Nintendo GameCube Maintenance Guide

GameCube opened: disc drive in its shield (left), mainboard under the heatsink (centre), controller port board (right). Photo: Ray Dehler, CC BY 2.0, via Wikimedia Commons.

The two Nintendo GameCube models, DOL-001 and DOL-101, share the same maintenance points: cleaning, the external adapter and internal rails, the optical drive, cooling, the ports and the clock battery. Nintendo did not support board-level repair of the GameCube: its service centres exchanged faulty consoles whole. The figures here come from Nintendo's published specification, the community reference YAGCD, Console5, GC-Forever and iFixit, each cited where it is used.

Identify your console

DOL-001 and DOL-101 compared

Feature	DOL-001	DOL-101
Digital AV out	Yes	No
Serial Port 2	Early units only	No
Mainboards	NTSC DOL-CPU-01 to -30; PAL DOL-CPU(P)-01 and (P)-10	NTSC DOL-CPU-50 and -60; PAL DOL-CPU(P)-20
Mainboard electrolytics	5 to 8	3 (NTSC) or 1 (PAL)
Laser potentiometer, factory setting	450–600 Ω	150–250 Ω

Sources: board-to-model mapping and ports from GC-Forever; capacitor counts from Console5; potentiometer settings from GC-Forever.

YAGCD describes the retail hardware as HW2 in three editions: the first with every port, a second edition without Serial Port 2 (the plastic cover stays on the underside, with a metal plate behind it and no connector), and a third without Serial Port 2 or the digital AV connector. A DOL-001 without Serial Port 2 is a later unit, not a damaged one.

Power

The GameCube runs from an external adapter giving 12 V DC; the North American DOL-002 is rated 12 V 3.25 A. A DC-DC converter board inside the console makes the lower rails.

Check the adapter first

• Inspect it for swelling, cracks, a frayed cable or heat discolouration.
• Measure the output at the plug: about 12 V DC.
• Watch the meter while flexing the cable at both ends; a break at a strain relief gives an intermittent supply.

Internal rails

The DC-DC converter feeds the mainboard through connector P1. YAGCD gives the pinout and the nominal rails; it gives no tolerance or ripple figures, and nor does Nintendo.

Power supply connector P1

Pin(s)	Rail
1, 2, 5–8, 16–18	Ground
3, 4	3.3 V
9–12	1.8 V
13–15	1.55 V
19	Thermo detect
20	12 V
21, 22	5 V

Compare each rail with its nominal value, and with a working console if you have one.

Converter board variants

Several makers supplied the converter board, and only some used aluminium electrolytics:

• Mitsumi LSJB1091-1 (GCMK-MIX / GMKY-MIX): four 1000 µF 6.3 V electrolytics (three on one variant, where C5 is replaced by coil L5).
• Sharp DUQ1230A: hybrid polymer parts, plus one 1000 µF 6.3 V electrolytic at C57.
• TDK 1.0, 1.1, 2.0 and 2.1: polymer only.
• Mitsumi boards with no revision marking: tantalum, or a single polymer part.

Values are in the Nintendo GameCube Capacitor Replacement Guide.

Optical drive

The drive reads 8 cm discs of about 1.5 GB, "based on Matsushita's optical disc technology", at 16 to 25 Mbps in constant angular velocity. YAGCD gives the disc capacity as 1,459,978,240 bytes, or 712,880 DVD sectors, and the drive controller as a Matsushita MN103S13BGA.

Disc read errors

GC-Forever attributes disc read errors to the laser losing focus, from a dirty or scratched disc, a dirty lens or a failing laser. Work in this order:

1. Check the disc. Use a clean, unscratched original. If it looks clean but still fails, compare its thickness with another disc: one that has been resurfaced by a rental shop can be too thin.
2. Clean the lens with a cotton bud and isopropyl alcohol. Do not touch the lens with your fingers.
3. Adjust the laser potentiometer (below).
4. Replace the laser.

Look over the drive board's ten electrolytic capacitors while it is out; their values are in the capacitor guide.

Laser potentiometer

The drive board has a potentiometer that sets the laser's operating point. GC-Forever gives the factory settings as 450–600 Ω on the DOL-001 and 150–250 Ω on the DOL-101. A fixed 150 Ω resistor sits in the same path, so the lowest value the laser can see is 150 Ω. Lowering the resistance is the only adjustment that improves reading, and no particular value suits a particular kind of disc. For a new laser, start at 450 Ω.

1. Measure the potentiometer and write down the starting value.
2. Turn it a few degrees and measure again, to find which way lowers the resistance.
3. Lower it in small steps, testing a disc after each.

Cooling

A single fan sits over the heatsink. YAGCD's pinout of P1 includes a "Thermo detect" line on pin 19, but does not say what uses it. Clean the fan blades and heatsink fins with compressed air and a soft brush, and replace a noisy or seized fan.

Thermal pads

The heatsink is held by six screws and sits on thermal pads, not paste. On GC-Forever's forum, members advise replacing the pads with pads of the right thickness, never paste, and suggest 1.5 mm; they also say the original pads are fine to reuse. Measure the gap on your own board before buying.

If the heatsink is stuck, warm the pads with a hair dryer and twist it gently by hand. Lift old pad material off the chips with a plastic spudger, not a metal tool.

Clock battery

The real-time clock is kept running by a tabbed CR2032 cell soldered to the controller port board. When the clock and system settings reset each time the console is switched off, the cell is flat.

