Technical description and composition of the BBK 43LEM-1023 TV, type of panel and applicable modules. The composition of the modules.BBK LED
Model: 43LEM-1023 / FTS2C
Chassis / Version: CV512H-B42
Panel: TH43YS1
T-CON: 6871L-3806BG
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
Specifications 43LEM-1023 / FT2C
BBK 43LEM-1023
General repair guidelines for TV LCD LED
Possible manifestations of defects
- The BBK 43LEM-1023 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 CV512H-B42, is often faulty. Then we recommend that you measure its output voltages and, if they are absent, you should check the health of the power switches (SMK0760F) and the rectifier diodes of the converters for possible short-circuit.
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 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 SOT23-6 PWM controllers, in the absence of visible damage or obvious short-circuit between the terminals, are checked by replacing with new ones, or obviously working.
- 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.
The most likely in these cases is a malfunction of the LED backlight. 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 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, the indicator indicates standby or operating mode, 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). Sometimes they require checking or replacing (if necessary) the elements of the MainBoard - CPU: 9206B 1533-DBN, SPI Flash: 25Q64. In cases where the BGA processor is used, its malfunction is usually detected by the local 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.
TV users and owners must remember that attempts to self-repair a BBK 43LEM-1023 TV without the appropriate qualifications and necessary experience can lead to serious negative consequences!
SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> MainBoard CV512H-B42-12
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 43LEM-1023 device:
Installed matrix (LED-panel) TH43YS1.
The matrix control uses the Timing Controller (T-CON) 6871L-3806BG.
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: 43LEM-1023 / FT2C.
Shortly from the TV: LCD, LED backlight, 43 ", 1920x1080, 1080p Full HD, DVR, sound: 16W, HDMI connectors: 3.
The composition uses MainBoard CV512H-B42 and LCD-panel TH43YS1. The power supply is combined with the MainBoard.
BBK 43LEM-1023 / FT2C LED TV with TH43YS1 LCD display, diagonal size 43 "(109 cm) 16: 9 format. The required brightness of the screen is 250 cd / m² LED backlight LED. The ratio of maximum brightness to minimum (contrast) is 1200: 1. The LED display technology is implemented in the model’s display technology. or the video signal can be processed in analogue systems PAL, SECAM, NTSC. Graphic processing and digital signal generation occurs in the standards 480i, 480p, 576i, 576p, 720p, 1080i. 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. A digital tuner is capable of receiving television channels in the DVB-T MPEG4, DVB-C, DVB-T2 standards.
Overall dimensions: with stand 972x605x209 mm, without stand 972x566x91 mm.
The mass of the TV: 9.3 kg.
Attention! The BB43 43LEM-1023 / FT2C LED TV panel TH43YS1 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.
