Technical description and composition of the TV BBK 32LEM-1018, type of panel and applicable modules. The composition of the modules.BBK LED
Model: 32LEM-1018 / T2C
Chassis / Version: JUC7.820.00117550
Panel: C320X14-E12-H
LED backlight: 18 LED 3V
T-CON: MT3151A05-5-XC-5; CS11102, CS902, CS801, 4G32A
LED driver (backlight): integrated into MainBoard
PWM LED driver: MP4012
MOSFET LED driver: MDD14N25
Power Supply (PSU): integrated into MainBoard
PWM Power: PWM SOT23-6
MainBoard: JUC7.820.00117550
IC MainBoard: 9206B, 1533-DBN, 25Q64, TPS54428, RT9108NB
Tuner: CH DMI21-C812RH
Specifications 32LEM-1018 / T2C
BBK 32LEM-1018
General repair guidelines for TV LCD LED
Possible malfunctions
- BBK 32LEM-1018 does not turn on, the indicators on the front panel do not light or flash. The TV does not respond to the control buttons and the remote control.
In this case, first of all, you should check the operability of the main power source - AC / DC network voltage converter, all of whose elements are located on the MainBoard JUC7.820.00117550 board. In the absence of the necessary supply voltages in the secondary circuits of the converter, it is necessary to check the power switch and rectifier diodes for a possible 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.
The breakdown of Mos-Fet keys used in pulsed sources is often caused by malfunctions of other elements, for example, in the power supply circuit of a PWM controller, in frequency-setting or damping circuits, as well as in Negative Stabilization Feedback. PWM SOT23-6 microcircuits, in the absence of external damage and short circuits between the terminals, are checked by replacing with new ones, or obviously working.
- 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
As a rule, in such cases there is no display 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 should be remembered that it is not possible to determine the open circuit in the LED lines without disassembling the panels with a tester or multimeter without an additional device, for example, a current source. To open all PN junctions connected in series at once, a voltage of several tens of volts may be required. Then it is necessary to open the panel and check each LED separately with a multimeter. If the capabilities of your multimeter do not allow you to open the LED in the forward direction or dual LEd are used, then the PN junction of the emergency zener diode can indirectly serve as a health indicator. In case of LED-a failure, the zener diode PN junction will either be cut off or broken into short-circuit.
- The TV does not turn on, the indicator indicates standby or operating mode, or blinks.
Repair or diagnostics of the JUC7.820.00117550 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). Complex repair of MB (SSB) is possible only in the conditions of a service center with the necessary equipment. Testing or replacing elements 9206B, 1533-DBN, 25Q64, TPS54428, RT9108NB requires the necessary training and professional skills to repair modules at the component level. Problems associated with the use of BGA soldering technologies can sometimes be diagnosed by warming up.
Before replacing the CH DMI21-C812RH tuner, if there is no tuning for the channels, you must first check the software and the supply voltage at its terminals. It is also necessary to make sure that the tuner and processor can exchange data via the I2C bus
LED-driver Iout = 285 mA. If you remove the RP410 resistor 2.2 ohms, Iout = 157 mA, or remove the RP409 10 ohms, Iout = 256 mA.Once again, remind users! Attempts to self-repair a BBK 32LEM-1018 TV without the appropriate qualifications and necessary experience can lead to its complete non-repairability!
FIRMWARE FOR SPI FLASH -----------> BBK 32LEM-1018/T2C, Main: JUC7.820.00117550, Panel: C320X14-E12-H
The appearance of the MainBoard JUC7.820.00117550 is shown in the figure below:JUC7.820.00117550
JUC7.820.00117550 can be used in TVs:
BBK 32LEM-1018/T2C (Panel C320X14-E12-H), DEXP H32B7200C (Panel C320X14-E12-H(G3)), DEXP H32B7400C (Panel C320X14-E3-H (G7)), ERISSON 32LEC2500 (Panel M320X13-E2-B), TELEFUNKEN LED32S22T2 (Panel M320X13-E1-A).
Main features of the BBK 32LEM-1018 device:
Installed matrix (LED panel) C320X14-E12-H.
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 JUC7.820.00117550, controlled by the MP4012 PWM controller. As power elements of the LED driver, keys of the MDD14N25 type 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 a JUC7.820.00117550 module, using chips 9206B, 1533-DBN, 25Q64, TPS54428, RT9108NB and others.
The CH DMI21-C812RH tuner provides TV reception and channel tuning.
BBK 32LEM-1018 / T2C LED TV with C320X14-E12-H LCD, 32 "(81 cm) diagonal of 16: 9 format. The required brightness of the screen is 250 cd / m² thanks to 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. Skye processing and the formation of the digital signal is in 480i standards, 480p, 576i, 576p, 720p, 1080i, 1080p Supported multimedia file formats:. MP3, WMA, MPEG4, MKV, JPEG.
The power of the sound system 6 W (2x3 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, audio x2, component, VGA, HDMI x3, USB, optical. 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 730x487x208 mm, Without stand 730x430x89 mm.
Attention! The C320X14-E12-H panel of a BBK 32LEM-1018 / 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.
