Burned step down transformer 220v to 110v

Thread Starter

dirarko

Joined Oct 7, 2020
4
Hello,

I have bought a Wii console with a non working power adapter. After checking out the adapter I found that the issue was that it has a 120v input and probably was plugged in a 220v.
To fix it, I replaced a Varistor, a Fuse and a 200v 180uf Capacitor. The power adapter is rated at 120v and 51W. So after replacing the parts I plugged it in the AC convertor shown in the picture below, and in about 10 seconds I started smelling burning plastic then the fuse blew and the AC convertor started smoking! Now I have a burned out adapter and convertor. Anyone can explain why this happened

Thanks
 

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Thread Starter

dirarko

Joined Oct 7, 2020
4
Yes. Some components fail opened, others can failed shorted. If something shorted power, that could cause the symptoms you observed.
yeah, I think the convertor is beyond repair? any tips what I should check in the power adapter?
 

dl324

Joined Mar 30, 2015
11,914
yeah, I think the convertor is beyond repair?
Don't have enough information to say one way or another.
any tips what I should check in the power adapter?
  1. Look for obviously damaged parts.
  2. Draw a schematic so we can tell what you're working with.
  3. Use an autotransformer (often called Variacs, which is a brand name) to bring the device up with a lower voltage. Be aware that an autotransformer usually removes line isolation (e.g. safety).
  4. Add additional current limiting while troubleshooting.
 

Thread Starter

dirarko

Joined Oct 7, 2020
4
The transformer has started to work alone. At the beginning is has a very low voltage output, but two days later it's working.

Don't have enough information to say one way or another.

  1. Look for obviously damaged parts.
  2. Draw a schematic so we can tell what you're working with.
  3. Use an autotransformer (often called Variacs, which is a brand name) to bring the device up with a lower voltage. Be aware that an autotransformer usually removes line isolation (e.g. safety).
  4. Add additional current limiting while troubleshooting.
Thanks
 
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