Acer H81h3-am V1.0 Manual ●

Acer H81H3-AM V1.0 is a micro-ATX (mATX) motherboard typically found in Acer desktop systems like the Veriton X2631G

. It is manufactured by ECS (EliteGroup) and utilizes the Intel H81 Express chipset, designed to support Intel's 4th Generation "Haswell" processors. Acer Community Core Hardware Specifications Processor Support : Supports

socket CPUs, specifically Intel 4th Gen Core i3, i5, i7, Pentium, and Celeron series. Confirmed compatible CPUs

: i7-4790, i5-4570, i5-4440, i3-4130, Pentium G3220, and Celeron G1820. : Features 2 DIMM slots supporting up to of DDR3 SDRAM.

Architecture: Dual-channel, non-ECC, unbuffered DDR3 1600/1333/1066 MHz. Expansion Slots 1 x PCI Express x16 Gen 2.0 (for dedicated graphics). 1 x PCI Express x1 Gen 2.0. 2 x legacy PCI slots. 2 x SATA III (6Gb/s) connectors. 2 x SATA II (3Gb/s) connectors. Acer Community I/O and Internal Connectivity Acer H81H3- AM v1.0 supported processor list Acer H81h3-am V1.0 Manual

These processors are compatible with this motherboard: Intel Pentium G3220. Intel Celeron G1820. i3-4130. i5-4440. i5-4570. Acer Community Generic H81H3-AM V1.0 Motherboard User Manual

CMOS Clear Jumper (CLR_CMOS)

Located near the SATA ports or the bottom edge. By default, jumper bridges pins 1-2. To clear CMOS:

1. Turn off PC and unplug power.
2. Move jumper to pins 2-3 for 10 seconds.
3. Return to pins 1-2.
4. Power on.

Internal USB Headers

• USB 2.0 Header (9-pin): Supports 2 ports. Standard pinout (VCC, D-, D+, GND, NC). Located near the PCI slots.
• USB 3.0 Header (19-pin): Blue connector, located beside the 24-pin power.

7. Upgrading the Acer H81H3-AM V1.0 for 2024

Can this 10-year-old motherboard still be relevant? Absolutely. With the right upgrades, it makes a capable low-end gaming or home server system.

Front Panel Header (F_PANEL)

The front panel header is the most confusing part of this board. Acer uses a proprietary 14-pin block (though only 9-10 pins are active). Acer H81H3-AM V1

Pinout (from left to right, top row then bottom row):

| Pin | Signal | Pin | Signal | | --- | --- | --- | --- | | 1 | HDD LED+ | 2 | Power LED+ | | 3 | HDD LED- | 4 | Power LED- | | 5 | Reset Switch | 6 | Power Switch | | 7 | Ground | 8 | Ground | | 9 | NC (Not Connected) | 10 | Speaker |

Important: Standard cases may need pin modification. If your power button does not work, you may need to swap the power switch pins (positions 5 and 6 sometimes reversed).

3. Power-On Sequencing (Deep Dive)

Using a logic analyzer on the EC (ENE KB930QF, embedded controller), the sequence is: CMOS Clear Jumper (CLR_CMOS) Located near the SATA

1. +5VSB present from PSU to pin 9 of J12.
2. EC_VCC (3.3V from 5VSB via U34, an APL5912) stabilizes.
3. RSMRST# (Resume Well Reset) goes high after 50ms.
4. PWRBTN# pulled low → EC latches PS_ON# low (pin 10 of J12).
5. PSU responds with PWR_OK (pin 12 of J12) – note: Acer uses pin 12, whereas ATX uses pin 8.
6. EC asserts VR_EN to the RT8859A PWM controller (Vcore).
7. After Vcore OK, EC deasserts PLT_RST# to PCH.

Failure point: If a standard PSU is used without converting PWR_OK to pin 12, the EC never releases the system from reset. The fans will spin, but no POST.

Manual Specifics and Components

The manual for the Acer H81H3-AM V1.0 typically includes detailed instructions on:

1. Unpacking and Inspection: Carefully unpack the motherboard and inspect it for damage.
2. Components Identification: A detailed list and description of all components, including capacitors, resistors, and the layout of the motherboard.
3. Installation Steps:
   • Installing the CPU and CPU cooler.
   • Adding memory (DIMMs).
   • Connecting power cables, fans, and front panel headers.
   • Installing expansion cards.
4. Connectors and Jumpers: Details about the function and location of various connectors (like SATA, USB, audio), jumpers (for configurations like resetting BIOS), and headers (for system fans, front panel).
5. BIOS Setup: Instructions on entering and navigating the BIOS setup utility, and making basic settings.

3. Jumper & CMOS Reset Guide (Common for H81H3-AM)

If you cannot find the service guide, here are typical locations:

• Clear CMOS jumper (CLR_CMOS): Usually near the CMOS battery (CR2032) or SATA ports. Labeled CLR_CMOS, JBAT1, or CMOS1.

  • Procedure: Power off → short jumper pins for 5–10 seconds → remove short → reboot.
  • Alternative: Remove battery for 5 minutes.

• BIOS recovery / password reset: No standard jumper; use CMOS clear method.

Many Acer OEM boards lack printed pin labels. Look for tiny silkscreen text near edges.

1. Specifications Overview

• Model Name: H81H3-AM
• Version: V1.0
• Form Factor: Micro-ATX (approximately 244 mm x 244 mm, though Acer boards often have slightly custom layouts/mounting holes).
• Chipset: Intel H81 Express (Lynx Point).