Wannien 101v0 Power Supply Schematic Verified //free\\

Measure between the Drain, Source, and Gate pins. A low resistance or zero-ohm reading between any pins indicates a dead short.

Accurate identification of the IC regulator and switching transistors.

Small electrolytic capacitors on the primary auxiliary rail (often 10µF to 47µF, 50V) lose capacitance. The PWM IC starts using the trickling current from resistors, but cannot sustain operation because the auxiliary cap fails to hold a charge.

Look for bloated or leaked capacitors. Measure the input to the 5V regulator. Backlight Flashes and Dies: wannien 101v0 power supply schematic verified

What is your power supply displaying? (e.g., completely dead, stuck at max voltage, clicking relays)

Measure the secondary output diodes. Reverse polarity should read open; forward polarity should read roughly 0.2V to 0.4V for Schottky diodes. Step 3: Safe Live Testing (Using a Dim Bulb Tester)

The transformer (T1) is hardest to fake. On the schematic: Measure between the Drain, Source, and Gate pins

: The most frequent issue. Verified fixes involve replacing low-ESR electrolytic capacitors in the secondary stage, which often bulge or leak, causing "no power" or "two seconds to black" symptoms.

A blown fuse is the most common "no power" symptom. If it's blown, check the bridge rectifier for shorts before replacing it. Inspect Capacitors:

What (multimeter, soldering iron, dim-bulb tester) you have on hand? Small electrolytic capacitors on the primary auxiliary rail

Are you currently troubleshooting a on your Wannien board, or do you need help identifying a specific component part number from the schematic? Share public link

If the link is dead, use the in Section 6 – it will be 100% verified for your board.

This regulator is the core of the 5V rail. If the monitor shows no signs of life, the output of this regulator is the first point of failure. C. Transistor Switch Circuits