Technical description and composition of the BBK LEM3281FDT TV, type of panel and applicable modules. The composition of the modules.BBK LED
Model: LEM3281FDT
Chassis / Version: MSDV3209
Panel: V315B1-LE9 REV.C1
T-CON: V320HJ1-PE1 Rev. C6
LED driver (backlight): integrated into MainBoard
PWM LED driver: AP3608EM-G1 (20), AP3039AM-G1 (14)
MOSFET LED driver: B6010D (3)
Trans LED driver: 100
Power Supply (PSU): integrated into MainBoard
MainBoard: MSDV3209-ZC01-01 (D) 303C3209074
IC MainBoard: MSD308PX, DDR: W9751G6IB, SPI: SPI Flash: MX25L6406EMI-12G, Sound: TPA3113D2
Tuner: DT58WT-3RB-E
Control: RC-LEM100
BBK LED
Model: LEM3281FDT
Chassis / Version: MSDV3219-ZC01-01 228-120416007 mono board
Panel: V315B1-LE9 REV.C1
T-CON: V320HJ1 PE1 RevC6 CM501, CM2802A
LED driver (backlight): integrated into MainBoard
PWM LED driver: AP3608EM-G1, AP3039AM
Power Supply (PSU): integrated into MainBoard
MainBoard: MSDV3219-ZC01-01 mono board M11 / B3143 / 11
IC MainBoard: MX25L6405EMI-126, EUA2113
Tuner: DT58WT-3RB-E
Control: RC-LEM100
Technical Specifications LEM3281FDT
BBK LEM3281FDT
General repair guidelines for TV LCD LED
Possible malfunctions
- The BBK LEM3281FDT TV does not turn on at all. The control lights do not light or flash. On the remote control and the buttons on the control panel does not respond.
First of all, in such cases, you should verify the operability of the common switching power supply (IIP) - AC / DC voltage converter of the mains voltage. All source elements in this TV model are located on the MainBoard MSDV3219-ZC01-01 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 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, 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.
As a rule, in such cases there is no display 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.
To detect a break in the LED lines without disassembling the panel, a current source is required. It is impossible to open transitions connected in series with a simple multimeter; voltage of several tens of volts is necessary.
- 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 motherboard MSDV3219-ZC01-01 should begin by checking the stabilizers and power converters needed to power the chips and matrix. If necessary, update or replace the software (software). Often, the MB (SSB) card must be replaced in case of complex malfunctions that are difficult to detect. When trying to repair, you should check its elements - MX25L6405EMI-126, EUA2113, AP3039AM-G1 and replace failed chips with new ones. Some malfunctions may be due to the use of BGA soldering technologies in modern Main Board technologies. Typically, such defects are detected by local heating of the chip.
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.
Attention TV owners! Attempts to self-repair BBK LEM3281FDT are not recommended by the manufacturer and can lead to serious negative consequences!
SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> Main MSDV3209-ZC01-01 Schematic diagram
1. Service Manual with Schematic Diagram 81 pages of 2010 on the LED1952DTG, LED2252FDTG, LED2452FDTG, LEM2249FDT, LEM2265FDTG, LEM2285FDTG, LEM2449FDT, LEM2465FDTG, LEM2485FDTG, LEM2648DT, LEM2649FDT, LEM2665FDTG, LEM3281FDT, LEM3282DT, LEM3285FDTG
2. Schematic Diagrams 12 pages of 2011 on the model LEM1981DT, LEM2281FDT, LEM2465DTG, LEM2481FDT, LEM2648DT, LEM2649FTD, LEM2665FDTG, LEM2681FDT, LEM3248DT, LEM3249FDT, LEM3281FDT
To reduce the backlight current in LED drivers with the AP3039AM controller and the AP3608EM terminal stage (AP3039AM-G1 & AP3608EM-G1), the AP3608EM (AP3608E) microcircuit should proportionally increase the resistor from terminal 14 (ISET) to the housing. The maximum current in each channel (in milliamperes) for the Rset resistor (in kilo-ohms) is determined from the ratio 1.194V / Rset. In channels connected in parallel, the currents add up.
Repair MainBoard
The appearance of the MainBoard MSDV3209-ZC01-01 is shown in the figure below:
MainBoard MSDV3209-ZC01-01 uses a multifunctional microprocessor of the type MSD309PX or MSD308PX with an integrated scaler. Two RAM chips W9751G6IB are used as RAM. SPI Flash MX25L6406EMI-12G is made in the SOP-16 (16 pin) package.
It is advisable to start the repair of the motherboard by checking the voltage + 5V standby mode. In the operating mode, it is necessary to check the operability of linear stabilizers and power converters of the processor, memory, panel and other components of the board.
MSDV3209-ZC01-01 can be used in TVs:
BBK LEM3281FDT (Panel V315B1-LE9 REV.C1), BBK LEM3285FDTG (Panel V315H4-LE7 REV.C1), BBK LEM1949DT (Panel HT185WX3-100), BBK LEM3248DT (Panel V315B1-LE7 REV.C1), BBK LEM2665FDTG (Panel V260H1-LE8), BBK LEM3249FDT (Panel V315H4-LE8), BBK LEM2449FDT (Panel M236MWF7), BBK LEM3282DT (Panel V315B1-LEA), MYSTERY MTV-4018LW (Panel T390HVN01.0), MYSTERY MTV-4022LW (Panel M390HJ1-P01), MYSTERY MTV-4214LW (Panel T420HW08 V.5 FHD), MYSTERY MTV-3214LW (Panel V315H4-LE2 Rev.C1), MYSTERY MTV-4217LW (Panel T420HW09 V.9 (FHD)), MYSTERY MTV-3220LW (Panel V315H4-LE7).
Main features of the BBK LEM3281FDT device:
Installed matrix (LED panel) V315B1-LE9 REV.C1.
The matrix control uses the Timing Controller (T-CON) V320HJ1.
To power the backlight LEDs, a converter is used, combined with the main board MSDV3219-ZC01-01, controlled by the AP3608EM-G1, AP3039AM PWM controller.
The power module is combined with the MainBoard and is made according to the flyback AC / DC voltage converter circuit.
MainBoard - the main board (motherboard) is an MSDV3219-ZC01-01 module, using microchips MX25L6405EMI-126, EUA2113 and others.
Tuner DT58WT-3RB-E provides the reception of television programs and tuning to channels.
BBK LEM3281FDT LED TV with V315B1-LE9 LCD, 32 "(81 cm) diagonal size in 16: 9 format. The required screen brightness of 300 cd / m² is provided by LED backlighting. The ratio of maximum brightness to minimum (contrast) is 1000 : 1. This model uses Edge LED backlighting, and the design and technical features of the TV include watching broadcasts and movies in high quality HD at a resolution of 1920x1080 pixels in graphic resolution according to the standard 1080p (Full HD). Input high-frequency or video signal l can be processed in analog 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. The audio processing system NICAM STEREO is used.
The external interface (communication with other devices) is supported by standard input and output connectors: antenna input (RF), AV, audio x2, component, SCART, RGB, VGA, HDMI x2, USB. 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, 1280x1024, 1360x768. The digital tuner is capable of receiving television channels in DVB-T MPEG4 standards.
The power consumed by the TV in the operating mode from the network is 75 watts.
Overall dimensions: With stand 747x495x180 mm, Without stand 747x452x46 mm.
TV Weight: 7.4 kg.
Attention! The V315B1-LE9 REV.C1 panel of the BBK LEM3281FDT 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.
