Technical description and composition of the BBK LEM3241FDT TV, type of panel and applicable modules. The composition of the modules.BBK LED
Model: LEM3241FDT
Chassis / Version: T.MSD309.9B
Panel: 32 inch
Power Supply (PSU): AY068D-4SF04
MainBoard: T.MSD309.9B 10345
IC MainBoard: CPU: MSD309BT-Z1, FLASH: GD25Q32
Tuner: XDTT-6F1C / T1146
Technical Specifications LEM3241FDT
BBK LEM3241FDT
General repair guidelines for TV LCD LED
Repair of electronic devices, including the BBK LEM3241FTD TV, it is advisable to start with an external examination of its external and internal elements. Specific external damage to some elements can sometimes indicate further actions to determine the malfunction of the TV and localize the defect before the necessary measurements are taken. In some cases, faulty elements can be seen with the naked eye, for example, charred resistors or swollen metal-ceramic capacitors, or electrolytic in rectifier filters. Ring cracks formed in the soldered terminals of transformers or heating elements of the circuit are also frequent sources of many malfunctions with a variety of external manifestations.
AY068D-4SF04 power module malfunctions can be expressed in different ways, for example, BBK LEM3241FTD does not turn on at all and the control lamps on its front panel do not light up and do not blink, there are no signs of operability. It should be noted that with the same external manifestations, the processor power regulator (converter) may be faulty. It is advisable to start the troubleshooting of the power supply module by checking the state of the electrolytic capacitors of the rectifier filters and the mains fuse. Defective capacitors should be replaced. If the mains fuse is broken, it is necessary to check first of all the power semiconductor elements - rectifier diodes and transistors, which are often found in such a state of breakdown.
Power switches in switching power supplies (SMPS) fail extremely rarely for no reason and, if they are broken, it is necessary to look for a malfunction in the stabilization circuits by checking electrolytic capacitors, semiconductor devices, and resistors in the primary circuit. The cause may be a malfunction of the PWM controller chip, which can only be checked by replacing it with a new or obviously working one.
Sometimes the BBK LEM3241FTD 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 converter for the panel backlight LEDs, or a break 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 the power supply unit (power supply unit).
In most cases of lack of backlight, it becomes necessary to disassemble the panel in order to check the LEDs, connectors, loops and all contact connections. If one or several LEDs does not work in one line, therefore, they are broken and should be replaced.
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.
Diagnostics and repair of the motherboard T.MSD309.9B 10345 is carried out by checking the operability of the stabilizers or power converters of the module chips. In some cases, a software update is required.
In cases of attempts to repair the MB (SSB) board, it is necessary to check the health of its elements - CPU: MSD309BT-Z1, FLASH: GD25Q32 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).
In cases where there is no tuning to the local television channels, make sure that the voltage of the varicaps (30-33V) and other supply voltages on the terminals of the tuner XDTT-6F1C / T1146 are present.
We recommend the owners of the LEM3241FTD TV for repair only to qualified specialists with experience! Self-repair attempts without the appropriate knowledge and skills can lead to serious negative consequences!
SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> Chassis MSD309B Schematic diagram
FIRMWARE FOR SPI FLASH -----------> BBK LEM3241FDT, Main: T.MSD309.9B 10345
The appearance of MainBoard T.MSD309.9B is shown in the figure below:T.MSD309.9B
MainBoard T.MSD309.9B uses the MSD309B processor, DDRAM random access memory (RAM) in BGA version and SPI Flash ROM type 25Q32 (4Mb).
It is advisable to start the repair of the motherboard by checking the voltage converters and linear stabilizers necessary to provide power to the nodes in the operating and standby modes. The processor core is powered by + 1.5V. Also, the processor voltage requires + 2.5V and + 3.3V.
If the display backlight is OK and there is no image, it is necessary to check the panel power (depending on the type, + 5V or + 12V), which is more convenient to measure directly on the LVDS connector. If, in the presence of all the supply voltages, the TV does not enter the operating mode, does not respond to the Remote Control and control buttons, you should update the SPI Flash firmware.
T.MSD309.9B can be used in TVs:
BBK LEM3242DT (Panel LC320EXN SDA1), BBK LEM3241FDT (Panel 32 дюйма), BBK LEM2687FDT (Panel V260H1-LE1), IZUMI TLE32D400B (Panel V315H3-LE4), SUPRA STV-LC3245LF (Panel TC-315F1H2), SUPRA STV-LC39T820FL (Panel TC390FP01-B), SUPRA STV-LC46T810FL (Panel 1080p Full HD 1920x1080), SUPRA STV-LC39T810FL (Panel TC390FP01-A).
Main features of the BBK LEM3241FDT device:
Installed matrix (LED-panel) 32 inches.
The formation of the necessary supply voltages for all nodes of the BBK LEM3241FDT TV is carried out by the power module AY068D-4SF04, or its analogs.
MainBoard - the main board (motherboard) is a module T.MSD309.9B, using CPU chips: MSD309BT-Z1, FLASH: GD25Q32 and others.
The tuner XDTT-6F1C / T1146 provides the reception of television programs and tuning to channels.
BBK LEM3241FDT LED TV with 32 ”32” (81 cm) diagonal LCD display in 16: 9 format. The required screen brightness of 450 cd / m² is provided by LED backlighting. The ratio of maximum brightness to minimum (contrast) is 6000: 1 This model uses side illumination from Edge LEDs.The design and technical capabilities of the TV include watching programs and movies in high quality HD with a resolution of 1920x1080 pixels in graphic resolution according to the standard 1080p (Full HD). Input high-frequency or video signal It can be processed in analogue 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, DivX, 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 x3, USB. An output for connecting headphones is provided. 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, 1920x1080. 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 80 watts.
Overall dimensions: With stand 780x546x205 mm, Without stand 780x491x46 mm.
Mass of the TV: 8.15 kg.
Attention! The 32-inch panel of the BBK LEM3241FDT 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.
