Successfully repairing the motherboard requires tracing the circuit paths using a precise schematics viewer (such as OpenBoardView or traditional PDF schematics). When replacing the APW70 controller, always clean the solder pads thoroughly, apply high-quality flux, and ensure the thermal pad underneath the IC is perfectly bonded to the motherboard ground plane to prevent overheating and premature component failure.
To adapt the schematic:
The is a Compal-designed OEM motherboard tailored for the HP ZBook 17 G3 series. It supports Intel Core i7-6820HQ processors, up to 64GB DDR4 RAM, and discrete NVIDIA or AMD graphics. Given its high power consumption, the power delivery network (PDN) is complex, involving multiple switching regulators. Key Components on the Schematic
What exact is the laptop showing? (e.g., completely dead, blinking light codes, spinning fans but black screen) apw70 lac391p schematic portable
Compal LA-C391P (often labeled as ) is a specific laptop motherboard commonly found in Acer Aspire series laptops, such as the E5-573 or V3-574.
Locate the page labeled "Power Block Diagram" to identify which PWM chip creates which voltage rail, along with their respective component designators (e.g., PU401, PU402).
Once you have the LA-C381P schematic, you can begin systematic troubleshooting. The community has already reported and solved several common issues on the APW70 LA-C391P board: It supports Intel Core i7-6820HQ processors, up to
Do you need help identifying a or IC part number from this board? Share public link
| Source | Search term | Likely result | |--------|-------------|----------------| | (ex-HP/Agilent) website | LAC391P service manual | May have PDF under "obsolete products" | | Artek Media (manual seller) | APW70 schematic | High-quality scan of original | | ElektroTanya (free) | HP APW70 diagram | User-uploaded service manual | | KO4BB (HP/Agilent archive) | LAC391P | Large collection of old HP service docs |
While exact schematics are proprietary, the implementation of the usually follows a standard design topology. A. Input Stage ( VINcap V cap I cap N USB wake-up lines
Locate the power button pinout on the schematic. Ensure it sits at 3.3V and drops to 0V when pressed.
Post a request on the (Repair section) with:
Powers secondary standby circuits, USB wake-up lines, and serves as the internal driver voltage for other PWM controllers. Memory and System Rails (S3 and S0 States)
