Video

Partial or full row of pixels is always on or never comes on in an active matrix display

Display is very light or totally white

Note: A certain number of defects are inherent in display technology and vary by many factors, including type of technology. If you suspect that your display contains an abnormal number of defects, call Apple Technical Support.

1 Check display and backlight cables and connections.

2 Replace display.

3 Replace logic board.

1 Adjust screen contrast and brightness settings.

2 Verify cable, inverter board, and logic board connections.

3 Replace inverter board.

4 Replace display.

5 Replace logic board.

Display stopped working or dimmed but is fine now

1 PowerBook 1400cs: If temperature is under 0° C or over 50° C, this reaction is normal. Let screen warm up for 30 minutes. If symptom persists, replace display.

2 PowerBook 1400c: Replace display.

Backlight doesn't operate

1 Adjust screen contrast and brightness settings.

2 Verify that backlight cable connection is secure.

3 Check cable, inverter board, and logic board connections.

4 Verify that cables are not pinched or severed.

5 Replace inverter board.

6 Replace display.

7 Replace logic board.

No display, but Note: If the sleep light is blinking and the computer is not in computer appears to sleep mode, reset the power manager. operate correctly

1 Insert a disk into the floppy drive and press Command-E (to eject a disk) to verify that computer is working.

2 Adjust screen contrast and brightness settings.

3 Verify display cable, inverter board, trackpad, keyboard, and logic board connections.

4 Connect power adapter.

5 Replace inverter board.

6 Replace display.

7 Replace logic board.

Thin white line is 1

always on at middle of 2 screen

PowerBook 1400cs:Thin white line is normal. PowerBook 1400c: Change the desktop pattern; if the line remains, replace display.

An external monitor connected to the PowerBook shows no video

Verify cable and cable connections between monitor and video board.

Reseat video board and retest. Replace video board.

An external monitor connected to the PowerBook shows either horizontal or vertical rolling, or horizontal or vertical distortion

1 Verify monitor using another computer.

2 Replace video board.

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