Ornate Pixels (Electronics)

TPS65178 or TPS65178A IC is fully programmable with DAC (Digital to Analog Converter). It can provide all bias voltages for TFT LCD TVs and monitor display panels. The TPS65178 IC features an internal 6-channel gamma buffer, VCOM reference, and dynamic gain control.

The TPS65178 IC has four synchronous buck converters, which precisely output the VCORE, HVDD, VEPI, and VCC voltages. Pins 11, 12, 13, and pin 14 of this IC are supplied with positive voltage (VIN) and separate filter capacitors. The VIN voltage range of the TPS65178 IC is 8.6 volts to 14.7 volts.

Now, let's look at the output voltages of  TPS65178 IC. The output range is slightly different for different sizes of TFT LCDs, as shown below:

Boost converter voltage VDD - 12 Volts to 19 Volts (6Bit)

Positive charge pump voltage VGH - 19 Volts to 34 Volts (4Bit)

Buck converter voltage VEPI - 0.9 Volts to 2.4 Volts (4 Bit)

Buck converter voltage VCORE - 0.9 Volts to 2.4 Volts (4 Bit)

Buck converter Voltage VCC - 3.0 Volts to 3.7 Volts (3 Bit)

Gamma voltages: What is the function of gamma voltage in LCD panel, what is the problem if gamma voltages are incorrect, and what is the gamma reference voltage with gamma output voltage? You can watch THIS VIDEO.

TPS65178 IC Schematic Circuit Diagram with Pinout

A schematic Circuit Diagram of  TPS65178 IC below shows the pinout and pin functions of the IC, so the datasheet PDF of TPS65178 IC is not published separately on this page.

TPS65178 is a programmable IC. All output voltages and currents of this IC are determined by I²C programming.

What is I2C  Programming

I²C  programming establishes communication between the microcontroller and peripheral devices by sending and receiving data over two wires (SDA and SCL). It ensures initialization, addressing, and correct start and stop conditions. It provides data transfer between connected devices.

Observe the circuit diagram of the TPS65175 IC. The pin-27 of the IC is SDA, and data is input and output through this pin. Pin-28 is SCL. The clock pulse is transferred through this pin. These two pins are connected to the SDA and SCL pins of the two T-Con memory ICs. Watch THIS VIDEO to learn how to do I2C programming in memory IC.

TPS65178 IC Schematic Circuit Diagram and Pinout

Components List and its value of TPS65178 IC Circuit Diagram:

Value of Transistors:

Q1- MMBT2907ALT1, Q2- MMBT2222A

Value of Inductors:

L1- 10µH, L2- 6.8µH, L3- 10µH, L4 2.2µH, L5- 2.2µH

Value of Diodes:

D1- SL22, D2- SL22, D3- BAT54S, D4- BAT54S, D5- BAT54S, D6- BAT54S

Value of Resistors:

R1- 33KΩ, R2- 2.2KΩ R3- 2.2KΩ,  R4- 10KΩ, R5- 47KΩ, R6- 120KΩ, R7- 100KΩ, R8- 100KΩ

Value of Capacitors:

C1- 10µF, C2- 10µF, C3- 10µF, C4- 10µF,  C5- 10µF, C6- 10µF, C7- 10µF, C8- 1µF, C9- 0.1µF, C10- 10µF, C11- 1µF, C12- 10µF, C13- 10µF, C14 and C15- 10µF, C16-C17-C18-C19- 10µF, C20- 4.7µF, C21- 4.7µF, C22- 0.22µF, C23- 0.1µF, C24- 4.7µF, C25- 0.1µF, C28- 0.22µF, C29- 4.7µF.

Content of this page-

• TP.V56.PA671 Service menu code.

• TP.V56.PA671 Resolution codes.

• TP.V56.PA671 Firmware (software).

• No Power Solution of TP.V56.PA671 LED TV Board.

TP.VA56.PA671 LCD TV combo board is outputting 12 volts properly from SMPS, but the power indicator light is not flashing. TV does not turn on when trying to turn it on by remote or key. In this situation, in some cases, by checking all the voltages of the TP.V56-PA671 circuit board, it can be seen that there is no voltage supply problem, but the TV is not working. In a word, all semiconductor devices and pre-regulator ICs and transistors on the circuit board of the TV are working correctly, but the power light is not turning on.

Not only in TP.V56.PA671 combo board, but in any brand of main board, this kind of problem can occur, and to know why such a problem arises, one must have explicit knowledge about the operating system of an LCD TV.

The motherboard of an LCD TV is precisely like a computer. This board contains input and output devices like a computer. LCD TV display is the output device. And the LCD TV remote and switchboard work like a computer keyboard.

LCD TV includes a processor, RAM, and graphics processor. The 25Q32CSIG memory IC works as RAM, with a storage capacity of 32 kilobytes. The TSUMV56RUU-Z1 IC contains the processor that controls the operating system of the LCD TV. Moreover, the graphics T-Con processor is controlled by the TSUMV56RUU-Z1 IC.

