Acer Aspire 5930 5930G (Compal LA-4221P) Schematic & Boardview Download + Chip-Level Diagnostic Guide

The Acer Aspire 5930 and 5930G represent a landmark era in multimedia laptops, built upon the robust Intel Montevina (Centrino 2) platform. At its heart lies the Compal LA-4221P (ZQS) motherboard, a complex multi-layered PCB featuring a dedicated MXM-II graphics slot—a rarity that makes this model both highly capable and prone to specific thermal-related failures. For the chip-level engineer, this board is a classic example of late-2000s Compal engineering, utilizing the ICH9M Southbridge and the PM45 Northbridge architecture.

Board Architecture & Technical Specifications

Feature	Technical Detail
Motherboard Model / ODM Part Number	Compal LA-4221P (ZQS)
Target Laptop Series	Acer Aspire 5930 / 5930G Series
Chipset / CPU Architecture	Intel Core 2 Duo (Penryn/Merom) + PM45 + ICH9M
Super I/O (EC/KBC) Controller	ENE KB926QF D3
Key Voltage Rails & Switching Coils	PL4 (+3VALW), PL5 (+5VALW), PL6 (+1.8V_DDR2), PL10/PL11 (+VCC_CORE)

Real-World Motherboard Diagnostic Procedures

1) Input Power Stage & DC-IN Protection Circuit

The LA-4221P uses a standard Compal protection logic. Start by measuring the voltage at PR3 (current sense resistor). If 19V is missing here, inspect PQ1 and PQ2 (AO4407 P-Channel MOSFETs). These are controlled by the ISL6251 (PU1) charging IC. Check for ACIN (pin 23) which should be approximately 3.2V. If PACIN is low, the charging IC will not pull the gates of PQ1/PQ2 low, preventing the main rail +19VB from populating the board. Common failure: Shorted ceramic decoupling capacitors on the +19VB rail near the MXM slot.

2) The Infamous NEC/TOKIN Capacitor Failure

A signature fault of this generation (shared with Toshiba models) is the NEC/TOKIN OE128 (or similar) Proadlizer capacitor located directly under the CPU socket on the secondary side. This component filters +VCC_CORE. Over time, its ESR increases, leading to system instability, freezing under load, or the laptop only running on battery but crashing on AC power. To repair, remove the NEC/TOKIN and replace it with four 330uF Tantalum capacitors (low ESR) in parallel to restore rail stability and prevent ripple-induced shutdowns.

3) Power-On Sequence & Signal State Tracking

If the laptop has standby lights but won't trigger, verify the ENE KB926QF state. Ensure +3VALW is present at PL4. When the power button is pressed, the EC should release EC_ON to enable the secondary rails. Track MAINON and SYSON. If these signals are present but there is no display, focus on the MXM-II Graphics Card. The 5930G often suffers from GPU BGA lead-free solder fatigue. Before condemning the PCH or CPU, test with a known-good MXM card or check the +VGA_CORE rail on the dedicated graphics module itself.

Download Schematic & Boardview Files

📥 Download ASPIRE 5930-5930G Schematic / Boardview

Direct download link. Verified schematic / boardview archive for Compal LA-4221P.

Professional Repair Assistance

Explore our technician resources:

• 🛠️ Diagnose No-Power & Short-Circuit faults step-by-step: Interactive Laptop Diagnostic Lab
• 🛒 Original Replacement Motherboards & IC Components: Official Spare Parts Mega Store

Acer Aspire 6930 6930G 6930Z 6930ZG (Compal LA-4221P) Schematic & Boardview Download + Chip-Level Repair Guide

The Acer Aspire 6930 series, part of the iconic 'Gemstone Blue' era, remains a classic example of the Intel Centrino 2 (Cantiga) platform. Built on the Compal LA-4221P (KHLB0) motherboard, this machine utilizes a robust but complex power distribution system designed to handle the thermal demands of Core 2 Duo Penryn processors and dedicated MXM graphics cards. For chip-level technicians, the LA-4221P is a masterclass in discrete-to-UMA switching logic and legacy power management.

Board Architecture & Technical Specifications

Component	Specification
Motherboard Model / ODM	Compal LA-4221P (KHLB0/KHLB1)
Chipset Architecture	Intel PM45 / GM45 + ICH9-M Southbridge
Super I/O (EC) Controller	ENE KB926QF D3
Charging & System PWM	ISL6251 (Charging), ISL6237 (3V/5V Standby)
Key Voltage Rails	+3VALW (PL4), +5VALW (PL5), +1.5V_DDR2 (PL6), +VCC_CORE (PL10/PL11)

Real-World Motherboard Diagnostic Procedures

1. DC-IN Protection & ISL6251 Charging Logic

On the LA-4221P, the +19VB rail is governed by the ISL6251 (PU1). If the laptop is completely dead with no lights, first measure the voltage at PR1 (Current Sense Resistor). If 19V is missing here, check the gate voltage of the two P-Channel MOSFETs PQ1 and PQ2 (SI4407DY). The EC PACIN signal must reach approximately 3.3V to allow the charging IC to pull the gates low. If ACIN at Pin 2 of PU1 is below 2.4V, the system will not detect the adapter, often caused by a shifted resistor divider at PR11 and PR13.

2. Standby Rail Analysis & S5 State Failure

The 3.3V and 5V Always-On rails are generated by PU4 (ISL6237). Before pressing the power button, verify PL4 (+3VALW) and PL5 (+5VALW). A common failure point in this generation is the breakdown of the filter capacitors PC18 and PC23, leading to a 'chirping' sound from the coils. Ensure the EN_LDO (Pin 4) is present. If the rails are missing but LDO (Pin 7) is 3.3V, check if MAINPWON from the KB926QF EC is reaching PU4. Resistance to ground on PL4 should be >300 ohms; if lower, the Southbridge (ICH9-M) may be partially shorted.

3. VCC_CORE Stability & The NEC/TOKIN Factor

A frequent issue with the Aspire 6930G is the laptop shutting down under load or freezing when the AC adapter is plugged in. This is almost exclusively caused by the aging of the NEC/TOKIN OE128 (PC114) proadlizer capacitor located directly under the CPU socket on the VCC_CORE rail. When this component fails, it can no longer filter high-frequency ripple from PL10/PL11. The professional fix involves removing the NEC/TOKIN and replacing it with four 330uF 2.5V Tantalum capacitors in parallel to restore rail stability. Additionally, check IMVP_PWRGD to ensure the processor is signaling the EC that the core voltage is within tolerance.

Download Schematic & Boardview Files

📥 Download ASPIRE 6930,6930G,6930Z,6930ZG Schematic / Boardview

Direct download link. Verified Compal LA-4221P schematic archive for professional use.

Professional Repair Assistance

Explore our technician resources:

• 🛠️ Diagnose No-Power & Short-Circuit faults step-by-step: Interactive Laptop Diagnostic Lab
• 🛒 Original Replacement Motherboards & IC Components: Official Spare Parts Mega Store