Amek Angela - LED meters Problem

[smilan]

Hi,
As you can see in this short video I have  too long decay time on my Amek Angela LED meters.
https://youtu.be/IlTcnGAIRpg

This problem occurs either when I'm sending the signal to a single meter or when the signal is being send to more than one meter.
All the meters are divided into three groups coming from the meters power distribution board.
I've tried to run each of those groups separately while the other two group has been disconnected and it acts the same way.
I've also  pulled all the channels from the console in groups of four until I've left with only one channel and still no change.
So it seems like it's not a problem in a single channel...
I've also tested the meters with two more PSUs, one from an Allen & Heath console (+17V / -17V at 6.5A) and a much smaller PSU from a small 8 channels mixer (+15V / -15V at 1.5A that couls only handle one group of meters) and it acts the same way with all 3 PSUs.
What else can I check?

At this link you'll find the schematic for the meters cards:
https://i.ibb.co/jgD34qy/angela-meter-schematic.jpg
Here you'll find the actual voltage I've measured on the 'Power Distribution Board:
https://i.ibb.co/j8119fD/power-distribution-board-voltage.jpg
And this is the schematic of the meters PSU
https://i.ibb.co/YPXcZML/meters-psu.jpg
*It's the same design but without the +48V section.

 

[JohnRoberts]

I haven't dug into the schematics, but that symptom looks like a ground issue between the meter power supply, and console signal ground. The meters are getting a systemic input DC that slowly discharges.

Check ground integrity between meter PS and console PS. Could be one bad solder connection or wire.

JR

 

[smilan]

that symptom looks like a ground issue between the meter power supply, and console signal ground. The meters are getting a systemic input DC that slowly discharges.

Check ground integrity between meter PS and console PS. Could be one bad solder connection or wire.

JR

Thanks you very much JR!
The problem was that *ALL* the 4 pin molex connectors that feeding the signal to the meter card was plugged in a wrong  way with pin 1 connected to pin 4, pin 2 connected to pin 3, pin 3 connected to pin 2 and pin 14 connected to pin 1.
According to the bands of the weirs it seems like it was connected this way for very long time...
As you can see here, now all meters working well!
https://youtu.be/9Jb7vZbfnoo

 

[gar381]

Be shure to check the Diodes on the little distro PCB.  If they go bad
it can cause lots of Meter abnormalities.

Best

GARY

 

[smilan]

Be shure to check the Diodes on the little distro PCB.  If they go bad
it can cause lots of Meter abnormalities.

Best

GARY

Thanks Gary
I've checked  both  diodes and both works well.