solved: much noise, independent of sensitivity

[yoghurt]

Hi. I assembled my DSO138 (13803K). Voltages seem okay for me. Display is also working.
My problem is that I always see a noisy/oscillating signal. Its amplitude doesn't change much when I change the sensitivity.
Touching the red clip makes a difference but the signal is still very noisy. You can see the noise here:https://youtu.be/EA16srJY1WI.
I'm using a 9 V / 2250 mA power supply.

voltages:
AV- -5.03V
AV+ 4.86V
+3.3 3.3V
+5V 4.89V
D2 (upper) 9.01V
V1 0.068V
V2 1.71V

Regards
Eric

[yoghurt]

I found the problem by myself.
C10 and/or C11 were not soldered good enough.