Board turns on, fans spin continuously at high speed, but there is no POST beep, no USB peripheral initialization, and no display output.
: Micro-ATX (uATX), fitting into most standard mid-tower and slim-line cases.
While a full "paper" on its internal schematics is typically proprietary to the manufacturer (Eton/HP), the following technical profile serves as a comprehensive reference for its design and architecture. 1. Core System Architecture Form Factor: micro-ATX (
With more context, I can offer more targeted assistance. hig41uatx rev 11 schematic
If you are currently diagnosing a hardware issue on this board, share (e.g., specific beep codes, component overheating, no power) or which voltage rail you are tracking , and I can provide targeted circuit tracing guidance. Share public link
The motherboard, commonly known by its HP/Compaq codename "Eton" , is a vintage Micro-ATX board manufactured by Foxconn . Frequently found in office-oriented desktops like the HP Compaq 500B series , it remains a popular choice for budget-conscious retro builders and repair technicians.
Pressing the power button sends a low pulse to the Super I/O, which relays it to the Southbridge via SLP_S3# . Board turns on, fans spin continuously at high
When measuring test points on the board, keep this voltage matrix from the schematic handy:
Understanding the physical layout and chipset routing is the first step in decoding the HIG41UATX Rev 11 schematic. The board uses a standard Micro-ATX (uATX) form factor, though custom OEM mounting holes may be present.
The HIG41UATX Rev 1.1 is built around the Intel G41 Express chipset , which provides a stable platform for 45nm and 65nm Intel processors. Specification LGA 775 (Socket T) Chipset Intel G41 Express (Northbridge) / ICH7 (Southbridge) Memory 2x DDR3 DIMM slots, Dual Channel, up to 4GB (Officially) Graphics Integrated Intel Graphics Media Accelerator (GMA) x4500 Expansion 1x PCIe x16, 2x PCIe x1, 1x PCI, 1x Mini PCIe (for WiFi) Storage 4x SATA 3Gb/s ports Processor Compatibility Share public link The motherboard, commonly known by
This behavior is typically caused by breakdown anomalies across the
Locate the filtering capacitor bank aligned around the CPU socket input/output rails. Look for physical bulging or test their Equivalent Series Resistance (ESR). Replace degraded capacitors with high-quality, low-ESR equivalents of the exact capacitance and voltage ratings indicated on the circuit diagram. Corrupted SPI Flash ROM (BIOS)
Understanding the HIG41UATX Rev 11 Schematic: A Comprehensive Guide to the HP Socket 775 Motherboard The H-IG41-uATX (Rev 1.1) Go to product viewer dialog for this item.
The CPU circuit implements a multi-phase buck converter array composed of low-ESR solid-electrolyte capacitors, ferrite core chokes, and discrete MOSFET high/low-side switches. It steps down 12V inputs into a dynamically shifting Vcore voltage (typically varying between based on CPU loads).