Technical description and composition of the BBK 32LEM-3002 TV, type of panel and applicable modules. The composition of the modules.BBK LED
Model: 32LEM-3002 / T2C
Chassis / Version: E309B-Y2-F0
Panel: SK32M32H
LED driver (backlight): integrated into MainBoard
PWM LED driver: BIT3251
MOSFET LED driver: ME15N10
Power Supply (PSU): integrated into MainBoard
PWM Power: L7535
MOSFET Power: FS4N60F
MainBoard: E309B-Y2-F0
IC MainBoard: MSD309BT, BIT3251 (8), RT7237AN (8), MSB101A. Win 25Q64FVSIG
Tuner: TDA18273
Specifications 32LEM-3002 / T2C
BBK 32LEM-3002
General repair guidelines for TV LCD LED
Possible manifestations of defects
- The BBK 32LEM-3002 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 common power source, the AC / DC voltage converter, which is combined with the elements of the main board E309B-Y2-F0, is often faulty. It is necessary to measure its output supply voltage, and in case of their absence, check the serviceability of the power switches (FS4N60F) of the converters and rectifier diodes for the probability of breakdown in PN semiconductor junctions.
In case of any breakdowns in the secondary circuits, the converter can operate in emergency short circuit mode, and during short circuit in the power elements of the primary circuit, the mains fuse or the current sensor at the source of the key more often 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) L7535, in the absence of external damage and short circuit between the terminals, are checked by replacing with obviously working ones.
- There is no image, but there is sound, it reacts to the remote control. Or the image appears when you turn it on and immediately disappears
The most likely in these cases is a malfunction of the LED backlight. The reason can be both in the power supply of the LEDs, in their serviceability (breakdown or breakage), as well as in the violation of the contact connections of the LED strips.
It is impossible to detect a break in the LED line without disassembling the panel with a simple multimeter. The LEDs are connected in series and to open their transitions, a voltage of several tens of volts is required. Ideally, a current source is suitable for such purposes. You can open the panel and check each LED separately. Typically, Chinese multimeters light up a single 3-volt LED, if you connect the probes in the forward direction to it (red probe to the anode, black to the cathode). In dual 6-volt LEDs, the PN junction of its emergency zener diode can serve as an indicator of health. In the event of a LED malfunction, its zener diode will either be cut off or broken into short-circuit.
- The indicator blinks or lights constantly, the TV does not turn on, does not respond to the remote control.
Repair or diagnostics of the E309B-Y2-F0 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). If it is not possible to replace the MB board (SSB), you need to check the health of its elements - BIT3251 (8), RT7237AN (8), MSB101A. Win 25Q64FVSIG. Defective components should be replaced.
Attention! For users and owners of 32LEM-3002 TVs who do not have the appropriate qualifications, knowledge and experience, we categorically do not recommend attempting self-repair in order to avoid negative consequences that could lead to complete non-repairability of the device.
SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> BBK 24LEM-5093 Chassis E309B-Y2-F0
Service Manual with Schematic Diagram 27 pages 2009 for the 28LEM-3002/T2C, 32LEM-3002/T2C
The appearance of the MainBoard E309B-Y2-F0 is shown in the figure below:E309B-Y2-F0
E309B-Y2-F0 can be used in TVs:
BBK 24LEM-5093/FT2C (Panel LC230EUE SEA1), BBK 32LEM-3002/T2C (Panel SK32M32H).
Main features of the BBK 32LEM-3002 device:
Installed matrix (LED-panel) SK32M32H.
To power the backlight LEDs, a converter is used, combined with the main board E309B-Y2-F0, controlled by the BIT3251 PWM controller. As the power elements of the LED driver, keys of the type ME15N10 are used.
The power module is combined with the MainBoard and is made according to the flyback AC / DC voltage converter circuit using L7535 microcircuits and power switches of the FS4N60F type.
MainBoard - the main board (motherboard) is an E309B-Y2-F0 module, using microchips MSD309BT, BIT3251 (8), RT7237AN (8), MSB101A. Win 25Q64FVSIG and others.
The TDA18273 tuner provides television reception and channel tuning.
BBK 32LEM-3002 / T2C LED TV with SK32M32H LCD, 32 "(81 cm) diagonal, 16: 9 format. The required screen brightness of 300 cd / m² is provided by LED backlighting. The ratio of maximum brightness to minimum (contrast) is 2000: 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 systems PAL, SECAM , NTSC. Graphic The digital signal is processed and generated in the standards 480i, 480p, 576i, 576p, 720p, 1080i, 1080p. Supported media file formats: MP3, WMA, MPEG4, DivX, MKV, JPEG. Stereo sound is realized by two built-in speakers. An audio processing system is used. NICAM STEREO.
The external interface (communication with other devices) is supported by standard input and output connectors: antenna input (RF), AV, audio x2, 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, 1920x1080. The digital tuner is capable of receiving television channels in the DVB-T MPEG4, DVB-C MPEG4, DVB-T2 standards.
The power consumed by the TV in the operating mode from the network is 75 watts.
Overall dimensions: With stand 749x511x210 mm, Without stand 749x459x75 mm.
TV Weight: 5.8 kg.
Attention! The panel of the SK32M32H BBK 32LEM-3002 / 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.
