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The Macintosh Powerbook 140 was an early Apple Laptop computer. It features a large power cable, battery, trackball instead of a trackpad, was one of the first Apple computers to use an internal floppy disk, and adjustable keyboard height. It was also the first laptop to feature a keyboard toward the back of the computer unit.

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How do I fix my screen?

Hello. If anyone knows about older Apple computers, I need your help. I recently got an old Macintosh Powerbook 140. I have plugged it in, and when I power it on, I hear the startup sound, and the speakers emit a tone, but the screen displays nothing. I have checked for any visible damage, and there appears to be none. It may be of note that the computer hasn't been used at all for the past 20 years. I do know that the last report of its use was that the screen was a bit touchy. 20 years ago, the screen could only be seen from the correct angle, but now there is nothing. Can anyone help?

I should also note that I have little experience with physical electronics. I work well with technical stuff, but I only have a basic understanding of electronic terms. If you could explain and terms for me, that would be great.

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Update: I have been getting tiny lines of light on the display for just a few seconds. not sure if it means anything but I thought it might be good to know.


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Sounds like a bad inverter. Move the screen back an forth and seem if you can discern anything on the screen.

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I can't see anything on the screen when I tilt it or look from a different angle. i do however know that when it was last used, this solution worked, but it doesn't now.


Proceed as Apple suggest:" No display, but computer appears to operate correctly.

1 Adjust screen contrast.

2 Check display cable, inverter board, interconnect board, daughterboard, and motherboard connections.

3 Replace inverter board.

4 Replace interconnect board.

5 Add shim to display cable. Refer to Additional Procedures.

6 Replace power cable.

7 Replace display cable.

8 Replace FSTN display (all repairers) or replace activematrix

display (CPRC/ international repairers only).

9 Replace daughterboard.

10 Replace motherboard.


Ok. Could you explain some of the terms for me? I'm not great with the technical terminology. Also, I only have one external cable. It's the power cable. Should I have more?


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very common failure in these machines : LCD caps and inverter caps are gone , must recap lcd screen and inverter with new capacitors , i solved this problem with all my powerbooks 140-145b-160

see this video :

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