OMG!
I could have been killed by my own speedlight!
Ok, I've been wanting to MOD one of my small flash unit for a long time and finally got about doing it. In the process, I had a small price to pay.
I screwed up on wiring the connections so I pried open again for a second attempt.
It was quite tough to take the flash apart and while I was struggling at it, a sudden loud 'pop' like firecrackers startled me to death! I was quite shocked by it and didn't quite expect anything like that. I emptied the battery compartment before meddling with it.
So, I lost one good flash on this attempt.
I still had another flash unit to continue on this mayhem modifications!
This time, it's a success.
the mod

R.I.P
good ol' Canon 540EZ