[SOLVED] BW screen variant 9 no display

Raspberry Pi hardware discussion (including peripherals)
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farki22
Posts: 2
Joined: Sun Feb 19, 2017 12:15 pm

[SOLVED] BW screen variant 9 no display

Post by farki22 » Wed Feb 22, 2017 3:04 am

Hi,

I bought a screen on ebay and I try to connect it to the rapsberry pi 3 in rca.
The pcb card of the screen is the variant 9 and I modified so that it works in 5 volts.
I connected the wires but I have no display.

I modified the config.txt and tested raspbian and recalbox but I still have no display on the screen
the video output works on a tv with a composite input with the modified config.txt. (I soldered a composite connection to the pi 3 for testing)

Here are some pictures of the connections. I tried to solder the ground on the power supply or next to the video output: nothing
I connected the 2 ground (video and power): nothing

I think the screen is dead but I do not know what to test to be sure.
I took info with the multimeter:

On the raspberry:
- The red and black wires of the power supply are at 5.19 v
- the yellow and black wires of the video output are at 0.88 v

on the screen pcb :
- the red and black wires are at 5.19v (same thing on the red wire of the modification)
- the yellow and black wires are at 0.86 v

Any help would be appreciable
Thank you for taking the time to read
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Last edited by farki22 on Fri Feb 24, 2017 1:13 am, edited 1 time in total.

farki22
Posts: 2
Joined: Sun Feb 19, 2017 12:15 pm

Re: BW screen variant 9 no display

Post by farki22 » Fri Feb 24, 2017 1:13 am

Hi,

The screen now works. Indeed , the problem was on the red link wire. It touched a bit the printed circuit so I soldered correctly this and it works.
IMG_20170224_090253.jpg
IMG_20170224_090253.jpg (57.83 KiB) Viewed 2493 times

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