Macintosh LC III+ Capacitor Replacement Guide: Difference between revisions
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Replacing the electrolytic capacitors (recapping) in the '''Macintosh LC III+''' is essential for long-term reliability. | Replacing the electrolytic capacitors (recapping) in the '''Macintosh LC III+''' is essential for long-term reliability. | ||
Revision as of 21:52, 21 September 2026
 | The component values and measurements on this page have not been verified against a service manual or schematic. This page is part of a set flagged during a wiki-wide audit. Spot checks found incorrect capacitance values and under-specified voltage ratings on some pages in this set. Do not order parts based on this page alone — check the values against your board's silkscreen and against a schematic or service manual before buying or fitting anything. |
Replacing the electrolytic capacitors (recapping) in the Macintosh LC III+ is essential for long-term reliability.
Known Factory Defect: C22
Important: Like the LC III, the Macintosh LC III+ has a known manufacturing defect where capacitor C22 was installed with reversed polarity at the factory. The silkscreen marking on the PCB is printed backwards.
When replacing capacitors, install C22 with correct polarity according to the capacitor's markings, not the PCB silkscreen.
Symptoms of Capacitor Failure
- No audio — Most common early symptom
- Distorted or crackling audio
- Boot failures or instability
- Visible electrolyte leakage — Brown or black residue around capacitors
- Corrosion on PCB traces
Capacitor List
Logic Board Capacitors
The LC III+ uses the same capacitor layout as the LC III.
| Designator | Capacitance | Voltage | Notes |
|---|---|---|---|
| C1 | 1 µF | 50V | |
| C2 | 1 µF | 50V | |
| C3 | 10 µF | 16V | |
| C4 | 10 µF | 16V | |
| C5 | 10 µF | 16V | |
| C6 | 10 µF | 16V | |
| C7 | 47 µF | 16V | |
| C8 | 47 µF | 16V | |
| C9 | 47 µF | 16V | |
| C10 | 47 µF | 16V | |
| C11 | 47 µF | 16V | |
| C12 | 47 µF | 16V | |
| C13 | 47 µF | 16V | |
| C14 | 47 µF | 16V | |
| C15 | 100 µF | 6.3V | |
| C16 | 100 µF | 6.3V | |
| C17 | 100 µF | 6.3V | |
| C22 | 47 µF | 16V | Factory reversed polarity — install correctly! |
Power Supply Capacitors
Refer to the Macintosh LC Power Supply Recap Guide for PSU-specific information.
Capacitor Replacement Procedure
Tools Required
- Temperature-controlled soldering iron (recommended: 300-350°C)
- Fine tip for SMD work
- Desoldering braid or solder wick
- Flux (no-clean recommended)
- Isopropyl alcohol (99%)
- Soft brush (ESD-safe)
- Multimeter
- Replacement SMD electrolytic capacitors
Procedure
- Remove the logic board — Disconnect all cables, remove screws, and carefully lift the board.
- Document capacitor positions — Note polarity markings before removal.
- Clean the area — Remove any leaked electrolyte with isopropyl alcohol.
- Remove old capacitors — Heat one pad while gently lifting the capacitor. Alternate between pads.
- Clean the pads — Remove old solder with desoldering braid. Clean with IPA.
- Inspect for damage — Check traces and vias for corrosion.
- Install new capacitors — Observe polarity. For C22: ignore the PCB silkscreen.
- Clean residue — Remove flux with isopropyl alcohol.
- Test continuity — Verify no shorts between +5V, +12V, and ground.
- Reassemble and test
Important Notes
- C22 silkscreen error — The PCB marking is wrong. Install based on the capacitor's polarity marking.
- Polarity matters — SMD electrolytics will fail if installed backwards.
- Use equivalent or better specs — Match capacitance; voltage rating can be equal or higher.
Related Pages
External Resources
- Recap-a-Mac: Macintosh LC III Capacitor Guide (same board as LC III)