Technical description and composition of the BBK 32LEX-5056 TV, panel type and applicable modules. The composition of the modules.BBK LED
Model: 32LEX-5056 / T2C
Chassis / Version: CV338H-T42
Panel: CX315DLEDM
LED backlight: MS-L1588 V2 A3 117-120LM
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
MOSFET Power: TO-252
MainBoard: CV338H-T42
IC MainBoard: MSD6A338, MSB102KT, W25Q16DVSSIG, THGBM8G5D1KBAIL
Tuner: CDT-9NT372RF-10 (R842)
Control: IR: 890.E00-LE50660-0H
Specifications 32LEX-5056 / T2C
BBK 32LEX-5056
General repair guidelines for TV LCD LED
Possible malfunctions
- The BBK 32LEX-5056 TV does not turn on, does not respond to the remote control and the control panel buttons, the indicators do not light or flash.
In such cases, the AC / DC voltage converter, which is combined with the main board CV338H-T42, is often faulty. In the absence of the necessary supply voltages in the secondary circuits of the converters, it is necessary to check the power switches (TO-252) and rectifier diodes for a possible partial or complete breakdown.
In case of breakdowns in the secondary circuits, the converter, as a rule, can emergency work in the short circuit mode, and during short circuit in the power elements of the primary circuit, the mains fuse 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, there is sound, it responds to the remote. Or the image may appear for a second when turned on and immediately disappears.
Usually in such cases, a malfunction is detected in the backlight nodes of the LED panel. More often the reason for this is the breakdown of the LEDs, or poor contact in the connectors of the strips, less often the LED driver may be malfunctioning.
When diagnosing, it is necessary to take into account that it is impossible to check the open in the chain of LED lines without disassembling the panels using a tester or multimeter. To open all PN junctions connected in series, a voltage of the order of several tens of volts is required, and ideally, a current source. By opening the panel, each LED can be checked separately. Typically, Chinese multimeters light up a single 3-volt LED, if you connect probes in the forward direction to it. 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 indicator on the front panel blinks, the TV does not turn on in the operating mode, it does not respond to the remote control.
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). Board repair and chip replacement MSD6A338, MSB102KT, W25Q16DVSSIG, THGBM8G5D1KBAIL are carried out with the necessary equipment, and the corresponding element base. Faults associated with the application of BGA processor soldering technologies can be localized by the heating method.
Before changing the tuner CDT-9NT372RF-10 (R842), if it is not possible to tune to television channels, make sure that there are supply voltages that need to be measured on 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
Owners and users of the BBK 32LEX-5056 TV should remember that self-repair without special knowledge, skills and qualifications can be fraught with negative consequences that can lead to complete non-repairability of the device!
SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> Chassis CV338H-T42-13B
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 32LEX-5056 device:
Installed matrix (LED-panel) CX315DLEDM.
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 designed according to a flyback AC / DC voltage converter using PWM SOT23-6 microcircuits and TO-252 type power switches.
MainBoard - the main board (motherboard) is a CV338H-T42 module, using microchips MSD6A338, MSB102KT, W25Q16DVSSIG, THGBM8G5D1KBAIL and others.
The tuner CDT-9NT372RF-10 (R842) provides the reception of television programs and tuning to channels.
Brand: BBK, Model: 32LEX-5056 / T2C.
Shortly from the TV: LCD, LED backlight, 31.5 ", 1366x768, 720p HD, sound: 16W, HDMI connectors: 3, Internet access, Wi-Fi, Smart TV.
Manufacturer: TELEBALT Kaliningrad, Kamskaya, 62. The assembly can be in the city of Guards, st. Station, 6 (PKV).
Developer: BBK Electronics LTD. China
The composition uses MainBoard CV338H-T42 and LCD-panel CX315DLEDM. The power supply is combined with the MainBoard.
BBK 32LEX-5056 / T2C LED TV with CX315DLEDM LCD, diagonal size 31.5 "(80 cm) in 16: 9 format. The required brightness of the screen is 250 cd / m² with LED backlight LED. The ratio of maximum brightness to minimum (contrast) is 5000: 1. The LED display is implemented in the manufacturing technology of the model’s display, and you can view images in high quality HD at a resolution of 1366x768 pixels in the standard of graphic decomposition 720p (HD Ready).
32LEX-5056 / T2C 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 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, USB x2, Ethernet (RJ-45), Wi-Fi 802.11n. 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.
The power consumed by the TV in the operating mode from the network is 56 watts.
Overall dimensions: with stand 737x477x212 mm, without stand 732x434x87 mm.
The mass of the TV: 5.2 kg.
Attention! The CX315DLEDM panel of the BBK 32LEX-5056 / T2C 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.