Technical description and composition of the DEXP F43B8000K TV, panel type and applicable modules. The composition of the modules.DEXP LED
Model: F43B8000K
Chassis / Version: 35020422
Panel: YTK0586
T-CON: 6870C-0532A
LED driver (backlight): integrated into PSU
PWM LED driver: AP3041M-G1
MOSFET LED driver: ME4N25
Power Supply (PSU): 35018645 KIP + L090E02C1-01
PWM Power: FAN6755, FAN7930
MOSFET Power: 12N50, 10N60L
MainBoard: 35020422 REV-01
IC MainBoard: CPU: MSD63691V, SPI FLASH: W25Q16, 25Q10
Tuner: NoName
Technical Specifications F43B8000K
DEXP F43B8000K
General repair guidelines for TV LCD LED
Possible malfunctions
- DEXP F43B8000K does not turn on and does not show any signs of performance at all. Does not blink indicators and does not respond to control buttons.
Often in such cases, the power supply module 35018645 turns out to be faulty. Then you should measure its output voltages and, in case of their complete or partial absence, it is necessary to check the serviceability of the power switches (12N50, 10N60L) and rectifier diodes of the converters for a possible short circuit.
In case of diode breakdowns in the secondary circuits, the converter can operate in emergency short-circuit mode without output voltages, and during short circuit in the power elements of the primary circuit, the mains fuse and / or current sensor at the source of the key usually breaks.
Mos-Fet power switches, used in switching power supplies, sometimes fail due to a malfunction of any other elements that can put it out of operation in key mode or create an excess of the maximum permissible parameters of the switch. These can be elements supplying the PWM controller, frequency-setting or damping circuits, or negative feedback elements in the stabilization circuit. PWM controllers FAN6755, FAN7930, in the absence of visible damage or frank short-circuit between the terminals, are checked by replacing with new, or obviously working.
- There is no image, there is sound, it responds to the remote control. Or the image may appear for a second when turned on and immediately disappears.
A malfunction is usually most likely in these cases at the backlight nodes of the display matrix. The reason for this may be a break in the LED circuit, or a problem in stabilizing their power supply.
To check the LED lines for breaks without disassembling the panel, for example, a current source will help. It is impossible to open series-connected PN junctions with a simple multimeter, a voltage of the order of several tens of volts is required.
- The TV does not enter the operating mode, does not respond to the remote control. The indicator on the front panel lights constantly or blinks.
Repair or diagnostics of the 35020422 motherboard should begin by checking the stabilizers and power converters needed to power the chips and matrix. If necessary, update or replace the software (software). Complex repair of MB (SSB) is possible only in the conditions of a service center with the necessary equipment. Checking or replacing CPU elements: MSD63691V, SPI FLASH: W25Q16, 25Q10 requires the necessary training and professional skills to repair modules at the component level. Problems associated with the use of BGA soldering technologies can sometimes be diagnosed by warming up.
If there is no reception of television channels, but the TV is working properly from external devices, first of all it is necessary to check the voltage of the NoName tuner and update the software. The pulses from the I2C bus must be controlled with an oscilloscope.
It should be remembered! Attempts to independently repair the DEXP F43B8000K TV, in the absence of the necessary qualifications and experience, are categorically not recommended and are fraught with negative consequences, up to the complete non-repairability of the device!
SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> 35018645 KIP+L090E02C1 Power supply.
FIRMWARE FOR SPI FLASH -----------> W25Q16, W25X10 DEXP F43B8000K, Main: 35020422 REV-01, Panel: YTK0586
The appearance of the MainBoard 35020422 is shown in the figure below:35020422
The appearance of the power supply
Main features of the DEXP F43B8000K device:
Installed matrix (LED-panel) YTK0586.
The matrix control uses the Timing Controller (T-CON) 6870C-0532A.
To power the backlight LEDs, a converter is used, combined with a power supply unit, controlled by the AP3041M-G1 PWM controller. As the power elements of the LED driver, keys of the ME4N25 type are used.
The necessary supply voltages for all nodes of the DEXP F43B8000K TV are generated by the power supply module 35018645, or its analogs using FAN6755, FAN7930 microcircuits and power switches of the 12N50, 10N60L type.
MainBoard - the main board (motherboard) is a module 35020422, using CPU chips: MSD63691V, SPI FLASH: W25Q16, 25Q10 and others.
The NoName tuner provides television reception and channel tuning.
DEXP F43B8000K TV with C430F14-E1-L LCD, 43 "(109 cm) diagonal size of 16: 9 format. The required screen brightness of 300 cd / m² is provided by LED backlighting. Contrast - the ratio of maximum brightness to minimum is 3000: 1. there are TV capabilities include watching programs and movies in high quality HD at a resolution of 1920x1080 pixels in a graphical decomposition standard 1080p (Full HD).
The F43B8000K is equipped with SMART software, embedded applications and the ability to work on the Internet. Connecting to the Internet can be done via Wi-Fi. The input high-frequency or video signal is decoded in analog systems PAL, SECAM, NTSC. Graphic processing and digital signal generation occurs in standards 480i, 480p, 576i, 576p, 720p, 1080i, 1080p. Supported media file formats: MP3, WMA, MPEG4, MKV, JPEG.
The power of the sound system 10 W (2x5 W) provides two speakers. The audio processing system NICAM STEREO is used.
The external interface (communication with other devices) is supported by standard input and output connectors: antenna input (RF), VGA, HDMI x4, USB x3, Ethernet (RJ-45), Wi-Fi. An output for connecting headphones is provided. To connect a computer or laptop to this TV model, a VGA (D-Sub 15) connector is used on the TV case, this interface supports resolutions: 640x480, 800x600, 1024x768, 1280x1024, 1360x768, 1920x1080. A digital tuner is capable of receiving television channels in the DVB-T MPEG4, DVB-C, DVB-T2 standards.
Overall dimensions: with stand 960x600x250 mm, without stand 960x580x45 mm.
TV Weight: with stand: 13.4 kg, without stand: 13 kg.
Attention! The C430F14-E1-L (LC430DUY) panel of the DEXP F43B8000K LED TV is an expensive and unreliable element.
Avoid any impact on the glass and pressure on the surface of the screen to avoid damage to the LED panel!
It is also unsafe to get liquid on the screen. Sometimes one drop is enough if it flows down the glass onto the cables so that the TV becomes unrepairable.