Ornate Pixels (Electronics)

i8973 IC used in MT3151A05-5-XC-5 LCD TV panel. Many of you have asked me for the schematic circuit diagram and datasheet of i8973 IC through Facebook e-mail and YouTube comments; I have searched the internet many times for the pdf datasheet circuit diagram of i8973 IC, and finally, I found several T-con boards of LCD panel. I saw that the circuit of i8973 IC is precisely similar to the circuit of an IC of a different number. Then, I did a lot of testing and was sure it was a substitute IC for the i8973 IC. Then, I collected the datasheet of that IC and designed the schematic circuit diagram of the i8973 IC for you.

i8973 is a Quad Flat No lid Packeg IC. The number of connecting terminals at the bottom of this IC is 10X4=40. This IC includes overload, short circuit, and thermal protection circuits, so it has a long life and usually does not damage.

The i8973 IC contains a microcontroller section, EEPROM, digital-to-analogue converter (DAC), and I2C interface for perfect performance. This IC is controlled by data and clock pulses, which perform excellent power management and signal processing of the LCD panel.

Internal Feature of i8973 IC

• Operating voltage (VIN) - DC 8V to 14V

• Positive boost Regulator for AVDD 13.5V to 19.5 programmable output.

• Buck regulator for 2.2 to 3.7 Volts (The circuit diagram is shown as VI/O or voltage input/output).

• Positive boost voltage regulator for VGH 20V to 40V, it is also programmable.

• Switching frequency - 750KHz, which is fixed.

• Negative charge pump regulator for VGL -4.5V to -13V operated by programmable system.

• VGH temperature compensation.

• Internal 20V OPAMP with +/- 300mA short current for output.

i8973 IC Circuit Diagram Pinout Data and Voltage Details

Below is the schematic circuit diagram of the i8973 IC, pinout, input-output voltage details, and information on the equivalent IC of the i8973 IC.

i8973 IC Circuit Diagram Pinout Data

I designed this circuit diagram recalling the T-con or scalar board, where L-1 had a value of 100µH, and L-2 had a value of 4.7µH.

List of components of i8973 IC circuit and their values.

Capacitor:  C1- 22µfd, C2- 1µfd, C3- 1µfd, C4- 10µfd, C5 C6 C7 C8- 10µfd, C9- 1µfd, C10- 10µfd, C110.1µfd, C12- 10µfd, C13- 10µfd, C14- 10µfd, C15- 0.47µfd, C16- 10µfd, C17- 0.22µfd, C18- 1µfd, C19- 0.22µfd, C20- 1µfd, C21- 10µfd, CCO- 470pf.

Resistor: R1 R2- 47.7KΩ, R3- 2.2Ω, R4- 10KΩ, R5- 10KΩ, R6- 2.2Ω, R7- 1KΩ, RCO- 75KΩ, RTC1- 51KΩ, RTC2- 22KΩ, RNTC- NCP18XH103F03RB.

Input and Output Voltage of i8973 IC Circuit Board

What is the equivalent IC of i8973

The equivalent or substitute IC for i8973 IC is CS902-A-R IC. By closely observing the two LCD scalar boards using these two ICs, it is found that the two circuits are very similar, so instead of the i8973, the CS902-A-R IC can be used in LCD TVs or Monitor display panels.

Special note: I noticed many people search Google by typing '18973 IC' to find the datasheet pdf of the i8983 IC.

The TDA2050 IC is reasonably sufficient to build an excellent performance audio amplifier for home use or sale at a low cost. The TDA2050 IC is an operational amplifier with high current flow capability. Twenty transistors are inside the IC or internal circuit for very low-distortion sound output.

The TDA2050 IC can sound output 50 watts according to IEC268.3 music power rules or audio power measurement techniques. This IC's True RMS power output is a maximum of 35 watts in an 8-ohm speaker load and can deliver 50 watts into a 4-ohm load.

The internal circuit of the TDA2050 IC is designed and constructed in such a technical manner that results in the following advantages:

• Low harmonic distortion
• Low crossover distortion
• Thermal shutdown protection
• Short Circuit protection
• 100 Hz to 15 kHz Audio Frequency coverage
• High operating voltage for bass boost benefits

I have purchased several TDA2050 IC amplifier boards from the market many times, but due to some technical mistakes in their PCB design, distortion, humming, and noise have been observed with the sound, but they have yet to make any mistake in the circuit. However, if you build a single or dual-power audio amplifier with this IC, I've outlined how to solve the audio distortion problem below.

