Ilpi354 Va Schematic Updated ((full)) -

You know it’s a power management IC. You know it’s probably the reason Pin 1 of your main DC jack has 19V, but the BIOS chip is dead silent.

Examine the pins of large components (transformers, connectors) for cracks or dullness, which can cause intermittent connection issues. 3. Basic Diagnostic Steps ilpi354 va schematic updated

Most versions utilize the LD7575 or a similar Green-Mode PWM controller. The updated schematic confirms the startup resistor values (typically high-resistance, e.g., 1MΩ) which often fail open. You know it’s a power management IC