Technical description and composition of the BBK 50LEM-1056 TV, panel type and applicable modules. The composition of the modules.BBK LED
Model: 50LEM-1056
Chassis / Version: CV512H-U50
Panel: CX500DLEDM REV.C7 LE-5019N
T-CON: V500HJ1-PE8
LED driver (backlight): integrated into MainBoard
Power Supply (PSU): integrated into MainBoard
MainBoard: CV512H-U50
IC MainBoard: SPI 25Q64 AUDIO: RDA3118E28
Tuner: CDT-9NT372-RD60 & CDT-9NS161-RD41
Specifications 50LEM-1056 / FTS2C
BBK 50LEM-1056
General repair guidelines for TV LCD LED
Possible malfunctions
- BBK 50LEM-1056 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 CV512H-U50 board. It is necessary to measure its secondary output voltages, and if they are absent, check the power switches and rectifier diodes in the converters for a short circuit.
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.
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 microcircuits are usually checked by replacement with new ones, or obviously working.
- 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.
Often in such cases, there is no LED backlight. The reason for this may be a break in the LED circuit, or a problem in stabilizing their power supply.
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 CV512H-U50 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). Often, the MB (SSB) card must be replaced in case of complex malfunctions that are difficult to detect. When trying to repair, you should check its elements - SPI 25Q64 AUDIO: RDA3118E28 and replace failed chips with new ones. Some malfunctions may be due to the use of BGA soldering technologies in modern Main Board technologies. Typically, such defects are detected by local heating of the chip.
In the absence of tuning to the channels of on-air or cable television, you should make sure that the software is correct, as well as in accordance with the ratings of the supply voltages on the terminals of the tuner CDT-9NT372-RD60 & CDT-9NS161-RD41. It is also necessary to check the presence of pulses of data exchange between the tuner and the processor via the I2C bus using an oscilloscope.
It should be remembered! Attempts to independently repair the BBK 50LEM-1056 TV, in the absence of the necessary qualifications and experience, are categorically not recommended and are fraught with negative consequences, up to the complete non-repairability of the device!
FIRMWARE FOR SPI FLASH -----------> BBK 50LEM-1056 50LEM-1056/FTS2C, Main: CV512H-U50, Panel: CX500DLEPM REV.C7 LE-5019N
The appearance of the MainBoard CV512H-U50 is shown in the figure below:CV512H-U50
Main features of the BBK 50LEM-1056 device:
Installed matrix (LED-panel) CX500DLEDM REV.C7 LE-5019N.
The matrix control uses the Timing Controller (T-CON) V500HJ1-PE8.
To power the backlight LEDs, a converter is used, combined with the main board CV512H-U50.
The power module is combined with the MainBoard and is made according to the flyback AC / DC voltage converter circuit.
MainBoard - the main board (motherboard) is a CV512H-U50 module using SPI 25Q64 AUDIO chips: RDA3118E28 and others.
The tuner CDT-9NT372-RD60 & CDT-9NS161-RD41 provides the reception of television programs and tuning to channels.
Brand: BBK, Model: 50LEM-1056 / FTS2C.
Briefly from the TV: LCD, LED backlight, 50 ", 1920x1080, 1080p Full HD, there is a satellite tuner, sound: 16W, HDMI connectors: 3.
Manufacturer: TELEBALT Kaliningrad, Kamskaya, 62. The assembly can be in the city of Guards, st. Station, 6 (PKV).
Developer: BBK Electronics LTD. China
The composition uses MainBoard CV512H-U50 and an LCD panel (matrix) CX500DLEPM REV.C7 (V500HJ1-PE8). The power supply is combined with the MainBoard.
BBK 50LEM-1056 / FTS2C LED TV with a CX500DLEPM LCD display, diagonal size 50 "(127 cm) 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) is 5000: 1. The LED display technology is implemented in the model’s display technology. Multimedia file s: MP3, WMA, MPEG4, DivX, MKV, JPEG.
The power of the sound speaker system 16 W (2x8 W) is provided by 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, VGA, HDMI x3, USB. An output for connecting headphones is provided. The digital tuner is capable of receiving television channels in the standards DVB-T MPEG4, DVB-C, DVB-T2, DVB-S2.
Overall dimensions: with stand 1131x705x202 mm, without stand 1131x659x97 mm.
Mass of the TV: 12.8 kg.
Attention! The CX500DLEPM REV.C7 (V500HJ1-PE8) panel of the BBK 50LEM-1056 / FTS2C 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.