Technical description and composition of the BBK 32LEX-5023 TV, type of panel and applicable modules. The composition of the modules.BBK LED
Model: 32LEX-5023 / T2C
Chassis / Version: CV338H-T42
Panel: V320BJ6-Q01 Rev. C1 (TH32YS1705C0327)
LED backlight: 16 LEDs. 3V. 370 mA; minus 1.5 ohm = 297 mA
LED driver (backlight): integrated into MainBoard
PWM LED driver: BIT3267
MOSFET LED driver: AOD4454
Power Supply (PSU): integrated into MainBoard
PWM Power: PF6000AG (PWM SOT23-6)
MOSFET Power: 7R600
MainBoard: CV338H-T42
IC MainBoard: CPU: MSD6A338, MSB102KT, W25Q16DVSSIG, MP7752, VA2221TSG28 (audio), THGBM8G5D1KBAIL (EMMC FLASH)
Tuner: CDT-9NT372RF-10
Specifications 32LEX-5023 / T2C
BBK 32LEX-5023
General repair guidelines for TV LCD LED
Possible manifestations of defects
- The BBK 32LEX-5023 TV does not turn on, does not respond to the remote control and buttons on the control panel, does not light up or blink indicators.
In this case, first of all, it is necessary to check the operability of the main power source - the AC / DC network voltage converter, all of whose elements are located on the MainBoard CV338H-T42 board. It is necessary to measure its output voltages, and in case of their absence, check the operability of the power switches of the converters and rectifier diodes for the probability of a 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.
The breakdown of power switches (MosFet) in pulsed sources is sometimes caused by malfunctions of other circuit elements, for example, in the circuits supplying the PWM controller, frequency-setting or damper ones, as well as in the circuits of Negative Feedback (OOS) stabilization. PWM controllers (PWM), if they do not have visible damage to the chassis and open short circuit between the terminals, are usually checked by replacement.
- There is no image, but there is sound and reaction to commands from the remote control. Or the image appears immediately after turning on and disappears.
Usually in such cases, a malfunction is detected in the backlight nodes of the LED panel. The reason for this may be a break in the LED circuit, or a problem in stabilizing their power supply.
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, the indicator indicates standby or operating mode, 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). Sometimes it is necessary to check or replace (if necessary) the elements of the MainBoard - CPU board: MSD6A338, MSB102KT, W25Q16DVSSIG, MP7752, VA2221TSG28 (audio), THGBM8G5D1KBAIL (EMMC FLASH). In cases where the BGA processor is used, its malfunction is usually detected by the local heating method.
If you suspect a malfunction of the CDT-9NT372RF-10 tuner, first of all, you need to verify the correctness of the software, as well as the presence of the necessary voltage levels and pulses of data exchange with the processor via the I2C bus at the corresponding terminals of the tuner.
TV users and owners need to remember that attempts to self-repair a BBK 32LEX-5023 TV without the appropriate qualifications and necessary experience can lead to serious negative consequences!
SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> BBK 32LEX-5024 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-5023 device:
Installed matrix (LED-panel) V320BJ6-Q01 Rev. C1 (TH32YS1705C0327).
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 flyback AC / DC voltage converter circuit using PF6000AG (PWM SOT23-6) microcircuits and 7R600 type power switches.
MainBoard - the main board (motherboard) is a CV338H-T42 module, using CPU chips: MSD6A338, MSB102KT, W25Q16DVSSIG, MP7752, VA2221TSG28 (audio), THGBM8G5D1KBAIL (EMMC FLASH) and others.
The tuner CDT-9NT372RF-10 provides the reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: CHIMEI INNOLUX
Model: V320BJ6-Q01
Type: a-Si TFT-LCD, CELL
Diagonal size: 31.5 inch
Resolution: 1366x768, WXGA
Display Mode: MVA, Normally Black, Transmissive
Active Area: 697.685x392.256 mm
Surface: Antiglare (Haze 2%)
Transmissivity: 6.0% (with Polarizer)
Contrast Ratio: 3000: 1
Display Colors: 16.7M (6-bit + Hi-FRC)
Response Time: 8.5 (G to G)
Frequency: 60Hz
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 12.0V
Brand: BBK, Model: 32LEX-5023 / T2C.
Briefly from the TV: LCD, 720p HD, 32 "(81 cm) diagonal, Smart TV (Android), Wi-Fi, HDMI: 2, USB: 3, there is support for DVB-T2.
The composition includes MainBoard CV338H-T42 and LCD panel (matrix) V320BJ6-Q01 Rev. C1. The power supply is combined with the MainBoard.
BBK 32LEX-5023 / T2C LED TV with V320BJ6-Q01 LCD, 32 "(81 cm) diagonal of 16: 9 format. The required brightness of the screen is 250 cd / m² with LED backlight. The ratio of maximum brightness to minimum ( contrast ratio) is 3000: 1. The LED display backlighting technology is implemented in the model’s display technology. You can view images in high quality HD at a resolution of 1366x768 pixels in the standard of graphic decomposition 720p (HD Ready).
32LEX-5023 / 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, WMA, MPEG4, MKV, JPEG.
The power of the sound system 16 W (2x8 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 x2, USB x3, Ethernet (RJ-45), Wi-Fi 802.11n, Miracast. An output for connecting headphones is provided. The digital tuner is capable of receiving television channels in the DVB-T MPEG4, DVB-C MPEG4, DVB-T2 standards.
Overall dimensions: With stand 737x473x190 mm, Without stand 737x435x83 mm.
The mass of the TV: 6.2 kg.
Attention! The BBK 32LEX-5023 / T2C LED TV panel V320BJ6-Q01 Rev. C1 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.
