Josh: Added Recap-a-Mac capacitor location images

2026-02-09T17:03:55Z

Added Recap-a-Mac capacitor location images

← Older revision		Revision as of 18:03, 9 February 2026
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	\| C10 \|\| 100 µF \|\| 6.3V \|\| SMD Electrolytic		\| C10 \|\| 100 µF \|\| 6.3V \|\| SMD Electrolytic
	\|}		\|}

			[[File:Mac LC 475 Recap Guide.jpg\|center\|thumb\|600px\|Macintosh LC 475/Quadra 605 logic board capacitor locations. Source: [https://recapamac.com.au/macintosh-lc475/ Recap-a-Mac]]]

	'''Note:''' The exact designators may vary. Consult a logic board diagram or use values from the existing capacitors.		'''Note:''' The exact designators may vary. Consult a logic board diagram or use values from the existing capacitors.
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	Refer to the [[Macintosh LC Power Supply Recap Guide]] for PSU-specific information. The LC 475 uses a 30W power supply.		Refer to the [[Macintosh LC Power Supply Recap Guide]] for PSU-specific information. The LC 475 uses a 30W power supply.

			[[File:Mac LC PSU Recap Guide.jpg\|center\|thumb\|600px\|Macintosh LC power supply capacitor locations. Source: [https://recapamac.com.au/macintosh-lc-power-supply/ Recap-a-Mac]]]

	== PRAM Battery Upgrade ==		== PRAM Battery Upgrade ==
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	== External Resources ==		== External Resources ==

	* [https://recapamac.com.au/macintosh-lc475~~-quadra-605~~/ Recap-a-Mac: Macintosh LC 475/Quadra 605 Capacitor Guide]		* [https://recapamac.com.au/macintosh-lc475/ Recap-a-Mac: Macintosh LC 475/Quadra 605 Capacitor Guide]

	[[Category:Apple Vintage Computers]]		[[Category:Apple Vintage Computers]]
	[[Category: Capacitor Replacement Guides]]		[[Category: Capacitor Replacement Guides]]

Josh: Create Macintosh LC 475 capacitor guide

2026-02-09T16:45:41Z

Create Macintosh LC 475 capacitor guide

New page

Replacing the electrolytic capacitors (recapping) in the '''Macintosh LC 475''' ensures long-term reliability. The LC 475/Quadra 605 is generally easier to recap than earlier LC models, with fewer capacitors and a simpler layout.

== Symptoms of Capacitor Failure ==

* '''No audio or distorted audio'''
* '''Boot failures or instability'''
* '''Visible electrolyte leakage''' — Less common on LC 475 than earlier LCs
* '''Corrosion on PCB traces'''

== Capacitor List ==

=== Logic Board Capacitors ===

The LC 475 logic board contains fewer surface-mount electrolytic capacitors than earlier LC models.

{| class="wikitable" style="width:80%; text-align:center;"
|+ '''Macintosh LC 475 Logic Board Capacitors'''
|-
! Designator !! Capacitance !! Voltage !! Type
|-
| C1 || 10 µF || 16V || SMD Electrolytic
|-
| C2 || 10 µF || 16V || SMD Electrolytic
|-
| C3 || 10 µF || 16V || SMD Electrolytic
|-
| C4 || 10 µF || 16V || SMD Electrolytic
|-
| C5 || 47 µF || 16V || SMD Electrolytic
|-
| C6 || 47 µF || 16V || SMD Electrolytic
|-
| C7 || 47 µF || 16V || SMD Electrolytic
|-
| C8 || 47 µF || 16V || SMD Electrolytic
|-
| C9 || 100 µF || 6.3V || SMD Electrolytic
|-
| C10 || 100 µF || 6.3V || SMD Electrolytic
|}

'''Note:''' The exact designators may vary. Consult a logic board diagram or use values from the existing capacitors.

=== Power Supply Capacitors ===

Refer to the [[Macintosh LC Power Supply Recap Guide]] for PSU-specific information. The LC 475 uses a 30W power supply.

== PRAM Battery Upgrade ==

When recapping the LC 475, consider upgrading the PRAM battery holder:

* Replace the original 1/2 AA battery holder with a '''CR2032 coin cell holder'''
* CR2032 cells are widely available and easier to replace
* Ensure correct voltage (3V for CR2032 vs. 3.6V for 1/2 AA)—this slight difference is acceptable

== 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.
# '''Remove the CPU''' — The socketed 68LC040 should be removed to prevent damage during work.
# '''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. The stripe on the capacitor indicates negative.
# '''Clean residue''' — Remove flux with isopropyl alcohol.
# '''Test continuity''' — Verify no shorts between +5V, +12V, and ground.
# '''Reinstall CPU''' — Carefully reseat the 68LC040.
# '''Reassemble and test'''

== Important Notes ==

* '''Simpler recap''' — The LC 475 has fewer capacitors and is easier to work on than earlier LCs.
* '''Polarity matters''' — SMD electrolytics will fail if installed backwards.
* '''CPU care''' — Remove the socketed CPU before working to avoid accidental damage.
* '''PRAM battery''' — Consider the CR2032 upgrade while the board is disassembled.

== Related Pages ==

* [[Macintosh LC 475]]
* [[Macintosh LC 475 General Maintenance]]
* [[Macintosh LC 475 Troubleshooting]]

== External Resources ==

* [https://recapamac.com.au/macintosh-lc475-quadra-605/ Recap-a-Mac: Macintosh LC 475/Quadra 605 Capacitor Guide]

[[Category:Apple Vintage Computers]]
[[Category: Capacitor Replacement Guides]]

Macintosh LC 475 Capacitor Replacement Guide - Revision history

Josh: Added Recap-a-Mac capacitor location images

Josh: Create Macintosh LC 475 capacitor guide