Macintosh TV Capacitor Replacement Guide

Replacing electrolytic capacitors (recapping) in your Macintosh TV is essential for long-term reliability. The surface-mount capacitors on the logic board and TV tuner board are particularly prone to leakage, which can cause corrosion and permanent damage to PCB traces if not addressed.

Macintosh TV Capacitor Overview

Capacitor Inspection

Before beginning replacement, inspect all boards for signs of capacitor failure:

• Bulging Tops - Electrolytic capacitors have a scored vent on top; bulging indicates internal pressure from failure
• Leaking Electrolyte - Brown, black, or clear fluid around capacitor base indicates active leakage
• Corrosion or PCB Staining - Discoloration of the PCB near capacitors suggests electrolyte damage
• Crystalline Deposits - White or tan crystalline material indicates dried electrolyte

The Macintosh TV contains capacitors on three boards:

1. Logic Board (5 capacitors)
2. TV Tuner Board (12 capacitors)
3. Analog Board (various through-hole capacitors)

Macintosh TV Capacitor Lists

Logic Board Capacitors

Macintosh TV Logic Board

Logic Board Capacitor Specifications

Capacitance	Voltage	Quantity	Type	Notes
100uF	25V	1x	SMD Aluminum Electrolytic	Main filter capacitor
47uF	16V	2x	SMD Aluminum Electrolytic
10uF	16V	2x	SMD Aluminum Electrolytic

The logic board is similar to the Macintosh LC 550 but with modifications for the TV tuner interface.

TV Tuner Board Capacitors

Macintosh TV Tuner Board Capacitor Guide

Macintosh TV Tuner Board

TV Tuner Board Capacitor Specifications

Capacitance	Voltage	Quantity	Type	Notes
47uF	6.3V	1x	SMD Aluminum Electrolytic	Non-standard value
4.7uF	35V	4x	SMD Aluminum Electrolytic
4.7uF	25V	4x	SMD Aluminum Electrolytic
1uF	50V	1x	SMD Aluminum Electrolytic
0.47uF	50V	2x	SMD Aluminum Electrolytic	Non-standard value

Note: The TV tuner board uses non-standard capacitor values (particularly 6.3V and 0.47uF) that are uncommon in other Macintosh boards. These may require special ordering.

Analog Board Capacitors

The LC 500 series analog board contains numerous through-hole electrolytic capacitors. Complete specifications are not fully documented, but key capacitors include:

Analog Board Key Capacitors (Partial List)

Location	Capacitance	Voltage	Type	Notes
Main filter	1000uF-3300uF	16V-25V	Radial electrolytic	Low ESR recommended
Secondary filter	220uF-470uF	25V-35V	Radial electrolytic
Deflection circuit	47uF-100uF	100V-160V	Radial electrolytic	High voltage rating critical
B+ filter	100uF-220uF	200V-250V	Radial electrolytic	Safety rated

The analog board may not require immediate recapping unless symptoms are present. Focus on the logic board and TV tuner board first.

Capacitor Replacement Procedure

1. Discharge the CRT - Follow the CRT Discharge Procedure before opening the case. The CRT and analog board contain lethal voltages.

1. Remove the rear case - Use a long Torx T-15 screwdriver to remove the rear housing screws.

1. Disconnect cables - Carefully disconnect the video cable, speaker cables, power connector, and any other cables to the logic board.

1. Remove the logic board - The logic board slides out after removing mounting screws. Note the orientation of all connectors.

1. Remove the TV tuner board - The tuner board connects to the logic board via an edge connector. Carefully release it.

1. Desolder old capacitors - Use a temperature-controlled soldering iron (350C-380C) and desoldering braid or pump. For SMD capacitors, heat both pads alternately while gently lifting the capacitor.

1. Clean the pads - Remove old solder and any electrolyte residue with isopropyl alcohol (90%+) and a soft brush. Inspect traces for damage.

1. Install new capacitors - Observe correct polarity. The negative side is typically marked with a stripe on the capacitor. Match the silkscreen markings on the PCB.

1. Solder securely - Use quality leaded solder (60/40 or 63/37) and ensure good solder joints.

1. Trim leads and inspect - For through-hole capacitors, trim leads flush. Inspect all joints under magnification.

1. Clean the board - Remove flux residue with isopropyl alcohol.

1. Test for shorts - Use a multimeter to check for shorts between power rails before reassembly.

Recommended Tools

• Temperature-controlled soldering iron (Hakko, Weller, or equivalent)
• Fine soldering tip (chisel or conical, 1-2mm)
• Desoldering braid (2-3mm width)
• Desoldering pump/solder sucker
• Fine leaded solder (0.5-0.8mm diameter)
• Isopropyl alcohol (90% or higher)
• ESD-safe brush
• Multimeter
• Magnifying glass or loupe
• Safety glasses
• ESD wrist strap

Recommended Replacement Capacitors

For SMD aluminum electrolytics, quality brands include:

• Nichicon
• Panasonic (FR, FC, or FM series)
• Rubycon
• United Chemi-Con (KZE, KY series)

Avoid generic or low-quality capacitors. Match or exceed the original voltage rating. Slightly higher capacitance values (within 20%) are acceptable.

Voltage Adjustment After Recap

After recapping, verify power supply voltages:

• +5V rail: 4.85V - 5.15V
• +12V rail: 11.9V - 12.7V

Adjust potentiometers on the analog board if necessary. Allow the system to warm up for 15-30 minutes before final adjustment.

Additional Tips

• Work in a well-lit, static-free environment - Use an ESD mat and wrist strap
• Document before disassembly - Take photos of cable routing and connector positions
• Label capacitors - Note polarity and position before removal
• Test incrementally - Power on and test after completing each board before full reassembly
• Keep the old capacitors - Useful for reference if issues arise
• Practice first - If unfamiliar with SMD work, practice on a scrap board

Sourcing Capacitors

Reliable sources for quality capacitors:

• Mouser Electronics
• Digi-Key
• RS Components
• Console5 (pre-made kits for some Macintosh models)

For the TV tuner board's non-standard values, you may need to search specialty electronics suppliers or accept nearest-value substitutes where appropriate.

Related Maintenance Pages

• Macintosh TV Troubleshooting
• Macintosh TV General Maintenance
• Macintosh TV
• CRT Discharge Procedure