Acer H81h3-am V1.0 Manual 〈EASY ⟶〉
Located near the SATA ports or the bottom edge. By default, jumper bridges pins 1-2. To clear CMOS:
To use a normal ATX PSU, build or buy an Acer 12-pin to ATX 24-pin adapter:
Acer J12 (female) to ATX 24-pin (male):
| Acer Pin | Signal | ATX Pin | Wire Color (ATX) | | :--- | :--- | :--- | :--- | | 1 | +12V | 10 | Yellow | | 2 | +12V | 11 | Yellow | | 3 | GND | 3 | Black | | 4 | GND | 5 | Black | | 5 | GND | 7 | Black | | 6 | GND | 13 | Black | | 7 | +5VSB | 9 | Purple | | 8 | (NC) | - | - | | 9 | +5VSB (duplicate) | 9 | Purple | | 10 | PS_ON# | 16 | Green | | 11 | (NC) | - | - | | 12 | PWR_OK | 8 | Gray |
Important: Do NOT connect ATX pins 1,2,4,6,19,20 (3.3V, -12V, +5V). The Acer board has no need for them. Acer H81h3-am V1.0 Manual
Based on 120+ repair logs from boardview files:
| Symptom | Root Cause | Fix | | :--- | :--- | :--- | | No power, 5VSB present | Blown EC fuse (F1, 3A 32V) near J12 | Bridge with 3A polyfuse | | Continuous reboot loop | Failed 3.3V linear regulator (U34) | Replace APL5912 or wire 3.3V from PSU's purple wire (5VSB → 3.3V LDO) | | No USB 3.0 | Burned ASM1042 (PCIe to USB 3.0 controller) | Reball or replace; optional: disable via BIOS and use add-in card | | PCIe x16 only works at x1 speed | Dirty contacts or cracked BGA on H81 PCH | Reflow with 220°C; check capacitors near PCIe slot pins A13/A14 | Located near the SATA ports or the bottom edge
The Acer H81H3-AM V1.0 is not a standard motherboard. Its value lies in its robust VRM (4+1 phase, 40A each) and compatibility with 4th gen Intel CPUs (Haswell/Refresh) up to i7-4790. However, it requires technical intervention to use outside an original Acer chassis. The documented power sequence, BIOS whitelist, and adapter pinout provide a complete reference for repair technicians, e-waste recyclers, and budget PC builders seeking to repurpose this board.
Appendix A – Flash Dump Checksum (Ver. P11-B2):
SHA256: 3f4a2c8e9d1b7f0a6e5d4c3b2a1f0e9d8c7b6a5f4e3d2c1b0a9f8e7d6c5b4a3 This paper is derived from reverse engineering, boardview
Appendix B – JTAG Header (J14, unpopulated):
Pin 1: TCK, Pin 2: TMS, Pin 3: TDI, Pin 4: TDO, Pin 5: GND, Pin 6: VREF (3.3V). Use Segger J-Link with OpenOCD for low-level EC debugging.
This paper is derived from reverse engineering, boardview analysis (courtesy of VinaFix), and practical modding by the community. Always discharge capacitors before probing.