Chigo CS-25V1A-H1; CS-35V1A-E2; CS-50V9A-S; CS-70V9A-T - Page 47

Red wire is
P
Blue wire is
N
Fig 1 check the voltage between the point
of P and N whether is about 300V（P is
anode， N is cathode）， If the voltage
between P and N is 0 V，means that PFC
is damaged，please change PFC.
This board is
PFC board.