Copy C:\Grub4dos\grub.exe to the root of your boot drive/device. Boot from the device and wait for the DOS prompt, then type grub.exe [ENTER] to load grub4dos. If using Windows 9x, press the [F8] key to enter the safe mode boot menu and choose option Command prompt only or Safe mode command prompt only, then type grub.exe [ENTER].
Copy C:\Grub4dos\grub.exe to the root of your boot drive/device. Add an entry to config.sys - to add an option to a Windows 98 (SE) boot disk menu, edit config.sys (in a text editor such as notepad) and add the following entries (for changes to original config.sys see here - changes are in red text) -
is a complex, multi-layer printed circuit board (PCB) designed around the Intel Skylake or Kaby Lake (6th/7th Generation) processor ecosystem. Understanding its core architecture is the first step in utilizing the schematic effectively. Core Chipsets
A schematic tells you exactly which resistor or capacitor is burnt, allowing you to use a boardview to find its location and replace it.
The DC jack injects 19V into the board. This voltage passes through a protection fuse and two N-channel isolation MOSFETs. The charging IC (often an ISL88739 or BQ series) must output an or ACOK signal to the Embedded Controller (EC) to verify a valid power source is connected. If the gates of the entry MOSFETs do not receive their driving voltage, the +19V rail will stop at the first transistor. 2. Standby Rail Generation (+3VALW / +5VALW)
Based on field reports from repair shops, here are the top failures for the LA-D401P platform: la-d401p schematic
The Compal LA-D401P is a highly logical, well-documented motherboard platform. Armed with the official schematic, a reliable boardview software (such as NeoViewer or OpenBoardView), and a solid grasp of Intel's power-up states, you can systematically diagnose and repair complex board-level faults rather than relying on expensive, unnecessary motherboard replacements.
The is a widely manufactured laptop motherboard engineered by Compal Electronics . It primarily powers the Dell Inspiron 15 3000 and 5000 series laptops (specifically models like the Inspiron 3567 and 5567) utilizing 6th and 7th Generation Intel Core processors (Skylake and Kaby Lake U-processors).
This comprehensive technical guide provides a deep dive into the LA-D401P motherboard architecture, its primary power rails, common failure points, and step-by-step diagnostic workflows for hardware repair technicians. Motherboard Architecture Overview Go to product viewer dialog for this item. is a complex, multi-layer printed circuit board (PCB)
If you have opened the PDF and feel overwhelmed, follow this structured approach.
Because the HP Spectre 13 charges exclusively via Type-C, the USB-C controller chips (often Texas Instruments or Cypress controllers) undergo high thermal stress. If the laptop refuses to take 20V from the charger and stays stuck at 5V, the schematic will reveal the CC1/CC2 lines and the input MOSFETs that need to be tested. Corrupted BIOS / EC Firmware
Integrated Intel Core i3/i5/i7 Mobile Processor (U-series, ultra-low power). The DC jack injects 19V into the board
: Features soldered Intel Core i5/i7 6th or 7th Generation processors (such as the Skylake or Kaby Lake U-series, e.g., SR2EY).
When troubleshooting an LA-D401P board under a microscope, technicians frequently encounter several recurring failure points. Short Circuits on the +B+ Rail
When a laptop "won't turn on," the schematic helps you trace the voltage path. On the LA-D401P, you should check these rails in order:
Searching "LA-D401P boardview PDF" in specialized technician forums.
A sample config.sys is included in the Grub4dos download, this can be used to replace config.sys on your boot device - if using the sample file you will be prompted to press the [space] bar to start Grub4dos.
Autoexec.bat can also be used to launch Grub4dos - simply edit the file and add entry grub.exe.
To install grub4dos code to a hard disks MBR via DOS, copy C:\Grub4dos\BOOTLACE.COM to the root of a DOS bootable drive/disk. Now reboot your PC and boot into DOS. If using Windows 9x BOOTLACE.COM can be executed from a dos box (start > run > type command [enter]).
To install Grub4dos code to the MBR of the first hard disk (usually the first hard disk set to boot within the BIOS settings) use command -
To install Grub4dos code to the MBR of the second hard disk use command -
To avoid installing Grub4dos to the wrong disk use a third party tool such as MBRWizD.exe (available here) to check the disk order. Copy MBRWizD.exe to the root of the DOS bootable device and type MBRWizD.exe /List - you should be able to identify the correct disk from the attributes outputted by the command (to install to disk 0 - use command BOOTLACE.COM 0x80; to install to disk 1 - use command BOOTLACE.COM 0x81; etc.). You will also need to copy grldr and menu.lst to the root of a (supported) local drive/disk.
Using the Grubinst package, it is possible to install Grub4dos code to the partition boot sector. Although this feature is documented in bootlace.com, attempting to install to the bootsector (using the command bootlace.com --install-partition=0 0x80) results in the following -
Use instead the DOS version of grubinst tool - at the time of writing this guide the most recent version available is version is grubinst-1.1-bin-dos-2008-01-01 (file name grbins16.exe). Use command syntax grbins16.exe -p=n [device] or grbins16.exe --install-partition=n [device] (where n = partition number, starting from 0 for first partition. e.g. grbins16.exe -p=0 (hd0). If using Windows 9x, run grbins16.exe from a dos box (start > run > type command [enter]).
grldr must be copied to the partition on which the bootsector was installed, and the partition must be active. See here for Grubinst download.