Flashing screen on iBook

[mlwright]

Hello:

I have a graphite 466 MHz iBook that occasionally has a flashing screen, where the screen will go white momentarily, and repeat this several times for a few minutes, then may not have this happen again for hours.

Already zapped P-RAM, reset power manager, rebuilt desktop, started up with extensions off (still does it using only base extensions). No new software or hardware has been added to the system since this started happening.

The symptom occurs regardless of whether on the battery or AC outlet. Doesn't seem to matter which applications are open, or whether the applications that are open require much memory. Memory allocations have been changed to see if that has any positive effect, but no.

Thanks in advance for any help.

Merrick

 

[PTmon]

Sounds like you've done just about everything you can software-wise. Resetting open firmware is the only thing I can think of. It sounds to me like it's a hardware problem, like either you display isn't connected properly or your video card. Does moving the display make any difference? (Opening it further or closing it slightly?) IF so, I'd definately say it's a hardware isssue. Best of luck,
PT

 

[macgeneral]

I'd agree with the haarware analysis above.
From my experience with the iBook there is occasion where the video card or the TFT display is bad. If you've got warranty than there's a call to Apple to be made. Otherwise this one's a little pricey.

Solutions might be scouring Ebay for a new tft but then you're guessing it's NOT the video card.

You can try jiggling the machine around when this issue occurs and see if it's possible to chake it out. If so, it may be connections.

I've cracked the case on an iBook or two and the bus that passes from the logic board assembly to the tft is pretty slim and looks fragile at best.

Know this isn't what you want to hear. Sorry.

macgeneral
macgeneral@mac.com