how to repair pc smps

[milak raj saini]

in smps transistors MJE13007 faulty. i have replaced the same but after replacement smps gives no stand by voltage. no voltage on green wire.

 

[davoud]

I think you should check these parts :
1- check fuse ptc (if present ) full bridge for rectifying AC input voltage
2- transformer and regulator of standby circuit also it's resonator transistor or ic

 

[milak raj saini]

what is the input & output voltage of standby circuit resonator transistor or ic

 

[davoud]

there are more circuit for wake-up circuit for example please see this site:
http://www.pavouk.org/hw/en_atxps.html

 

[pradeep.g.belchada]

stand by supply voltage in pc atx smps is 12v to tl494 drive & 5v on green wire. check 300vdc on filter cap main

 

[sahu]

how can increase o/p volt (12 volt) till 13.5 volt

 

[pradeep.g.belchada]

by changing the feedback voltage