TDA2050 IC Single Power Audio Amplifier Schematic Circuit Diagram

Capacitors and Resistors values ​​of TDA2050 IC circuit diagram (Single Power)

R1 - 2.2Ω - 2Watt. R2 - 22KΩ. R3 - 680Ω. R4,R5,R6 - 22KΩ.
C1 - 1000µF. C2 - 0.47µF (474), C3 - 22µF, C4 - C4 - 1000µF, C5 - 0.1µF (104), C6 - 47µF, C7 - 2.2µF. C8 - 1000 PF (102)

TDA2050 IC Circuit Diagram Dial and Single power

Part 2 in the figure above is the dual-power audio amplifier schematic circuit diagram of the TDA2050 IC. The wiring technique of the amplifier board will be similar to that of the single power circuit, which we have discussed in the above paragraph.

The power supply of the TDA2050 IC dual power audio amplifier circuit board should be a minimum of DC 12-0-12 volts and a maximum of DC 22-0-22 volts. TDA2050 IC will be durable if the secondary power transformer is AC 18-0-18 volts for maximum voltage application; that's from my experience.

Components Value of TDA2050 IC Dual Power Audio Amplifier Circuit Diagram

Main Filter Capacitor of Bridge Rectifier Circuit: FC1 and FC2 is 4700µF 50V.
C3, C4 - 1000µF. C5, C6 - 0.1µF (104). C7 - 2.2µF
R1 - 2.2Ω -2Watt. R2, R3 - 22KΩ, R4 - 1.5KΩ, R5 - 680Ω.

How to solve noise or humming sound problems in the TDA2050 IC amplifier

Generally, any audio amplifier has four sections: audio input section, audio driver section, feedback section, and audio output section. From this to the ground area of ​​the audio output section, some harmonic signal from the audio output gets mixed with the ground. As a result, the ground or negative supply is not pure DC, so noise or humming is produced with the sound output. That is why the distance between the ground print of the audio output and the input section should be kept while designing the PCB.

If you install the circuit board in a metal cabinet, solder one wire of the GND2 connection of the TDA2050 circuit board to the very front of the cabinet and the other GNDs to the back of the cabinet. Moreover, if there is humming with the audio sound, the filter capacitors should be checked.

How to fix TDA2050 IC overheating

The TDA2050 IC has a power dissipation of 25 watts, so if the voltage limit is exceeded, the IC will heat up due to excess current flow. A maximum AC 18-0-18 volt transformer for dual power amplifiers is best in this case.

TDA2050 Subwoofer Circuit Diagram

If you build a subwoofer amplifier circuit with TDA2050 IC, the heavy sound bits of low audio bass boost frequency will be exciting. In the next post, I will publish my tested and modified TDA2050 subwoofer circuit diagram.

Super AMOLED Display

The Super AMOLED Display is a product of Samsung Display Technology. What is a Super AMOLED display? What is the full form of the AMOLED? What are the advantages and disadvantages of Super AMOLED? What are its pros and cons? This article discusses whether this display is harmful or tolerable for the eyes. Moreover, we can learn how the Super AMOLED display works.

What is a Super AMOLED Display

The Super AMOLE display is a 'Super Active Matrix Organic Light Emitting Diode' display. To understand the matter more clearly, let's define matrix and organic. In this case, the matrix organizes many LEDs in columns and rows in a rectangular shape.

See the figure below: Red, Blue, and Green LEDs are arranged in columns and rows in the organic LED substrate, which is the LED matrix. Now, the question is, what is the active matrix?

A Super AMOLED Display does not need any additional backlight; active matrix LEDs are the light sources themselves, which is why this LED matrix is called an active matrix,

Super AMOLED Display Internal Structure

SM4151 IC schematic circuit diagram datasheet and Pinout. This IC is used for all power management of LCD panels, in which DC-to-DC converter and level shifter circuits are integrated.

This IC does not have pins; it has 48 terminals in the QFN package. Moreover, the SM4151 IC has a metal pad at the bottom, which is connected to the ground and acts as a heat sink.

SM4151 IC Schematic Circuit Diagram

The circuit diagram of the SM4151 IC is published below; from pin (terminal) 30 to pin 36 of the IC, six CKV, and STV are output from these six pins.

Moreover, the SM4151 IC has three voltage boost converters, from which the AVDD, VON, and HVDD boost voltages are output, and the VSS and VOFF voltages are output from the buck converters belonging to this IC.

The LCD panel of Sony Bravia Smart TV is installed with SM4151 IC, which is used in DC-to-DC converter and logic level shifter circuits.

The operating voltage of the SM4151 IC ranges from 9.5 volts to 14 volts. Because this IC can be damaged if a short circuit occurs in the LCD panel, it has a system of short circuit protection, overload protection, and thermal protection.

SM4151 IC Circuit Diagram

SM4151 IC Schematic Circuit Diagram & Pinout Data

Output and Input Voltages of SM4151 IC Circuit

VIN +12 Volts, VLOGIC (VCC) +3.3 Volts, AVDD +15 Volts, VON +28 Volts, VSS-6.5 Volts, VOFF -12 Volts. VCOM +7 Volts, CVO +7 Volts.

