Shuts down after 5 minutes

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Xbox 初代モデル

初代Xboxは、Microsoftで初めて広く普及したビデオゲームコンソールです。上面と前面に「XBOX」の文字が入った黒いケースで、簡単に識別できます。修理は一般的な工具で簡単にできます。

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Jason Kelly @jasonkelly59467

評価: 1

投稿日: 2026年1月19日

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Shuts down after 5 minutes

Original Xbox 1.6 – Persistent ~5-minute shutdown on two separate motherboards

Symptoms:

Boots normally, fan spins, runs for ~4–5 minutes then hard shutdown (power cuts off completely).

Fast alternating orange/green flashing LED the whole time.

Same exact behavior on two different version 1.6 motherboards (Tuscany).

No HDD or DVD drive connected (minimal PSU + board only test).

Troubleshooting already done:

Replaced thermal paste on CPU & GPU (old stuff was cracked/shrunken). No change.

Fan confirmed working normally.

Swapped power supplies (tested with known-good PSU). Same shutdown.

Measured resistance on 12V yellow wire to ground: 0.557 MΩ (no short).

Observed 12V rail drops to ~5V right at shutdown.

Clock capacitor not bulging; no visible leakage/corrosion near it or Xyclops.

No bulging/leaking on any electrolytic caps (including five 3300µF ones near power/CPU/GPU).

Not using original AV cable (none plugged in during tests) → explains orange/green flashing ("no AV pack detected"), but shutdown persists.

Tested with no peripherals; same result on both boards.

Conclusion so far:

Not PSU, not thermal paste/heatsink, not obvious cap failure, not HDD/DVD, not simple short. Seems like false overheating protection (integrated temp sensing in Xyclops chip) Xyclops/temp diode path

Traces look good

Ive also confirmed from what I can see traces are good

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Augustine @salmonjapan 評価: 17.3千 11 17 19 · Answer 1 · 2026-01-19T21:02:55-07:00

⚠️ Known Weaknesses of Xbox v1.6 Boards

• Xyclops chip (video encoder + system management)

• Integrates temperature sensing and shutdown logic.

• False triggers are known if the temp diode path is degraded.

• Capacitors

• Even if not visibly bulging, the five 3300µF caps near CPU/GPU and the smaller ones in the power regulation path can dry out internally.

• Aged caps can cause voltage sag under load → explains your 12V rail dropping to ~5V at shutdown.

• Trace corrosion

• Clock capacitor leakage is infamous on earlier revisions, but even if yours looks clean, micro‑corrosion under solder mask can affect sensor lines.

🛠️ Next Diagnostic Steps

1. Check voltage regulators

• Measure 5V and 3.3V rails during operation. If they sag before shutdown, suspect caps or regulators.

2. Replace suspect capacitors

• ESR meter test is best, but given age, replacing the 3300µF caps and smaller filter caps is often necessary even if they look fine.

3. Inspect Xyclops temp diode path

• Look for hairline cracks or corroded vias around the Xyclops chip.

• Reflow solder joints if needed.

Xbox 初代モデル

Shuts down after 5 minutes

Update (01/19/26)

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