Technical description and composition of the BBK 40LEM-1005 TV, type of panel and applicable modules. The composition of the modules.BBK LED
Model: 40LEM-1005 / FT2C
Chassis / Version: CV512H-B42
Panel: CX400DLEDM
LED backlight: CXD400410000-X3 SKYWORTH.LCD
T-CON: V460HJ6-PE1
LED driver (backlight): integrated into PSU
PWM LED driver: BIT3267
MOSFET LED driver: ME15N10
Power Supply (PSU): integrated into MainBoard
PWM Power: PWM SOT23-6
MOSFET Power: SMK0760F
MainBoard: CV512H-B42
IC MainBoard: CPU: 9206B 1533-DBN, SPI Flash: 25Q64
Tuner: CDT-9NT372-RF01 & CDT-9NS161-RD41
Control: IR: 200-GJR-LE32280-0H
Specifications 40LEM-1005 / FT2C
BBK 40LEM-1005
General repair guidelines for TV LCD LED
Possible manifestations of defects
- BBK 40LEM-1005 TV does not turn on. There are no signs of operability. The indicators on the front panel do not light or flash, the TV does not respond to the remote control and control buttons.
In such cases, the common power source, the AC / DC voltage converter, which is combined with the elements of the CV512H-B42 main board, is often faulty. It is necessary to measure its output voltages and, if they are absent, check the serviceability of power switches (SMK0760F) and rectifier diodes in the converters for possible breakdown.
In case of breakdowns of semiconductors in the secondary circuits, the converter can usually work abnormally in the short circuit mode, and during short circuit in the power elements of the primary circuit, the mains fuse often 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) 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.
A malfunction is usually most likely in these cases at the backlight nodes of the display matrix. 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 enter the operating mode, does not respond to the remote control. The indicator on the front panel lights constantly or blinks.
Repair or diagnostics of the CV512H-B42 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 replacement of CPU chips: 9206B 1533-DBN, SPI Flash: 25Q64 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.
In the absence of tuning to the channels of on-air or cable television, you should make sure that the software is correct, as well as in accordance with the ratings of the supply voltage at the terminals of the tuner CDT-9NT372-RF01 & CDT-9NS161-RD41. It is also necessary to check the presence of pulses of data exchange between the tuner and the processor via the I2C bus using an oscilloscope.
Once again, remind users! Attempts to self-repair a BBK 40LEM-1005 TV without the appropriate qualifications and the necessary experience can lead to its complete unrepairability!
SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> MainBoard CV512H-B42-12
Service Manual with Schematic Diagram 52 pages of 2015 on the model ------------------> 28LEM-1012/T2C, 32LEM-1005/T2C, 32LEM-1007/T2C, 32LEM-1010/T2C, 32LEM-3025/T2C, 32LEX-5009/T2C, 40LEM-1010/FT2C, 40LEM-1007/FT2C, 40LEM-1005/FT2C, 40LEM-1010/T2C, 40LEM-1017/T2C, 40LEM-3025/FT2C, 40LEM-3035/FT2C, 40LEX-5009/FT2C, 43LEM-1007/FT2C, 43LEM-1009/FT2C, 43LEX-5009/FT2C, Rubin RB-32D7T2S.
The appearance of the MainBoard CV512H-B42 is shown in the figure below:CV512H-B42
CV512H-B42 can be used in TVs:
BBK 40LEM-1010/FT2C (Panel CX390DLEDM), BBK 32LEM-1023/TS2C (Panel V320BJ6-Q01), BBK 32LEM-3035/T2C (Panel LS320TU9A00 NJ), BBK 32LEM-1036/TS2C (Panel DS32D6AP0113), BBK 42LEM-1009/FT2C (Panel T420HVN06.1 CX420DLEDM), DEXP F40B7000E (Panel V400HJ6-PE1 CX400DLEDM).
Main features of the BBK 40LEM-1005 device:
Installed matrix (LED-panel) CX400DLEDM.
The matrix control uses the Timing Controller (T-CON) V460HJ6-PE1.
To power the backlight LEDs, a converter is used, combined with a power supply, controlled by a BIT3267 PWM controller. As the power elements of the LED driver, keys of the type ME15N10 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 power switches of the SMK0760F type.
MainBoard - the main board (motherboard) is a CV512H-B42 module, using CPU chips: 9206B 1533-DBN, SPI Flash: 25Q64 and others.
The tuner CDT-9NT372-RF01 & CDT-9NS161-RD41 provides the reception of television programs and tuning to channels.
Brand: BBK, Model: 40LEM-1005 / FT2C.
Shortly from the TV: LCD, 1080p Full HD, 40 "(102 cm) diagonal, HDMI connectors: 3, have USB, have support for DVB-T2, backlight type: Edge LED, have PIP.
The composition uses MainBoard CV512H-B42 and LCD-panel CX400DLEDM. The power supply is combined with the MainBoard.
BBK 40LEM-1005 / FT2C LED TV with a CX400DLEDM LCD, 40 "(102 cm) diagonal size of 16: 9 format. The required screen brightness of 280 cd / m² is provided by LED backlighting. The ratio of maximum brightness to minimum (contrast) is 5000: 1. This model uses lateral illumination from Edge LEDs. The design and technical capabilities of the TV include viewing programs and movies in high quality HD at a resolution of 1920x1080 pixels in a graphic resolution of 1080p (Full HD) standard. Input high-frequency or video the signal can be processed in analogue systems PAL, SECAM, NTSC. Graphic processing and digital signal generation occurs in standards 480i, 480p, 576i, 576p, 720p, 1080i, 1080p. Supported media file formats: MP3, WMA, MPEG4, MKV, JPEG .
The power of the sound system 16 W (2x8 W) provide 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, audio x2, component, SCART, VGA, HDMI x3, USB. An output for connecting headphones is provided. To connect a computer or laptop to this TV model, a VGA (D-Sub 15) connector is used on the TV case, this interface supports resolutions: 640x480, 800x600, 1024x768, 1360x768. The digital tuner is capable of receiving television channels in the DVB-T MPEG4, DVB-C MPEG4, DVB-T2 standards.
Overall dimensions: With stand 909x561x210 mm, Without stand 909x516x70 mm.
TV Weight: 8.8 kg.
Attention! The CX400DLEDM panel of the BBK 40LEM-1005 / 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.
