mord
Newbie level 6
I repaired a power supply (laptop adaptor) and it was working fine, next day i tried testing and it blew even after working fine. it utilizes UC3842 and a FET. lately i also repaired a dvd player power and it was okay. during testing after a short time of power off, it blew up while trying to power it up again. What could be causing random blowup at power up? i have experienced a lot of this problem.