Dear Doungjai,
thank you for report of SL50E SN#01011211-11.14.
As I noted your measurements are totally okay and the power-supply seems to be not defective.
During the simmer-mode (CWS) you should measure approx. 90VDC on lamp-connectors, on SL20 approx. 70VDC.
If you switch of the laser-controller (LS1A) is an voltage of 740VDC – 800VDC (if power-supply is okay).
Can you measure this voltages, the trouble must be cause on another part like flash-lamp, ignition-coil…
In your attached vdo file I cannot recognize any problems. The laser-ready LED is lightning green and system is okay.
Kindly let me know if you already changed the power-supply with on power-supply from your stock or an power-supply we had already send to you.