Technical description and composition of the BBK 22LEM-1026 TV, type of panel and applicable modules. The composition of the modules.BBK LED
Model: 22LEM-1026 / FT2C
Chassis / Version: CV512L-B24
Panel: M215HGE-P02
T-CON: M215HGE-L21-X + C; G1584A, S26A 5519, DS962, NT71260FG-103, G1584A
LED driver (backlight): integrated into MainBoard
PWM LED driver: BIT3267
MOSFET LED driver: D4454
Power Supply (PSU): integrated into MainBoard
PWM Power: PWM SOT23-6
MainBoard: CV512L-B24 CV512L-B24-14-A1
IC MainBoard: SPI FLESH: 25Q64C, Sound: YD1517P
Tuner: CDT-9NT372-RF01
Control: RC-LEM100
Technical Specifications 49LEX-5048 / FT2C
BBK 22LEM-1026
General repair guidelines for TV LCD LED
Possible malfunctions
- The BBK 22LEM-1026 TV does not turn on, does not respond to the remote control and the control panel buttons, the indicators do not light or flash.
Usually, with such manifestations, the defect is caused by faulty elements in the power module, which in this model is combined with elements of the MainBoard CV512L-B24 main board. It is necessary to measure its secondary output voltages, and in case of their absence, check the serviceability of the power switches of the converters and rectifier diodes for a short circuit.
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.
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. It can be supply, damper circuits, or elements of OOS (negative feedback) stabilization. The reason for the breakdown of the power switch may also be PWM SW23-6 PWM. It is checked only by replacement with a known good one.
- There is no image, but there is sound and reaction to commands from the remote control. Or the image appears immediately after turning on and disappears.
Often in such cases, there is no 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 CV512L-B24 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 (SSB) card, you need to check the health of its elements - SPI FLESH: 25Q64C, Sound: YD1517P. Defective components should be replaced.
If the TV works normally from external devices, but does not tune into television channels, the tuner CDT-9NT372-RF01 may be malfunctioning. In such cases, first of all, you should make sure that there are supply voltages at its corresponding conclusions. It is also necessary to make sure that the tuner and processor can exchange data via the I2C bus. Sometimes the cause of the inoperability of the tuner may be a software failure.
Attention TV owners! Attempts at self-repair of BBK 22LEM-1026 are not recommended by the manufacturer and can lead to serious negative consequences!
The appearance of the MainBoard (CultraView) CV512L-B24 is shown in the figure below:CV512L-B24
CV512L-B24 can be used in TVs:
BBK 28LEM-1021 / T2C (Panel SV275SHD HX010403 X41), BBK 22LEM-1026 / FT2C (Panel M215HGE-P02), SUPRA STV-LC24T880WL (Panel HV236WHB-N00), SUPRA STV-LC22T880FL (Panel LC215DBA
Main features of the BBK 22LEM-1026 device:
Installed matrix (LED-panel) M215HGE-P02.
The matrix control uses the Timing Controller (T-CON) M215HGE-L21-X + C ;.
To power the backlight LEDs, a converter is used, combined with the main board CV512L-B24, controlled by the BIT3267 PWM controller. As the power elements of the LED driver, keys of the D4454 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 CV512L-B24 module, using microchips SPI FLESH: 25Q64C, Sound: YD1517P and others.
The tuner CDT-9NT372-RF01 provides the reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: CHIMEI INNOLUX
Model: M215HGE-P02
Type: a-Si TFT-LCD, CELL
Diagonal size: 21.5 inch
Resolution: 1920x1080, FHD
Display Mode: TN, Normally White, Transmissive
Active Area: 476.64x268.11 mm
Surface: Antiglare (Haze 25%), Hard coating (3H)
Transmissivity: 6.3% (with Polarizer)
Contrast Ratio: 1000: 1
Display Colors: 16.7M (8-bit)
Response Time: 1.5 / 3.5 (Tr / Td)
Frequency: 60Hz
Signal Interface: LVDS (2 ch, 8-bit), 30 pins
Voltage: 5.0V