No Power on Headphone output and major problem with controlboard connection

Hi Guy’s, After some testing I desided to buy the original Zynthian main- and controlboard so I would get a nice working system as designed and make it easy for me. Unfortunately this is not the case.
I have two problems.
1 is that the Head phone output has almost no output (or volume has to be set somehere I can’t find. (Audio levels are on 100)

the second issue is something sever!!
As soon as I connect the flatcable between the Main- and controlboard it burns out !!!
Off course I took it out as fast as I could. (unfortunetly the plastic of the connector is already damaged so I hope I can still use it.
If I only connect the cable in the mainboard there is no problem (so no short on that side)
But as soon as it’s connected to the control board it gets hot.
I looked at the cable, but all the little dends the connector is making were perfectly on the leads and no short can be seen. So I suspect I received a faulty controlboard.

Is there somebody who can help out with this.

Thx

re “second issue”, Is your main to control board ribbon cable type B as described in this post: