I have an HK avr 520 2002 model that turns on for a second then shuts off...I have tried the reset with no luck and replace 4 large caps inside that seemed swellwd on the top. don't think that pico fuses were used because I cant find any in it and even looked on the parts list and don't see any listed. What can be causing this and how do I test it? Any help is appreciated! Thanks!