Technical description and composition of the BBK 32LEM-1037 TV, type of panel and applicable modules. The composition of the modules.BBK LED
Model: 32LEM-1037 / TS2C
Chassis / Version: RR52CI.818A
Panel: ST3151A04-8 Ver2.1
T-CON: ST3151A04-5-XC-6
LED driver (backlight): integrated into MainBoard
PWM LED driver: BIT3267
MOSFET LED driver: 15N10
Power Supply (PSU): integrated into MainBoard
PWM Power: OB2273C
MOSFET Power: TO-252
MainBoard: RR52CI.818A
IC MainBoard: CPU: RDA512C, SPI Flash: MX25L6436F, AUDIO: RDA3118
Tuner: RDA5160, RDA5815M
Specifications 32LEM-1037 / TS2C
BBK 32LEM-1037
General repair guidelines for TV LCD LED
Possible malfunctions
- The BBK 32LEM-1037 TV does not turn on, does not respond to the remote control and the control panel buttons, does not light up or blink indicators.
The malfunction in such cases, first of all, should be sought in the power elements of a switching power supply (IIP) - a network voltage converter (AC / DC), which in this TV model is combined with the MainBoard RR52CI.818A main board. In the absence of the necessary supply voltages in the secondary circuits of the converters, it is necessary to check the power switches (TO-252) and rectifier diodes for a possible partial or complete breakdown.
In case of breakdowns in the secondary circuits, the converter can operate in a short circuit mode, and during a short circuit in the elements of the primary circuit, the mains fuse usually breaks.
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) OB2273C, if they do not have visible damage to the case and open short circuit between the terminals, are usually checked by replacement.
- There is no image, the screen is black, there is sound, with external illumination of the screen, you can sometimes see barely noticeable outlines of the image.
In some of these cases, the malfunction is caused by a lack of backlighting on the display. The reason can sometimes be in the power of the LEDs, but more often in their malfunction (breakdown or break), sometimes 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 indicator on the front panel blinks, the TV does not turn on in the operating mode, it does not respond to the remote control.
Repair or diagnostics of the RR52CI.818A 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). Sometimes they require checking or replacing (if necessary) the elements of the MainBoard - CPU: RDA512C, SPI Flash: MX25L6436F, AUDIO: RDA3118. In cases where the BGA processor is used, its malfunction is usually detected by the local heating method.
Before changing the RDA5815M 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 pins and check the software 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-1037 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!
SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> BBK 32LEM-1037 Chassis RR52CI.818A
FIRMWARE FOR SPI FLASH -----------> BBK 32LEM-1037/TS2C, Main: RR52CI.818A, Panel: ST3151A04-8 Ver2.1
Schematic Diagrams 10 pages of 2017 on the 32LEM-1037 / TS2C
The appearance of the MainBoard RR52CI.818A is shown in the figure below:RR52CI.818A
Main features of the BBK 32LEM-1037 device:
Installed matrix (LED-panel) ST3151A04-8 Ver2.1.
The matrix control uses the Timing Controller (T-CON) ST3151A04-5-XC-6.
To power the backlight LEDs, a converter is used, combined with the main board RR52CI.818A, controlled by the BIT3267 PWM controller. As power elements of the LED driver, keys of the 15N10 type are used.
The power module is combined with the MainBoard and is made according to the flyback AC / DC voltage converter circuit using OB2273C microcircuits and TO-252 type power switches.
MainBoard - the main board (motherboard) is an RR52CI.818A module, using CPU chips: RDA512C, SPI Flash: MX25L6436F, AUDIO: RDA3118 and others.
Tuner RDA5160, RDA5815M provides the reception of television programs and tuning to channels.
BBK 32LEM-1037 / TS2C LED TV with ST3151A04-8 LCD display, 32 "(81 cm) diagonal size in 16: 9 format. The required screen brightness of 250 cd / m² is provided by LED backlight LED. The ratio of maximum brightness to minimum ( contrast ratio) is 3000: 1. LED display technology is implemented in the model’s display technology. High quality HD images can be viewed at 1366x768 pixels in the standard 720p graphic decomposition (HD Ready). Supported media file formats: MP3, WMA, MKV, JPEG .
The power of the sound system 16 W (2x8 W) provides 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. The digital tuner is capable of receiving television channels in the DVB-T MPEG4, DVB-C MPEG4, DVB-T2, DVB-S2 standards.
Overall dimensions: With stand 737x495x206 mm, Without stand 737x438x83 mm.
The mass of the TV: 6.2 kg.
Attention! The ST3151A04-8 Ver2.1 panel of the BBK 32LEM-1037 / TS2C 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.
