Locate the 3.3V/5V buck controller on the schematic to verify if the linear regulators ( VREG3 / VREG5 ) are running.
A deep dive into the reveals a logical, multi-page structure. Technicians map these blocks to isolate physical components on the PCB boardview. 1. Charger and Main DC-In Power Rail (VIN)
+---------------------------------------------+ | Intel Core i3/i5/i7 | | (PGA988 / Socket G2) | +----------------------+----------------------+ | FDI / DMI Bus | +----------------------+----------------------+ | Intel HM65 | | (PCH / HM65 SLJ4P) | +-------+--------------+---------------+------+ | | | LPC SATA PCIe | | | +-------+-------+ +---+---+ +-------+------+ | IT8518E EC | | HDD | | Realtek RTL | | (Super I/O) | | /SSD | | (LAN/Audio) | +---------------+ +-------+ +--------------+
The system requires a default input voltage of from the external AC/DC Adapter via the DC-In jack. The first stage protection relies on dual P-channel MOSFETs acting as isolation switches. If a catastrophic short-circuit appears downline, the charging controller forces these gates high, decoupling the global input rail to protect sub-components. Always-On Power Delivery ( S5 Standby State)
) indicates . The line must drop to 0V ground to trigger its intended function. Component Labeling codes: PR = Power Resistors PC = Power Capacitors PU = Power Integrated Circuits (ICs) PQ = Power Transistors / MOSFETs 671w24h0d02a gp schematic
When the power button triggers the system, the Embedded Controller processes the active command signal and steps up the logic blocks into standard operation.
| Failure Symptom | Schematic-Powered Diagnosis | | :--- | :--- | | | Tracing the power distribution circuit from the DC jack through fuses and inductors to locate the short or break. | | Powers on, then shuts down after a few seconds | Checking the "Power Good" (PG) signals and voltage sequencing to find which rail is failing. | | No video on internal LCD | Following the LVDS (display data) lines and backlight enable signals from the PCH to the LCD connector. | | Keyboard malfunctions | Verifying the KBC (Keyboard Controller) pin connections against the schematic to check for broken traces. |
Power regulation
: Measure across the main input current-sensing resistor. If the voltage sits at 0V, inspect the front-end dual isolation MOSFETs for gate leak short circuits or physical degradation. Locate the 3
What is the laptop showing? (e.g., completely dead, fan spins but no image, or failing to charge the battery?)
: Delivers baseline current exclusively to the ITE IT8518E Embedded Controller, clock crystal circuits, and the system BIOS ROM chip.
The designation identifies a specific motherboard found in various laptop models from different brands such as Itautec, Clevo, CCE, Bangho, and Megaware . It is known to be used in laptops including:
What specific are you currently dealing with (e.g., completely dead board, spinning fan with no display, liquid exposure, short circuit)? RAM: 2 DDR3 slots
: Alternates current at high frequencies (typically 50kHz to 100kHz) through the main step-down chopper transformer to convert high-voltage DC into low-voltage DC safely. 4. Secondary Output and Low-Voltage DC Rails
rPGA-988B, supporting 2nd and 3rd Generation Intel Core processors (Sandy Bridge/Ivy Bridge). Chipset: Intel HM65 (SLJ4P). RAM: 2 DDR3 slots, typically supporting up to 8GB. Video Outputs: 1x HDMI, 1x VGA. Technical Resources & Schematic
If you want, I can generate a schematic sheet (netlist-style) or a sample BOM and PCB footprint suggestions for this design—tell me which you prefer.