At startup, screen lights up and immediately turns off. (Pismo)

There is a problem: when I turn on my PowerBook G3 Pismo, the backlight lamp lights up for approximately 2 seconds and then turns off. Powerbook continues to starts up and loads MacOS 9 normally BUT WITH BACKLIGHT OFF! The LCD panel 100% works because I can see operating system interface on it when I light up it by table lamp
I've checked all connection cables – one on right side on inverter board WAS BROKEN (it become broken after many times of open/close display), I've fixed it, cover it in heat-shrink tube very accurately, but problem not solved....

andrey,
Since you know your way around the Pismo, I would next try replacing the inverter board and/or inverter cable.
Since you mentioned repairing the inverter cable, are you sure the inverter cable is still not the issue, especially where it passes through the clutch (hinge)?
The inverter converts the low-voltage DC to high-voltage AC to power the fluorescent backlight; it could be opening a circuit as it quickly heats up.
The inverter is very inexpensive and very easy to replace. I have not priced the cable but it will be a more extensive repair.

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At startup, screen lights up and immediately turns off. (Pismo)

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