Incorrect voltage on TP (1->4)

[yaelblazeParticipant]

I have the board NCS314 v2.2.

After finished the assembly of the componentes, except the tubes, I uploaded the arduino code to the mega 2650 board.

I connected it to the shield and gave power. I didn’t get what is expected.

More info: when I soldered the U4 ( ULN2003D ) I didn’t trust the marks to put in the right position so perhaps I did it wrong.
I watched the assembly video https://www.youtube.com/watch?v=2Q5UOZq3XJQ&t=80s and swapped its position.

Now I can see:
+ 8 volts on TP1, TP2 and TP4.
+ 0,5 volts on TP3.

What part could it be ?

[Gra AfchKeymaster]

1. Remove U4 and try to power on the board again.
2. If this does not not help compare your board with this: https://photos.app.goo.gl/mZEVxUJ5zWN7Thk17
3. Please send us some photos of your board in the highest possible resolution, made in good lighting. We will try to identify the problem from the photos.
To transfer photos without loss of quality, you can use the service https://photos.google.com/
(or any other convenient for you)

[yaelblazeParticipant]

Hello again, apprently my power source was not that good. I changed it for a larger one that can push 1,5 amps and 12 volts.

No I can see the initialization LEDs and hear the pink panther song.

And this is what I have

Tp1 12,2
Tp2 12 v
Tp3 4,7v
Tp4 30v (no matter how much I move the variable resistor )

Plus the temperature sensor in TEM1-1 was almost melting. I removed it but no change.

I will check the U1 and U2 regarding the dot, I used the smashed corner as reference.
I wil send the pictures also.

Thanks!

[yaelblazeParticipant]

Ok, I have checked U1 and U2 regarding the dot reference and they are installed correctly.

I have some photos reference. Google Link Photos

[yaelblazeParticipant]

.

• This reply was modified 5 years, 2 months ago by  yaelblaze.

[yaelblazeParticipant]

Today I realized the ground on the other side of the board was other pin, It means that I have tested TP1 wrong 🙁 So it was fine all the time

– I also checked continuity in all pins of U2 and U1 without resistors to NX mounts.
– I also checked the rest of U2 and U1 pins and they are well soldered.

But still I am having 11,5v in TP4

Tp1 12
Tp2 12 v
Tp3 4,7v
Tp4 11,5v

• This reply was modified 5 years, 2 months ago by  yaelblaze.
• This reply was modified 5 years, 2 months ago by  yaelblaze.
• This reply was modified 5 years, 2 months ago by  yaelblaze.

[yaelblazeParticipant]

Finally I have got the 150 volts on TP 4 with the tubes soldered

However the tin on Q1 started melting!

I cannot increase the voltage, what could it be?

• This reply was modified 5 years, 2 months ago by  yaelblaze.

[yaelblazeParticipant]

.

• This reply was modified 5 years, 2 months ago by  yaelblaze.

[Matthew CrouthamelParticipant]

Wonder if you ever got this fixed.
There is no TP1 on the 2.2 board that i can see.

[Author]

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