Technical description and composition of the BBK LEM2687FDT TV, type of panel and applicable modules. The composition of the modules.BBK LED
Model: LEM2687FDT
Chassis / Version: T.MSD309.9B
Panel: V260H1-LE1
T-CON: V260H1-XC03
Power Supply (PSU): AY072D-4SF01
MainBoard: T.MSD309.9B 10345
IC MainBoard: CPU: MSD309BT-Z1, spi FLASH: 25Q32B
Tuner: XDTT-6F1C / T1146
Technical Specifications LEM2687FDT
BBK LEM2687FDT
General repair guidelines for TV LCD LED
Possible malfunctions
- BBK LEM2687FDT does not turn on and does not show any signs of performance at all. Does not blink indicators and does not respond to control buttons.
In such cases, the fault should be sought first in the power module AY072D-4SF01. In the absence of the necessary supply voltages in the secondary circuits of the converters, it is necessary to check the power switches and rectifier diodes for a possible partial or complete breakdown.
In case of breakdowns in the secondary circuits, the converter, as a rule, can emergency work in the short circuit mode, and during short circuit in the power 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. These can be circuits supplying the PWM controller, damping or frequency-setting circuits, or elements of OOS (negative feedback) in the stabilization circuit. PWM controllers (PWM), in the absence of external damage and short circuit between the terminals, are checked by replacing with obviously good ones.
- There is no image, but there is sound and reaction to the remote control. Or for a second, the image may appear immediately after switching on.
Often in such cases, there is no LED backlight. The reason for this may be a break in the LED circuit, or a problem in stabilizing their power supply.
When trying to detect a break in the LED lines, it should be taken into account that it is difficult to do this without disassembling the panel. For example, a current source is needed to open PN junctions connected in series.
- The indicator blinks or lights constantly, the TV does not turn on, does not respond to the remote control.
Repair or diagnostics of the T.MSD309.9B 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). Sophisticated MB board repair (SSB) is in some cases possible and practiced by repairmen. To do this, check and, if necessary, replace the CPU elements: MSD309BT-Z1, spi FLASH: 25Q32B. BGA chip malfunctions are usually easy to detect by warming up.
Before replacing the XDTT-6F1C / T1146 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
Attention to users! Independent repair of the BBK LEM2687FDT TV without the appropriate qualifications and the necessary experience can lead to its complete non-repairability!
Repair MainBoard
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 LEM2687FDT device:
Installed matrix (LED-panel) V260H1-LE1.
The matrix control uses the Timing Controller (T-CON) V260H1-XC03.
The formation of the necessary supply voltages for all nodes of the BBK LEM2687FDT TV is carried out by the power module AY072D-4SF01, or its analogues.
MainBoard - the main board (motherboard) is a T.MSD309.9B module, using CPU chips: MSD309BT-Z1, spi FLASH: 25Q32B and others.
The tuner XDTT-6F1C / T1146 provides the reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand : CMO
Model : V260H1-LE1
Type : a-Si TFT-LCD, Panel
Diagonal size : 26.0 inch
Resolution : 1920x1080, FHD
Display Mode : TN, Normally White, Transmissive
Active Area : 576x324 mm
Surface : Antiglare (Haze 25%), Hard coating (3H)
Brightness : 400 cd/m²
Contrast Ratio : 800:1
Display Colors : 16.7M , CIE1931 72%
Response Time : 1.5/3.5 (Tr/Td)
Frequency : 60Hz
Lamp Type : 13S6P WLED Without Driver
Signal Interface : LVDS (2 ch, 8-bit), 51 pins
Voltage : 12.0V
BBK LEM2687FDT LED TV with V260H1-LE1 LCD, 26 "(66 cm) diagonal, 16: 9 format. The required screen brightness of 400 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) provides 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, 1360x768, 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 60 watts.
Overall dimensions: With stand 658x489x205 mm, Without stand 658x429x55 mm.
The mass of the TV: 6.2 kg.
Attention! The BBK LEM2687FDT LED TV panel V260H1-LE1 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.
