14 pin Molex 39-01-2140 connector at the motherboard.
The Acer Aspire iDEA 500/510 desktop uses a proprietary 14-pin power connector (component No. 19 on the system board) rather than a standard ATX 20-pin or 24-pin supply. The connector housing is a Molex 39-01-2140 — the same Mini-Fit Jr family used in ATX supplies — but the pin count and signal assignments differ from the ATX specification, making a standard ATX power supply physically incompatible. The original power supply unit is the Fortron FSP120-40GLS (120 W, Acer part number PY.12008.002), rated at +3.3 V/10 A, +5 V/8 A, +12 V/10 A, and +5 Vsb/2 A with a combined +3.3 V and +5 V maximum of 50 W. This proprietary connector was introduced in the late 1990s to early 2000s, during the Pentium II/III era, when several OEM manufacturers deviated from the Intel ATX Power Supply Design Guide.
| Pin | Name | Description |
|---|---|---|
| 1 | +3.3V | orange |
| 2 | COM | black |
| 3 | O/T signal (over temperature) | blue |
| 4 | PS ON | green |
| 5 | PW OK | grey |
| 6 | COM | black |
| 7 | +12V1 | yellow |
| 8 | +3.3V & +3.3VS | orange/brown |
| 9 | COM | black |
| 10 | +5Vsb | purple |
| 11 | +5V | red |
| 12 | +5V | red |
| 13 | COM | black |
| 14 | +12V1 | yellow |
Notes
- The connector housing is a Molex 39-01-2140 (14-position Mini-Fit Jr), the same housing family as the ATX 20-pin and 24-pin connectors, but with only 14 positions. This makes it physically incompatible with standard ATX power supplies — only the purpose-built FSP120-40GLS or a suitably modified replacement may be used.
- Connecting a standard ATX power supply to this board will result in incorrect voltages on signal pins and will immediately damage both the motherboard and the power supply.
- The original PSU is the Fortron FSP120-40GLS (Acer part number PY.12008.002), rated 120 W. Output ratings: +3.3 V/10 A, +5 V/8 A, +12 V/10 A, +5 Vsb/2 A; combined +3.3 V and +5 V load must not exceed 50 W.
Signals
- +3.3V — 3.3 V supply rail (orange wires; distributed across pins 1 and 8).
- +3.3VS — 3.3 V sense/auxiliary line paired with the main +3.3 V rail at pin 8 (orange/brown wire).
- COM — Common ground return (black wires; pins 2, 6, 9, 13).
- O/T signal — Over-temperature protection signal from the PSU thermal sensor; signals the system board when the PSU has exceeded a safe operating temperature (blue wire, pin 3).
- PS ON — Power-supply enable signal (green wire, pin 4); pulling this line low commands the PSU to switch on; functionally equivalent to the ATX PS_ON# signal.
- PW OK — Power-good signal (grey wire, pin 5); asserted by the PSU once all output voltages are within specification, indicating to the system board that it is safe to release the processor reset.
- +12V1 — 12 V supply rail (yellow wires; distributed across pins 7 and 14).
- +5Vsb — 5 V standby supply, present whenever mains power is applied regardless of the PS ON state; powers the soft-power circuitry (purple wire, pin 10).
- +5V — 5 V supply rail (red wires; pins 11 and 12).