Technical description and composition of the BBK 50LEX-5039 TV, panel type and applicable modules. The composition of the modules.BBK LED
Model: 50LEX-5039 / FT2C
Chassis / Version: CV338H-T50
Panel: V500HJ3-PE1-C1
LED backlight: HF49D10L-ZC22AG-02 303HF490033
T-CON: 6201B000K7000
LED driver (backlight): integrated into MainBoard
Power Supply (PSU): integrated into MainBoard
PWM Power: PWM SOT23-6
MainBoard: CV338H-T50
IC MainBoard: CPU: MSD6A338SXG-0071, Nand: KLM4G1FEPD, Audio: MP7752
Tuner: NoName
Technical Specifications 50LEX-5039 / FT2C
BBK 50LEX-5039
General repair guidelines for TV LCD LED
Possible manifestations of defects
- The BBK 50LEX-5039 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 common power source, the AC / DC voltage converter, which is combined with the elements of the CV338H-T50 main board, is often faulty. It is necessary to measure its output voltages, and in case of their absence (full or partial), it is necessary to check the serviceability of the power switches of the converters and rectifier diodes for the presence of a possible short circuit.
In case of breakdowns of diodes 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.
The breakdown of Mos-Fet keys used in pulsed sources is often caused by malfunctions of other elements, for example, in the power supply circuit of a PWM controller, in frequency-setting or damping circuits, as well as in Negative Stabilization Feedback. PWM SOT23-6 PWM chips are usually checked by replacing with new ones, or obviously working.
- 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.
The most likely in these cases is a malfunction of the LED backlight. The reason can sometimes be in the power of the LEDs, but more often in their malfunction (breakdown or break), sometimes in the violation of the contact connections of the LED strips.
It is impossible to check the line of series-connected LEDs without a special current source, and for this purpose it is not safe to use any voltage sources above 12V for them. Then it remains only to open the panel and check each LED separately. Usually, Chinese 9V-powered multimeters light up a single 3-volt LED, if you connect the probes in the forward direction, the red probe to the anode, and the 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, does not respond to the remote control. The indicator blinks or signals standby mode.
Repair or diagnostics of the CV338H-T50 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: MSD6A338SXG-0071, Nand: KLM4G1FEPD, Audio: MP7752 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.
The failure of the NoName tuner 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.
TV users and owners must remember that attempts to self-repair a BBK 50LEX-5039 TV without the appropriate qualifications and necessary experience can lead to serious negative consequences!
The appearance of the MainBoard CV338H-T50 is shown in the figure below:CV338H-T50
Main features of the BBK 50LEX-5039 device:
Installed matrix (LED-panel) V500HJ3-PE1-C1.
The matrix control uses the Timing Controller (T-CON) 6201B000K7000.
To power the backlight LEDs, a converter is used, combined with the main board CV338H-T50.
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.
MainBoard - the main board (motherboard) is a CV338H-T50 module, using CPU chips: MSD6A338SXG-0071, Nand: KLM4G1FEPD, Audio: MP7752 and others.
The NoName tuner provides television reception and channel tuning.
Brand: BBK, Model: 50LEX-5039 / FT2C.
Short from TV: LCD, LED backlight, 50 ", 1920x1080, 1080p Full HD, DVR, sound: 16W, HDMI: 3, Internet access, Wi-Fi, Smart TV.
The composition uses MainBoard CV338H-T50 and LCD-panel V500HJ3-PE1-C1. The power supply is combined with the MainBoard.
BBK 50LEX-5039 / FT2C LED TV with V500HJ3-PE1-C1 LCD, 50 "(127 cm) diagonal size of 16: 9 format. The required screen brightness of 250 cd / m² is provided by LED backlighting. The ratio of maximum brightness to the minimum (contrast) is 5000: 1. The LED display technology is implemented in the model’s display technology, and the TV’s design and technical features include watching broadcasts and films in high quality HD at a resolution of 1920x1080 pixels in a graphic resolution of 1080p (Full HD).
50LEX-5039 / 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. 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 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 1125x710x253 mm, without stand 1125x647x81 mm.
The mass of the TV: 10.8 kg.
Attention! The V500HJ3-PE1-C1 panel of the BBK 50LEX-5039 / 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.