No video- BW screen variant 9

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tlxxxsracer
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No video- BW screen variant 9

Post by tlxxxsracer » Thu Jul 13, 2017 5:43 pm

Im switching screens from gearbest to BW variant 9. Now I have no video. Was following the wiring guide which used GB screen in the example
Wasn't sure if I attach both white or yellow to the video pin on the pi.

Here's my wiring
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dryja123
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Re: No video- BW screen variant 9

Post by dryja123 » Thu Jul 13, 2017 6:00 pm

Power strip, picture 2 lower right corner, it looks like your ground and 5v are on the same circuit. Also, shorten up the copper on the ok we pads on the Pi. They're too long and if they touch you will short your board.

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Re: No video- BW screen variant 9

Post by tlxxxsracer » Thu Jul 13, 2017 6:18 pm

That wiring hasn't changed with my other screen, hadn't had an issue with those

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Re: No video- BW screen variant 9

Post by dryja123 » Thu Jul 13, 2017 6:29 pm

Have you tested the voltage on the screen driver board?

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Re: No video- BW screen variant 9

Post by tinkerBOY » Fri Jul 14, 2017 6:23 am

Video
- you just need to connect one video wire to the tv pin on the pi. Disconnect the white.

Power
- looks like your screen is being powered by the 3.3v on the pi but you connected it to the 5v pin on the screen chip.
- Try to connect a 5v power supply to it instead.
- desolder the red wire on the lcd board and just directly solder it where you soldered the purple wire.

Before you do that send a picture of the chip where you soldered the purple so we can check if it's a 5v regulator.

There's probably a 3.3v regulator there too.
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Re: No video- BW screen variant 9

Post by dryja123 » Fri Jul 14, 2017 6:28 am

I didn't catch that both the white and yellow are soldered together on the same hole. That would definitely do it as well.

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Re: No video- BW screen variant 9

Post by tlxxxsracer » Fri Jul 14, 2017 12:03 pm

I was gauging my wiring off this
http://i.imgur.com/jJddqdg.jpg
So basically just run the 5v wire on the screen to my power strip instead of the pi?

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Re: No video- BW screen variant 9

Post by tinkerBOY » Fri Jul 14, 2017 5:46 pm

tlxxxsracer wrote:
Fri Jul 14, 2017 12:03 pm
I was gauging my wiring off this
http://i.imgur.com/jJddqdg.jpg
So basically just run the 5v wire on the screen to my power strip instead of the pi?
It doesn't really matter where you connect the 5v power whether from the pi or directly from the power supply/strip. I just prefer to connect directly to the power supply.
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Re: No video- BW screen variant 9

Post by tlxxxsracer » Fri Jul 21, 2017 5:58 am

Resolved. Wired power directly to the power strip, unsoldered the white wire and also took off the purple wire to the chip on the screen board and it came up just fine. Interesting

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Re: No video- BW screen variant 9

Post by gbzboi » Sun Aug 13, 2017 10:27 pm

I just got the same screen and wired it like this. But nothing. What was your final wiring?
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