Bad screen / ribbon cable

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TechIsAmazing
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Re: Bad screen / ribbon cable

Post by TechIsAmazing » Mon Aug 20, 2018 8:43 pm

I apologize in advance, but I am confused on how to progress on building my Minty Pi. This is my first-time building something like this. I GREATLY appreciate the help! :)

1. The Screen still does not work, it creates lines when booted
a. I checked the continuity of the ribbon cable on both ends, including bending the cable – Tested fine
b. I checked the continuity of the “test pads” on the screen, and their corresponding test pads on the button PCB – Tested fine
i. However, it appears the “SCK” test pad on the button PCB corresponds to the “SCL” test pad on the screen. Is that correct?
c. I tested the continuity of “Raspberry Pi” solder points to the corresponding test pads on the button PCB – Tested Fine
d. I connected Raspberry Pi with and HDMI connection to a TV Monitor – Everything worked fine

2. As Helder suggested above that the ribbon connector pins may have a weak point, and suggested extra solder on the ribbon connector pins. I’m not sure where to solder, I have attached two (https://imgur.com/a/sw2Fltn, https://imgur.com/a/KRH13vj) pictures of where I think he means. Is this the correct location?
a. How can you solder without touching the other pins, since it is so close? (I am worried about taking a chance and ruining the circuit boards / screen)

Thank you once again for the help!

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Helder
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Re: Bad screen / ribbon cable

Post by Helder » Tue Aug 21, 2018 1:12 am

The SCL and SCK are a typo and are the same. The connector you showed in the links are the ones I'm referring to.
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Re: Bad screen / ribbon cable

Post by TechIsAmazing » Wed Aug 22, 2018 7:16 pm

I just tried to solder the ribbon connector pins, and it still is not functioning properly. I keep getting either a white screen or those lines (as I showed in pictures above). :(

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Helder
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Re: Bad screen / ribbon cable

Post by Helder » Thu Aug 23, 2018 6:05 am

Show me a video of you touching the ribbon or whatever it is you touch to get the screen to give out.
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Re: Bad screen / ribbon cable

Post by TechIsAmazing » Thu Aug 23, 2018 10:53 am


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Re: Bad screen / ribbon cable

Post by dryja123 » Thu Aug 23, 2018 2:08 pm

Does anything make contact with the exposed ribbon on the back? If so, you could be shorting the screen which would cause that issue.

Read more about it here: https://sudomod.com/forum/viewtopic.php?f=34&t=4425

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Re: Bad screen / ribbon cable

Post by TechIsAmazing » Thu Aug 23, 2018 2:20 pm

No, nothing is touching the ribbon connector...

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Re: Bad screen / ribbon cable

Post by TechIsAmazing » Fri Aug 24, 2018 12:16 pm

Helder, did the videos come over okay?

Thanks again for all of your help! :)

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Re: Bad screen / ribbon cable

Post by Helder » Fri Aug 24, 2018 1:07 pm

TechIsAmazing wrote:
Fri Aug 24, 2018 12:16 pm
Helder, did the videos come over okay?

Thanks again for all of your help! :)
Ok it looks like it's the back of the LCD board that we need to inspect, get a few good pictures of that so I can see.
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Don't contact me about obtaining my board files (as you will not get them). If my Boards or PCB Kits are sold out, they will be restocked as soon as I can get them and there is demand for them. You can join the mailing list on my Website to be notified when they are available.


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Re: Bad screen / ribbon cable

Post by TechIsAmazing » Fri Aug 24, 2018 2:24 pm

Here are some pictures!
https://imgur.com/a/HLMZAUh - Front
https://imgur.com/a/qBGtMrw - Back

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