Technical description and composition of the BBK LEM2649HD TV, panel type and applicable modules. The composition of the modules.BBK LED
Model: LEM2649HD
Chassis / Version: MSTV3208-ZC01-01
Panel: V260H1-LE7 Rev C1
T-CON: V260H1-XC03
LED driver (backlight): TV2631-ZC02-01 (B)
PWM LED driver: RT8566
MOSFET LED driver: B6010D
Power Supply (PSU): TV2632-ZC02-02 (A)
PWM Power: NCP1250
MainBoard: MSTV3208-ZC01-01
IC MainBoard: CPU: MST6M48RHS-LF-Z1, SPI FLASH: 25L32 (MXIC). Sound: TDA1517P
Tuner: F21WT-3BAR-E
Control: RC3229
Technical Specifications LEM2649HD
BBK LEM2649HD
General repair guidelines for TV LCD LED
Repair of electronic equipment usually begins with its external inspection and diagnosis of the malfunction. In this case, you should examine all the internal components of the BBK LEM2649HD TV, as well as the external elements of the housing. Often, based on certain external signs, it may be possible to draw certain conclusions about the reasons for the failure of certain elements of the circuit even before the necessary measurements are made, which will determine the further algorithm for troubleshooting and localizing the defect. If ring cracks are detected in the soldering of the terminals of the elements or dangling connecting tracks, swollen capacitors or charred resistors - all this can be characteristic signs of the causes or consequences of an already known typical malfunction.
If the BBK LEM2649HD does not turn on, no control lights on the front panel light up or blink, therefore, there is a very high probability of a malfunction of the TV2632-ZC02-02 (A) power supply module. In some cases, only the processor power regulator may be faulty. When repairing the power supply, it is advisable to start the diagnostics by checking the mains fuse and the electrolytic capacitors of the filters of the converter secondary rectifiers. In the event of a fuse breaking, the reason should be sought in the power semiconductor elements of the pulse converter of the main power supply. First of all, it is necessary to check the diodes of the bridge of the rectifier of the mains voltage and the power switch (s) of the converter.
It should be remembered that in the practice of repair, usually the power switches in switching power supplies (SMPS) do not fail due to their poor quality and, in such cases, it is necessary to look for the cause that led to a malfunction and provoked a breakdown of the key. Most often, the culprits of the accident are dried electrolytic capacitors or dangling resistors in the primary circuit, or the NCP1250 PWM controller chip itself may be faulty. It is also necessary to check all the semiconductor elements of the stabilization circuit in the primary and secondary circuits.
If, when you turn on the TV, the image appears and immediately disappears, or is initially absent when you turn on, but the sound is there and other functions work, there is a high probability of a malfunction of the LED driver (power converter for the backlight LEDs of the V260H1-LE7 Rev C1 panel). In such cases, the general power module is also subject to verification, in which the electrolytic capacitors of the rectifier filter supplying the LED driver should be checked.
Often in the absence of backlighting, disassembling the panel is required. It is necessary to check the serviceability of the transitions of the LEDs, as well as the reliability of the contact connections in the lines and connectors.
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.
Repair of the MSTV3208-ZC01-01 motherboard 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.
In cases of complex repairs of MB (SSB) and in the presence of the necessary skills and equipment, sometimes it may be necessary to replace its CPU chips: MST6M48RHS-LF-Z1, SPI FLASH: 25L32 (MXIC). Sound: TDA1517P and other possible malfunctioning components. Malfunctions associated with the application of BGA soldering technologies are usually easily diagnosed by the heating method.
If there is no reception of television channels, but the TV is working properly from external devices, first of all it is necessary to check the voltage of the varicap tuner F21WT-3BAR-E, which is usually within 30-33V, as well as other supply voltages at the terminals of the tuner.
Attention to users! Independent repair of the BBK LEM2649HD TV without the appropriate qualifications and experience can lead to its complete non-repairability!
FIRMWARE FOR SPI FLASH -----------> BBK LEM2649HD, Main: MSTV3208-ZC01-01, Panel: V260H1-LE7 Rev C1
Schematic Diagrams 7 pages 2009 on model LEM2649HD, LEM3248SD
To reduce the backlight current in LED drivers with an RT8566 controller, it is necessary to proportionally increase the resistance of the resistor from terminal 2 (RISET) to the housing. The current in each channel is determined from the 543.6 / Rset ratio.
