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Keyboard and IR Board for LED TV CKD Parts, Customized OEM ODM Solutions Offered

LED TV CKD Parts: Keyboard for TV remote

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Product Review:

Principle of remote control: the remote control mainly consists of a microprocessor chip, a crystal oscillator, a amplifying transistor, an infrared light-emitting diode and a keyboard matrix. It works as follows: the oscillator inside the microprocessor chip IC1 forms a high-frequency oscillator through the 2 and 3 pins and the external oscillating crystal X, generating a high-frequency oscillating signal (480kHz). After this signal is sent to the timing signal generator, sinusoidal signal and timing pulse signal of 40KHz are generated. The sinusoidal signal is sent to the coding modulator as a carrier signal. Timing pulse signal is sent to sweep signal generator, keying input encoder and instruction encoder as the time standard signals of these circuits. The internal scanning signal generator of IC1 generates five scanning pulse signals at different times, which are sent to the keyboard matrix circuit by 5-9 pin output. When a key is pressed, the control signal corresponding to the function key is input into the keying encoder by 10 ~ 14 pins respectively, and the digital signal of the corresponding function is output. Then the finger encoder outputs the command code signal, which is modulated by a modulator on the carrier signal to form a high-frequency pulse string containing functional information. The 17-pin output is amplified by the transistor BG to push the infrared led D to emit the pulse modulation signal.


We can offer all LED TV CKD Parts: Keyboard PCB, IR board PCB, LVDS, LED Backlight films. LED Bar, ect.

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