Backlight stopped working, but external video is fine
Hi! I've got a 1.2GHZ 12" G4 iBook, and the backlight has stopped working. It was fine, and I installed the OS with the bottom case and shielding off, and then I put the shielding and bottom on, and from that point on, the backlight will not work. External video shows up fine. I tried 3 known-good screen assemblies and screens (including good inverters, cabling, etc.) and none of them showed a backlight, although, again, a faint image is visible, and external video works fine. It almost seems as if I may have done some damage to the machine while putting the lower shielding on?
Lemerise, could this be a "logic board inverter circuitry" issue, and if so, is there anything that can be done?
Thanks!
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I noticed that the little springy copper thing next to the inverter plug is broken off...could this be the microfuse that controls the backlight? I tried taking a tiny piece of copper and bridging the two ends of the copper connectors, but no luck. I think this is the right microfuse though...maybe I need to solder it?
- de rdklinc
Looking further into this, it seems the microfuse is not the copper springy thing, but more likely a tiny fuse-looking object just next to it. It doesn't look especially burnt out though, and even if it was, it's almost too tiny to tell, or to work with.
- de rdklinc
Success! I clamped both ends of the fuse with metal tweezers (probably at the risk or frying myself), and I got a backlight! Now I just need to figure out how to solder the two ends, since the plastic fuse mechanism is between the two posts and will make it tricky.
- de rdklinc