Technical description and composition of the BBK 40LEM-1010 TV, type of panel and applicable modules. The composition of the modules.BBK LED
Model: 40LEM-1010 / FT2C
Chassis / Version: CV512H-B42
Panel: CX390DLEDM
LED backlight: MS-L0676 V3 - 180.DT0-391800-1H
T-CON: T390XVN01.0 XL BD, 39T11-S00, T390XVN01.0 CTRL BD, 39T11-C02
LED driver (backlight): integrated into MainBoard
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 - 12-N5
IC MainBoard: CPU: 9206B 1533-DBN, 25Q64
Tuner: DMI21-C512RH
Control: RC-LEM100, RC-LEM2012
Technical Specifications 49LEX-5048 / FT2C
BBK 40LEM-1010
General repair guidelines for TV LCD LED
Possible malfunctions
- The BBK 40LEM-1010 TV does not turn on, the indicators on the front panel do not light or flash. The remote control does not respond to the control buttons.
The malfunction in such cases should be sought in the elements of the power source - the line voltage converter, which is located on the CV512H-B42 main board. It is necessary to measure its secondary output voltages, and in case of their absence, check the serviceability of the power switches of the converters and rectifier diodes for a short circuit.
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. It can be supply, damper circuits, or elements of OOS (negative feedback) stabilization. The reason for the breakdown of the power switch may be PWM (PWM). It is checked only by replacement with a known good one.
- There is no image, but there is sound and reaction to the remote control. Or for a second, the image may appear immediately after switching on.
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.
When trying to detect a break in the LED lines, it should be taken into account that it is difficult to do this without disassembling the panel. For example, a current source is needed to open PN junctions connected in series.
- 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). In cases of attempts to repair the MB (SSB) board, it is necessary to check the health of its elements - CPU: 9206B 1533-DBN, 25Q64 which may require replacement with new ones. If a BGA processor is installed, there is a possibility of a violation of the soldering of the contacts of its conclusions with the board (it is diagnosed by heating).
If there is no reception of television channels, but the TV works properly from external devices, first of all you need to check the voltage of the tuner DMI21-C512RH and update the software. The pulses from the I2C bus must be controlled with an oscilloscope.
It should be remembered! Attempts to independently repair the BBK 40LEM-1010 TV, in the absence of the necessary qualifications and experience, are categorically not recommended and are fraught with negative consequences, up to the complete non-repairability of the device!
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 40LEM-1010 device:
Installed matrix (LED-panel) CX390DLEDM.
The matrix control uses the Timing Controller (T-CON) T390XVN01.0.
To power the backlight LEDs, a converter is used, combined with the main board CV512H-B42, controlled by the 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, 25Q64 and others.
The DMI21-C512RH tuner provides TV reception and channel tuning.