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Versión actual por: lemerise ,

Texto:

Since you get video on an external device the PB graphic card (logic board) should be OK. Now we need to troubleshoot the LCD display assembly.
First: use a flashlight or a lamp to lighten the white Apple logo on the display back panel and check if you see a faint image of the desktop onscreen. If so then you have a screen lightning problem. This can be caused by:
- disconnected or loose inverter cable connector to the logic board or to the inverter board.
- damaged inverter cable (or reed switch board / cable, the PB display sleep system)
http://www.ifixit.com/PowerBook-Parts/G4-Aluminum-17-Inch-Inverter-and-Antenna-Cables/IF155-051
- faulty inverter board
http://www.ifixit.com/PowerBook-Parts/G4-Aluminum-17-Inch-Display-Inverter/IF155-048
- faulty backlight fluorescent tube (CCF lamp that lighten the LCD panel)
- in rare occasions: faulty inverter circuitry on the logic board
If you don't see a faint desktop image onscreen then the two sub systems (video and lightning) are failing (rare IMHO) and the LCD panel need to be replaced.
http://www.ifixit.com/PowerBook-Parts/G4-Aluminum-17-Inch-1-67-GHz-HR-LCD-Only/IF155-071
+
+A TV set has less image resolution than an external LCD monitor that's why you don't have a good image quality. Connect the PB on a DVI external monitor and you'll get full quality.

Estatus:

open

Aporte original por: lemerise ,

Texto:

Since you get video on an external device the PB graphic card (logic board) should be OK. Now we need to troubleshoot the LCD display assembly.

First: use a flashlight or a lamp to lighten the white Apple logo on the display back panel and check if you see a faint image of the desktop onscreen. If so then you have a screen lightning problem. This can be caused by:

- disconnected or loose inverter cable connector to the logic board or to the inverter board.

- damaged inverter cable (or reed switch board / cable, the PB display sleep system)

http://www.ifixit.com/PowerBook-Parts/G4-Aluminum-17-Inch-Inverter-and-Antenna-Cables/IF155-051

- faulty inverter board

http://www.ifixit.com/PowerBook-Parts/G4-Aluminum-17-Inch-Display-Inverter/IF155-048

- faulty backlight fluorescent tube (CCF lamp that lighten the LCD panel)

- in rare occasions: faulty inverter circuitry on the logic board

If you don't see a faint desktop image onscreen then the two sub systems (video and lightning) are failing (rare IMHO) and the LCD panel need to be replaced.

http://www.ifixit.com/PowerBook-Parts/G4-Aluminum-17-Inch-1-67-GHz-HR-LCD-Only/IF155-071

Estatus:

open