Originally Posted by lex71x
I have a 15'' display with top and bottom backlights, neither of which work. I'm trying to figure out whether it's the inverter or the lights that burned out, so i can replace it, but is there any way to test cold cathode bulbs?
it is highly unlikely that both bulbs went out at the same time although they could be wired in series at the ballast and that would mean if one goes out the other stops working, I have a viewsonic vx2235wm that had its power supply have most of the capacitors going bad and one that was real bad and it would only be able to light the 4 CCFL bulbs for about 2 seconds before it made a buzzing noise and turned off, I replaced all but 1 capacitor that was showing a bulging top and its working fine now.
on my monitor at least the ballast was built into the delta power supply board and had 2 ballast with each top and bottom 2 bulb unit connected to it ttoal of 4 bulbs. I had initially thought that the bulb went out untill i dismantled it noticed the capacitors and then took apart the LCD unit to find 4 bulbs to my surprise
I had to take it apart for a peak after i seen cables going top and bottom with 4 connectors total i was like wtf every small LCD i've seen only had 1 CCFL bulb lol
anyways best of luck fixing it, if its not a laptop I think buying a new monitor would prolly be better anyways cuz a 15" is tiny