Technical description and composition of the BBK 43LEM-1018 TV, panel type and modules used. The composition of the modules.
BBK LED
Model: 43LEM-1018 / FT2C
Chassis / Version: JUC7.820.00125910
Panel: C430F15-E1-A
LED driver (backlight): integrated into MainBoard
PWM LED driver: MP4012
MOSFET LED driver: AOD458 TO-252
Power Supply (PSU): R-HS105D-1MF11 XR7.820.497V1.5
PWM Power: NCP1271A, PFC: FA5591N
MainBoard: JUC7.820.00125910
IC MainBoard: 25Q64, TPS54428 IAGMF, RT9108NB
Tuner: CH DM121 C816RH
Specifications 43LEM-1018 / FT2C
BBK 43LEM-1018
General recommendations for TV LCD LED repair
Possible manifestations of malfunctions
- TV BBK 43LEM-1018 does not turn on. There are no signs of operability. The indicators on the front panel do not light up or blink, the TV does not respond to the control buttons.
In such cases, the fault should be looked for first of all in the R-HS105D-1MF11 power module. Then you should measure its output voltages and, in case of their complete or partial absence, it is necessary to check the serviceability of the power switches and rectifier diodes of the converters for the presence of a possible short circuit.
In case of breakdowns in the secondary circuits, the converter, as a rule, can operate in an emergency mode in a short circuit mode, and in case of a short circuit in the power elements of the primary circuit, the mains fuse is usually cut off.
The breakdown of power switches (MosFet) in switching sources is sometimes caused by malfunctions of other circuit elements, for example, in the circuits supplying the PWM controller, frequency setting or damper, as well as in the circuits of Negative Feedback (OOS) stabilization. PWM controllers (PWM) NCP1271A, PFC: FA5591N, if they do not have visible damage to the case and an outright short circuit between the pins, are usually checked by replacement.
- There is no picture, but there is sound, it reacts to the remote control. Or the image appears when turned on and immediately disappears
In such cases, the most likely malfunction of the LED panel backlighting elements. Most often, the reason for this is a break in the LEDs, or poor contact in the connectors of the brackets, less often the LED driver may be faulty.
To test the LED strips, to open all the transitions of the LEDs, you need several tens of volts or more, it is best to use a current source for such purposes. The breakage of several PN junctions connected in series cannot be detected with a multimeter or tester. In such cases, it is necessary to open the panel and check each LED. If your multimeter cannot open the LED junctions in forward bias, you can sometimes detect the presence of a protective zener diode PN junction by connecting the probes in the opposite direction. If the zener diode is cut off or broken in the K / Z, then the LED is faulty and needs to be replaced.
If the BBK 43LEM-1018 / FT2C has no picture, but there is sound, the backlight of the C430F15-E1-A display often simply does not work. Moreover, in LED TVs, the LEDs inside the panel usually fail, less often the LED driver.
In such cases, you can see a barely noticeable image with a successful hit of external light on the screen.
Replacing the LEDs requires disassembling the LCD panel C430F15-E1-A - a process that requires experience and qualifications from the technician. We do not recommend doing such work on your own to owners of TVs and craftsmen who do not have experience in repairing LCD panels.
READ HOW TO REPAIR THE TV LED BACKLIGHT --------------> HERE.
If there is no image, and the backlight is on, the screen becomes slightly lighter when turned on, and in an open TV, light is visible through the holes in the panel case.
In this case, the panel may also be faulty - damage to strips, loops, for example, as a result of moisture ingress after unsuccessful washing of the screen, the T-CON (Timing Controller) board may be faulty. But often the main board MainBoard JUC7.820.00125910 also turns out to be faulty, a software failure is also possible.
Then, first of all, you need to check the panel supply voltage, fuses on the T-CON board, as well as the supply and reference voltages of the column and line drivers - VGH, VGL, Vcom.
If these measurements are within normal limits, it is necessary to trace the passage of LVDS signals from MainBoard JUC7.820.00125910, as well as synchronizing signals to loops with drivers, with an oscilloscope.
Flooded or unsuccessfully washed screens of LED TVs can be restored, in about half of the cases, usually if significant damage has not formed in the loops and panel strips.
- The TV does not go into operation, does not respond to the remote control. The indicator on the front panel is constantly on or blinking.
