Capacitor Reference - Macintosh LC III
All of the following are surface-mount electrolytic cans that need to be replaced.
Logic Board
- 1x 100uf 6.3v
- 5x 47uf 16v
- 5x 10uf 16v
Power Supply
The LC III used power supplies from three different vendors - TDK, Astec, and Dyna Comp. All three are known to need recapping, but the TDK is by far the worst in this regard. It used ELNA LongLife series capacitors which leak worse than any others from this time. A TDK should be a recap on sight - the others are up to your discretion, but I'd still recommend it.
TDK
There's an excellent writeup here on 68kmla with component reference, photos, and more
| Value | Count | Type |
|---|---|---|
| 1000uf 10v | 3 | Radial Electrolytic |
| 270uf 25v | 2 | Radial Electrolytic |
| 270uf 25v | 1 | Radial Electrolytic |
| 180uf 385v | 1 | Radial Electrolytic |
| 56uf 25v | 1 | Radial Electrolytic |
| 47uf 25v | 1 | Radial Electrolytic |
| 8.2uf 50v | 1 | Radial Electrolytic |
Astec
There were at least two different versions of the Astec supply - check your model number before ordering caps.
Astec (AA16251)
Photos and more info available here.
| Value | Count | Type | Width | Height | Pitch |
|---|---|---|---|---|---|
| 2200uf 10v | 2 | Radial Electrolytic | 13mm | 20mm | 4mm |
| 1200uf 16v | 1 | Radial Electrolytic | 13mm | 20mm | 4mm |
| 1000uf 10v | 1 | Radial Electrolytic | 10mm | 20mm | 4mm |
| 470uf 16v | 1 | Radial Electolytic | 8mm | 8mm | 3-4mm |
| 180uf 400v | 1 | Radial Electrolytic | 30mm | 25mm | 10mm |
| 120uf 10v | 2 | Radial Electrolytic | 5mm | 13-14mm | 4mm |
| 47uf 25v | 1 | Radial Electrolytic | 6mm | 11-12mm | 2-3mm |
Astec (AA19140)
| Value | Count | Type |
|---|---|---|
| 1200uf 16v | 1 | Radial Electrolytic |
| 1200uf 10v | 3 | Radial Electrolytic |
| 470uf 16v | 1 | Radial Electrolytic |
| 180uf 400wv | 1 | Radial Electrolytic |
| 120uf 25v | 2 | Radial Electrolytic |
| 47uf 35v | 1 | Radial Electrolytic |
Dyna Comp
There is a mouser BOM for this supply available here.
| Capacitor | Value | Temp Rating | Type |
|---|---|---|---|
| C7 | 180uf 400v | 85c | Radial Snap-In Electrolytic |
| C9 | 33uf 35v OR 22uf 35v (check yours!) | 105c | Radial Electrolytic |
| C15 | 330uf 35v | 105c | Radial Electrolytic |
| C16 | 82uf 35v | 105c | Radial Electrolytic |
| C18 | 2200uf 10v | 105c | Radial Electrolytic |
| C19 | 1000uf 10v | 105c | Radial Electrolytic |
| C20 | 1000uf 10v | 105c | Radial Electrolytic |
| C21 | 82uf 35v | 105c | Radial Electrolytic |
| C22 | 82uf 35v | 105c | Radial Electrolytic |
| C26 | 10uf 35v | 85c | Radial Electrolytic |
Reference Image (Logic Board)
Click image below to view the full-resolution version.
Astec AA19140 Power Supply
Image from iiiDIY - thank you!
Page last updated (MM/DD/YYYY): 12/12/2024
Update Reason: psu info updated
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