"Bulging" or leaking capacitors in this section cause flickering screens. 5. Feedback Loop (Regulation)
If blown, check the bridge rectifier and MOSFET for shorts.
The high-frequency pulses pass through the transformer. This step steps down the voltage while providing a safety barrier between the "hot" AC side and the "cold" DC output side. 4. Secondary Rectification & Filtering wannien 101v0 power supply schematic exclusive
Over-voltage protection (OVP) and short-circuit protection (SCP). 🛠️ Decoding the Schematic: Main Sections
Power supply repair involves . The main 400V capacitor can hold a charge long after the device is unplugged. Always discharge the main capacitor using a discharge tool or a high-wattage resistor before touching the board. "Bulging" or leaking capacitors in this section cause
Low-ESR electrolytic capacitors smooth the ripples.
Metal Oxide Varistor (MOV), X-capacitors, and Common Mode Chokes. Goal: Convert AC to a "dirty" DC and filter out line noise. 2. The Primary Switching Stage This is the "heart" of the power supply. The high-frequency pulses pass through the transformer
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Understanding the is essential for technicians repairing modern LCD monitors and small electronics. While "exclusive" schematics are often guarded by manufacturers, most Wannien boards follow a standardized switch-mode power supply (SMPS) topology.
High-value resistors (around 100kΩ) near the PWM IC. If they go open-circuit, the board won't "start."