Technical description and composition of the BBK LEM1949DT TV, type of panel and applicable modules. The composition of the modules.BBK LED
Model: LEM1949DT
Chassis / Version: MSDV3209-ZC01-01
Panel: HT185WX3-100
MainBoard: MSDV3209-ZC01-01 (D)
IC MainBoard: Cpu: MSD309PX-LF-SW, Spi Flash: 25Q6406, DDR: NT5TU32M16DG-AC (2-PC)
Tuner: DT58WT-3RB-E
Technical Specifications LEM1949DT
BBK LEM1949DT
General repair guidelines for TV LCD LED
Repair of the BBK LEM1949DT TV should begin with a careful external examination of all its components and modules. Sometimes, based on visible changes in the components of the device, it is possible to draw some conclusions and determine the direction of further troubleshooting even before the necessary measurements are taken. Electrolytic capacitors of filters with a swollen casing, as well as ring cracks formed in the soldered leads of heating elements, or a layer of coal on burnt resistors sometimes tell the repairman the causes of the malfunction and possible consequences.
In the absence of any signs of operability, when the BBK LEM1949DT does not turn on and does not signal anything with the control lights on the panel, there is a possibility of a malfunction of the TV power module. With the same manifestations, the power regulator of the control processor on the motherboard may be faulty. When diagnosing and repairing the power supply, first of all, replace the swollen filter capacitors of the secondary rectifiers and check the fuse and, if it is broken, it is necessary to identify the cause. Often in such cases, an avalanche (thermal) breakdown is detected in the power semiconductor elements of the module — rectifier diodes and transistors in the primary circuit.
The reasons for the breakdown of the power switch in switching power supplies (IIPS) can be different, for example, a malfunction of semiconductor cells or electrolytic capacitors in the stabilization circuits of the primary circuit, as well as a failure in the operation of the PWM controller chip or broken resistors in its bundle.
Sometimes the BBK LEM1949DT TV does not have an image, but there is sound, or the image appears and immediately disappears. In this case, there is a high probability of a malfunction of the HT185WX3-100 panel backlight LED converter, or an open circuit in the LED circuit is possible. In such cases, first of all, it is necessary to verify the serviceability of all the electrolytic capacitors of the filter by supplying the LED driver itself, including in the power supply unit (power supply unit).
To check the health of the LEDs and contact connections in their power circuit, the panel must be disassembled.
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.
Repair of the motherboard MSDV3209-ZC01-01 (D) must begin with the diagnosis and verification of all linear stabilizers or power converters of its microcircuits. Sometimes it may be necessary to update the software (software) - flashing FLASH or EEPROM.
Board repair and replacement of Cpu microcircuits: MSD309PX-LF-SW, Spi Flash: 25Q6406, DDR: NT5TU32M16DG-AC (2-ШТ) are carried out with the necessary equipment, and the corresponding element base. Faults associated with the application of BGA processor soldering technologies can be localized by the heating method.
In cases where there is no tuning to local television channels, you should make sure that there are supply voltages at the terminals of the DT58WT-3RB-E tuner.
Owners and users of the BBK LEM1949DT TV must 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!
Main MSDV3209-ZC01-01 Schematic diagram
FIRMWARE FOR SPI FLASH -----------> BBK LEM1949DT, Main: MSDV3209-ZC01-01(D), Panel: HT185WX3-100
The appearance of the MainBoard MSDV3209-ZC01-01 is shown in the figure below:The MainBoard MSDV3209-ZC01-01 uses a multifunctional microprocessor 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 LEM1949DT device:
Installed matrix (LED panel) HT185WX3-100.
The required supply voltage for all nodes of the BBK LEM1949DT TV provides a switching power supply.
MainBoard - the main board (motherboard) is an MSDV3209-ZC01-01 module, using Cpu microcircuits: MSD309PX-LF-SW, Spi Flash: 25Q6406, DDR: NT5TU32M16DG-AC (2-PC) and others.
Tuner DT58WT-3RB-E provides the reception of television programs and tuning to channels.
Brand: BBK, Model: LEM1949DT.
Briefly from the TV: LCD, 720p HD, diagonal 19 "(48 cm), HDMI: 2, USB, backlight type: Edge LED.
The composition uses MainBoard MSDV3209-ZC01-01 (D) and an LCD panel (matrix) HT185WX3-100.
BBK LEM1949DT LED TV with HT185WX3-100 LCD display, 19 "(48 cm) diagonal size in 16: 9 format. The required screen brightness of 250 cd / m² is provided by LED backlighting. The ratio of maximum brightness to minimum (contrast) is 800 : 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 I process and generate digital signal in the standards 480i, 480p, 576i, 576p, 720p, 1080i, 1080p. Supported media file formats: MP3, WMA, MPEG4, MKV, JPEG.
The power of the acoustic system of sound 6 W (2x3 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 35 watts.
Overall dimensions: With stand 458x350x145 mm, Without stand 458x310x38 mm.
The mass of the TV: 2.5 kg.
Attention! The BB18 LEM1949DT LED TV panel HT185WX3-100 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.
