Technical description and composition of the BBK 40LEX-5025 TV, type of panel and applicable modules. The composition of the modules.BBK LED
Model: 40LEX-5025 / FT2C
Chassis / Version: CV628H-T42
Panel: V400HJ6-PE1 DLEDSV400FHD
LED driver (backlight): integrated into MainBoard
PWM LED driver: BIT3267 SOP-8
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 (MSB102KT)
Technical Specifications 49LEX-5048 / FT2C
BBK 40LEX-5025
General repair guidelines for TV LCD LED
Possible malfunctions
- BBK 40LEX-5025 does not turn on, the indicators on the front panel do not light or flash. The TV does not respond to the control buttons and the remote control.
In such cases, the main power source, the AC / DC voltage converter, which is combined with the MainBoard CV628H-T42, may turn out to be faulty. It is then necessary to measure its output voltages and, if they are absent, you should 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 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 controllers LD7536 (PWM SOT23-6), in the absence of visible damage or frank short-circuit between the terminals, are checked by replacing with new ones, or obviously working.
- There is no image, there is sound, it is responding to the remote control. Or immediately after turning on for a second, the image may appear and immediately disappear.
In some of these cases, the malfunction is caused by a lack of backlighting on the display. 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.
To check the health in the LED circuit it is better to use a current source with a maximum voltage of 200V. We do not recommend using any voltage sources for this purpose. You can check each LED individually with a simple Chinese multimeter (powered by 9 volts) in the P-N-junction test mode. If you connect the red probe of the multimeter to the anode of the LED, and the black to its cathode, then the 3-volt LED will light up slightly, and in the opposite direction you can detect the transition of the emergency zener diode. A zener diode PN junction indirectly indicates a LED-a
- The TV does not turn on, the indicator indicates standby or operating mode, or blinks.
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). Complex repair of MB (SSB) is possible only in the conditions of a service center with the necessary equipment. Checking or replacing CPU elements: MSD6A628VXM-ST, NAND: KLM4G1FEPD, SPI FLASH: Winb25Q16JVSIQ, AUDIO: TPA3110LD2 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.
Before changing the tuner CDT-9NT372-RF01 (MSB102KT), 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
Attention TV owners! Attempts at self-repair of BBK 40LEX-5025 are not recommended by the manufacturer and can lead to serious negative consequences!
psu led / 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 40LEX-5025 device:
Installed matrix (LED panel) V400HJ6-PE1 DLEDSV400FHD.
To power the backlight LEDs, a converter is used, combined with the main board CV628H-T42, controlled by a BIT3267 SOP-8 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 (MSB102KT) provides the reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: INNOLUX
Model: V400HJ6-PE1 Rev. C2
Type: a-Si TFT-LCD, CELL
Diagonal size: 40 inch
Resolution: 1920x1080, FHD
Display Mode: MVA, Normally Black, Transmissive
Active Area: 878.112x485.352 mm
Surface: Antiglare (Haze 1%)
Glass Depth: 0.50 + 0.50 mm
Transmissivity: 6.0% (with Polarizer)
Contrast Ratio: 5000: 1
Display Colors: 16.7M (8-bit)
Response Time: 8.5 (G to G)
Frequency: 60Hz
Signal Interface: LVDS (2 ch, 8-bit), 51 pins
Voltage: 12.0V