light at the end of the cluster

[aussie4life]

Hey guys. just wandering if anyone would have any ideas as to why my backlighting in my lcd screens has died? level 3 conversion done by myself. had a couple of blown globes, so i changed them out which is when they stopped working. i had it all appart just now because of a dodgie connection i found when i put my new switchblock in. all connections are clean and tight. tested the 4 globes plus swapped them out with other ones that tested ok and worked when i put power thru them.

any idea why they would have just stopped all of a sudden. they are standard globes so no polarity, works either way.

cheer in advance