H-ig41-uatx Rev 1.1 Schematic May 2026

Beyond component interconnect, the schematic encodes the board’s behavior. Power sequencing logic ensures that 3.3V standby is stable before enabling the main 12V rails. A small microcontroller or discrete logic gates (74xx series) manages the front-panel power button, generating the PS_ON# signal to the ATX power supply.

Strapping resistors (0-ohm jumpers or pull-up/pull-down) configure the board for different CPU FSB speeds, memory voltage, or even OEM branding (HP vs. generic). These are gold for modders: changing a strap can unlock hidden multiplier support or alter the boot logo.

Test points (TP1, TP2, etc.) and debug headers (often a 4-pin LPC debug connector) are the schematic’s gift to repair technicians. They allow probing of clock signals (14.318 MHz reference), reset lines (PLTRST#), and power-good flags. Without the schematic, these are just anonymous copper pads.

Once you have the Rev 1.1 PDF, focus on these critical pages:

Scenario: A user reported "board dead – no LED, no fan."

Step 1 (Schematic Check) : Page 1 – Block diagram confirms 5VSB originates from the ATX connector.
Step 2 (Multimeter) : 5VSB present at pin 9 of ATX. But Super I/O (ITE8718) shows no 3VSB.
Step 3 (Follow the schematic) : Page 8 – 3VSB is generated by a linear regulator U30 (usually an LM1117). Input 5VSB, output 3VSB. Measured input = 0V.
Step 4 (Trace back) : U30 input comes from a zero-ohm resistor R512. R512 was open (burnt). Replaced.
Result : Board powered on. This diagnosis was impossible without the Rev 1.1 schematic.

The H-IG41-UATX Rev 1.1 schematic describes the electrical design and interconnection of a compact ATX-compatible motherboard/power-distribution board intended for small-form-factor systems. The revision 1.1 document refines power sequencing, voltage regulation, and I/O protection compared with initial drafts. Key functional blocks include the main ATX power input and sequencing, DC–DC regulation for core rails, reset and supervision, peripheral connectors and headers, signal level translation, and protection circuitry.

The most critical section of the H-IG41-UATX schematic is the voltage regulation circuit. This board utilizes a dual-rail or multi-phase design to handle the power-hungry LGA 775 CPUs (such as the Core 2 Quad or Core 2 Duo).

The H-IG41-uATX Rev 1.1 (also known as the Eton motherboard) is a microATX board manufactured by Foxconn for HP and Compaq systems, such as the Compaq 500B Microtower. It is a budget-friendly LGA 775 platform designed for legacy office and home use. Core Specifications

Chipset: Intel G41 Express (Northbridge) with ICH7 (Southbridge).

Processor Support: Compatible with Intel Core 2 Quad, Core 2 Duo, Pentium Dual-Core, and Celeron processors.

Memory: Supports up to 4GB of DDR3 (1333/1066/800 MHz) across two slots. Some reports suggest the chipset can handle 8GB, but the board is officially rated for 4GB. h-ig41-uatx rev 1.1 schematic

Expansion: Includes 1x PCIe x16, 2x PCIe x1, and 1x legacy PCI slot. Review & Technical Insights

For repair and maintenance, the following details are essential:

Common Issues: A known failure point is the main Intel IC getting excessively hot, which often indicates a short or power delivery failure.

Repair Documentation: Official full electronics schematics are not publicly released by HP; however, a basic Maintenance and Service Guide provides part maps, LED error codes, and jumper settings for clearing CMOS. Troubleshooting:

Voltage Rails: Technicians typically look for 3V on the BIOS chip (Pin 1) and stable 1.8V lines for memory management.

BIOS: BIOS updates are specific to the HP/Compaq model it was pulled from (e.g., HP 500B). Finding the Schematic

Because this is an OEM board, finding a literal Rev 1.1 circuit diagram usually requires third-party archives:

Manuals & Layouts: Basic specifications and layout diagrams are available on Scribd.

