Technical description and composition of the BBK LEM2685DTG TV, type of panel and applicable modules. The composition of the modules.BBK LED
Model: LEM2685DTG
Chassis / Version: MSDV3213-ZC01-01
Panel: V260H1-LE8 REV.C1
LED driver (backlight): integrated into MainBoard
PWM LED driver: AP3039AM-G1, AP3608EM-G1
MOSFET LED driver: B6010D
Power Supply (PSU): integrated into MainBoard
PWM Power: PWM SOT23-6
MainBoard: MSDV3213-ZC01-01
IC MainBoard: Cpu: MSD309PX-LF, Spi Flash: MX25L6406
Tuner: DT58WT-3RB-E
Technical Specifications LEM2685FDTG
BBK LEM2685DTG
General repair guidelines for TV LCD LED
Possible malfunctions
- The BBK LEM2685DTG TV does not turn on, does not respond to the remote control and buttons on the control panel, does not light up or blink indicators.
In such cases, the main power source, the AC / DC voltage converter, which is combined with the MainBoard MSDV3213-ZC01-01, may turn out to be faulty. It is necessary to measure the output voltages in its secondary circuits, and if they are completely absent, it is necessary to check the serviceability of power switches and rectifier diodes for possible breakdown (short circuit).
In case of any breakdown of semiconductors in the secondary circuits, the converter can usually work normally in emergency short circuit mode. There are no output voltages. And with a short circuit in the power elements of the primary circuit, as a rule, the mains fuse breaks and less often the current sensor at the source of the key.
Breakdown of power switches (MosFet) in pulsed sources is sometimes caused by malfunctions of other circuit elements, for example, in circuits supplying a PWM controller, frequency-setting or damper ones, as well as in negative feedback circuits (OOS) of stabilization. PWM controllers (PWM) PWM SOT23-6, if they do not have visible damage to the case and open fault between the terminals, are usually checked by replacement.
- There is no image, there is sound, it is responding to the remote control. Or immediately after turning on for a second, the image may appear and immediately disappear.
In most of these cases, a malfunction is detected in the nodes and backlight elements of the LED panel. The reason can be both in the power 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 TV does not enter the operating mode, does not respond to the remote control. The indicator on the front panel lights constantly or blinks.
Repair or diagnostics of the motherboard MSDV3213-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 - CPU: MT5TU32M160G-AC, Flash: MX25L3206E, AP3608EM-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 the TV works normally from external devices, but does not tune into television channels, the DT58WT-3RB-E tuner may be malfunctioning. In such cases, first of all, you should make sure that there are supply voltages at its corresponding conclusions. It is also necessary to make sure that the tuner and processor can exchange data via the I2C bus. Sometimes the cause of the inoperability of the tuner may be a software failure.
Once again, remind users! Attempts to self-repair a BBK LEM2685DTG TV without the appropriate qualifications and necessary experience can lead to its complete non-repairability!
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.
Service Manual with Schematic Diagram 62 pages 2010 on LEM2685FDTG
The appearance of the MainBoard MSDV3213-ZC01-01 is shown in the figure below:MSDV3213-ZC01-01
MSDV3213-ZC01-01 can be used in TVs:
BBK LEM1981 (Panel V185B1-L17 Rev.C1 CMO), BBK LEM2481FDT (Panel V236H1-LE5), BBK LEM2682 LEM2682DT (Panel V260B2-LE11 Rev.C1), BBK LEM2281FDT (Panel CLAA215FA10), BBK LEM2685DTG (Panel V260H1-LE8 REV.C1), MYSTERY MTV-2620LW (Panel V260B2-LE3 Rev.c1).
Main features of the BBK LEM2685DTG device:
Installed matrix (LED-panel) V260H1-LE8 REV.C1.
To power the backlight LEDs, a converter is used, combined with the main board MSDV3213-ZC01-01, controlled by the AP3039AM-G1, AP3608EM-G1 PWM controller. As power elements of the LED driver, keys of the type B6010D are used.
The power module is combined with the MainBoard and is made according to the flyback AC / DC voltage converter circuit using PWM SOT23-6 microcircuits.
MainBoard - the main board (motherboard) is an MSDV3213-ZC01-01 module, using Cpu chips: MSD309PX-LF, Spi Flash: MX25L6406 and others.
Tuner DT58WT-3RB-E provides the reception of television programs and tuning to channels.
BBK LEM2685FDTG LED TV with V260H1-LE8 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 800 : 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 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, 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 55 watts.
Overall dimensions: With a support 652x451x180 mm, Without a support 652x421x39 mm.
TV Weight: 7.5 kg.
Attention! Panel V260H1-LE8 Rev. The C1 LED TV BBK LEM2685FDTG 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.