I have the non backlit. Here is the chip circled in the photo you gave. Your's appear to be a different model of IC but they do the same thing. Just like my ram is a different manufacturer, but both are from Japan. Under your photo is a photo of mine.
My portable's
Doesn't mean nothings wrong. My macintosh portable boots to the qusetion mark too (even with a BLUESCSI connected). But somethings wrong. I pressed the interrupt button and it gave me errors. Some of the pin on a chip in the board have come loose and arn't connected to the board.
Are there any...
Have you replaced the capacitors? Have you flowed the solder over them? If you do Flow the solder you can hear if the capacitor has leaked because the capacitor juice burns off depending on if your caps have leaked or not.
OH, If you find out what was wrong please let me know! I'm trying to find the same problem on mine. I discovered that the DS3691V ic was coming desoldered from the board. I am still waiting for flux and solder wick to show up so that I can fix it. If I find out what was wrong I'll let you know...