Issue with KC868-AIO-EXTAO--V1.2

[mahafree]

Hello,
Since a few days I have been having problems with the analog outputs on my KC868-AIO. (KC868-AIO-EXTAO--V1.2)
channels 1 to 6 work normally
Channels 7 and 8 are off and no longer respond to anything. (the LEDs on the PCB are also off. With a voltmeter I measure 0V on the output)
channel 9 works normally.
Channels 10 and 11 are off and no longer respond to anything. (the LEDs on the PCB burn at 100%. With a voltmeter I measure 11.72V on the output)
When other channels are at 100% I measure 10.2V on the output.
channels 12 to 16 work normally.
When I disconnect all outputs, the above remains the same.
All other inputs and outputs work normally.

I have no idea what happened.
My configuration has not changed.
All outputs are connected to the exact same type of dimmers.

What else can I test?
Is there something wrong with the "KC868-AIO-EXTAO--V1.2" board?

Thank you in advance!
   
   

[admin]

you can test with KCS firmware, check these DAC ports whether work well.

[mahafree]

I installed the KCS software today to test with.
The exact same problems.
Channels 7 and 8 are "on" in the KCS software but the output stays low.
Channels 10 and 11 are "off" in the KCS software but the output is 11.72V.

   

[mahafree]

What are the next steps i need to take?

[admin]

the AIO before is work well, no problem. after used some time, then begin this issue.
or the first time use AIO, already have this issue?

[mahafree]

It's my first time using these channels.
At first I only used the first 8 channels because I only had 8 dimmers.
Channel 7 and 8 worked before.

[admin]

This is strange, if you use ESPHome and KCS firmware all have same problem. maybe the GREEN pcb have some problem.
add whatsapp number: +86-15381188302 tell us your order number before, we re send you a new KC868-AIO board.

[mahafree]

Thank you very much!
If you want, I can send the defective board to you for further investigation.

[admin]

the shipment fee will high, you don't need send back.

[admin]

today will re send you a new KC868-AIO controller.