The , often referred to as the Eton motherboard, is a micro-ATX board manufactured by Foxconn for HP and Compaq desktop systems. While a complete public "schematic" (component-level circuit diagram) is rare, its technical architecture and repair profile are well-documented by the enthusiast and repair communities. Core Architecture & Specifications
: LGA 775, supporting Intel Core 2 Quad, Core 2 Duo, Pentium Dual-Core, and Celeron processors.
| Symptom | Check in Schematic | Common Culprit | |---------|-------------------|-----------------| | No power (LEDs off) | +5VSB rail → I/O controller Vcc | Shorted ceramic cap on +3.3VSB | | Fans spin, no POST | PWRGD_ICH (pin 32 of ICH7) | Missing 1.05V PCH PLL voltage | | Random resets | CPU Vcore ripple → PWM controller’s COMP pin | Bad electrolytic cap on Vcore output | | No sound but audio driver installs | ALC662’s AVDD (pin 4) | 3.3V_AUDIO missing due to blown inductor | | USB ports dead | +5V_USB from APL3511A power switch | Enable pin (EN) floating due to solder crack | hig41uatx rev 11 schematic
H-IG41-uATX (Rev 1.1) is an HP/Compaq motherboard manufactured by Foxconn (often referred to by the internal name
A central integrated circuit (IC) sends switching signals to the MOSFETs. The , often referred to as the Eton
Some user-modified BIOS files include updated microcodes, enabling better support for 45nm CPUs (such as the E0 stepping). 5. Summary of Key Connectors
Users on community forums like the HP Support Community frequently report boot-block issues, which can sometimes be recovered using the AMIBOOT.ROM method via a USB drive. Schematic & Repair Insights For those looking for actual circuit paths: | Symptom | Check in Schematic | Common
When you obtain the schematic, verify its authenticity by checking a unique component on page 3: Resistor (10Ω, 0402) near the G41 chip – Rev 10 uses 22Ω, Rev 11 specifically uses 10Ω. If your schematic shows 22Ω, you have the wrong revision.
Supplies 3.3V, 5V, and 12V to the board.
You can check the voltage entering the ATX 24-pin connector and trace the standby power lines.
2x DDR3 DIMM Slots (Supports up to 4GB, sometimes 8GB with specific modules) Graphics: Integrated Intel GMA X4500 (VGA output)