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Troubleshooting Symptom Charts/Video
(Continued)
- 9
Video
(Continued)
Backlight doesn’t
operate
1 Verify that backlight cable connection is secure.
2 Check cable, inverter board, interconnect board,
daughterboard, and motherboard connections.
3 Verify that cables are not pinched or severed.
4 Replace inverter board.
5 Replace interconnect-to-inverter cable.
6 Replace interconnect board.
7 Replace interconnect-to-display cable.
8 Replace display.
9 Replace daughterboard.
10 Replace motherboard.
Thin white line is
always on at middle of
screen
PowerBook 520/520c: Thin white line is normal.