Technical description and composition of the BBK 43LEX-5038 TV, panel type and applicable modules. The composition of the modules.BBK LED
Model: 43LEX-5038 / FT2C
Chassis / Version: CV338H-T42
Panel: CX430DLEDM
LED driver (backlight): integrated into MainBoard
PWM LED driver: BIT3267
MOSFET LED driver: AOD4454
Power Supply (PSU): integrated into MainBoard
PWM Power: PWM SOT23-6 6000A
MOSFET Power: 70R380P
MainBoard: CV338H-T42
IC MainBoard: MSD6A338, MSB102KT, W25Q16, KLM4G1FEPD, MP7752
Tuner: CDT-9NT372-RF01 MT7601UN
Specifications 43LEX-5038 / FT2C
BBK 43LEX-5038
General repair guidelines for TV LCD LED
Possible malfunctions
- The BBK 43LEX-5038 TV does not turn on and does not show any signs of operability at all. There is no reaction to the remote control and control buttons from the front panel.
In such cases, the AC / DC voltage converter, which is combined with the main board CV338H-T42, is often faulty. It is necessary to measure its output voltages, and if they are absent (full or partial), you should check the health of the power switches (70R380P) of the converters and rectifier diodes for a possible short circuit.
In case of any breakdowns in the secondary circuits, the converter can operate in emergency short circuit mode, and during short circuit in the power elements of the primary circuit, the mains fuse or the current sensor at the source of the key more often 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 SOT23-6 6000A PWM controllers, in the absence of visible damage or obvious short-circuit between the terminals, are checked by replacing with new ones, 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.
The faulty usually in these cases is the backlight matrix (LED-panel). Usually the cause of the malfunction is in the breakage of the LEDs, or in the connectors of the LED strips, but sometimes the LED driver also turns out to be faulty.
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 CV338H-T42 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). When repairing an MB board, you need to check its components MSD6A338, MSB102KT, W25Q16, KLM4G1FEPD, MP7752. Defective items should be replaced. If chips with BGA soldering technology are used, a problem in its implementation is detected by the local heating of the chip.
Before changing the tuner CDT-9NT372-RF01 MT7601UN, if it is not possible to tune to television channels, make sure that there are supply voltages that need to be measured at the corresponding terminals of the tuner and check the software for correctness. The pulses of the data exchange of the tuner with the processor can be controlled by an oscilloscope
It should be remembered! Attempts to independently repair the BBK 43LEX-5038 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!
The appearance of the MainBoard CV338H-T42 is shown in the figure below:CV338H-T42
CV338H-T42 can be used in TVs:
BBK 32LEX-5023/T2C (Panel V320BJ6-Q01 Rev.C1 (TH32YS1705C0327)), BBK 32LEX-5024/T2C (Panel TH32YS1704D0089).
Main features of the BBK 43LEX-5038 device:
Installed matrix (LED-panel) CX430DLEDM.
To power the backlight LEDs, a converter is used, combined with the main board CV338H-T42, controlled by a BIT3267 PWM controller. As power elements of the LED driver, keys of the AOD4454 type are used.
The power module is combined with the MainBoard and is made according to the scheme of a flyback AC / DC voltage converter using PWM SOT23-6 6000A microcircuits and power switches of the 70R380P type.
MainBoard - the main board (motherboard) is a CV338H-T42 module, using microchips MSD6A338, MSB102KT, W25Q16, KLM4G1FEPD, MP7752 and others.
The tuner CDT-9NT372-RF01 MT7601UN provides the reception of television programs and tuning to channels.
Trademark: BBK, Model: 43LEX-5038 / FT2C.
Briefly from the TV: LCD, 1080p Full HD, diagonal 43 "(109 cm), Smart TV (Android), Wi-Fi, HDMI: 3, USB: 2, there is support for DVB-T2.
The composition uses MainBoard CV338H-T42 and LCD-panel (matrix) CX430DLEDM. The power supply is combined with the MainBoard.
BBK 43LEX-5038 / FT2C LED TV with CX430DLEDM LCD, diagonal size 43 "(109 cm) in 16: 9 format. The required screen brightness of 250 cd / m² is provided by LED backlight LED. The ratio of maximum brightness to minimum (contrast) is 3000: 1. The LED display is implemented in the model’s display manufacturing technology.
43LEX-5038 / FT2C 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, WMA, MPEG4, MKV, JPEG.
The power of the sound speaker system 16 W (2x8 W) is provided by 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, MHL, USB x2, Ethernet (RJ-45), Wi-Fi 802.11n, Miracast. 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 968x590x179 mm, without stand 968x560x72 mm.
The mass of the TV: 7.9 kg.
Attention! The CX430DLEDM panel of the BBK 43LEX-5038 / FT2C 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.
