Backlight control circuit of lcd

A backlight control circuit comprising:

• a first load circuit comprising a first backlight and a first backlight inspecting circuit connected in series, the first inspecting circuit comprising a first output;
• a second load circuit comprising a second backlight and a second backlight inspecting circuit connected in series, the second inspecting circuit comprising a second output;
• a pulse width modulation integrated circuit (PWM IC) comprising a current sampling pin;
• a switching circuit comprising a first transistor, a second transistor, a first diode, and
• a first resistor, the first transistor having a base connected to a cathode of the first diode, an emitter connected to ground, and a collector connected to a power supply via the first resistor, the second transistor having a base connected to the collector of the first transistor, an emitter connected ground, and a collector connected to the current sampling pin of the PWM IC, and connected to ground via a capacitor, an anode of the first diode connected to the power supply;
• a first input circuit comprising a second diode, an anode of the second diode connected to the anode of the first diode, and a cathode of the second diode connected to the first output of the first load circuit;
• and
• a second input circuit comprising a third diode, an anode of the third diode connected to the anode of the first diode, and a cathode of the third diode connected to the second output of the second load circuit.