You're at a tough point in the repair. It's one of three things at this point, the Display Data cable, the inverter board or the LCD and no way to know which one it is. I would start with the cheapest, the Display Data Cable: http://www.ifixit.com/PowerBook-Parts/G4-Aluminum-12-Inch-Display-Data-Cable/IF153-051
Here's the inverter: http://www.ifixit.com/PowerBook-Parts/G4-Aluminum-12-Inch-Display-Inverter/IF153-052
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And the available LCD's: http://www.ifixit.com/Mac-Parts/PowerBook-G4-Aluminum-12%22-1-1.5-GHz#0-LCDs
You're at a tough point in the repair. It's one of three things at this point, the Display Data cable, the inverter board or the LCD and no way to know which one it is. I would start with the cheapest, the Display Data Cable: http://www.ifixit.com/PowerBook-Parts/G4-Aluminum-12-Inch-Display-Data-Cable/IF153-051
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Here's the inverter: http://www.ifixit.com/PowerBook-Parts/G4-Aluminum-12-Inch-Display-Inverter/IF153-052
You're at a tough point in the repair. It's one of three things at this point, the Display Data cable, the inverter board or the LCD and no way to know which one it is. I would start with the cheapest, the Display Data Cable: http://www.ifixit.com/PowerBook-Parts/G4-Aluminum-12-Inch-Display-Data-Cable/IF153-051