Computer-Aided Design (CAD) is the design and construction of a product by means of EDP. In the beginning, CAD software was a tool for technical drawings, but today CAD systems (2D and 3D CAD programs) include many more functions and support the design. CAD systems are used in almost all areas of technology: e.g. architecture, civil engineering, mechanical engineering, toolmaking, electrical engineering and even dental technology. Computer-Aided Engineering (CAE) refers to all forms of computer support of work processes in design to improve product design or facilitate the solution of technical problems for many industries. Photorealistic renderings facilitate the visualization of concepts and ideas. Designs can be tested under real conditions using simulations.
Compare CAD programs, CAE and CAM software in this current market overview. Among other things, the category CAD and CAE (E-CAD) includes solutions for electrical engineering and electrical installation, electrical building design, programming systems for laser, flame and waterjet cutting and CNC punching. CAD software for furniture and interior design, programs for the calculation of cam gears, articulated gears and electric cams as well as software for programming systems for 3D laser and water jet systems and many more are listed in this overview.
Once the charging IC verifies that the input voltage is correct and safe, it drives the gates of the entry MOSFETs to create the primary power rail: or B+ . Stage 2: The Always-On Standby Rails ( +3VALW and +5VALW )
: Near the charging connector, you will likely find two main power MOSFETs (Metal-Oxide-Semiconductor Field-Effect Transistors) labeled PQxxx in the schematic. These transistors act as gatekeepers for the incoming power. With the charger unplugged, use the diode mode on your multimeter to check for a short circuit on these components. A common way to test is to check between their drain (D) and source (S) pins. A good MOSFET will not show a short.
is engineered by Compal for high-efficiency Intel Core i5 and i7 mobile processors, specifically the Kaby Lake and Skylake U-series generations.
According to standard Compal diagrams, the LA-D402P is designed for configurations, meaning it usually lacks dedicated graphics and relies on integrated Intel HD Graphics. CPU: Soldered Intel Core i5 or i7 (7th Gen). RAM: Soldered (8GB or 16GB). la-d402p schematic
: The highly regulated, high-current power rail for the CPU. 3. Embedded Controller (EC) / Super I/O Circuit
: Finding the exact part numbers for surface-mount resistors or capacitors that may have burned out.
A. Short-Circuited Ceramic Capacitors (MLCCs) on the B+ Rail Once the charging IC verifies that the input
Dual-channel DDR4 SODIMM slots supporting up to 32GB RAM.
The B+ rail distributes 19V across the entire motherboard, feeding all major step-down (buck) controllers. The first controller to wake up is the 3.3V/5V regulator.
Search for the ACOK (AC Adapter OK) signal line. If ACOK is low, the charging IC refuses to open the gates. 2. Short Circuit on the Main Rail (+VIN) With the charger unplugged, use the diode mode
Use a DC bench power supply to perform a voltage injection test on the +VIN line (keep voltage under 1V, but allow current to rise). Locate the component generating heat using a thermal camera or isopropyl alcohol. 3. Power Light Blinks, but No Display (Three-Blink Loop)
Refer to the "Power States" table usually found on the third or fourth page of the schematic. This table outlines which power rails should be active in S0 (Working), S3 (Sleep), and S5 (Soft-off) states, saving you guesswork during diagnostics. Conclusion