CHANGHONG is a well-known domestic home appliance brand, and all kinds of large and small home appliances are produced and sold. Recently, Charging Head Network purchased a 42-inch smart network TV 42P3F in Changhong, which has built-in 4K TV dedicated chip and stereo speakers, which will be very good for both visual and auditory experience. In addition, it also supports mobile games, movie wireless screen projection, etc., to further enhance the entertainment experience.
Of course, this time, this time, the built-in power supply of this TV is to disassemble. As a smart TV, I believe everyone is also curious about the internal design of this type of TV. Let’s take a look at how the built-in power supply of the TV is designed.
. Changhong TV 42P3F appearance
As a large piece, Changhong TV is packaged in common kraft paper boxes, with the words Changhong TV printed in the center, and the logo representing the "42-inch TV" composed of 42 and frames. The lower right corner is Changhong's "Let imagination happen" slogan, and the lower left corner is the logo.
The other side is the "CHANGHONG Changhong" brand, and the characters in the lower right corner are replaced with Changhong TV.
The inside of the box is surrounded by white foam protection TVs, and a red plastic bagged tripod is placed in a groove on the top.
In addition to the TV, there are these things inside, including a remote control, power cord, tripod, assembly screws and manual.
scene list, black shell and black screen, which is quite elegant and has a very simple style.
There is a CHANGHONG brand logo in the middle of the bottom border of the TV.
The back of the TV has a rounded edge transition, the power button is in the lower left corner, the center is raised to the interface function area, and a heat dissipation window is also provided.
Four screw holes are reserved on the raised shell. Users can choose to purchase wall mount BG13 to place the entire machine in a suitable position.
TV nameplate
Model: 42P3F
Rated voltage: 220V~
Power frequency: 50Hz
Rated power consumption: 70W
Manufactured by Sichuan Changhong Electric Co., Ltd., and the TV has passed HDMI certification and CCC certification.
side socket list, from top to bottom, are the 8-character power cord socket, USB2.0 interface, AV input interface (yellow, white and red), HDMI (2.0) interface, antenna input port, RJ45 network interface, and coaxial output interface.
Turn on the TV and there will be a user agreement and privacy policy interface for the user to operate.
After binding, enter the welcome interface.
Finally, there is a list of the menu interface.
2. Changhong TV 42P3F built-in power disassembly
Remove the raised shell, the internal PCB board is fixed to the metal backboard with screws, all functions of the TV are integrated on this circuit board, and the connected wires are plug-in and unplugged. The screen cable interface is below the circuit board, and the TV processor is under the black heat sink.
Unplug the wire, remove the screws and remove the circuit board without loss.
PCB board length was measured to be 173.46mm.
width is 170mm. The front of the PCB board is at a glance, and the upper left area is the high voltage side area of the TV built-in power supply, and the boundary is very obvious.
PCB board single-sided welding components, with a conductive cloth sticking on the back, and the corresponding area of the capacitor is hollowed out, so that the capacitor can be processed on the plate and reduce the height.
words input mother seat close-up, through hole welding. The three patch Y capacitors at the input end of
are all from Sichuan Teruixiang Technology Co., Ltd., with a fan-shaped layout, with small size and light weight, and are suitable for all kinds of AC-DC input power supply products.
Teruixiang focuses on the research and development, production and sales of passive components, with a registered capital of 100 million yuan.It has two categories of independent capacitor brands: SMD TRX and DIP TY capacitors. TRX will be committed to the research of ceramic materials to expand applications in more categories and provide customers with more solutions.
Charging Head Network learned that Teruixiang chip Y capacitors can also be used in the fast charging field, and have been used by dozens of high-power chargers such as GreenLink 3C1A 100W gallium nitride fast charging, Besie QC5 certified 100W gallium nitride fast charging, Maidoduo 100W gallium nitride, OPPO 65W super flash charging gallium nitride charger, Lenovo 90W gallium nitride fast charging, Nubia 65W gallium nitride charger, Besie 120W gallium nitride + silicon carbide PD fast charging charger and other high-power chargers, as well as mini fast charging from brands such as Nubia, Hailutong, First Wei, Belkin, etc., and have been unanimously recognized by customers.
fuse close-up, specification is 3.15A 250V.
