Hallo Saber smiths

i have a problem and need your help, because i cannot find a solution.

it is my first saber. using a PC-L with one accent LED and an indicator LED. 2 Li-ion power cells with 3,7 V and 2600 mAh each are used with protection circuit for 2 cells.
when I pull off the kill plug, the sabe goes in idle mode, indicator LED lights up bright, and the accent LED starts blinking. but when push the AV button of the saber, it doesn't light up. The high Power LED ( green seoul p4 ) stays off.

cannot find any solution for my problem. can someone here help me please? thank ya all.