A PWM (Pulse Width Modulation) controller chip drives a MOSFET to "switch" the DC voltage across a transformer at high frequencies.
Works with the optocoupler to monitor output precision. 3. Verified Troubleshooting Steps
Measure the output pins. If you have 0V, check the startup resistor (usually a high-value resistor near the PWM IC) which provides the initial "kick" to start the switching process.
Test the main input fuse for continuity. If it's blown, check the bridge rectifier and MOSFET for shorts before replacing it.
Usually mounted on a heatsink. Check for shorts between the Drain and Source pins.
If your device isn't powering on, follow these steps to diagnose the Wannien 101V0 board:
Includes the AC socket, fuse, and an EMI filter to reduce electrical noise.
Often an 8-pin IC (like the LD75xx series). If this fails, the board will appear completely dead.
The Wannien 101V0 typically operates as a . It takes a high-voltage AC input and converts it into stable DC output voltages (commonly 12V and 5V) to power the logic board and backlight of a display.
If the output voltage is "pumping" (fluctuating rapidly), the issue is often a faulty optocoupler or a dried-out capacitor on the PWM controller's VCC pin. 4. Safety Warning
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Wannien 101v0 Power Supply Schematic Verified ^hot^ May 2026
A PWM (Pulse Width Modulation) controller chip drives a MOSFET to "switch" the DC voltage across a transformer at high frequencies.
Works with the optocoupler to monitor output precision. 3. Verified Troubleshooting Steps
Measure the output pins. If you have 0V, check the startup resistor (usually a high-value resistor near the PWM IC) which provides the initial "kick" to start the switching process.
Test the main input fuse for continuity. If it's blown, check the bridge rectifier and MOSFET for shorts before replacing it.
Usually mounted on a heatsink. Check for shorts between the Drain and Source pins.
If your device isn't powering on, follow these steps to diagnose the Wannien 101V0 board:
Includes the AC socket, fuse, and an EMI filter to reduce electrical noise.
Often an 8-pin IC (like the LD75xx series). If this fails, the board will appear completely dead.
The Wannien 101V0 typically operates as a . It takes a high-voltage AC input and converts it into stable DC output voltages (commonly 12V and 5V) to power the logic board and backlight of a display.
If the output voltage is "pumping" (fluctuating rapidly), the issue is often a faulty optocoupler or a dried-out capacitor on the PWM controller's VCC pin. 4. Safety Warning