NTC surge suppression resistor, suppressing power-on surge current. Close-up of
0U681K varistor, input overvoltage protection.
safety gauge X capacitance capacity 0.47μF.
common mode inductor close-up, flat copper strip wound, used to filter out EMI interference.
has an information label on the side.
YBS3010A rectifier bridge, set two to spread heat evenly.
red film capacitor close-up.
high voltage filtering electrolytic capacitor comes from Kingsoft, Taiwan, China, with a specification of 450V 82μF.
main control chip power supply capacitor comes from Dongjia Electronics, with a specification of 50V 10μF. These two capacitors are glued and reinforced. Next to the small capacitor is the PWM master control chip.
primary switch MOS tube adopts Dongwei OSG70R350DF, with a voltage withstand voltage of 750V, a resistance of 350mΩ, and a TO252 package.
Dongwei OSG70R350DF data information.
transformer wrapped in black tape insulation, and the top inkjet has information.
CT 817B Optocoupler, used to feedback the output voltage. There is also a Teruixiang patch Y capacitor next to
.
and a half MBRS10150CT Schottky diode, 10A150V withstand voltage, used for power output rectification.
and a half MBRS10150CT Detailed information.
Two output filter electrolytic capacitors come from Dongjia, and the specifications are 63V 100μF.
LED backlight boost inductor is also wrapped in black insulation tape.
New power NCEP1520K, withstand voltage 150V, NMOS, used for LED backlight boost.
New power NCEP1520K data information.
Yang Jie MBR10150CDS Schottky diode, 10A, withstand voltage 150V, used for backlight boost rectification.
Yang Jie MBR10150CDS data information.
A heat sink is pasted on another diode with thermal glue.
Jilin Huawei Fast Recovery Diode 10F40S3, 10A, withstand voltage of 400V.
Huawei 10F40S3 Detailed information.
output filtered electrolytic capacitor comes from SAMXON Sanxin, with a specification of 100V 47μF.
Anbao OB3350CP, a cost-effective LED dimming controller, combined with MOS tubes, Schottky diodes and inductors, is used for LED backlight boost drive for TV sets.
Anbao OB3350CP data information.
LED backlight slot close-up.
TI TPS563201 3A output synchronous rectifier buck converter, used for powering digital chips on TV, supports 4.5-17V input.
TI TPS563201 Detailed information.
TI TPS562201 2A output synchronous rectifier buck converter, powers the step-down of the TV digital circuit unit and supports 4.5-17V input voltage.
TI TPS562201 Detailed information.
Another TPS562201 step-down circuit.
Another TPS562201 step-down circuit.
R7 buck inductor.
three capacitors are all from Dongjia, and the specifications of the two large electrolytic capacitors are 25V and 470μF.
small capacitor specification is 10V 470μF.
China Resources Silicon Micro CS387BEO Stereo Class D amplifier, used for TV audio amplification.
wireless module uses REALTEK RTL3188GTV chip for wireless network connection of TV sets. Close-up of the female seat with a plastic shell supported below.
three AV input interfaces close-up. There is a filter capacitor behind
, with a specification of 16V 100μF, from Dongjia. Close-up of the
HDMI (2.0) interface mother seat, also supported by plastic shell.
antenna input port close-up.
RJ45 network interface close-up.
coaxial output interface close-up.
Charging head network disassembly summary
The circuit board of this Changhong TV is relatively simple to remove. The connecting wires are plug-in and unplugged, which is very convenient for assembly or later maintenance. Of course, this disassembly is just to share with you the basic design of today's smart TV. Please do not imitate and disassemble it privately, so as not to fail to warranty if your TV fails and causes unnecessary losses. Through disassembly, the charging head network has learned that the TV power supply structure is quite simple, the single-channel flyback architecture outputs backlight power supply and digital chip power supply, and the switching power supply output uses Schottky diode rectifier. The backlight power supply is controlled by the Angbao OB3350CP, and the digital processor is powered by multiple TI TPS562201 and one TPS563201 synchronous buck converter.
The TV motherboard integrates a WiFi module and a wired network interface to facilitate network connection. Digital signal processing and switching power supply are on a circuit board to reduce production costs.
