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El Macintosh Powerbook 140 fue una de las primeras ordenadores portátiles de Apple. Cuenta con un cable de alimentación grande, batería, bola de seguimiento en lugar de un panel táctil, fue una de las primeras ordenadores. Apple en usar un disquete interno y una altura de teclado ajustable. También fue el primer ordenador portátil en presentar un teclado hacia la parte posterior de la unidad del ordenador.

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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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Solución Elegida

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.

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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.

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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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Jack estará eternamente agradecido.
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