1. Remove the top case (see Opening the console).
2. Release the two clips on the grey controller port cover; the cover and the port board come out together. The clips are often brittle.
3. Remove the two Phillips screws holding the board to the cover and unplug its ribbon cable from the mainboard.
4. Desolder the old cell and fit a new tabbed CR2032 the same way round.
5. When refitting the top case, take care not to break the lid sensor switch; it is easier with the disc lid open.

The boards predate lead-free solder. See Battery Refurbishment for cell handling.

Connectors and ports

Controller ports

Each port is a seven-pin connector. Nintendo published no pinout; this is AllPinouts' community mapping:

Controller port

Pin	Wire colour	Function
1	Yellow	5 V, for the rumble motor only
2	Red	Data, bidirectional, pulled up to 3.43 V
3	Green	Ground
4	White	Ground
5	–	Not connected in known implementations
6	Blue	3.43 V logic supply
7	Black	Cable shield, usually common with pin 3

A data bit lasts 4 µs: a 0 is 3 µs low then 1 µs high, a 1 is 1 µs low then 3 µs high. The 3.43 V logic supply was measured on PAL hardware; 3.3 V is the nominal figure, and the difference is not a fault.

The ports are on the separate controller port board, joined to the mainboard by a ribbon cable. If one port is dead, check its solder joints and the ribbon before anything else.

Other connectors

Other connectors

Connector	Notes
Memory card slots (P4, P5)	Twelve contacts: 3.3 V, 5 V, serial data and clock, chip select, interrupt and ground
Analogue AV out (P7)	All models
Digital AV out (P2)	DOL-001 only
Serial Port 1 (P6)	Underside; Broadband Adapter and Modem Adapter
Serial Port 2	Early DOL-001 only; no accessory used it
High-speed parallel port (P10)	Underside, 36 pins; used by the Game Boy Player

Clean contacts with contact cleaner or isopropyl alcohol on a lint-free swab and let them dry.

The major ICs

Main chips (positions from YAGCD)

Position	Chip	Function	Clock
U1	Flipper, ArtX design, NEC embedded-DRAM process	Graphics, system controller, sound DSP; about 2 MB frame buffer and 1 MB texture cache	162 MHz
U2	Gekko, IBM, enhanced PowerPC 750	CPU	485 MHz (Nintendo); 486 MHz (console OS)
U3, U4	MoSys MS3M23B-5, 12 MB each	Main memory, 24 MB	64-bit bus to Flipper at about 324 MHz
U5	NEC 16 MB DRAM	Audio RAM (A-memory)	8-bit bus at 81 MHz
U6	A/V encoder (AVE-N-DOL)	Video encoder
U8, U9	Macronix	Clock generators
U10	Macronix	Real-time clock and boot ROM (IPL), serial interface, 14 pins

Sources: YAGCD for the positions, part numbers, buses and the 486 MHz OS figure (0x800000FC holds 486,000,000, against a 162,000,000 bus clock at 0x800000F8); Nintendo's specification for the 485 MHz and 162 MHz figures and the embedded memories. Nintendo names no maker for the 16-bit sound DSP. YAGCD lists it, with a question mark, as a Macronix DSP core inside Flipper.

Cleaning

Outside

• Damp microfibre cloth with mild detergent on the case; isopropyl alcohol on a soft cloth for marks.
• For yellowed plastic see Retrobrite.

Ports and slots

• Switch off and unplug first.
• Blow out the controller ports and memory card slots with compressed air, then clean with isopropyl alcohol on a lint-free swab.
• Look for bent or corroded pins.

Disc drive

• Blow dust out of the drive area and check the spindle turns freely.
• Clean the lens as above, without touching it.

Opening the console

Steps from iFixit's teardown:

1. Turn the console upside down and remove the four 4.5 mm Gamebit screws from the deep holes in the corners.
2. Turn it the right way up before lifting off the top case, to protect the laser.
3. Unclip the controller port cover and the rear I/O cover, and remove the earth straps over the memory card slots.
4. Remove the fan assembly, then the twelve Phillips #2 screws round the edge.
5. Lift out the drive assembly to reach the mainboard.
6. The internal power supply is under an EMI plate beneath the mainboard, held by two screws.

Clean the board, fan and heatsink with compressed air and a soft brush. Use isopropyl alcohol on residue and let it dry before reassembly.

Tools

• 4.5 mm Gamebit driver
• Phillips #1 and #2 drivers
• Digital multimeter
• ESD wrist strap and mat
• Isopropyl alcohol, lint-free swabs, cotton buds, compressed air
• Plastic spudger
• Thermal pads (measure the gap first)
• Soldering iron, desoldering braid and hot air for capacitor work; a tabbed CR2032 for the clock

See Recommended Tools.

Maintenance checklist

1. Check the adapter's output before connecting it to a console that has been stored.
2. Clean the controller ports and memory card contacts.
3. Blow dust out of the vents, fan and heatsink.
4. With the console open, look for leaked electrolyte on the drive board, the DC-DC converter and the mainboard.
5. Replace the clock battery if the clock no longer keeps time.

Related pages

• Nintendo GameCube
• Nintendo GameCube Capacitor Replacement Guide
• Nintendo GameCube Troubleshooting Guide
• Yet Another GameCube Documentation (YAGCD)
• Capacitor Failure Symptoms