PowerBook 165c Recapping List

[JDW]

Hey, @techknight . Your video here shows a recapping list for the PowerBook 165c at time stamp 14:39.

You bought YAGEO ESS106M063AE2EA to replace the seven 10uF 63V "Low Profile" caps inside the display:
Height (Length): 7mm (which your video shows "just barely clears")
Diameter: 6.3mm
Lead Spacing: 2.5mm
Hour Rating: 1000
ESR: 10Ω?

But if ultra low ESR is acceptable, Mouser has the following POLYMER replacement candidate that will never leak and is 2mm shorter too:

KYOCERA AVX RPF0605100M063K
Height (Length): 5mm (same height as stock caps)
Diameter: 6.3mm
Lead Spacing: 2.5mm
Hour Rating: 5000
ESR: 66mΩ

Thoughts?

It could be that super low ESR won't matter because I noted your 2 replacement caps for the Brightness/Contrast slider PCB seemed to work fine and they are Wurth 870056174001 10uF 80V Polymer (Mouser says "electrolytic" in 3 places, but that is in ERROR):
Height (Length): 8mm
Diameter: 8mm
Lead Spacing: 3.5mm
Hour Rating: 2000
ESR: 45mΩ

 

[JDW]

No reply came to my opening post after several days of waiting, so I proceeded to order the exact Yageo, Kyocera and Wurth caps I mentioned. They arrived today and I measured them as shown below because there are always differences from published specs on Mouser:

YAGEO ESS106M063AE2EA
PURPOSE: Recapping of LCD in PB165c (TechKnight used these)
TYPE: Electrolytic
Height (Length): 7.7mm (which is 0.7mm longer than part specifications state)
Diameter: 6.3mm
Capacitance @120Hz: 8.92uF ~ 9.17uF (range of 4 caps measured)
ESR @ 120Hz: 2.7Ω ~ 3.8Ω (range of 4 caps measured)
ESR @ 1kHz: 1.21Ω ~ 1.91Ω (range of 4 caps measured)
ESR @ 10kHz: 864mΩ ~ 1.36Ω (range of 4 caps measured)

KYOCERA AVX RPF0605100M063K
PURPOSE: Recapping of LCD in PB165c
TYPE: Polymer (better than the Yageo above because these won't ever leak)
Height (Length): 5.6mm (shorter and therefore better than the Yageo)
Diameter: 6.3mm
Capacitance @120Hz: 9.32uF ~ 9.43uF (range of 4 caps measured)
ESR @ 120Hz: 1.3Ω ~ 1.4Ω (range of 4 caps measured)
ESR @ 1kHz: 210mΩ ~ 240mΩ (range of 4 caps measured)
ESR @ 10kHz: 57mΩ ~ 76Ω (range of 4 caps measured)

Wurth 870056174001
PURPOSE: Recapping of DC-DC Board in PB165c (TechKnight used these)
TYPE: Polymer
Height (Length): 8.9mm
Diameter: 8.2mm
Capacitance @120Hz: 9.4uF ~ 9.57uF (range of 4 caps measured)
ESR @ 120Hz: 1.2Ω ~ 1.4Ω (range of 4 caps measured)
ESR @ 1kHz: 170mΩ ~ 220mΩ (range of 4 caps measured)
ESR @ 10kHz: 28mΩ ~ 45Ω (range of 4 caps measured)


ANALYSIS
The stock caps on the 165c's DC-DC board (with brightness/contrast sliders) have a nominal 8.2uF capacitance, which leads us to wonder why Apple didn't choose a more standard 10uF capacitor instead. It could be that the capacitance value was important. But no too important because they used 20% tolerance capacitors.

8.2uF 20% tolerance allows a capacitance range of 6.56uF to 9.84uF. @techknight seemed to have no issue with his use of those Wurth capacitors. My guess is that his caps had the same measured capacitance range as mine (at 120Hz). And as you can see from my measured range, all fall within the 20% tolerance of the stock 8.3uF capacitors. This is no guarantee the Wurth capacitors you buy will be within that same range, but in my experience with Wurth capacitors, they tend to be on the low side of their nominal capacitance spec, so it could be the range would be about what I measured.

What if the replacement caps for the DC-DC board are outside the 20% tolerance range of the stock 8.2uF caps? Unknown until tested, but I doubt it would make a huge difference. Maybe it would impact how slow or fast the brightness and contrast sliders work as you move them? Not sure.

I've not installed anything yet. This is just a measurement report and analysis prior to my recap.