Technical description and composition of the BBK 32LEM-1019 TV, panel type and applicable modules. The composition of the modules.BBK LED
Model: 32LEM-1019 / T2C
Chassis / Version: JUC7.820.00130484
Panel: C320X15-E6-H (G2)
T-CON: MT3151A05-5-XC-5
LED driver (backlight): integrated into MainBoard
PWM LED driver: MP4012
MOSFET LED driver: TO-252
Power Supply (PSU): integrated into MainBoard
PWM Power: NCP1251A (PWM SOT23-6)
MOSFET Power: 70R600P
MainBoard: JUC7.820.00130484
IC MainBoard: CPU: MSMHFK, SPI FLASH: GD25Q32
Tuner: CH DM121 C816RH
Specifications 32LEM-1019 / T2C
BBK 32LEM-1019
General repair guidelines for TV LCD LED
Possible manifestations of defects
- The BBK 32LEM-1019 TV does not turn on. There are no signs of operability. The indicators on the front panel do not light up and do not blink, the TV does not respond to the control buttons.
The malfunction in such cases should be sought primarily in the circuit of a switching power supply (IIP) - a network voltage converter (AC / DC), which is combined with the MainBoard JUC7.820.00130484 mainboard in this model. It is necessary to verify the presence of its output voltages and, in case of their complete absence, check the power switches (70R600P) and rectifier diodes for a probable short circuit.
In case of breakdowns in the secondary circuits, the converter can operate in a short circuit mode, and during short circuit in the 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) NCP1251A (PWM SOT23-6), 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.
In such cases, the most likely malfunction of the LED backlight elements. Often the cause of the malfunction is the lack of current in the LED circuit, for example, an open or short circuit, or a violation of the contact connections of the connectors.
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 turn on, the indicator indicates standby or operating mode, or blinks.
Repair or diagnostics of the JUC7.820.00130484 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). Board repair and replacement of CPU chips: MSMHFK 9206B, SPI FLASH: 25Q64 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.
Before changing the CH DM121 C816RH tuner, if it is not possible to tune to television channels, make sure that there are supply voltages that must be measured at the corresponding tuner terminals and checked for correctness. The pulses of the data exchange of the tuner with the processor can be controlled by an oscilloscope
Owners and users of the BBK 32LEM-1019 TV should 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!
FIRMWARE FOR SPI FLASH -----------> BBK 32LEM-1019/T2C, Main: JUC7.820.00130484, Panel: C320X15-E6-H (G2)
The appearance of the MainBoard JUC7.820.00130484 is shown in the figure below:JUC7.820.00130484
Main features of the BBK 32LEM-1019 device:
Installed matrix (LED-panel) C320X15-E6-H (G2).
The matrix control uses the Timing Controller (T-CON) MT3151A05-5-XC-5.
To power the backlight LEDs, a converter is used, combined with the main board JUC7.820.00130484, controlled by the MP4012 PWM controller. As power elements of the LED driver, keys of the TO-252 type are used.
The power module is combined with the MainBoard and is made according to the flyback AC / DC voltage converter circuit using NCP1251A microcircuits (PWM SOT23-6) and power switches of the 70R600P type.
MainBoard - the main board (motherboard) is a JUC7.820.00130484 module, using CPU chips: MSMHFK, SPI FLASH: GD25Q32 and others.
The CH DM121 C816RH tuner provides TV reception and channel tuning.
BBK 32LEM-1019 / T2C LED TV with C320X15-E6-H LCD, 32 "(81 cm) diagonal of 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 3000: 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 of graphic decomposition 720p (HD Ready). The input high-frequency or video signal can be processed in analog PAL, SECAM, NTSC systems. Digital signal processing and generation takes place in the standards 480i, 480p, 576i, 576p, 720p, 1080i Supported media file formats: MP3, WMA, MPEG4, MKV, JPEG.
The power of the sound system 16 W (2x8 W) provide two speakers. It uses a NICAM stereo signal processing system and Sound Surround.
The external interface (communication with other devices) is supported by standard input and output connectors: antenna input (RF), AV, component, 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. The digital tuner is capable of receiving television channels in the DVB-T MPEG4, DVB-C MPEG4, DVB-T2 standards.
Overall dimensions: With stand 731x469x197 mm, Without stand 731x431x83 mm.
Attention! The C320X15-E6-H (G2) panel of the BBK 32LEM-1019 / T2C 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.