LED LCD TV Backlight Driven 14-37-inch Heightllow Poly Powder Common Modified Modified Back Light Plate

4. Common electronic symbol code Chinese and British comparison as follows: as follows: as follows:

A.VCC: Power supply voltage positive electrode, circuit power supply voltage (voltage is usually 12V or 24V))

B.On/OFF, on, EN, on_bl, etc.: The switching foot, the switch signal pin (the voltage range is usually between 2.5V-5V)

C.PWM, PDIM, VDAJ, BL-PWM, etc.: Brightness adjustment foot or shredded feet.(There are two modes of lighting, one is the digital mode-PWM (the voltage of the signal is usually 3.3V), and the other is to simulate the lighting-DC (the voltage of the signal is 0-3.3V/0-5V)

PWM is called pulse width adjustment. It produces a rectangular square wave signal. The frequency is generally 200Hz-2kHz. The voltage amplitude is usually 3.3V. PDIM is the abbreviation of English.The simulation lighting is performed by a DC voltage, which is usually the purpose of providing a 0V-5V DC voltage directly to control the brightness to control the brightness..

GND: Ground (Power negative pole)

LED+: Lighting diode (light strip) positive pole

LED-: Lighting diode (light strip) negative electrode

The above symbols contain most of the code on the LCD motherboard and the code on the backlight board. When connected, it is not wrong to be connected according to their respective code.

Common questions before buying:

Question 1: Can a constant current drive board be used for a television?

Answer: As long as the lamp bar operating voltage is below 80V, no matter how many inch of TVs are, this product can light up it.Note: What is said here is just lighting, not to be suitable.The best way to answer the exact answer is to provide the backlight module parameters of the panel (the working voltage of the light bar, the rated current, etc.), and if you can provide accurate data, we can achieve "private customization" services.
Then again, what if the lamp bar is not sure how voltage the lamp bar is?At this time, a very simple way is to find the duration of the output filter electrolytic capacitor of the output filter electrolytic capacitance on the original machine?If it is 100V to resist, it means that its light bar voltage will not exceed 80V, then my product can be clicked, just take a decisive photo.
After knowing that the voltage can be ordered, a problem needs to be noticed.The crystal size of LED lamp beads determines the rated current it needs, but because of various reasons, the module factory will use various specifications of lamp beads to cause various rated working currents.In order to solve this problem, we all use our standard parameters if it is a model of 26 inches or more: Hengliu 480mA, if it is below 24 inches, reduce the current to half, that is, 240mA.It is also necessary to explain the real problem here: 480mA is not a screen that is suitable for 26 inches, just choose a general value to be used to determine the accurate parameter.According to the data from many users before, it is appropriate to see that this current is used, but occasionally there will be too bright. At this timeAfter Vadj, you can darke the brightness.
The following is a baby function introduction:
Uses: 10-42 "LED TV backlight booster board.
Product features: Made by the original import plan of Taiwan, Boost structure, conversion efficiency of more than 92%, device heating low, stable product, a longer service life, small PCB volume, ultra -thin design, to meet the most harsh and thin requirements, accurate accurate requirements, accurate accurateThe current control error is within ± 5%. The flexible and convenient current adjustment design can easily match the screens of different manufacturers and models.Design meets EMC requirements and passes CE certification.High reliability, one year of warranty!You can use 12V power supply to reduce system cost!

This product is a constant stream, the focus is on the constant current, and the voltage is automatically adapted. The light string of the backlight module automatically adjusts the voltage.String = 64V, assuming that each string of LED current is 60mA. At this time, you only need to set the current to 240mA to click this screen.
The inductance of the magnetic ring of iron and silicon aluminum, higher temperature coefficient, higher magnetic saturation and higher stability performance.Because the system conversion efficiency is extremely high, the device is very low, and the temperature is controlled at about 25 ° C (explanation: temperature rise = device surface temperature-ambient temperature). When the component surface temperature is maximum 50 ° C (working conditions: working conditions: working conditions: working conditions: working conditions:Enter 24V, output 64V480mA))
Extreme parameters:
When entering at 24V: Vout = 75V IOUT = 720mA or maximum 60W
At 12V input: Vout = 75V iOUT = 400MA or maximum 30W

Extreme parameters refer to the maximum tolerance of the product product in the application process. In actual use, please use below the limit parameter to ensure the reliability of the product.

About installation issues
Question 1: Can't it light up?
1. Check if the polarity of the connection line is correct?Whether the LED positive and negative electrodes are correct.
2. Measure the power supply voltage, see if there is a voltage on the board, measure the LED+boosting voltage when the machine is turned on, it is generally higher than the VCC voltage.
3. If you do n’t have the voltage, please measure whether the ON foot is voltage. The normal voltage should be about 3.3V.
4. If the above situations are normal, measure the laben resistance between the LED-to the GND when the power is turned off. The normal should be a smaller resistance value, 2 ohm.
The above steps to verify that the rest is normal after it is normal. It may only be the problem of the LED light bar.
Question 2: The machine is bright, but the brightness is not enough?
First of all, the brightness is adjusted by remote control to the brightest. If you still measure the PDIM feet when you are not bright enough, if the voltage is always higher than 4V, you need to change the low voltage in other ways.At first, if the brightness can be satisfied, the brightness requirements can be achieved by changing the low -footed voltage.
If the brightness of the disconnecting foot is not enough, you need to increase the brightness in other ways.