Hi! ASUS PSU block ADP-90CD DB blow up and shorted. The main breaker also popped! When I peeled open the casing, I found out that the electrolytic capacitor had blown. Ordered a cheap replacement in hopes of having a spare PSU block after a simple fix. When I replaced the electrolytic capacitor and tested the unit, everything worked as it should.
Electrolytic caps are usually one of the components that go first in electronics, so I wasn’t surprised that the capacitor failed. Out of curiosity more than anything, I measured the voltage on the capacitor ,and it was nearly 500V, but, the capacitor is rated 450V!?!? This can’t be normal!! After searching online for PSU model, I found this post in Russian with exactly the same damage except in this case, the PSU failed in open circuit mode!
https://easywork.com.ua/remont-bloka-pitaniya-asus-adp-90cd-db-2.htmlAs far as I can understand, while using Google translate and my minimal understanding of electronics, the author of this post simply replaced the capacitor same as me and called it done? In this case, there is 464V on the capacitor. So, my question is … is it ok to call PSU fixed and use it as it is?
The author of the post also links to a Russian forum where there is more discussion about this exact problem and it looks like power correction could be the cause of this problem.