SM4151 IC Equivalent or Substitution

I noticed no difference between the circuit diagram of SM4151 IC and RT6906B IC; the operating voltage and output voltage of both ICs are the same.

Moreover, the pin configuration and package type of SM4151 IC and RT6906 IC are the same. So, RT6906 IC is the substitute or equivalent of SM4151 IC.

SM4151 IC Datasheet Pinout PDF

The SM4151 IC datasheet and pinout are not published on this page in PDF format, but the circuit diagram of the SM4151 IC above shows the pinout data and pin configuration.

What are AVDD, STV, VGH, VCOM, VGL, and CKV, and their functions? To understand these things, you need to know some basics of LCD panels first. We try to understand those aspects of the LCD panel. A tiny liquid crystal cell is below the RGB subpixels of the LCD panel and above the backlight (Look at the diagram).

When these crystal cells are energized, the molecular position of the Liquid crystal changes, and when De-energized, the molecules return to their normal orientation. During this process, the crystal cells act as a light barrier. When the crystal cells become entirely black, the backlight's light cannot reach the bottom of the pixels. Thus, the liquid crystals block the light waves and control the brightness of the pixels by opening the light path as needed.

This liquid crystal cell has two electrodes, one of which supplies a negative voltage VCOM, the positive voltage is provided to the other terminal by the source terminal of the thin film transistor (TFT), and the AVDD voltage is supplied to the drain of this TFT. Moreover, VGH or VGL voltage is provided to the gate terminal of the TFT at a specific time to make each TFT active, semi-active, inactive, etc.

What is AVDD, & what is its function in LCD and LED Display

AVDD stands for Analog Voltage for Drain-to-Drain, which some call an Analog power supply. Other names of AVDD are VDDA, HVAA, VSA. Each subpixel of the LCD receives a polarized light wave from the backlight, and there is a liquid crystal cell between the backlight and the subpixel to control the polarized light.

What is VGH, STV, AVDD, VGL, VCOM in LCD or LED TV or Monitor

To control the brightness of the sub-pixels according to the screen image, it is necessary to supply variable voltage to the two electrodes of this liquid crystal cell. A negative voltage is supplied to one electrode of the liquid crystal cell, and a positive voltage is provided to the other electrode by the source terminal of a thin film transistor. AVDD is supplied to the drain terminal of that TFT.

What is VGH in LCD, and what is its function?

The VGH is the acronym for Voltage High Gate, which is the boost voltage generated from the DC-to-DC converter. Its other name is VON / VGON/ VDDG. The VGH circuit in LCD has 20V to 33V and requires a 50mA current. An LCD panel comprises liquid crystal cells associated with thin-film transistors (TFTs).

These TFTs are responsible for adequately controlling the activity of the liquid crystal cells. To operate the TFT, a reverse bias voltage is applied to its gate terminal through gate COF; the source of that reverse bias voltage is VGH or High Gate Voltage.

What is VGL, and what is its function?

The full form of VGL is a voltage high gate, which is the minus voltage generated by the DC-to-DC buck converter. Other names for VGL are VOFF, VGOFF, and VEEG. The voltage range of VGL is -5 volts to -10 volts, and the current is 100mA.

In an LCD (Liquid Crystal Display) panel, VGL which stands for "Voltage Gate Low," is a voltage used to control the operation of thin-film transistors (TFTs) in the display. The TFTs are an essential component of an LCD panel as they act as individual pixel switches, allowing or blocking the passage of light through each pixel. VGL is responsible for controlling the "gate" of these transistors.

What is a AAA Super AMOLED Display? BBB

What is VCOM, and what is its function in LCD/LED Display?

VCOM is the Common reference voltage for each sub-pixel of the LCD panel. A tiny liquid crystal cell is placed under each subpixel to make the pixels of the LCD panel active or bright and dim. The number of these liquid crystal cells is several billion in an LCD.

Each liquid crystal cell has two electrodes; if we call one of these electrodes a cathode and the other an anode, positive voltage is supplied to the anode, and negative voltage is provided to the cathode. In this case, the cathodes of all the crystal cells of the LCD are connected by a conductive print, and a negative voltage is supplied.

Then, surely, we understood that the cathode terminals of the liquid crystal cell are marked as Common. VCOM, or Common voltage, is applied to these Common terminals. VCOM stands for Common Voltage, which is through which liquid crystal cells receive negative voltage.

What is STV in the concept of LCD?

STV is a Vertical Sync Input pulse. It determines the time to produce the next frame after a one-frame scan to make the image. When the rising edge of STV occurs, it marks the beginning of a data frame. The STV input is also used to generate the high-voltage STV or Start Pulse Output.

This high-voltage output is low (connected to VGL) whenever STV is low, and it becomes high (connected to VGH) only when STV is high and both CPV and OE are low.
What is CKV, and what is its function? Click here