Ps42419ha Schematic Top
Insert one end of a paperclip into the and the other into an adjacent Black wire pin .
Tucked neatly between the main primary capacitor and the central power transformers sits the auxiliary power section. This zone operates continuously whenever the unit is plugged into an active AC outlet to maintain a standby voltage rail for the motherboard.
This power supply is known to fit tight cases where space is a premium and plays a key role in maintaining stable operation in office or home environments.
Uses high-frequency transformers and FETs to convert the high-voltage DC into regulated output voltages. Common Faults and Repair Solutions ps42419ha schematic top
: Driven by a PWM controller chip to feed the main step-down high-frequency transformer. 3. Standby Circuitry (The 12VSB Top-Level Flow)
A frequently overlooked detail: the schematic top shows a dotted line connection for the bootstrap caps. If those caps are not installed or are too small, the high-side IGBTs will fail to turn on, leading to a “dead” phase.
For detailed visual walkthroughs of the component locations mentioned, you can watch the HP PS-4241-9HA PSU Repair Video on YouTube . Insert one end of a paperclip into the
[Main Bulk Cap] ---> [1-Ohm Resistor] ---> [TNY279PN Drain] ---> [Standby Transformer] | (If shorted) v [Resistor Blows Open] Fluctuating Output or Continuous Clicking
HP used multiple OEMs for their power supplies, which can lead to identical external model numbers but vastly different internal designs. The PS-4241-9HA is most frequently manufactured by , while the visually identical HP-D2402A0 is made by Hipro (identified by the "HP-" prefix).
The positive rail from C5 led to the primary winding of a large transformer, . But before it could enter the transformer, it took a detour through a small, three-legged component: Q1 , the main switching transistor. The schematic showed a tiny clock icon next to its gate pin. That clock came from a black box labeled IC1 (PWM Controller) —a TL494. This was the heart. It pulsed Q1 on and off tens of thousands of times per second, creating a high-frequency AC inside T1. That was the secret: scream across the magnetic gap to shrink the copper and iron. This power supply is known to fit tight
| Pin # | Symbol | Function | |-------|--------|-----------| | 1 | P | Positive DC bus input | | 2 | VB1 | High-side floating supply for U-phase | | 3 | VS1 | Floating ground reference for U-phase | | 4 | VB2 | High-side floating supply for V-phase | | 5 | VS2 | Floating ground reference for V-phase | | 6 | VB3 | High-side floating supply for W-phase | | 7 | VS3 | Floating ground reference for W-phase | | 8 | VCC | Low-side logic supply (15V typical) | | 9 | GND | Control ground | | 10 | HIN1 | PWM input for high-side U | | 11 | LIN2 | PWM input for low-side V | | 12 | HIN3 | PWM input for high-side W | | 13 | N | Negative DC bus (power ground) | | 14 | U | Output phase U (motor connection) | | 15 | V | Output phase V | | 16 | W | Output phase W | | 17 | FO | Fault output (active low) | | 18~24 | CIN, VTH | Current sense & temperature sense |
| Specification | Details | | :--- | :--- | | | PS-4241-9HA | | Brand | HP (Hewlett-Packard) | | Form Factor | Small Form Factor (SFF) | | Wattage | 240 Watts | | Output | 12V DC, proprietary ATX connector | | Compatible Systems | HP Elite 6000/8000 series, HP Pro 6000/6200 series (SFF models) | | Alternate P/Ns | 503376-001, 508152-001, PC8019, PC9058 |
Analyzing the top view of the PS-4241-9HA motherboard reveals a classic split-plane configuration separating the high-voltage Primary Side from the low-voltage Secondary Side. The board layout follows a directional current path designed to minimize electromagnetic interference (EMI) and regulate thermal dissipation. 1. AC Input & EMI Filtering Stage (Rear Entry)
): A large capacitor (420V or 450V rated) that smooths the high-voltage DC.
If troubleshooting is outside your skill set or the damage is extensive, replacing the unit is the most reliable solution. Ensure the replacement is a for your system.