Hi guys,
Just joined in today.
I have a 300w ATX psu and having problem with it.It is operating but the regulation is poor .The voltage output from the +12 volt terminal is 11.2 at open and drops to 10.45 on a load which draws 1A.Similarly the +5volt and the +3.3 volt pins are a not stable too.
I have googled for repairing it.They said that their might be problem with TL431 chip but in my PSU this chip is not connected the regulation part.The pwm ic in it is ka7500.Downloaded Its datasheet but could not understand its totally.
I want to build a three-stage charger from it by modifying it .
Guys, please help me !! Having a lot of trouble here.
Just joined in today.
I have a 300w ATX psu and having problem with it.It is operating but the regulation is poor .The voltage output from the +12 volt terminal is 11.2 at open and drops to 10.45 on a load which draws 1A.Similarly the +5volt and the +3.3 volt pins are a not stable too.
I have googled for repairing it.They said that their might be problem with TL431 chip but in my PSU this chip is not connected the regulation part.The pwm ic in it is ka7500.Downloaded Its datasheet but could not understand its totally.
I want to build a three-stage charger from it by modifying it .
Guys, please help me !! Having a lot of trouble here.
Last edited: