The details the circuitry of the internal Switch-Mode Power Supply (SMPS) board manufactured by Lite-On, found in budget-friendly Dell monitors like the Dell E2316H, E2016HL, E2316HF, E1916HV, and SE2216HV . This compact power board (part number 491A011H1400H03 ) converts AC mains voltage into regulated low-voltage DC rails to power the monitor’s primary logic board and its LED backlighting. Understanding this schematic diagram is key for component-level troubleshooting, allowing technicians to diagnose issues like no-power symptoms, flashing power lights, or sudden display blackouts. Architectural Breakdown of the ILPI-354 V.A Board
Main Input Line Fuse (F101), Primary Power MOSFET, SMPS Controller IC
probe the primary side of this schematic with a standard oscilloscope unless using an isolation transformer. The "hot ground" (negative side of the main rectifier) carries lethal voltage (310V DC) relative to earth ground. Discharge the large primary capacitors (C1, C2) via a 10kΩ 5W resistor before touching the board. Ilpi-354 V.a Schematic
You can find these boards on 365 Power Supply ($19.00 39.00 ), AliExpress , and eBay ($20.00).
This public link is valid for 7 days and shares a thread, including any personal information you added. This link or copies made by others cannot be deleted. If you share with third parties, their policies apply. Can’t copy the link right now. Try again later. The details the circuitry of the internal Switch-Mode
The functional landscape of the ILPI-354 V.A schematic maps out two distinct stages separated by a physical isolation boundary line marked on the PCB layout.
A full-wave bridge rectifier converts AC voltage to pulsating DC, which is smoothed into roughly 310V–340V DC (on 220V grids) by a large electrolytic bulk capacitor (usually rated for 450V). Architectural Breakdown of the ILPI-354 V
, this board acts as the "heart" of the display, transforming raw AC mains power into stable, regulated DC rails required by the system's logic scaler board and LED backlights. Understanding the core stages of this architecture allows technicians to rapidly troubleshoot and repair common display failures like unresponsiveness, blinking power lights, or the infamous "black screen of death." Architectural Layout of the ILPI-354 V.A Board
A complete schematic for the Ilpi-354 V.a is divided into several logical sections, each serving a distinct purpose in the monitor's power management:
| | Component Type | Specifications / Value | Notes & Common Failures | | :--- | :--- | :--- | :--- | | U850 | PWM Controller IC | SOT-23-6 package; Silk screen DP=*** or IDP=F** ; Equivalent: R7731AGE | Often fails (cracked/burst) during a power surge; VDD pin should be ~14.99V under normal conditions | | R845 | SMD Resistor (Sampling) | 0805 package; 271 (270Ω) | Frequently burns out and becomes open-circuit; common failure in the PWM feedback loop | | R848 | Resistor (MOSFET Drive) | 1/8W through-hole or 1206; 100 (10Ω) | May burn out when the MOSFET fails; located on pin 6 of the PWM controller | | R869 | Resistor (Current Sense) | 2W 1Ω (or 1.1Ω/0.86Ω) | Often fails open-circuit due to high current draw in the primary side | | F850 | Primary Fuse | 2.5A square fuse | Blows to protect downstream components; sometimes replaced with 3.15A as a temporary repair | | Q850 | Main MOSFET (Switching Transistor) | N-channel, 4A 650V; PDF04N65L (TO126) | A very common failure point—often short-circuits; can be replaced with SVF4N65F (TO220F) with heat sink modification | | D854 | Schottky Diode (Output Rectifier) | SR5200 (5A 200V) | Frequently short-circuits; this failure can cause unstable output voltages | | C852 | Y Capacitor / Safety Capacitor | Near the AC input | Related to potential burned traces on the PCB due to arcing in this area |
The details the circuitry of the internal Switch-Mode Power Supply (SMPS) board manufactured by Lite-On, found in budget-friendly Dell monitors like the Dell E2316H, E2016HL, E2316HF, E1916HV, and SE2216HV . This compact power board (part number 491A011H1400H03 ) converts AC mains voltage into regulated low-voltage DC rails to power the monitor’s primary logic board and its LED backlighting. Understanding this schematic diagram is key for component-level troubleshooting, allowing technicians to diagnose issues like no-power symptoms, flashing power lights, or sudden display blackouts. Architectural Breakdown of the ILPI-354 V.A Board
Main Input Line Fuse (F101), Primary Power MOSFET, SMPS Controller IC
probe the primary side of this schematic with a standard oscilloscope unless using an isolation transformer. The "hot ground" (negative side of the main rectifier) carries lethal voltage (310V DC) relative to earth ground. Discharge the large primary capacitors (C1, C2) via a 10kΩ 5W resistor before touching the board.
You can find these boards on 365 Power Supply ($19.00 39.00 ), AliExpress , and eBay ($20.00).
This public link is valid for 7 days and shares a thread, including any personal information you added. This link or copies made by others cannot be deleted. If you share with third parties, their policies apply. Can’t copy the link right now. Try again later.
The functional landscape of the ILPI-354 V.A schematic maps out two distinct stages separated by a physical isolation boundary line marked on the PCB layout.
A full-wave bridge rectifier converts AC voltage to pulsating DC, which is smoothed into roughly 310V–340V DC (on 220V grids) by a large electrolytic bulk capacitor (usually rated for 450V).
, this board acts as the "heart" of the display, transforming raw AC mains power into stable, regulated DC rails required by the system's logic scaler board and LED backlights. Understanding the core stages of this architecture allows technicians to rapidly troubleshoot and repair common display failures like unresponsiveness, blinking power lights, or the infamous "black screen of death." Architectural Layout of the ILPI-354 V.A Board
A complete schematic for the Ilpi-354 V.a is divided into several logical sections, each serving a distinct purpose in the monitor's power management:
| | Component Type | Specifications / Value | Notes & Common Failures | | :--- | :--- | :--- | :--- | | U850 | PWM Controller IC | SOT-23-6 package; Silk screen DP=*** or IDP=F** ; Equivalent: R7731AGE | Often fails (cracked/burst) during a power surge; VDD pin should be ~14.99V under normal conditions | | R845 | SMD Resistor (Sampling) | 0805 package; 271 (270Ω) | Frequently burns out and becomes open-circuit; common failure in the PWM feedback loop | | R848 | Resistor (MOSFET Drive) | 1/8W through-hole or 1206; 100 (10Ω) | May burn out when the MOSFET fails; located on pin 6 of the PWM controller | | R869 | Resistor (Current Sense) | 2W 1Ω (or 1.1Ω/0.86Ω) | Often fails open-circuit due to high current draw in the primary side | | F850 | Primary Fuse | 2.5A square fuse | Blows to protect downstream components; sometimes replaced with 3.15A as a temporary repair | | Q850 | Main MOSFET (Switching Transistor) | N-channel, 4A 650V; PDF04N65L (TO126) | A very common failure point—often short-circuits; can be replaced with SVF4N65F (TO220F) with heat sink modification | | D854 | Schottky Diode (Output Rectifier) | SR5200 (5A 200V) | Frequently short-circuits; this failure can cause unstable output voltages | | C852 | Y Capacitor / Safety Capacitor | Near the AC input | Related to potential burned traces on the PCB due to arcing in this area |