Technical description and composition of the DEXP F43D8000K TV, panel type and applicable modules. The composition of the modules.DEXP LED
Model: F43D8000K
Chassis / Version: 35023015
Panel: LC430DUY (SH) (A1)
LED backlight: JL.D43081330-083CS-M
T-CON: 6870C-0532A (6871L-3806B)
LED driver (backlight): integrated into MainBoard
Power Supply (PSU): integrated into MainBoard
PWM Power: PWM SOT23-6
MOSFET Power: CS13J65
MainBoard: 35023015 2017-12-18 REV-01
Tuner: CDT-9NS161-AV02
Technical Specifications F43D8000K
DEXP F43D8000K
General repair guidelines for TV LCD LED
Possible malfunctions
- DEXP F43D8000K 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.
The malfunction in such cases should be sought in the elements of the power source - the mains voltage converter (AC / DC), which is located on the MainBoard 35023015 main board. It is necessary to measure the output voltages in its secondary circuits, and if they are completely absent, check the correctness of the power switches ( CS13J65) and rectifier diodes for possible breakdown (short circuit).
In case of any breakdown of semiconductors in the secondary circuits, the converter can usually work normally in emergency short circuit mode. There are no output voltages. And with a short circuit in the power elements of the primary circuit, as a rule, the mains fuse breaks and less often the current sensor at the source of the key.
Breakdown of power switches (MosFet) in pulsed sources is sometimes caused by malfunctions of other circuit elements, for example, in circuits supplying a PWM controller, frequency-setting or damper ones, as well as in negative feedback (OOS) stabilization circuits. PWM controllers (PWM) PWM SOT23-6, if they do not have visible damage to the case and open short circuit between the terminals, are usually checked by replacement.
- There is no image, there is sound, it responds to the remote control, the channels are switched. In some cases, the image appears when you turn on and immediately disappears.
In some of these cases, the malfunction is caused by a lack of backlighting on the display. The reason for this may be a break in the LED circuit, or a problem in stabilizing their power supply.
It is impossible to detect a break in the LED line without disassembling the panel with a simple multimeter. The LEDs are connected in series and to open their transitions, a voltage of several tens of volts is required. Ideally, a current source is suitable for such purposes. You can open the panel and check each LED separately. Typically, Chinese multimeters light up a single 3-volt LED, if you connect the probes in the forward direction to it (red probe to the anode, black to the cathode). In dual 6-volt LEDs, the PN junction of its emergency zener diode can serve as an indicator of health. In the event of a LED malfunction, its zener diode will either be cut off or broken into short-circuit.
- The TV does not turn on, the indicator indicates standby or operating mode, or blinks.
Repair or diagnostics of the 35023015 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).
The malfunction of the tuner CDT-9NS161-AV02 is established after checking the software and all the supply voltages at its terminals. The data exchange of the tuner with the processor via the I2C bus can be controlled by an oscilloscope.
Attention to users! Self-repair of a DEXP F43D8000K TV without the appropriate qualifications and the necessary experience can lead to its complete non-repairability!
The appearance of the MainBoard 35023015 is shown in the figure below:35023015
Main features of the DEXP F43D8000K device:
Installed matrix (LED-panel) LC430DUY (SH) (A1).
The matrix control uses the Timing Controller (T-CON) 6870C-0532A.
To power the backlight LEDs, a converter is used, combined with the main board 35023015.
The power module is combined with the MainBoard and is designed according to a flyback AC / DC voltage converter using PWM SOT23-6 microcircuits and power switches of the CS13J65 type.
MainBoard - the main board (motherboard) is a module 35023015.
The tuner CDT-9NS161-AV02 provides reception of television programs and tuning to channels.
The DEXP F43D8000K TV with an LCD display LC430DUY, diagonal size 42.5 "(108 cm) in 16: 9 format. The required brightness of the screen is 220 cd / m² LED backlight LED. Contrast - the ratio of maximum brightness to minimum is 1200: 1. TVs provide for watching programs and movies in high quality HD at a resolution of 1920x1080 pixels in a graphical decomposition according to the standard 1080p (Full HD).
F43D8000K has built-in SMART Software and pre-installed Android Operating System. Connecting to the Internet can be done via Wi-Fi. Supported media file formats: MP3, MPEG4, HEVC (H.265), MKV, JPEG.
The power of the sound system 10 W (2x5 W) provide two speakers. It uses a NICAM stereo signal processing system and Sound Surround.
The external interface (communication with other devices) is supported by standard input and output connectors: antenna input (RF), AV, component, VGA, HDMI x3, USB x2, Ethernet (RJ-45), Wi-Fi. An output for connecting headphones is provided. A digital tuner is capable of receiving television channels in the DVB-T MPEG4, DVB-C, DVB-T2 standards.
Overall dimensions: with stand 971x609x209 mm, without stand 971x566x89 mm.
TV mass: with stand: 7.1 kg, without stand: 7 kg.
Attention! The LC430DUY (SH) (A1) panel of a DEXP F43D8000K 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.