Technical description and composition of the BBK LEM2481FDT TV, type of panel and applicable modules. The composition of the modules.BBK LED
Model: LEM2481FDT
Chassis / Version: MSDV3213-ZC01-01
Panel: V236H1-LE5 // HM236WUB-100
T-CON: V236H1-L01-X + C
LED driver (backlight): integrated into MainBoard
PWM LED driver: AP3039AM, AP3608EM-G1
MOSFET LED driver: EP58563
Trans LED driver: MSC-2YTO129
Power Supply (PSU): integrated into MainBoard
PWM Power: PWM SOT23-6
MainBoard: MSDV3213-ZC01-01
IC MainBoard: Cpu: MSD309PX-LF, Spi Flash: MX25L6406
Tuner: MTC236LED-C03F
Technical Specifications LEM2481FDT
BBK LEM2481FDT
General repair guidelines for TV LCD LED
Possible malfunctions
- The BBK LEM2481FDT TV does not turn on, does not respond to the remote control and the control panel buttons, the indicators do not light or flash.
Typically, with such manifestations, the defect is caused by faulty elements in the main power module. It is necessary to verify the presence of secondary voltages and, if they are absent, check the power switches 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.
The breakdown of Mos-Fet keys used in pulsed sources is often caused by malfunctions of other elements, for example, power, frequency-setting, damper ... as well as elements of the Negative Stabilization Feedback. The PWM chip can also cause a malfunction of the power switch of the converter and is checked by replacement.
- There is no image, there is sound, it responds to the remote control, the channels are switched. In some cases, the image appears when you turn on and immediately disappears.
The most likely in these cases is a malfunction of the LED backlight. 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 detect a break in the LED line without disassembling the panel with a simple multimeter. The LEDs are connected in series and to open their transitions, a voltage of several tens of volts is required. Ideally, a current source is suitable for such purposes. You can open the panel and check each LED separately. Typically, Chinese multimeters light up a single 3-volt LED if you connect the probes in the forward direction to it (red probe to the anode, 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 indicator on the front panel blinks, the TV does not turn on in the operating mode, it does not respond to the remote control.
Repair or diagnostics of the MAIN_PCB 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. Testing or replacing elements AP3608EM-G, M3014S, MX25L6406EMI-12G 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.
If you suspect a malfunction of the DT58WT-3RB-E tuner, first of all, it is necessary to verify the correctness of the software, as well as the presence of the necessary voltage levels and pulses of data exchange with the processor via the I2C bus at the corresponding terminals of the tuner.
It should be remembered! Attempts to independently repair the BBK LEM2481FDT 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!
FIRMWARE FOR SPI FLASH -----------> BBK LEM2481FDT, Main: MSDV3213-ZC01-01, Panel: V236H1-LE5
Schematic Diagrams 12 pages of 2011 on -------------> LEM1981DT, LEM2281FDT, LEM2465DTG, LEM2481FDT, LEM2648DT, LEM2649FTD, LEM2665FDTG, LEM2681FDT, LEM3248DT, LEM3249FDT, LEM3281FDT
The appearance of the MainBoard MSDV3213-ZC01-01 is shown in the figure below:MSDV3213-ZC01-01
MSDV3213-ZC01-01 can be used in TVs:
BBK LEM1981 (Panel V185B1-L17 Rev.C1 CMO), BBK LEM2481FDT (Panel V236H1-LE5), BBK LEM2682 LEM2682DT (Panel V260B2-LE11 Rev.C1), BBK LEM2281FDT (Panel CLAA215FA10), BBK LEM2685DTG (Panel V260H1-LE8 REV.C1), MYSTERY MTV-2620LW (Panel V260B2-LE3 Rev.c1).
Main features of the BBK LEM2481FDT device:
The matrix (LED panel) V236H1-LE5 or HM236WUB-100 is installed.
The matrix control uses the Timing Controller (T-CON) V236H1-L01-X + C.
To power the backlight LEDs, a converter is used, combined with the main board MSDV3213-ZC01-01, controlled by the AP3039AM, AP3608EM-G1 PWM controller. The transformer MSC-2YTO129 is installed in the converter of the LED driver. As power elements of the LED driver, keys of the type EP58563 are used.
The power module is combined with the MainBoard and is made according to the flyback AC / DC voltage converter circuit using PWM SOT23-6 microcircuits.
MainBoard - the main board (motherboard) is an MSDV3213-ZC01-01 module, using Cpu chips: MSD309PX-LF, Spi Flash: MX25L6406 and others.
The MTC236LED-C03F tuner provides television reception and channel tuning.
Additional technical information about the panel:
Brand: CHIMEI INNOLUX
Model: V236H1-LE5
Type: a-Si TFT-LCD, Panel
Diagonal size: 23.6 inch
Resolution: 1920x1080, FHD
Display Mode: TN, Normally White, Transmissive
Active Area: 521.28x293.22 mm
Surface: Antiglare (Haze 25%)
Brightness: 300 cd / m²
Contrast Ratio: 1000: 1
Display Colors: 16.7M (6-bit + Hi-FRC), CIE1931 72%
Response Time: 1.5 / 3.5 (Tr / Td)
Frequency: 60Hz
Lamp Type: 13S8P WLED Without Driver
Signal Interface: LVDS (2 ch, 8-bit), 30 pins
Voltage: 5.0V