Now, let's come to the real point. The main topic of this article is the power supply of the TP.VA56.PA671 LCD TV board is fine, but the power indicator light is not flashing, and the TV does not turn on when you try to turn it on. Now, we try to understand why such problems occur.

TSUMV56RUU-Z1 processor IC is a component of digital electronics. Its function is signal processing and system control. A 24 MHz clock signal controls the input and output signals and voltages of this IC.

TP.V56.PA671 LCD TV Combo Board No Power Solution

(You can watch this VIDEO to solve the no-power problem of TP.VA56.PA671 LED TV Board)

The power indicator light is connected to the TP.V56.PA671 LCD TV motherboard does not flash due to various reasons. First, check the 12 supply on the board. Then, if the voltages shown in the image below are incorrect, the pre-regulator IC and transistor may be damaged.

The TP.VA56.PA671 board contains a 24 MHz SMD (Surface Mount Device) crystal oscillator to generate the constant clock signal. Two terminals of this crystal oscillator are connected to the ground with two 18pF capacitors.

Standby Voltage of TP.V56.PA671 LCD TV Mainboard

Both capacitors are sometimes damaged or shorted, resulting in the circuit stopping to produce the clock signal or changing the clock frequency. If this happens, the power indicator light of the LCD TV will not flash, and the TV will not turn on. In this case, changing the two 18pF capacitors can solve the problem of the LCD TV power indicator light not flashing.

TP.V56.PA671 Service Menu Code, Resolution Code, and Firmware 

The TP.V56.PA671 LCD TV board can drive LCD/LED displays with resolutions of 1366X768 pixels and 1920x180 pixels. Below is the firmware/software, service menu code, and resolution code of TP.V56.PA671 combo board.

Service Menu Code or factory setting code - Input 208

 TP.V56.PA671 Resolution Code -

Resolution 1366X768 - 81331,

Resolution 1920X1080 - 81332

TP.V56.PA671 Firmware (Software)- Download

RT6908 IC Circuit Diagram:

Application - TFT LCD Panel

This page publishes the schematic circuit diagram, pinout datasheet, voltage details, and all information about the RT6908 IC without PDF. Programmable RT6908 is a unique IC for power solutions of specific TFT LCD panels. The IC is built in the Quad Flat No-Lead (WQFN) package. Its terminal number is 40. The input voltage range of this IC is 9 volts to 16 volts.

RT6908 is a boost and buck converter IC with high current output capability; that's why it is a unique IC for power management of large-screen LCD TVs and monitor panels.

RT6908 IC Input and Output Voltage Details:

Vin: The input or operating voltage is 9 volts to 16 volts, as per the requirement of LCD panels.

AVDD: For most LCD panels, the AVDD voltage is 15.6 volts. VGH- 35.5 Volts. VI/O: 3.3 Volts.

VGL:  -6 Volts, Vcore: 1.1 Volts.

RT6908 IC Schematic Circuit Diagram and Pinout

Many of you have asked me for the schematic circuit diagram of the RT6908 IC and its datasheet in the comment section of YouTube videos and through Facebook messages. I have designed the circuit diagram to your requirements and published it here. The pin configuration or pinout of the RT6908 IC is randomly shown in the circuit diagram itself. Moreover, the values ​​of the components are mentioned below the circuit diagram.

RT9955 IC Schematic Circuit Diagram and pinout as Datasheet

RT6908 IC Circuit Diagram and pinout

Components List and its values of RT6908 IC

Capacitors:

C1- 22µF, C2- 10µF, C3- 2.2nF, C4- 4.7nF, C5- 120µF, C6- 1µF, C7- 1µF, C8- 10µF, C9- 1µF, C10-47nF, C11- 0.1µF, C12-100pF, C13- 22µF, C14- 0.22µF, C15- 0.1µF, C16- 0.22µF, C17- 22nF, C18- 10µF, C19-  , C20- 0.22µF, C21- 10µF, C22- 1nF, C23- 470pF, C24- 22µF, C25- 1µF, C26- 10pF, C26- 10pF, C27- 47nF, C28- 0.22µF, C29- 10µF.

Resistors:

R1- 100KΩ, R2- 47KΩ, R3- 15KΩ, R4- 120KΩ, R5- 1.8KΩ, R6- 1.8KΩ, R7- 6.8Ω, R8- 6.8Ω, R9- 6.8Ω, R10- 6.8Ω,  R10 for Gate of Q3- 20KΩ, R11- 10KΩ, R12- 24KΩ, R13- 1.5Ω, R14- 1.2KΩ, R15-   R16- 4.7KΩ, R17- 4.7KΩ, R18-4.7KΩ, R19- 100KΩ, R20- 6.8Ω, R21- 6.8Ω, R22-  R23- 24KΩ, R24- 33KΩ, R25- 47KΩ, R26- 15KΩ.

Inductors:

L1- 6.8µH, L2- 10µH, L3- 4.7µH.

Equivalent or substitute for RT6908 IC

I am collecting information about which IC can be used instead of RT6908 IC among LCD panels of different companies, so I will publish here as soon as possible what the alternative for RT6908 IC is.

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.

[ Schematic Circuit Diagram of  RT6908 IC ]

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.