Supply Schematic Exclusive - Wannien 101v0 Power

In some cases, the transformer on the board fails to step up the voltage for the CCFL backlight, resulting in a dark screen. Diagnostic Steps with a Multimeter:

The PWM controller isn't starting up, or there is an open circuit in the power path. What to check: wannien 101v0 power supply schematic exclusive

The circuit begins where the AC mains enter the board. This section is designed to protect the power supply from line surges and to prevent the power supply's own high-frequency switching noise from leaking back into the grid. In some cases, the transformer on the board

On the schematic, locate the voltage divider at the feedback pin of the TL431 (IC3). In some cases