PowerBook 100 Capacitor Replacement

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aladds's picture
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Joined: Dec 26 2003
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My Powerbook 100 works, except for a small problem where the screen doesn't show up. I have found out that this is being caused by 8 small electrolytic capacitors on the back of the LCD which have ALL leaked. I have cleaned up the mess, but the capacitors don't work (no picture on LCD).

I need to know the type of capacitor to replace them with. They are all marked "3.3 3.5V" and the polarity is noted below that. Can I use anything that is greater than this? E.G. would a 16V 33uF capacitor work as a suitable replacement? or should I get the voltage as close as possible (6.3V 47uF)?

cheers

aladds

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coius's picture
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Joined: Aug 25 2004
Posts: 1975
there should be

A model/type/serial # on the Caps. If you can, Take one to a radio shack and have a tech look it up. I would think that it should be as close to the original Caps. as possible. if it goes to use the Cap. it could prob get a surge.

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Joined: Dec 20 2003
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The voltage listed on the cap

The voltage listed on the cap is the voltage at which the dielectric breaks down. So it does not hurt to go over.

I always get confused when reading the values on the caps but I think 33uF is correct.

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aladds's picture
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So a 16V 33uF cap is the type

So a 16V 33uF cap is the type to get?

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bengi's picture
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Joined: Aug 2 2005
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a replaced the 8 capacitors...

... and the screen now appears: no longer the dreaded dark blue screen. Then I tested this good LCD with some of the spare logic boards that I have in the basement (http://homepage.mac.com/bengi/PhotoAlbum50.html) and I got the dark blue screen, so it means that the same symptom is shared by two different problems: the 8 caps behing the LCD and something else in the LoBo.
Anybody has gone deeper in this thing?
Ben

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bengi's picture
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Re: a replaced the 8 capacitors...

the two 16 volts, 19 uF, in front of the dispay cable connector on the logic biard, seems indeed responsible: I replaced them and the screen is back to life,

Ben

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PB: 100, 160, 180, 180c, 190, 190c, 5300cs, 5300c, 5300ce B/W 5300ce, 1400c 166, 3500, WS 500 MHz, Aluminium 15: 1.25, 1.5 Hi Res display, 1.67 DL, iBook G3: 12" 500, 800, 14" 900, G4 14" 1.33, MacBook white unibody, Classic: 40MHz 68030, Classic II, Color Classic, SE, SE/30, LC, II, 475, 575, 630, Quadra 700, PowerMac 4400, 7600 G4 1000 MHz, PowerMac 8600 G4 450, PowerMac G3 700 MHz G4 (custom), PowerMac G5 2.0, 2.7 LQ, MacPro 3.2 GHz, MacBook Pro 2013