This revision supports a range of configurations that balance efficiency with performance: Processor Support:
: Supports DDR4 2133MHz at 1.2V with interleaved memory design for better performance compared to older single-channel configurations.
The voltage from the DC-in jack passes through the first and second protection MOSFETs. It is governed by a charging IC (often from the Intersil/Renesas ISL series or Texas Instruments BQ series). Once the gates of these input MOSFETs are properly driven, the primary system rail—commonly designated as or +19V —becomes active across the entire motherboard. Step 2: The Always-On Standby Voltages ( +3VALW and +5VALW ) lae791p rev 20 schematic better
: Use the schematic to identify the gate signal for the input MOSFETs (often controlled by the Charging IC). Check if the current sensing resistor is detecting a short to ground. 3V/5V Rail Issues : Fault : The motherboard is "dead" with no standby lights.
Before you start, a word of caution: Some sources require completing surveys or paying for access before providing files. It's wise to cross-reference any information you find on one site with another. If a survey asks for sensitive information, it is safer to look for a different source. This revision supports a range of configurations that
rails. A common "no power" culprit is the first or second entry MOSFET (often controlled by the BQ-series charging IC). System Power Rails (3V/5V) : Search for the
The DC-in voltage (+19.5V) enters the board and must pass through two protective N-channel MOSFETs managed by the charging IC. Once the gates of these input MOSFETs are
Navigate to the for the CPU/SOC.
Signal test points may not align with physical board revisions. Matches the physical PCB layout, preventing short circuits. Outdated part numbers make replacing components difficult.
Check +19V at the drain pins of the first two protection MOSFETs ( PQ1 and PQ2 ).
If you have the schematic (in PDF or image form), I can assist with: