how to detect the LED emission tube?
how to detect the LED emission tube?
The use of multimeter to detect LED luminous platoon is mainly to check whether the LEDs are good.May be based on
Its structure is tested by different methods.
the vertical LED emission tube is placed in the vertical and reverse measurements of the multimeter in the RX10k2 gear.When the light emitting,the red pen is connected to the negative pole of the one pole,the black pen is connected to the positive pole of the one pole,and the multimeter pointer should swing greatly;the reverse resistance should be infinity when no light is light.Which one does not shine for which is bad.It can also be detected directly by battery.That is to say,using 3V battery string only a small resistance, we should see the luminescence when measuring
detection of common electrode LED light emitting tube for detecting common electrode LED luminous platoon is basically the same as that of detection and separation.For the common cathode,the cathode is connected to the cathode with the red pen,and the anode pins are measured sequentially.When normal,each tube should shine.The common anode is opposite. If there is no light,it can be judged to be a damaged part.For some dissimilar monitors with pin polarity, the above method can also be used to identify the structural type and the order of pins conveniently.
what is a flashing light emitting diode (BTS)?
The flicker LED is packaged by a block CMOS integrated circuit (IC) and a light-emitting diode. The block diagram of the LED is shown in Figure 5-16.CMOS IC includes oscillator divider and slow in driver.When the 3~5V DC power is connected to VoD,the oscillator starts to generate a high frequency oscillation signal,and a low frequency signal (a few Hz) is obtained by the frequency divider.Then the driver is driven to make the LED shine.The four colors are red,orange,yellow and green.With the attention of the light emitting diode,it is not allowed to add overvoltage,usually the fast working voltage of the scintillation light emitting diode is 3- 6V.using the positive.Negative polarity,no reverse,the tube is from the positive pole,the state is not too high at the temperature,the root is not allowed to bend,and the point is far from the point.Two tube body.