display not powering up

[yoc1983]

I soldered anything as said. plugged the display connectors. burn the firmware. now I am plugging the pico USB to a power source. the pico LED is blinking but the screen is not powering up please any suggestion how to troubleshoot..

[yoc1983]

ok i think i found the source for this it seems the 40 pin connector JLCPCB soldered is wrong looks like they soldered a bottom contact and it needs to be a top contact

[zapta]

I am glad that you identify the problem.

IIRC when connected to a computer, the pico acts as a serial device and prints some information. You can try running an terminal program on your computer and see if it's live and performing measurements.

Also, if you want to test the display before you actually change the connectors, you can try using an adapter like the one below with a PFC cable that fix the top/bottom connectivity.

https://www.aliexpress.com/item/2251832590540738.html

On Sun, Jul 3, 2022 at 2:07 AM yoc1983 @.***> wrote:

ok i think i found the source for this it seems the 40 pin connector JLCPCB soldered is wrong looks like they soldered a bottom contact and it needs to be a top contact

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[yoc1983]

thanks I'm pretty sure it's the connector see in photo the connector they put against what's show on the product page https://drive.google.com/file/d/1bavQEIo6xxDr8_xo8EGmzUrYf8P3HNyD/view?usp=sharing also see in picture adapter from link is the same as what they put so it might be also bottom contact. and i hooked it to a terminal.. please see picture.. seems legit? https://drive.google.com/file/d/1LTrXf8-GXnUezjHyy1qDBUo8GET5GGag/view?usp=sharing

[zapta]

It's difficult to see in the picture if your connector is top or bottom contact. The ones I have on my analyzer, as assembled by JLCPCB, are top contacts. The JLCPCB part number in the BOM and the one I got is C11097 whose page is here https://jlcpcb.com/parts/componentSearch?isSearch=true&searchTxt=C11097 and it's datasheet indicates it's a top contact [image: image.png]

As for your terminal output, it looks good, mentioning steps count and such, so it seems to be live.

On Sun, Jul 3, 2022 at 9:37 AM yoc1983 @.***> wrote:

thanks I'm pretty sure it's the connector see in photo the connector they put against what's show on the product page

https://drive.google.com/file/d/1bavQEIo6xxDr8_xo8EGmzUrYf8P3HNyD/view?usp=sharing http://url also see in picture adapter from link is the same as what they put so it might be also bottom contact. and i hooked it to a terminal.. please see picture.. seems legit?

https://drive.google.com/file/d/1LTrXf8-GXnUezjHyy1qDBUo8GET5GGag/view?usp=sharing http://url

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[yoc1983]

if you see in top the black plastic piece then it's bottom contact this piece push down to make better contact and hold the FPC/FFC

your BOM is perfectly good. I just received feedback from JLCPCB and they admit they made mistake.

anyway I tried to remove the connector from other boards .. this thing is so delicate I decided to go with your idea of using an adapter.. already ordered thank you again man.. for making this project and for support :) 🥇 👍

[yoc1983]

@zapta so as suggested i connected with the PCB that arrived from aliexpress see here: https://drive.google.com/file/d/1A5Pc9cYIGwl52zetmW0Yf0FD_EXcDvRH/view?usp=sharing now the screen shows half white and help weird stuff, see here: https://drive.google.com/file/d/1bptpH4T1mVB36qYaB8jWqCJk5nCJy8TP/view?usp=sharing any suggestion how to progress from here?

[legend069]

@zapta so as suggested i connected with the PCB that arrived from aliexpress see here: https://drive.google.com/file/d/1A5Pc9cYIGwl52zetmW0Yf0FD_EXcDvRH/view?usp=sharing now the screen shows half white and help weird stuff, see here: https://drive.google.com/file/d/1bptpH4T1mVB36qYaB8jWqCJk5nCJy8TP/view?usp=sharing any suggestion how to progress from here?

i'm gonna guess the screen died from when it was plugged in backwards. it's that or the cable/pcb died.

[zapta]

It's hard to tell what the problem is but I would check the large display connector. Make sure the cable is inserted correctly and that there are no visible shorts between the connector pins (some pins are supposed tobe shorted by PCB traces per the schematic).

Also, can you post here a link to the TFT that you ordered? I want to see if it's the right kind.

BTW, I am finalizing a design that will eliminate the complexities around the display. It iss a version that transmits the data in real time via Bluetooth to a python app that displays it on a computer screen. Parts were selected such that JLCPCB can also assemble all the components ($100 for 5 units, $350 for 30 units). I hope to release it in a few weeks.

https://imgur.com/a/fBPWIQX

On Sat, Feb 4, 2023 at 9:10 PM legend069 @.***> wrote:

[image: image] https://user-images.githubusercontent.com/40685552/216802852-b6079901-3763-4808-bbc8-e5c2c9a44619.png

@zapta https://github.com/zapta so as suggested i connected with the PCB that arrived from aliexpress see here: https://drive.google.com/file/d/1A5Pc9cYIGwl52zetmW0Yf0FD_EXcDvRH/view?usp=sharing http://url now the screen shows half white and help weird stuff, see here: https://drive.google.com/file/d/1bptpH4T1mVB36qYaB8jWqCJk5nCJy8TP/view?usp=sharing http://url any suggestion how to progress from here?

i'm gonna guess the screen died from when it was plugged in backwards. it's that or the cable/pcb died.

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[zapta]

... the Bluetooth version can also be left within the printer and you can connect to it from a computer any time you want.

On Wed, Feb 15, 2023 at 6:37 PM Tal Dayan @.***> wrote:

It's hard to tell what the problem is but I would check the large display connector. Make sure the cable is inserted correctly and that there are no visible shorts between the connector pins (some pins are supposed tobe shorted by PCB traces per the schematic).

Also, can you post here a link to the TFT that you ordered? I want to see if it's the right kind.

BTW, I am finalizing a design that will eliminate the complexities around the display. It iss a version that transmits the data in real time via Bluetooth to a python app that displays it on a computer screen. Parts were selected such that JLCPCB can also assemble all the components ($100 for 5 units, $350 for 30 units). I hope to release it in a few weeks.

https://imgur.com/a/fBPWIQX

On Sat, Feb 4, 2023 at 9:10 PM legend069 @.***> wrote:

[image: image] https://user-images.githubusercontent.com/40685552/216802852-b6079901-3763-4808-bbc8-e5c2c9a44619.png

@zapta https://github.com/zapta so as suggested i connected with the PCB that arrived from aliexpress see here: https://drive.google.com/file/d/1A5Pc9cYIGwl52zetmW0Yf0FD_EXcDvRH/view?usp=sharing http://url now the screen shows half white and help weird stuff, see here: https://drive.google.com/file/d/1bptpH4T1mVB36qYaB8jWqCJk5nCJy8TP/view?usp=sharing http://url any suggestion how to progress from here?

i'm gonna guess the screen died from when it was plugged in backwards. it's that or the cable/pcb died.

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