Protection and filtering on outputs
: This indicates an inverter fault. Check for a shorted inverter MOSFET or a failed CCFL lamp. Work on this board involves lethal voltages wannien 101v0 power supply schematic verified
The schematic indicated a Y-capacitor between primary ground and secondary ground. Physical inspection confirmed a 2.2 nF / 250V Y1 capacitor present, critical for EMI reduction and safety isolation. Protection and filtering on outputs : This indicates
LED strips, 3D printers (as auxiliary supply), CCTV cameras, audio preamps, battery chargers. Physical inspection confirmed a 2
| Reference | Component | Value/Rating | Verification Notes | | :--- | :--- | :--- | :--- | | | Fuse | 5A / 250V (Slow Blow) | Verified by physical removal | | RV1 | Varistor | 14D471K | Confirmed clamping voltage | | IC1 | PWM Controller | LD7750R (SOP-8) | Pin 5 (GND), Pin 8 (HV) | | Q1 | MOSFET | SVD11N60T | Rds(on) 0.39 Ohm max | | T1 | Transformer | EE28-101V0 | Primary: 42T, Aux: 7T, Sec: 9T | | D8 | Output Diode | MBRF20100CT | Common cathode | | R17 | Current sense | 0.22 Ohm / 2W | Metal film, verified tolerance |