Technical description and composition of the DEXP F43D7000K TV, panel type and applicable modules. The composition of the modules.DEXP LED
Model: F43D7000K
Chassis / Version: TP.MS3663S.PB801
Panel: LC430DUY (SH) (A1)
LED backlight: Direct LED
T-CON: 6870C-0532A
LED driver (backlight): integrated into MainBoard
PWM LED driver: 8pin
MOSFET LED driver: TO-252
Power Supply (PSU): integrated into MainBoard
PWM Power: PWM SOT23-6
MOSFET Power: TO-252
MainBoard: TP.MS3663S.PB801
IC MainBoard: SPI Flash: MX25L6405
Tuner: CDT-9NT372-RF01 & SAT
Technical Specifications F43D7000K
DEXP F43D7000K
General repair guidelines for TV LCD LED
Possible manifestations of defects
- DEXP F43D7000K does not turn on, does not respond to buttons and remote control, indicators on the front panel do not light up and do not blink.
In this case, first of all, you should check the operability of the main power source - the AC / DC network voltage converter, all of whose elements are located on the MainBoard TP.MS3663S.PB801 board. It is necessary to verify the presence of its output voltages and, if they are completely absent, check the power switches (TO-252) and rectifier diodes for a probable short circuit.
In case of breakdowns in the secondary circuits of the converter, it can usually fail in short circuit mode, and in case of a short circuit in the power elements of the primary circuit, the mains fuse or current sensor at the source of the key most often breaks.
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.
Usually in such cases there is no backlight LED-panel (matrix). Often the cause of the malfunction is the lack of current in the LED circuit, for example, an open or short circuit, or a violation of the contact connections of the connectors.
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 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 TP.MS3663S.PB801 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). Often, the MB (SSB) card must be replaced in case of complex malfunctions that are difficult to detect. When trying to repair, you should check its elements - SPI Flash: MX25L6405 and replace failed chips with new ones. Some malfunctions may be due to the use of BGA soldering technologies in modern Main Board technologies. Typically, such defects are detected by local heating of the chip.
If there is no reception of television channels, but the TV is working properly from external devices, first of all you need to check the power supply of the tuner CDT-9NT372-RF01 & SAT and update the software. The pulses from the I2C bus must be controlled with an oscilloscope.
Once again, remind users! Attempts to independently repair the DEXP F43D7000K TV without the appropriate qualifications and the necessary experience can lead to its complete non-repairability!
FIRMWARE FOR SPI FLASH -----------> DEXP F43D7000K, Main: TP.MS3663S.PB801, Panel: LC430DUY (SH)(A1)
The appearance of MainBoard TP.MS3663S.PB801 is shown in the figure below:TP.MS3663S.PB801
Main features of the DEXP F43D7000K 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 TP.MS3663S.PB801, controlled by an 8pin PWM controller. As power elements of the LED driver, keys of the TO-252 type are used.
The power module is combined with the MainBoard and is made according to the flyback AC / DC voltage converter circuit using PWM SOT23-6 microcircuits and TO-252 type power switches.
MainBoard - the main board (motherboard) is a TP.MS3663S.PB801 module, using SPI Flash chips: MX25L6405 and others.
The CDT-9NT372-RF01 & SAT tuner provides TV reception and channel tuning.
TV DEXP F43D7000K with LG LCD, diagonal size 43 "(109 cm) 16: 9 format. The required brightness of the screen is 250 cd / m² LED backlight LED. Contrast - the ratio of maximum brightness to minimum is 1200: 1. In LCD -panels use direct LED backlighting with direct LEDs - Direct LED.The TV features include viewing programs and movies in high quality HD at a resolution of 1920x1080 pixels in graphic resolution according to the standard 1080p (Full HD). Supported media file formats ia: MP3, MPEG4, HEVC (H.265), Xvid, MKV, JPEG.
The power of the sound system 20 W (2x10 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), AV, audio x2, component, VGA, HDMI x3, USB. An output for connecting headphones is provided. The digital tuner is capable of receiving television channels in the standards DVB-T MPEG4, DVB-C, DVB-T2, DVB-S2.
The power consumed by the TV working in the network mode is 75 watts.
Overall dimensions: with stand 971x609x209 mm, without stand 971x566x89 mm.
TV mass: with stand: 7.1 kg, without stand: 7 kg.
Attention! The LG LC430DUY (SH) (A1) panel of a DEXP F43D7000K 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.