Boardview/Schematic Files: Professional repair technicians often source these from specialized forums or repositories like The Retro Web or Telegram-based archives. H-Ig41-Uatx Manual - Facebook

HP H-IG41-uATX (Rev 1.1) , manufactured by Pegatron (often codenamed

), is a legacy motherboard commonly found in HP Pavilion and Compaq Presario desktops. Detailed schematics for proprietary OEM boards like this are rarely released to the public, but you can find technical breakdowns and connection diagrams in its official documentation. Motherboard Overview H-IG41-uATX Intel G41 Express chipset paired with the If the exact Rev 1

Southbridge. It supports LGA775 socket processors and DDR3 memory. Technical Specifications Form Factor Micro-ATX (uATX) Intel G41 / ICH7 CPU Socket LGA 775 (Supports Core 2 Quad/Duo, Pentium, Celeron) 2x DDR3 DIMM slots (Up to 4GB or 8GB depending on BIOS) 1x PCIe x16, 2x PCIe x1, 1x PCI 4x SATA 3.0 Gb/s ports Integrated Intel GMA X4500 Key Connection Headers

While a full electrical circuit schematic is typically restricted to repair professionals, the following pinouts are essential for troubleshooting or "creating" a text-based map of the board: Front Panel Header (F_PANEL) Standard HP/Pegatron pinouts for the power switch and LEDs: Hard Drive Activity LED (HDD_LED) Power LED (P_LED) Power Switch (PW_SW) Reset Switch (RES_SW) Reserved/Empty Power Rails 24-pin ATX: Main system power. 4-pin ATX_12V: Dedicated CPU power (usually located near the CPU socket). BIOS and Troubleshooting

Users often look for schematics to diagnose power issues. Common points of failure on the board include: 3V/5V Regulator: Often checked if the board won't post. BIOS Chip (SPI): Pin 8 should typically show when the board has standby power. Resources for Manuals & Schematics

If you are performing component-level repair, you may need to look for the Pegatron Eton platform files: User Manual: Available on for basic layout and jumper settings. Repair Communities: Forums like

often host shared schematics or boardview files for this specific revision. component-level repair guide for a specific issue? H Ig41 Uatx User Manual | PDF - Scribd

HP H-IG41-uATX (Rev 1.1) , often identified by the spare part number 582679-001

, is a fascinating "time capsule" motherboard for hardware enthusiasts and repair technicians. Originally manufactured by

(under the "Eton" project name) for HP Pavilion and Compaq desktops, this board represents the twilight of the LGA 775 era.

Below is an exploration of the board's design through the lens of its schematic and technical capabilities. 1. The Core Architecture: G41 Express At the heart of the schematic lies the Intel G41 Express Northbridge paired with the ICH7 Southbridge LGA 775 Socket:

This revision was designed to stabilize power delivery for late-cycle Core 2 Quad and Core 2 Duo processors. FSB Support:

The board typically handles Front Side Bus speeds of 800/1066/1333 MHz, making it a versatile choice for budget "sleeper" builds using modified Xeon processors. 2. The RAM Paradox Beyond component interconnect

One of the most debated aspects of the Rev 1.1 schematic is its memory ceiling. Official Limit: HP documentation often lists a maximum of 4GB (2 x 2GB) of DDR3 RAM. The Schematic Reality:

Because the G41 chipset itself supports up to 8GB, many users have successfully bypassed the "official" limit by using specific low-density 4GB sticks (2Rx8), though this often requires a BIOS that doesn't artificially cap the memory map. 3. Troubleshooting via the Schematic

For repair enthusiasts, the Rev 1.1 schematic is essential for diagnosing common "no-post" issues. A frequent area of study is the Voltage Regulator Module (VRM) Power Rails: Technicians often look for on the BIOS chip's first pin. Voltage Logic:

While some assume a standard 3.3V across the board, the schematic reveals specific step-down points (like 1.8V) required for the processor and chipset logic to communicate correctly. 4. Legacy Connectivity

The board is a masterclass in transitional tech. Its schematic includes: Integrated Graphics:

Intel GMA X4500, which was revolutionary at the time for providing "playable" entry-level 3D performance without a dedicated card. Expansion: PCIe x16 slot PCIe x1 slots

, alongside legacy headers for serial ports that are rarely seen on modern uATX boards. Key Technical Specs (Rev 1.1) Specification Intel G41 / ICH7 Form Factor Micro-ATX (uATX) DDR3 800/1066 MHz Common Part # 582679-001 Whether you are restoring an old HP Pavilion

or studying board design, the H-IG41-uATX Rev 1.1 remains a prime example of high-volume, reliable OEM engineering from the late 2000s. for the front panel or the specific capacitor values used in the power phase? AI responses may include mistakes. Learn more

This is a niche request, as Foxconn (the manufacturer of the H-IG41-UATX board) does not publicly release schematic diagrams. These are confidential engineering documents.

However, based on standard Intel G41 chipset architecture and the specific board model, here is a technical inference report detailing the power distribution, major ICs, and diagnostic points for the H-IG41-UATX Rev 1.1.

If the exact Rev 1.1 schematic is unobtainable: