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Model M8407 / 550 or 667 MHz G4 processor

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C1 capacitor for Powerbook G4 Titanium Onyx 550

I have an Onyx 550 showing no signs of life (light ring on power plug doesn't even light). Swapping in a known-good logic board confirms that something on the board is the problem. The C1 capacitor rattles when I shake the board, so I'm thinking it has dried out and simply replacing that might fix the problem. Do you know the full specs of the C1 capacitor?

Some specs I can read/see on the cap:

  • surface mount design
  • Rubycon (manufacturer)
  • 220 uF
  • 35 V
  • 105 degrees C (apparently the top end of the rated operating temperature range)
  • NO144 (not sure if that's exactly what it says or what it means)
  • 10 mm diameter and 10 mm high
  • presumably this is an aluminum electrolytic type

If I have all that right, then it narrows down the selection of caps at Mouser pretty well.

But there is at the least a question of the low-end temperature rating, and beyond that I would be happy to have someone confirm my overall assessment above.

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Hi

to try if the cap is the problem you can replace the cap with a "normal" electrolytic cap with 220µF and 35V and solder it to the SMD solder pads. If the board works again you can go for a SMD cap and replace the test cap. For the test cap you dont have to go for a 105°C model, as it is only for short term testing.

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jdhupp will be eternally grateful.
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