Upd — La-h103p Schematic
Understanding the Compal LA-H103P Motherboard: A Schematic Guide
Processor: Integrated Intel Core i3/i5/i7 (10th Gen Comet Lake-U). RAM: Dual DDR4 SODIMM slots. la-h103p schematic
- Produce a printable troubleshooting checklist tailored to LA-H103P with likely voltages at key TPs (assume typical laptop rails), or
- Highlight specific ICs and their expected pin voltages if you provide a photo of your board.
The is the motherboard part number for the Lenovo IdeaPad S340-14IIL Go to product viewer dialog for this item. and S340-15IIL Go to product viewer dialog for this item. The is the motherboard part number for the
Indiafix: Offers downloads for the LA-H103P Rev 1.0 Schematic and Boardview. Components
Strengths of the Design:
Locate Shorts: Use the schematic to find which capacitors are linked to a shorted rail like +3.3V_ALW or +5V_ALW.
- Visual inspection: swollen capacitors, burnt components, cracked solder joints, corroded connectors.
- Measure DC jack voltage: confirm adapter voltage at jack and at the first fuse/MOSFET.
- Check battery voltage at battery connector and charger IC pins.
- Confirm main rails: 3.3V, 1.8V, and VCC_CORE where shown on schematic. If a rail is missing, trace backwards to regulator enable pins and switching components.
- Probe PWR_OK / PWRGD / EN signals on schematic — if these are low, the downstream devices will remain off.
- Inspect EC reset and clock lines; check SPI flash presence and clock. Some boards won’t boot if EC is unresponsive.
- For display issues: measure panel backlight voltage and inverter signals, test with external monitor to isolate GPU vs. panel.
- Use a thermal camera or freeze spray to find failing components (shorts often heat up).
- If a short exists on a rail, perform resistance-to-ground checks with power disconnected; identify shorted component groups (VRM, caps, MOSFETs).
- Replace suspect components with known-good parts and reflow suspicious joints.
Components
Strengths of the Design: