DA-2000 NUMITRON tubes not driven

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1 month 5 days ago - 1 month 5 days ago #12323 by Ya
Hello


On the Numitron kit, the tubes are not driven.
The test procedure only flashes the LEDs.
The wemos responds well, and I have access to the clock configuration.
The TLC5916s do receive their 5V.
Ps: When I tested the card without the tubes, nothing worked:
the card was shorted. It came from the usb socket that I unsoldered.
Last edit: 1 month 5 days ago by Ya. Reason: Need help to build kit

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1 month 5 days ago #12325 by Ya
Regarding the condenstaeurs, it is written that I do not need C15, C13, C3, C2, C1, C6, C5, CA.

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1 month 5 days ago #12327 by Ian
Oh, I am sorry about the USB connector not working. I fit it because it is tricky to solder and I am usually quite good at it. This time apparently not. I test each one, first with a continuity test and then to check that 5V arrives at the test points. I do not know what went wrong.

The little capacitors next to the LEDs are indeed not needed. The WS2812B already has them.

I send you the schematic. My first question would be, are the resistors R1-R6 installed? These set the current limit to the tube filaments.

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1 month 5 days ago #12330 by Ian
Please also check that the voltage at the 3V8 test point shows between 3.8V and 4.2V. This supplies the TLC5916 chips.

I would also check the signal to the input of the TLC chain.

I notice that this runs close to the USB connector. Perhaps there is a short there, we have been having trouble with this area...
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1 month 5 days ago #12332 by Ya
Bonjour Ian
first of all thank you for your attention.
I have 3.8V at the test point, I also have 3.8V on the TLC5916s.
On the other hand I have no voltage between D6 and the TLC5916.
At the risk of repeating myself, I would like confirmation that I do not need C1 C2 ... C6. It's a bit confusing for me looking at your schema and the part list.

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1 month 5 days ago #12333 by Ian
Oh, I see in the manual that the board drawing does not have the part numbers on it. It only shows the top of the board, where there is nearly no silk screen. Let me correct that. Just a moment...

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