La-e801p Rev 2.0 Schematic Upd -
SMSC/Microchip MEC1414 or MEC1418, managing power sequencing, keyboard interface, and thermal monitoring.
Verify that the IC receives its main power supply hookup ( VIN ) at its dedicated pin.
: Find the backlight enable pin line coming directly from the Super I/O array. It must switch cleanly to when the device initializes. Verify Panel VCC : Check the
The LA-E801P is the primary motherboard used in the , Dell Inspiron 14-3458 , and several other Dell 3000 series laptops. These are workhorses found in offices, schools, and homes worldwide. Consequently, they flood repair shops with common issues: no power, no display, fan spinning but no boot, and short circuits.
[19V DC-In Adapter] ──> [+19V_VIN] ──> [+3VALW / +5VALW Buck Converter] │ ┌────────────────────────────────────────┴────────────────────────────────────────┐ ▼ (S5 State) ▼ (S3 State) [+3V_EC / Power Button Active] ──> [EC Triggers PM_PWRBTN# to SoC] ──> [SoC Releases SLP Signals] ──> [+1.2V DDR4 VRAM Rail] │ ▼ (S0 Full Power State) [+1.0V PCH] ──> [+VCC_CORE] ──> [+VCC_GT] The Primary Voltage Rails la-e801p rev 2.0 schematic
Page 1 or 2 usually shows how the CPU, RAM, and PCH interact.
If your DC adapter light turns off as soon as you plug it into the laptop, you have a on the main power rail.
: Frequently lists Compal-based board diagrams for download.
If the charging IC (often an Intersil/Renesas ISL series chip) senses a healthy voltage, it opens the isolation gates to establish the +PWR_SRC bus. It must switch cleanly to when the device initializes
The LA-E801P Rev 2.0 schematic is a vital resource for anyone working with this specific circuit board. By understanding the schematic's components, applications, and troubleshooting techniques, you can efficiently identify and resolve issues, optimize performance, and ensure the board's reliable operation. Whether you're an engineer, technician, or manufacturer, this comprehensive guide has provided you with the knowledge and best practices necessary to unlock the secrets of the LA-E801P Rev 2.0 schematic.
Search for KB9022 in the schematic. Verify pins like VCC (power supply), WRST# (Reset signal), and EC_RST# . If the EC is not getting power or remains locked in a reset state, it will never assert the PM_PWRBTN# signal to wake the Intel CPU.
The EC or PCH activates secondary switches to turn on +3V , +5V , +1.2V , and finally the CPU +VCC_CORE .
If standby voltages are healthy but the power button yields no response, your schematic exploration must shift focus to the Super I/O (Embedded Controller): Consequently, they flood repair shops with common issues:
: Locate the PUM1 chip area. Ensure the DDR4 rail outputs an exact
: The primary 19V line enters through the DC jack and passes through protection MOSFETs. A known troubleshooting point involves the transistor and the
The SPI Flash ROM holding the system BIOS or the internal firmware of the ENE KB9022Q EC becomes corrupted.
BGA-soldered Intel Core i3/i5/i7 (Skylake/Kaby Lake U-Series).
The adapter voltage passes through the input protection MOSFETs (first and second protection gates). The charging IC (often an Intersil/Renesas or Texas Instruments bq-series chip) checks if the voltage is stable and outputs an (AC Adapter OK) signal to the Embedded Controller. Step 2: Always-On Rails