fried driver?

[sperocket]

Hi everyone, I messed up and put the batteries in backwards on my 445nm 9mm diode with 2.4 amp buck X-drive. So it didn't turn on. then I figured out what my dumba$$ had done. After reading for a few hours I figured it was probably just the driver I fried so I ordered another from DTR. When I took it apart I could see no physical damage. Nothing melted or burnt looking. Could it be bad and not see anything on the surface? I am hoping the diode is still good. Thanks for any of your help. I guess I should probably remove the diode and put a test load on it to test it?

 

[Pi R Squared]

Here is something DTR posted in this thread: http://laserpointerforums.com/f65/my-dominator-has-died-88540.html
See the photo, the damage might not always be very noticeable.

Not sure what driver he is using but it drawing 5mA or so sounds like what the X-drive draws when it has been blown with reverse current. Any chance the batteries were ever put in backwards?

When that is done with the X-drive it does not kill the diode but the driver would need to be replaced. Not that expensive of a fix but I am not sure if that is the driver he is using.

If it is an X-drive you can confirm by looking at the 8 pin chip it will have a small circular burn mark in the lower corner. It is the most common damage I see the 9mm modules with X-drive take but the diode always survives which is good. It will look like this.

Alan

 

[10fenny]

you wont really know for sure if its fried unless you either swap it or put a load test to it.. but most likley fried the driver.

 

[sperocket]

Thanks for the responses. I guess I'll remove the diode and test it with a 2amp load. Would a 4 ohm 5 watt resistor be good enough for a test load?