L1 is a 47µH toroidal inductor (wound with 1.2mm wire to handle 12A). Saturation current must exceed 15A; otherwise, the inductor heats up and output ripple skyrockets.
The output capacitors are two 1000µF/35V low-ESR types (e.g., Nichicon PW series). A 0.1µF ceramic cap in parallel filters high-frequency noise.
Let’s break down the schematic into functional blocks. s36012 power supply circuit diagram
Modern TVs require efficient power usage. The S36012 typically utilizes a PFC controller IC (such as the FAN7930 or similar) to boost the rectified voltage.
In the world of electronics repair and maintenance, specific part numbers often become shorthand for entire families of devices. The S36012 is one such designation, widely recognized as the core component or model number for the switch-mode power supply (SMPS) boards found in popular brands of LED LCD televisions (notably models from Sanyo, Singer, and various OEM brands). L1 is a 47µH toroidal inductor (wound with 1
For electronics technicians and DIY enthusiasts, understanding the circuit diagram of the S36012 power supply is essential for diagnosing "dead TV" symptoms, backlight failures, and power cycling issues. This article provides a comprehensive overview of the S36012 power supply architecture, key components, and common fault points.
| RefDes | Component Type | Value / Part Number | Notes | | :--- | :--- | :--- | :--- | | F1 | Fuse | 5A 250V | Safety rated | | BR1 | Bridge Rectifier | KBL406 | 600V PIV | | C1 | Electrolytic Cap | 100uF 400V | Bulk storage | | Q1 | N-Channel MOSFET | FQP10N60C | Primary switch | | U1 | PWM Controller | UC3843B | Current mode control | | T1 | Flyback Transformer | Custom S36012 | Pri: 120T, Sec: 10T | | Dout | Schottky Diode | SR560 | Output rectifier | | U2 | Shunt Regulator | TL431A | Voltage reference | | U3 | Optocoupler | PC817 | Signal isolation | | RefDes | Component Type | Value /
Refer to the feedback network: Tap the output voltage divider before the pot to feed a panel meter. Do not load the FB pin with a low-impedance meter (use a buffer op-amp).
AC Input (L,N) --> EMI Filter --> Bridge Rectifier --> Bulk Capacitors --> MOSFETs
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[PWM IC KA7500C]
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Main Transformer --> Schottky Diodes --> LC Filter --> DC Output (+12V)
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Aux Winding --> Vcc for PWM IC |
Feedback Divider
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Optocoupler <-- TL431