Guys, I dont know how I figured it out but I was doing things very stupid way, that car charger was ON every time I power on diode. When I turned of that car charger and connected the diode. Then diodes work flawlesly! :) It was some high open circuit voltage that killed LEDs, I guess so...
Hello, Im sorry tfor reviving this topic, but I fried about 15 leds trying to make LED work with 34063.
Nevermind that, I have about 100 dvd writers that are broken lying around.
What is very confusing for me is that I boufht cheap car charger that is based on 34064 and it outputs about 5.3...