Technical description and composition of the DEXP F43B7200C TV, type of panel and applicable modules. The composition of the modules.DEXP LED
Model: F43B7200C
Chassis / Version: JUC7.820.00125910
Panel: C430F14-E1-L
LED backlight: SUJ430A07-Rev07-5LED L / R 150122 (GD43D2000) LB-C430F14-E1-L-G1-SE1
T-CON: T-CON 6870C-0532A + 6870S-1932C
LED driver (backlight): integrated into PSU
PWM LED driver: MP4012
MOSFET LED driver: AOD458
Power Supply (PSU): R-HS105D-1MF11 XR7.820.497V1.3
MainBoard: JUC7.820.00125910
IC MainBoard: 9206B (1513-DBN 9206B MSLGGS 1439-DBN 4500009), GD25Q64
Tuner: CH DM121 C816RH
Technical Specifications F43B7200C
DEXP F43B7200C
General repair guidelines for TV LCD LED
Possible manifestations of defects
- DEXP F43B7200C does not turn on at all and does not show any signs of operability. Does not blink indicators and does not respond to control buttons.
With such manifestations, in most cases, the R-HS105D-1MF11 power module is faulty. Then we recommend that you measure its output voltages and, if they are absent, you should check the health of the power switches and rectifier diodes of the converters for possible short-circuit.
During thermal or avalanche breakdowns of semiconductors in the secondary circuits of any converter, as a rule, it can operate in emergency short circuit mode without output voltages, and during short circuit in the elements of the primary circuit, the main fuse and, less often, the current sensor at the source of the key are most often cut off.
The breakdown of Mos-Fet keys used in pulsed sources is often caused by malfunctions of other elements, for example, power supply, frequency-setting, damper ... as well as elements of the Negative Stabilization Feedback. The PWM chip can also cause a malfunction of the power switch of the converter and is checked by replacement.
- There is no image, but there is sound and reaction to the remote control. Or for a second, the image may appear immediately after switching on.
Usually in such cases, a malfunction is detected in the backlight nodes of the LED panel. The reason can be both in the power supply of the LEDs, in their serviceability (breakdown or breakage), as well as in the violation of the contact connections of the LED strips.
To check the LED strips, to open all the transitions of the LEDs, several tens of volts or more are needed, it is best to use a current source for such purposes. The breakage of several PN junctions connected in series cannot be detected with a multimeter or tester. In such cases, it is necessary to open the panel and check each LED. If your multimeter cannot open the LED transitions in forward bias, you can sometimes detect the presence of a PN junction of the protective zener diode by connecting the probes in the opposite direction. If the zener diode is broken or broken in short-circuit, then the LED is faulty and needs to be replaced.
- 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 JUC7.820.00125910 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). In cases of complex repairs of MB (SSB) and in the presence of the necessary skills and equipment, sometimes it may be necessary to replace its chips 9206B (1513-DBN 9206B MSLGGS 1439-DBN 4500009), GD25Q64 and other possible faulty components. Malfunctions associated with the application of BGA soldering technologies are usually easily diagnosed by the heating method.
Before replacing the tuner CH DM121 C816RH, if there is no tuning for the channels, you must first check the software and the supply voltage at its terminals. It is also necessary to make sure that the tuner and processor can exchange data via the I2C bus
Attention! For users and owners of F43B7200C TVs who do not have the appropriate qualifications, knowledge and experience, we strongly recommend against attempting self-repair in order to avoid negative consequences that could lead to complete non-repairability of the device.
FIRMWARE FOR SPI FLASH -----------> DEXP F43B7200C, Main: JUC7.820.00125910, Panel: C430F14-E1-L
The appearance of the MainBoard JUC7.820.00125910 is shown in the figure below:JUC7.820.00125910
JUC7.820.00125910 can be used in TVs:
DEXP F55B7200C (Panel C550F14-E6-L), DEXP F43B7200C (Panel C430F14-E1-L).
The appearance of the power supply
Main features of the DEXP F43B7200C device:
Installed matrix (LED panel) C430F14-E1-L.
The matrix control uses the Timing Controller (T-CON) T-CON.
To power the backlight LEDs, a converter is used, combined with a power supply, controlled by the MP4012 PWM controller. As power elements of the LED driver, keys of the AOD458 type are used.
The formation of the necessary supply voltages for all nodes of the DEXP F43B7200C TV is carried out by the power module R-HS105D-1MF11, or its analogues.
MainBoard - the main board (motherboard) is a JUC7.820.00125910 module, using chips 9206B (1513-DBN 9206B MSLGGS 1439-DBN 4500009), GD25Q64 and others.
The CH DM121 C816RH tuner provides TV reception and channel tuning.
DEXP F43B7200C TV with C430F14-E1-L LCD, 43 "(109 cm) diagonal size in 16: 9 format. The required brightness of the screen is 350 cd / m² LED backlighting. Contrast - the ratio of maximum brightness to minimum is 1200: 1. The LCD panel uses direct backlighting of pixels with a rear LED arrangement - Direct LED.The TV features include viewing programs and movies in high quality HD at a resolution of 1920x1080 pixels in a graphic resolution of 1080p (Full HD) standard. Input high-frequency or video The signal is decoded in analog systems PAL, SECAM, NTSC. Graphic processing and digital signal generation occurs in the 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), AV, component, VGA, HDMI x3, USB. 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, 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 965x620x180 mm, without stand 965x560x90 mm.
TV Weight: with stand: 8.1 kg, without stand: 7.5 kg.
Attention! The C430F14-E1-L panel of a DEXP F43B7200C 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.