Need Some Help with a screen

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Abunchahicks
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Re: Need Some Help with a screen

Post by Abunchahicks » Wed Aug 23, 2017 8:14 pm

It's going to be hard to center on the pins because of how much you cut from the sides. That may be your main problem.

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144TECH
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Re: Need Some Help with a screen

Post by 144TECH » Wed Aug 23, 2017 8:19 pm

no it won't be hard, just gotta cut straight with a sciccor and it will work, like right now 2 pins are missing a fingertip and they dont come in far enough, by cutting it straight in line, all contacts come to the end of the connector and make contact again. and as far i can see he has enough copper line left to do it, but there's no reason to cut off too much just the same length as the 2 damaged ones should be fine.
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Re: Need Some Help with a screen

Post by giantflyingbirds » Wed Aug 23, 2017 8:27 pm

Ok. Really don't want to further screw this up. To clarify, should I preserve the length of the shorter pins, or trim them down a tad as well?

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Re: Need Some Help with a screen

Post by 144TECH » Wed Aug 23, 2017 8:34 pm

you can use the two damaged pins as reference to cut the rest, as i have seen theres copper enough left, really be sure you cut straight line, in my eyes there's no further screwing up, because you can't solder or fix these 2 shorter ones, so it's better to get them aligned again, it will work trust me just take your time and cut straight. and after that you clip it back in and post a image of your working screen , good luck

P.s no don't trim down further just make them all even
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Re: Need Some Help with a screen

Post by Lphillimore » Wed Aug 23, 2017 8:45 pm

Yeah that's pin 1 you've damaged. A GND pin. If you're careful, doing what 144TECH says should work fine.

That said, have you carefully move the ribbon and retested a few times incase it's still long enough and requires no trimming?

When I first align my screens if it's black for instance i will note its position in the clip, unclip and move up and down to see how much play there is each side. Ill then move more to left for example, lock in and retest, repeating each time until I get the screen to come on.

Most times it works first time however 👍🏼

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Re: Need Some Help with a screen

Post by giantflyingbirds » Wed Aug 23, 2017 9:07 pm

Made a nice straight cut. I'm in the testing process now but it doesn't seem to be working. The screen is completely black. A pic of the full setup complete with a ground wire per Helder's advice is attached.
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Re: Need Some Help with a screen

Post by dryja123 » Wed Aug 23, 2017 9:35 pm

What a your voltage reading from the VCC pad on the screen backboard while the unit is powered on?

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Re: Need Some Help with a screen

Post by Lphillimore » Wed Aug 23, 2017 10:23 pm

I'm assuming you can't get continuity on your Pi GND pin hence the wire. Run that wire to the main GND input to right of board instead.

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Re: Need Some Help with a screen

Post by Helder » Wed Aug 23, 2017 11:34 pm

That isn't even a GND pin on the Pi that is one of the i2c pins.

Did you see if there is voltage on the VCC and GND pads?
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Re: Need Some Help with a screen

Post by Lphillimore » Thu Aug 24, 2017 12:34 am

Good spot, if your soldering has no continuity to GND or 5V that screen aint coming on!

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