The secondary side of the transformer yields the stage. Here, the high-frequency AC is converted into specific DC rails—commonly 12V and 5V —to power the main logic board, tuner, and audio amplifiers. Precision is maintained through an optocoupler feedback loop, which bridges the "hot" and "cold" sides of the board to ensure voltage stability without compromising electrical isolation.
This is usually a backlight failure. Check the voltage at the LED connector (CN6). If the boost converter isn't jumping from ~24V to a higher voltage (e.g., 60V–100V), the driver IC or a LED strip is likely faulty.
This is the most critical section for troubleshooting. The schematic must detail the Independent Power Supply (IPS) structure.
: Utilizes the FAN6300 controller IC (U1) to drive the switching transistor (Q1) and transformer (TR1) for primary power conversion.