Repair MainBoard
The appearance of the MainBoard MSTV3208-ZC01-01 is shown in the figure below:
The motherboard MSTV3208-ZC01-01 is made using the multifunction microprocessor MST6M48RHS-LF, which includes a scaler (graphic controller-scaler). To organize the work of the processor, the external RAM H5PS5162GFR 512Mb DDR2 SDRAM in BGA version and SPI FLASH 25Q32 (4Mb) are used. To provide power to the processor core, a DC / DC converter with an output voltage of 1.2V is used, assembled on the basis of the MP1482 PWM controller. Other nodes of the processor are powered by linear voltage stabilizers 2.5V, 3.3V. 1.8V voltage is used to power the DDR RAM, 3.3V is needed for the SPI FLASH ROM.
It is advisable to start the MainBoard repair by checking the supply voltage in Stand-by mode 5V and 3.3V. In operating mode, check the operation of all linear stabilizers and the DC / DC converter. If there is a backlight and there is no image, you need to check the power of the 5V or 12V panel (depending on the type of LCD panel), which should be present directly on the LVDS connector.
If the indicator signals Stand-by mode and does not respond to the remote control and control buttons, it is recommended to update the SPI Flash software. Taking into account the glitchiness of Winbond SPI chips, it is advisable to replace them with new ones in case of software failures.
MSTV3208-ZC01-01 can be used in TVs:
BBK LEM2648SD (Panel V260B1-LE9 revC1), BBK LEM3248SD (Panel HV320WX2-130 (B3)), BBK LMP3229HDU Ver1 (Panel T315HW02 v.7), BBK LMP3229HDU Ver2 (Panel T315HW04 V7), BBK LEM2649HD (Panel V260H1-LE7 Rev C1), MYSTERY MTV-2607W (Panel V260H1-L05), MYSTERY MTV-3206 (Panel T315XW04 V.7), MYSTERY MTV-3207W (Panel V315B3-L04 rev.c1), MYSTERY MTV-3213LW (Panel T315XW04 V.8), MYSTERY MTV-2220LW (Panel CLAA215FA15), MYSTERY MTV-3207W (Panel HV320WX2-110), MYSTERY MTV-2614LW (Panel V260H1-LE6), MYSTERY MTV-3208WH (Panel V315H1-L02), MYSTERY MTV-2411LW (Panel V236H1-LE5 Rev.C1), MYSTERY MTV-2618LW (Panel V260B2-LE11), MYSTERY MTV-2211LW (Panel CLAA215FA10), MYSTERY MTV-2414LW (Panel V236H1-L01), MYSTERY MTV-2611LW (Panel V260H1-LE6 Rev.C1), MYSTERY MTV-3206W (Panel T315XW03 V.3), MYSTERY MTV-3211LW (Panel V315H3-LE2 Rev. C1), MYSTERY MTV-4207WH (Panel T420HW09 V.1), MYSTERY MTV-1921LD (Panel HT185WX3).
The appearance of the power supply
Main features of the BBK LEM2649HD device:
Installed matrix (LED-panel) V260H1-LE7 Rev C1.
The matrix control uses the Timing Controller (T-CON) V260H1-XC03.
To power the backlight LEDs, the TV2631-ZC02-01 (B) LED driver is used, controlled by the RT8566 PWM controller. As power elements of the LED driver, keys of the type B6010D are used.
The necessary supply voltages for all nodes of the TV BBK LEM2649HD are generated by the TV2632-ZC02-02 power module, or its analogs using NCP1250 microcircuits.
MainBoard - the main board (motherboard) is an MSTV3208-ZC01-01 module, using CPU chips: MST6M48RHS-LF-Z1, SPI FLASH: 25L32 (MXIC). Sound: TDA1517P and others.
The F21WT-3BAR-E tuner provides television reception and channel tuning.
Information from an alternative source:
BBK LEM2649HD
Panel Type (Matrix): V260H1-LE7 Rev. C1
Motherboard: MSTV3208-ZC01-01, Micom MST6E48RHS-LF-Z1, Flash S25FL032KIF, X5DV330, Audio YD1517, Tuner: F21WT-3BAR-E
T-con: V260H1-XC03
LED Driver: TV2631-ZC02-01 (B) P / N: 303C2631062, RT8566
PSU: TV2632-ZC02-02 (A), U102 63B29
Remote control: RC3229
BBK LEM2649HD LED TV with V260H1-LE7 LCD, 26 "(66 cm) diagonal size of 16: 9 format. The required screen brightness of 350 cd / m² is provided by LED backlighting. The ratio of maximum brightness to minimum (contrast) is 800 : 1. This model uses Edge LED backlighting. The design and technical capabilities of the TV include watching programs 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 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, Xvid, DivX, 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 power consumed by the TV in the operating mode from the network is 55 watts.
Overall dimensions: With stand 640x466x180 mm, Without stand 640x420x40 mm.
TV Weight: 5.4 kg.
Attention! The BBK LEM2649HD LED TV panel V260H1-LE7 Rev C1 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.