Hi, can anyone tell me what may cause the base-collector voltage to be
over 1000V?
If the HOT is connected B-C voltage is over 1000V and voltage at base
is less than 1 volt, if i remove the HOT, B-C voltage drops to 112V and
Base still is less than 1V.

Voltage at chopper transistor´s collector (low voltage power supply)is
also over 1000V...
Can anyone tell me what is going on?
What can cause these very high voltages?

Thanks.