metalb00b00
Well-known member
- Joined
- Jul 8, 2012
- Messages
- 294
For the past few days I've been trying to fix this dead triple output switching power supply adapter (PSU25A-14E)
After I opened the case, I saw six bulging electrolytic capacitors (4x 330uF 25V and 2x 2700uF 6.3V) and one blown IC controller (TOP234YN)
I replaced them all, and I also checked the components (two ceramic caps, two rectifier diodes) near the IC for wrong values, etc., and they all passed.
Plugged in the AC power cable, and nothing happened.
Another check with my multimeter, I found the main fuse (Littelfuse 382 cylinder fuse rated 2A 250V) has no continuity. So I pulled it out.
Because I don't have a suitable replacement fuse yet, I thought I'd be able to continue checking the power supply if I temporarily re-establish the fuse connection by soldering in a piece of thick wire (bad idea?)
Plugged in the AC power cable again. DC output power LED indicator turned on! and my house circuit breaker tripped!
Any ideas why it happened?
After I opened the case, I saw six bulging electrolytic capacitors (4x 330uF 25V and 2x 2700uF 6.3V) and one blown IC controller (TOP234YN)
I replaced them all, and I also checked the components (two ceramic caps, two rectifier diodes) near the IC for wrong values, etc., and they all passed.
Plugged in the AC power cable, and nothing happened.
Another check with my multimeter, I found the main fuse (Littelfuse 382 cylinder fuse rated 2A 250V) has no continuity. So I pulled it out.
Because I don't have a suitable replacement fuse yet, I thought I'd be able to continue checking the power supply if I temporarily re-establish the fuse connection by soldering in a piece of thick wire (bad idea?)
Plugged in the AC power cable again. DC output power LED indicator turned on! and my house circuit breaker tripped!
Any ideas why it happened?