Ps42419ha Schematic Work ★ Tested & Working

: Alternating current (AC) enters through the plug. A fuse protects the board from power surges. Filters clean up electrical noise so the power is smooth.

: Damaged standby voltage IC or the resistor powering the IC .

For further research, the following sources were used to create this guide:

If you are performing "schematic work" for a repair, common failure points identified by technicians include: ps42419ha schematic work

To drive the gate of the upper N-channel switching MOSFET, the voltage at the BST pin must be higher than the VIN supply. A small ceramic capacitor (usually 0.1µF, rated for 25V or 50V) is placed directly between the BST pin and the SW pin. When the SW pin transitions to ground, this capacitor charges up through an internal diode, ready to pump the gate drive when the SW node goes high. Schematic Design Checklist

VOUT=VREF×(1+RTOPRBOTTOM)cap V sub cap O cap U cap T end-sub equals cap V sub cap R cap E cap F end-sub cross open paren 1 plus the fraction with numerator cap R sub cap T cap O cap P end-sub and denominator cap R sub cap B cap O cap T cap T cap O cap M end-sub end-fraction close paren Choose a value between 10kΩ and 100kΩ for

Technicians often perform component-level repairs on this model when the unit fails to provide power. Key areas of focus in the schematic work include: : Alternating current (AC) enters through the plug

RBOTTOMcap R sub cap B cap O cap T cap T cap O cap M end-sub ) sets the target output voltage ( VOUTcap V sub cap O cap U cap T end-sub ) based on the internal reference voltage ( VREFcap V sub cap R cap E cap F end-sub

The junction where the internal high-side and low-side MOSFETs meet. This pin connects directly to the power inductor.

For specific disassembly layouts, refer to HP's Maintenance and Service Guides . : Damaged standby voltage IC or the resistor powering the IC

Usually shorted (Drain to Source) or leaky.

However, based on the available data, a partial block diagram can be inferred:

Using the board layout, you can recreate a rudimentary schematic. Look for the (4 pins). The transistor side (pins 1-2) is the primary . The LED side (pins 3-4) is the secondary . If the secondary side is shorted, the LED stays on, the transistor conducts, and the primary shuts down.