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 Techno Logic, Inc.
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La-c781p Schematic

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La-c781p Schematic

La-c781p Schematicﾂ SEGGER社製

J-Link ARM Pro is a refined version of the regular J-Link. It has an Ethernet interface in addition to the USB interface, as well as two additional LEDs which are used as hardware status indicators. It connects via Ethernet or USB to the Windows (2000/XP/Vista) PC host. J-Link ARM Pro is fully compatible with J-Link ARM and can be used "out-of-the-box". J-Link ARM Pro uses DHCP per default. The built-in webserver makes manual configuration easy and convenient. Ethernet allows using the emulator far away from the PC in a development or production environment; download and debugging speed is higher and Ethernet provides electrical isolation from the PC.

Features:

La-c781p Schematic Fully compatible to J-Link ARM
La-c781p Schematic Ethernet interface
La-c781p Schematic USB 2.0 interface
La-c781p Schematic Any ARMﾂｮ7/9/11, Cortex邃｢-M3 core supported, including thumb mode
La-c781p Schematic More memory for future firmware extensions (ARM11, X-Scale, Cortex R4, Cortex A8)
La-c781p Schematic Additional LEDs for power and RESET indication
La-c781p Schematic Comes with web interface for easy TCP/IP configuration (built-in webserver)
La-c781p Schematic Built-in GDB Server (planned to be implemented in the near future)
La-c781p Schematic Serial Wire Debug (SWD) supported
La-c781p Schematic Serial Wire Viewer (SWV) supported
La-c781p Schematic y
La-c781p Schematic Maximum JTAG speed 12 MHz
La-c781p Schematic Download speed up to 720 Kbytes/second * (higher download speeds will be available in the near future)
La-c781p Schematic DCC speed up to 800 Kbytes/second *
La-c781p Schematic Seamless integration into the IAR Embedded Workbenchﾂｮ IDE
La-c781p Schematic Powered through USB or power supply which comes with J-Link ARM Pro
La-c781p Schematic Support for adaptive clocking
La-c781p Schematic All JTAG signals can be monitored, target voltage can be measured
La-c781p Schematic Support for multiple devices
La-c781p Schematic Fully plug and play compatible
La-c781p Schematic Standard 20-pin JTAG connector
La-c781p Schematic Wide target voltage range: 1.2V - 3.3V, 5V tolerant
La-c781p Schematic USB and 20-pin ribbon cable included
La-c781p Schematic Memory viewer (J-Mem) included
La-c781p Schematic Comes with licenses for: J-Link ARM RDI, J-Link ARM FlashBP, J-Link ARM FlashDL, J-Link ARM GDB Server, J-Flash ARM
La-c781p Schematic Software Developer Kit (SDK) available
La-c781p Schematic Embedded Trace Buffer (ETB) support
La-c781p Schematic Adapter for 5V JTAG targets available
La-c781p Schematic 14-pin JTAG adapter available
La-c781p Schematic Galvanic isolation from host system via Ethernet
La-c781p Schematic Optical isolation adapter available
La-c781p Schematic Target power supply: J-Link can supply up to 300 mA to target with overload protection.

* = Measured with J-Link ARM Pro Rev. 1, ARM7 @ 50 MHz, 12MHz JTAG speed.

 La-c781p Schematic

　

La-c781p Schematic Direct

Low-dropout regulator pins on the step-down controller, RTC battery circuit. / +5V_ALWAYS 3.3V / 5.0V Primary inductor coils, system power management IC (PMIC). +1.35V_VCC

Features an Intel Core i3/i5/i7 processor (typically Broadwell or Skylake architecture, depending on the exact board revision). The CPU and Platform Controller Hub (PCH) are integrated onto a single die.

Page 48: comes from TPS51285 (PU501). Measure:

If the 19V rail is stable but the laptop doesn't start, check for the . La-c781p Schematic

Large power chokes used in buck converter circuits to smooth out current variations.

The dedicated power rail for the discrete NVIDIA graphics chip. 3. Common Failures and Troubleshooting Workflows

First measure (page 45). If missing, the issue is in PM_SLP_S3# from PCH. If present, check ISEN/VSEN pins on the multiphase controller (typically ISL95855A). Low-dropout regulator pins on the step-down controller, RTC

Locate the SPI Flash IC (usually an 8-pin SOIC chip near the PCH). Check for +3V on Pin 8 ( VCC ) and use an oscilloscope to check for data activity on Pin 2 ( DO ) and Pin 5 ( DI ) right at turn-on. If voltage is present but there is no data handshake, reprogramming the BIOS chip is required. 6. Tips for Reading the Schematic PDF

Before decoding the schematic, it窶冱 critical to understand the hardware.

To aid in your repair, here is a detailed table of crucial voltage values, which serve as a reference for a functioning LA-C781P motherboard. The CPU and Platform Controller Hub (PCH) are

If the laptop shows no signs of life (no LEDs, no fan spin), technicians must first locate the inductors (coils) for these two rails to verify if 3.3V and 5V are present immediately after plugging in the AC adapter. Secondary and Run Rails ( +1.0V_RUN , +1.35V_RAM , +VCC_CORE )

Repairing modern laptops often feels like navigating a maze without a map. If you are working on an HP 15-af series laptop, that map is the Compal LA-C781P

If you are currently troubleshooting a specific issue on this motherboard, let me know (e.g., completely dead, fan spins but no display, blinking LED error codes), what power rails you have already measured , and if you have access to a DC regulated power supply . I can guide you to the exact components or pins to check next. Share public link

　

La-c781p Schematic
La-c781p SchematicLa-c781p Schematic
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