Highway of Life
Registered
It started happening two nights ago.
All the sudden my backlight shut off.
It did not go to sleep, and the screen was still on, I could put a flash light through the back and see items on the screen.
So I plugged in an external monitor, and my backlight instantly came back on. But after a few seconds it turned off again.
If I change the display settings it will come on again, and after a random amount of time, the back light will turn off.
Same thing if I turn mirroring on or off, it will come back on, and after some time, it will turn off again, usually within 30 seconds.
Same thing if I put the Powerbook to sleep, then wake it up, the Backlight will come on, and after some time, shut off again.
On occasion, I can be working on it for about 15 - 20 minutes before it will shut off.
If the Powerbook awakes from sleep and I don't touch it for over an hour, it will stay on. But then as soon as I start working on it, after a few seconds the backlight will turn off again.
I found a thread on apple discussions addressing a similar issue, so I tried a few of the tips: First I trashed the com.apple.finder file, then reset the PRAM. It still did not work, so I reset the PMU, then reset the PRAM again, and promptly repaired permissions.
Still no change.
Every-time the Powerbook starts up, or wakes up from sleep, the backlight will be on, then shut off after a number of seconds or minutes.
Nobody ever talks on the apple discussions so it's almost impossible to get any more help there.
Tonight, I took the Powerbook apart and checked all internal connections.
After putting it back together, I noticed no change in the behavior.
Any tips?
Thanks in advance,
- Highway
System stats:
Machine Model: PowerBook G4 15"
CPU Type: PowerPC G4 (3.2)
CPU Speed: 867 MHz
L2 Cache (per CPU): 256 KB
L3 Cache (per CPU): 1 MB
Memory: 768 MB
Bus Speed: 133 MHz
HD Capacity: 40GB
External Firewire/USB Drives: None
Internal Cards: None
PCMCIA Cards: Wifi adaptor
System Software: Mac OS X 10.3.7
VRAM: 32 MB
Display
ATY,RV250M9:
Type: display
Bus: AGP
VRAM (Total): 32 MB
Vendor: ATI (0x1002)
Device ID: 0x4c66
Revision ID: 0x0001
ROM Revision: 113-xxxxx-106
Display:
Type: display
Display Type: LCD
VRAM (In Use): 16 MB
Resolution: 1024 x 768
Depth: 32-bit Color
Stretched: Yes
Mirror Status: Hardware Mirror
Online: Yes
Mirror: On
Display:
Type: display
Display Type: NONE
VRAM (In Use): 16 MB
Resolution: 1024 x 768 @ 60 Hz
Depth: 32-bit Color
Main Display: Yes
Mirror Status: Master Mirror
Online: Yes
Mirror: On
All the sudden my backlight shut off.
It did not go to sleep, and the screen was still on, I could put a flash light through the back and see items on the screen.
So I plugged in an external monitor, and my backlight instantly came back on. But after a few seconds it turned off again.
If I change the display settings it will come on again, and after a random amount of time, the back light will turn off.
Same thing if I turn mirroring on or off, it will come back on, and after some time, it will turn off again, usually within 30 seconds.
Same thing if I put the Powerbook to sleep, then wake it up, the Backlight will come on, and after some time, shut off again.
On occasion, I can be working on it for about 15 - 20 minutes before it will shut off.
If the Powerbook awakes from sleep and I don't touch it for over an hour, it will stay on. But then as soon as I start working on it, after a few seconds the backlight will turn off again.
I found a thread on apple discussions addressing a similar issue, so I tried a few of the tips: First I trashed the com.apple.finder file, then reset the PRAM. It still did not work, so I reset the PMU, then reset the PRAM again, and promptly repaired permissions.
Still no change.
Every-time the Powerbook starts up, or wakes up from sleep, the backlight will be on, then shut off after a number of seconds or minutes.
Nobody ever talks on the apple discussions so it's almost impossible to get any more help there.
Tonight, I took the Powerbook apart and checked all internal connections.
After putting it back together, I noticed no change in the behavior.
Any tips?
Thanks in advance,
- Highway
System stats:
Machine Model: PowerBook G4 15"
CPU Type: PowerPC G4 (3.2)
CPU Speed: 867 MHz
L2 Cache (per CPU): 256 KB
L3 Cache (per CPU): 1 MB
Memory: 768 MB
Bus Speed: 133 MHz
HD Capacity: 40GB
External Firewire/USB Drives: None
Internal Cards: None
PCMCIA Cards: Wifi adaptor
System Software: Mac OS X 10.3.7
VRAM: 32 MB
Display
ATY,RV250M9:
Type: display
Bus: AGP
VRAM (Total): 32 MB
Vendor: ATI (0x1002)
Device ID: 0x4c66
Revision ID: 0x0001
ROM Revision: 113-xxxxx-106
Display:
Type: display
Display Type: LCD
VRAM (In Use): 16 MB
Resolution: 1024 x 768
Depth: 32-bit Color
Stretched: Yes
Mirror Status: Hardware Mirror
Online: Yes
Mirror: On
Display:
Type: display
Display Type: NONE
VRAM (In Use): 16 MB
Resolution: 1024 x 768 @ 60 Hz
Depth: 32-bit Color
Main Display: Yes
Mirror Status: Master Mirror
Online: Yes
Mirror: On