely dark wont turn on

i had to reinstall after it crashed trying to do apt-get upgrade and after that i put sd card in power on and nothing happens red light stays on with a blinking green light as well any assistance with figuring out why the touchscreen wont turn on plus fixing the apt upgrade issue, im aware i have to install the complete version before initiating the upgrade command but when i run that command it says theres no version in the repository... ?

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0 colporteur over 5 years ago

try sudo apt-get update after after complete sudo apt-get upgrade
or
sudo apt update after after complete sudo apt upgrade

I have noticed if you don't do an update before an upgrade you experience the error you are seeing. I gave you both version because the trend is to use just apt and move away from apt-get.
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0 chriscart over 5 years ago in reply to colporteur

i do update before the upgrade the update works fine then when i attempt upgrade part of the way through screen goes black with white blinking line in top left corner i ti try to run apt get kali complete but i get the error that there is no such file in repository. my main issue as of now is my touchscreen wont even turn on shows no sign of power as depicted in the photos
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0 onegoodeye over 5 years ago

There's a few things wrong with the wiring. You followed the wiring for a PI2 not a Pi4. You likely pick it up off the element14 product page. Shame on element14 for letting 5 year outdated information on their site.

I've attached a pic from my broken iphone of the wiring
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0 chriscart over 5 years ago in reply to onegoodeye

in that image are you trying to show the correct way to wire the raspberry pi 4b to the 7 inch touch screen and you were correct on assuming that i got the wiring diagram from element 14 but its extremely hard to see the setup in the picture you sent me if you can elaborate more?
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0 hugohu over 5 years ago

You... don't need the jumper wires.... except for the red and black ones...

I mean technically you could just use the red one and not even use the black one.

Unplug the green and yellow ones from the board. It may be because the FAN SHIM is using those pins.

Also hold your DSI cable to the light to see if there are any cracks in the line. If so it's probably broken and you'll need to replace/
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0 hugohu over 5 years ago in reply to onegoodeye

The pinout on all raspberry Pi's are the same.

26 pin headers are the same just with 14 additional pins on the standard 40pin GPIO.
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0 hugohu over 5 years ago in reply to hugohu

It probably isn't an issue with the DSI since it looks good but maybe your SD card needs to be re-formatted and re-flashed since it crashed.
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0 onegoodeye over 5 years ago in reply to hugohu

then the wiring on their site is incorrect
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0 onegoodeye over 5 years ago in reply to hugohu

"I mean technically you could just use the red one and not even use the black one."

Are you saying the power return voltage should find it's own way back ? maybe through screws and signal ground which a both inappropriate for power.
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0 onegoodeye over 5 years ago in reply to chriscart

Sure
Color         Function           RPI PIN
--------------------------------------------------------
RED:          +5v                    2, 4
BLACK:     GROUND           6, 9, 14, 20, 25, 34, 39
YELLOW: CLOCK               5
GREEN:    DATA                 3
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