What does ADJ mean on the LCD TV power board?

This is the backlight adjustment of LCD TV, and the working principle of A-DIM is voltage adjustment. ADJ and BK on the LCD power panel respectively indicate that ADJ is a signal with a brightness level of 0-3v, and BK backlight is turned on, which is usually 0V in standby and 3v in startup.

Adj constant is next to the adjustable resistor, which is an adjusting terminal and is usually used to adjust the internal current to change the brightness of LED. The names of circuit boards include: circuit board, PCB board, aluminum substrate, high-frequency board, thick copper plate, impedance board, PCB, ultra-thin circuit board, printed (copper etching technology) circuit board, etc. The circuit board makes the circuit miniaturized and intuitive, which is very important for fixing the circuit.

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Precautions:

Most power boards will output three sets of voltages: +5V for standby CPU,+12V for motherboard and +24V for backlight. Some high-power power power boards will output an extra set of+18V for audio power amplifier module. Generally speaking, as long as the output voltage of the power boards is the same, the power difference is not big, and the pins of the socket correspond (the arrangement order of the pins can be changed), the power boards can replace each other.

No matter which manufacturer produces the power board, as long as the output power reaches or even exceeds the power of the replacement product, the backlight circuit, motherboard and screen circuit of the whole machine can work normally. However, the replacement of the power supply assembly should also consider whether the fixed position of the power supply assembly matches the position of the original power supply assembly, otherwise it cannot be installed and fixed. Therefore, when replacing the LCD TV power module, we need to pay attention to the difference of the model, output voltage and current of the power module and the fixed position of the power module screws.

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