: The board features a primary rectification stage, a PWM controller (often similar to the TL494 or NCP1203 ), high-voltage electrolytic capacitors, and switching transistors mounted on heat sinks. Troubleshooting with a Verified Approach
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Measure between pin 4 (GND) and pin 7 (Vcc) of the LM324. You should see between 10V and 15V DC. If this voltage is missing or oscillating, nothing else will work. : The board features a primary rectification stage,
The Wannien 101V0 schematic represents a standard, "tried-and-true" approach to low-power switch-mode power supply design. Its verification confirms that it adheres to typical industry practices for Class II power supplies, utilizing a simplified component count to achieve stable DC output with standard safety protections. If this voltage is missing or oscillating, nothing