Technical description and composition of the BBK LEM3248DT TV, panel type and applicable modules. The composition of the modules.BBK LED
Model: LEM3248DT
Chassis / Version: MSDV3209-ZC01-01
Panel: V315B1-LE7 REV.C1
LED backlight: 30331501207, 30331501206 - LED315ER / L-ZC14-01 (A)
LED driver (backlight): TV3231-ZC02-01 (B) 303C3231062
Power Supply (PSU): TV3207-ZC02-01 (B)
PWM Power: OB2263, ICE3B0565 (Stb)
MOSFET Power: FDPF7N65, AO4435
MainBoard: MSDV3209-ZC01-01 (D)
IC MainBoard: Cpu: MSD309PX, Spi Flash: 25L6406
Tuner: DT58WT-3RB-E
Control: IR: TV2631-ZC25-01 (B)
Technical Specifications LEM3248DT
BBK LEM3248DT
General repair guidelines for TV LCD LED
Possible manifestations of defects
- BBK LEM3248DT does not turn on, the indicators on the front panel do not light or flash. The TV does not respond to the control buttons and the remote control.
Often in such cases, the TV3207-ZC02-01 power module is faulty. Then we recommend that you measure its output voltages and, if they are absent, you should check the health of the power switches (FDPF7N65, AO4435) and rectifier diodes of the converters for possible 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 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 controllers OB2263, ICE3B0565 (Stb), in the absence of visible damage or explicit short-circuit between the terminals, are checked by replacing with new ones, or obviously working.
- There is no image, there is sound, all other functions of the TV work. When turned on, the image may sometimes appear for a second.
As a rule, in this case, the LED backlight turns out to be faulty. The reason can sometimes be in the power of the LEDs, but more often in their malfunction (breakdown or break), sometimes in the violation of the contact connections of the LED strips.
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. 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 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 MSDV3209-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). When repairing an MB board, you need to check its components Cpu: MSD309PX, Spi Flash: 25L6406. Defective items should be replaced. If chips with BGA soldering technology are used, a problem in its implementation is detected by the local heating of the chip.
Before replacing the DT58WT-3RB-E tuner, if there is no tuning for the channels, you must first check the software and the supply voltage at its terminals. It is also necessary to make sure that the tuner and processor can exchange data via I2C
Owners and users of the BBK LEM3248DT TV should remember that self-repair without special knowledge, skills and qualifications can be fraught with negative consequences that can lead to complete non-repairability of the device!
SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> Main MSDV3209-ZC01-01 Schematic diagram
FIRMWARE FOR SPI FLASH -----------> BBK LEM3248DT, Main: MSDV3209-ZC01-01(D), Panel: V315B1-LE7 REV.C1
Schematic Diagrams 12 pages of 2011 on LEM1981DT, LEM2281FDT, LEM2465DTG, LEM2481FDT, LEM2648DT, LEM2649FTD, LEM2665FDTG, LEM2681FDT, LEM3248DT, LEM3249FDT, LEM3281FDT.
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).
The appearance of the power supply
Main features of the BBK LEM3248DT device:
The matrix (LED panel) V315B1-LE7 REV.C1 is installed.
To power the backlight LEDs, the TV3231-ZC02-01 LED driver is used.
The necessary supply voltages for all nodes of the BBK LEM3248DT TV are generated by the TV3207-ZC02-01 power module or its analogs using OB2263, ICE3B0565 (Stb) microcircuits and power switches of the FDPF7N65, AO4435 type.
MainBoard - the main board (motherboard) is an MSDV3209-ZC01-01 module, using Cpu chips: MSD309PX, Spi Flash: 25L6406 and others.
Tuner DT58WT-3RB-E provides the reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: CMO
Model: V315B1-LE7
Type: a-Si TFT-LCD, Panel
Diagonal size: 31.5 inch
Resolution: 1366x768, WXGA
Display Mode: Super MVA, Normally Black, Transmissive
Active Area: 697.685x392.256 mm
Surface: Antiglare (Haze 11%), Hard coating (3H)
Brightness: 350 cd / m²
Contrast Ratio: 2000: 1
Display Colors: 16.7M (6-bit + Hi-FRC), CIE1931 70%
Response Time: 6.5 (G to G)
Frequency: 60Hz
Lamp Type: WLED Embedded (LED Driver)
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 12.0V
BBK LEM3248DT LED TV with V315B1-LE7 LCD, 32 "(81 cm) diagonal size in 16: 9 format. The required brightness of the screen is 450 cd / m² with LED backlighting. The ratio of maximum brightness to minimum (contrast) is 6000 : 1. This model uses side illumination from Edge LEDs. You can view images in high quality HD at a resolution of 1366x768 pixels in the standard for graphic decomposition 720p (HD Ready). The input high-frequency or video signal can be processed in analog systems PAL, SECAM, NTSC . Graphic processing and the formation of the digital signal is in 480i standards, 480p, 576i, 576p, 720p, 1080i, 1080p Supported multimedia 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, 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 768x540x180 mm, Without stand 768x498x43 mm.
TV Weight: 7.5 kg.
Attention! The V315B1-LE7 REV.C1 panel of the BBK LEM3248DT 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.