La-d402p - Schematic [portable]

host similar Compal service manuals that detail voltage rail sequences ( positive 3 cap V cap A cap L cap W positive 5 cap V cap A cap L cap W , etc.) essential for "dead" laptop recovery. Are you troubleshooting a specific power issue or just looking to learn about motherboard architecture

| Symptom | Likely Area | Look for in Schematic | |---------|-------------|------------------------| | No power, no LED | DC-in MOSFETs (PQ201, PQ202) | Page 7 – Charger circuit (BQ24780S) | | 3V/5V missing | PU601 enable signal | Page 11 – EN3V5V from EC | | Short on main power | High-side MOSFET or capacitor | Check B+ rail – page 6 | | No display, backlight OK | LCD_VDD, EDP_HPD | Page 34 – LCD connector pin 5 (EDP_HPD) | | Battery not charging | SMBus lines (SCL/SDA) to BQ24780 | Page 8 – Battery connector pins 3 & 5 | la-d402p schematic

Block diagram & power sequence

A schematic tells you how the circuit works. A tells you where the component is physically located. host similar Compal service manuals that detail voltage

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