I poked thru all 25 pages of the BB and didn't find a solution so I thought I'd give posting a shot.

.

The iBook's LCD boots up to pale gray/ white screen with no image at all,

the backlight does come on, it dips when it goes to sleep or an external monitor is attached.

.

The computer runs perfectly on an external monitor.

The screen is not black, the fan does not run-on, putting pressure on the "video chip" has no effect.

.

This started out of nowhere. It worked fine one day and was dead the next, no bumps or bangs or errant beverages.

.

Hardware things I tried:

-replacing the LCD

-replacing the LCD ribbon cable

-replacing the LCD inverter

-replacing the LCD inverter cable

-remove the memory chip

.

Inspections:

-The solder joints on the ISL 6225CA chip look fine.

-The jacks on the logic board for the LCD and the LCD inverter appear to be good.

-No bulged or discolored chips.

.

Software stuff:

-Apple Hardware Test disk found no problems.

-TechTool found no problems.

-Repairing permissions, zapping the Pram, NVram and all the stock software pimp-slaps didn't help.

-Starting in "Target Mode" leaves me with a black screen, no backlight.

- (it does show the Firewire logo on a blue screen if I plug in the external monitor)

-The F1 & F2 buttons have no effect on the appearance.

-It really felt like a software issue so I did a "Clean Install", no help.

.

Anybody got any ideas?

[quote|marcucco]I poked thru all 25 pages of the BB and didn't find a solution so I thought I'd give posting a shot. . The iBook's LCD boots up to pale gray/ white screen with no image at all, the backlight does come on, it dips when it goes to sleep or an external monitor is attached. . The computer runs perfectly on an external monitor. The screen is not black, the fan does not run-on, putting pressure on the "video chip" has no effect. . This started out of nowhere. It worked fine one day and was dead the next, no bumps or bangs or errant beverages. . Hardware things I tried: -replacing the LCD -replacing the LCD ribbon cable -replacing the LCD inverter -replacing the LCD inverter cable -remove the memory chip . Inspections: -The solder joints on the ISL 6225CA chip look fine. -The jacks on the logic board for the LCD and the LCD inverter appear to be good. -No bulged or discolored chips. . Software stuff: -Apple Hardware Test disk found no problems. -TechTool found no problems. -Repairing permissions, zapping the Pram, NVram and all the stock software pimp-slaps didn't help. -Starting in "Target Mode" leaves me with a black screen, no backlight. - (it does show the Firewire logo on a blue screen if I plug in the external monitor) -The F1 & F2 buttons have no effect on the appearance. -It really felt like a software issue so I did a "Clean Install", no help. . Anybody got any ideas?[/quote]