[Ti] Help Request for TiBook 800MHz LCD problem

[Kynan Shook]

You're mistaken here; the inverter controls the backlight for the  
internal LCD, and not the video signal.  It takes the DC power  
available in the computer and converts it to high-frequency, high- 
voltage AC power suitable for driving the cold cathode fluorescent  
lamp used as a backlight; hence why there is a large transformer on  
the board, and a single two-wire cable leading from it into the display.

 From my experience working at an Apple-Authorized Service Provider,  
the inverter board rarely fails.  Typically, the backlight will burn  
out first.

As far as the original poster's issue, it is almost certainly either  
the video cable or the display itself.

Ralph Lewis <maccare at gwi.net> writes:
> The inverter board controls the video signal, not the backlight, if
> there is no video, but the external display is OK, the inverter board
> is the probable culprit.