Technical description and composition of the BBK 32LEX-5027 TV, type of panel and applicable modules. The composition of the modules.BBK LED
Model: 32LEX-5027 / T2C
Chassis / Version: CV628H-T42
Panel: V320BJ6-Q01 Rev. C1
LED driver (backlight): integrated into MainBoard
PWM LED driver: BIT3267
MOSFET LED driver: AOD4454
Power Supply (PSU): integrated into MainBoard
PWM Power: LD7536 (PWM SOT23-6)
MOSFET Power: SMK10N60
MainBoard: CV628H-T42
IC MainBoard: CPU: MSD6A628VXM-ST, NAND: KLM4G1FEPD, SPI FLASH: Winb25Q16JVSIQ, AUDIO: TPA3110LD2
Tuner: CDT-9NT372-RF01
Control: RC-LEM100, RC-LEM2012
Specifications 32LEX-5027 / T2C
BBK 32LEX-5027
General repair guidelines for TV LCD LED
Possible manifestations of defects
- The BBK 32LEX-5027 TV does not turn on at all. There is no reaction to the remote control and control buttons from the front panel. Indicator lights do not light or flash.
The malfunction in such cases should be sought in the elements of the power source - the network voltage converter (AC / DC), which is located on the MainBoard CV628H-T42 main board. It is then necessary to measure its output voltages and, if they are absent, check the power switches (SMK10N60) and the rectifier diodes of the converters for a short circuit probability.
In case of breakdowns in the secondary circuits, the converter can operate in a short circuit mode, and during a short circuit in the elements of the primary circuit, the mains fuse usually breaks.
Mos-Fet keys used in switching power supplies usually fail due to a malfunction of other elements that can put it out of operation in key mode or provoke an excess of the maximum current or voltage. These can be circuits supplying the PWM controller, damping or frequency-setting circuits, or elements of OOS (negative feedback) in the stabilization circuit. PWM controllers (PWM) LD7536 (PWM SOT23-6), in the absence of external damage and short circuit between the terminals, are checked by replacing with obviously good ones.
- 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.
In such cases, the most likely malfunction of the LED backlight elements. 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.
It is impossible to check the LED line for breaks without disassembling the panel with a multimeter or tester. For these purposes, it is necessary to open all series-connected PN junctions and a voltage of the order of tens of volts is required, and ideally, a current source. Having disassembled the panel, it is necessary to check each LED separately. Chinese multimeters, as a rule, light up a single 3-volt LED in the forward direction. In the case of using dual 6-volt LEDs, the PN junction of its protective zener diode can serve as a health indicator. In faulty LEDs, the 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 CV628H-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). Sophisticated MB board repair (SSB) is in some cases possible and practiced by repairmen. To do this, check and, if necessary, replace the CPU elements: MSD6A628VXM-ST, NAND: KLM4G1FEPD, SPI FLASH: Winb25Q16JVSIQ, AUDIO: TPA3110LD2. BGA chip malfunctions are usually easy to detect by warming up.
The malfunction of the tuner CDT-9NT372-RF01 is established after checking the software and all supply voltages at its terminals. The data exchange of the tuner with the processor via the I2C bus can be controlled by an oscilloscope.
Owners and users of the BBK 32LEX-5027 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!
psu / SERVICE MANUAL ------------------> CV628H-T42 Power supply
The appearance of the MainBoard CV628H-T42 is shown in the figure below:CV628H-T42
CV628H-T42 can be used in TVs:
BBK 43LEX-5009/FT2C (Panel LC430DUY (SH)(A1)), BBK 40LEX-5025/FT2C (Panel V400HJ6-PE1 DLEDSV400FHD), BBK 32LEX-5027/T2C (Panel V320BJ6-Q01 Rev.C1), SUPRA STV-LC40ST900FL (Panel V400HJ6-PE1).
Main features of the BBK 32LEX-5027 device:
Installed matrix (LED panel) V320BJ6-Q01 Rev. C1.
To power the backlight LEDs, a converter is used, combined with the main board CV628H-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 the flyback AC / DC voltage converter using LD7536 microcircuits (PWM SOT23-6) and power switches of the SMK10N60 type.
MainBoard - the main board (motherboard) is a CV628H-T42 module, using CPU chips: MSD6A628VXM-ST, NAND: KLM4G1FEPD, SPI FLASH: Winb25Q16JVSIQ, AUDIO: TPA3110LD2 and others.
The tuner CDT-9NT372-RF01 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-5027 / T2C.
Briefly from the TV: LCD, 720p HD, diagonal 31.5 "(80 cm), Smart TV (Android), Wi-Fi, HDMI: 3, USB: 3, there is support for DVB-T2.
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 includes MainBoard CV628H-T42 and LCD panel (matrix) V320BJ6-Q01 Rev. C1. The power supply is combined with the MainBoard.
BBK 32LEX-5027 / T2C LED TV with V320BJ6-Q01 LCD display, 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 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-5027 / 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 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 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 732x477x212 mm, Without stand 732x434x87 mm.
TV Weight: 5.7 kg.
Attention! The BB3 32LEX-5027 / 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.
