Once the power button is pressed, the following should activate in order: +1.2V / +1.35V: RAM Power (DDR4). +1.0V / +1.05V: PCH/Chipset Core. +VCC_CORE:
: The laptop does not respond to the power button, and no LEDs illuminate.
diagram that outlines voltage rails (e.g., +3V, +5V, +1.0V) and the charging circuit for the lithium-ion battery. Where to Find Schematics
| Marking | Likely Actual Part | |--------|---------------------| | LAH103P | LAH103 (generic hybrid) | | LAH103P | HA103P (often a optocoupler) | | LAH103P | LA103P (voltage regulator) | lah103p schematic new
For active repairs, technicians often use the schematic alongside a file, which provides a visual layout of the PCB.
Once you have the model number, change your search query.
💡 If you can't find a component labeled on the board, search the schematic for the "PU" (Power Unit) or "PQ" (Power Quarter/Transistor) number to find its functional group. If you'd like, I can help you further if you tell me: Once the power button is pressed, the following
Repair professionals often use these documents for board-level troubleshooting. You can find searchable PDF versions and BoardView files on specialized databases like Laptop-Schematics.com locating specific components on this board?
4GB/8GB Onboard DDR4 + 1x SODIMM Slot (supports up to 20GB/36GB total)
This public link is valid for 7 days and shares a thread, including any personal information you added. This link or copies made by others cannot be deleted. If you share with third parties, their policies apply. Can’t copy the link right now. Try again later. diagram that outlines voltage rails (e
(Rev 1.0) is a motherboard manufactured by Compal for the Lenovo IdeaPad S340-15IIL S340-14IIL
Available in both UMA (Unified Memory Architecture using integrated Intel UHD/Iris Xe Graphics) and DIS (Discrete GPU, typically NVIDIA GeForce MX series) configurations.
3. No Display / Caps Lock Blinking (Missing Power Good Signal)