Check voltage at the backlight terminal. If it remains stuck at 12V, check the boost MOSFET and PWM driver IC. eMMC Flash / Core Rails
: Bridges the hot and cold split, monitoring the output voltage rails to adjust the PWM switching frequency, stabilizing the power delivery. 2. Cold-Side Voltage Rail Distribution
: A frequent problem where voltages may be present but the standby LED remains off, indicating a failure in the logic or standby power circuit. The tested LCD TV motherboard TP.MT5510I.PB805 works well