Repair or diagnostics of the JUC7.820.00125910 motherboard should begin with checking the stabilizers and power converters necessary to power the microcircuits and the matrix. If necessary, you should update or replace the software (software). Sometimes it is necessary to check or replace (if necessary) elements of the MainBoard - 25Q64, TPS54428 IAGMF, RT9108NB. In cases where a BGA processor is used, its malfunction is usually detected by local warming up.
If there is no reception of television channels, but the TV is working properly from external devices, first of all, you need to check the supply voltage of the CH DM121 C816RH tuner and update the software. I2C communication pulses must be monitored with an oscilloscope.
I remind users again! Attempts to self-repair the BBK 43LEM-1018 TV without the appropriate qualifications and the necessary experience can lead to its complete non-repairability!
Revision after repair of the backlight. Information from the master.
Decrease the backlight current from 400 mA to 300 mA - removed one of the 3.9 Ohm resistors (R421-R424) in the current sensor of the MP4012 driver on the XR7.820.497V1.5 board.
Additional MainBoard Repair
The appearance of the MainBoard JUC7.820.00125910 is shown in the figure below:
JUC7.820.00125910
JUC7.820.00125910 can be used in TVs:
DEXP F55B7200C (Panel C550F14-E6-L), DEXP F43B7200C (Panel C430F14-E1-L).
External view of the power supply
R-HS105D-1MF11:
Main features of the BBK 43LEM-1018 device:
Installed matrix (LED panel) C430F15-E1-A.
To power the backlight LEDs, a converter combined with the JUC7.820.00125910 main board is used, controlled by the MP4012 PWM controller. The keys of the AOD458 TO-252 type are used as power elements of the LED driver.
Technical description
LED TV BBK 43LEM-1018 / FT2C with LCD C430F15-E1-A, 43 "(109 cm) diagonal in 16: 9 format. The required screen brightness of 250 cd / m2 is provided by LED backlighting. The ratio of maximum brightness to minimum (contrast) is 3000: 1. This model uses edge LED side illumination.
The C430F15-E1-A sensor and the MainBoard JUC7.820.00125910 software realize high quality HD images at a resolution of 1920x1080 pixels in 1080p (Full HD) graphics. The input high-frequency or video signal can be processed in analog systems PAL, SECAM, NTSC. Graphic processing and formation of a digital signal occurs in the 480i, 480p, 576i, 576p, 720p, 1080i, 1080p standards. Supported media file formats: MP3, WMA, MPEG4, MKV, JPEG.
Speaker power of 6 W (2x3 W) is provided by two speakers. Uses the NICAM stereo signal processing system and the Sound Surround function.
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. A headphone output is provided. To connect a computer or laptop to this TV model, a VGA (D-Sub 15) connector on the TV case is used; this interface supports resolutions: 640x480, 800x600, 1024x768, 1280x1024, 1360x768, 1920x1080. The digital tuner is capable of receiving television channels in the DVB-T, DVB-T2, DVB-C standards.
In'Ergo menu. Screen resolution: 1920x1080 Pix (Full HD). Diagonal (cm): 109. Diagonal (inch): 43.
Display:
Matrix
backlight type: LED. Aspect ratio: 16: 9. Horizontal resolution (pix):
1920. Vertical resolution (pix): 1080. Horizontal viewing angle: 176.
Vertical viewing angle: 176. Response time (ms): 6.5. Brightness (cd /
m2): 250. Contrast: 3000: 1. Number of colors: 16,700,000.
Tuner:
DVB-T2. Ci + slot: 1. Analog TV tuner. DVB-T. DVB-C. Ci slot.
Analog tuner:
SECAM DK. Number of memorized channels: 100. Decoder NICAM stereo. Teletext.
Digital tuner:
Number of memorized channels: 1000. DVB-T MPEG4. Electronic program guide.
Sound parameters:
Number of built-in speakers (pcs): 2. Output power per channel (W): 8.
Inputs:
Composite
(AV) (pcs): 1. Component Y Pb Pr video input (pcs): 1. SCART (pcs): 1.
Antenna input RF In (pcs): 1. PC input VGA (D-SUB + PC Audio) ( pcs): 1.
USB port (pcs): 1. HDMI (pcs): 3. HDMI version: 1.3.
Outputs:
Headphone output O 3.5 (pcs): 1. Coaxial digital audio output (pcs): 1.
USB
version: 2.0. Noise suppression. Sleep timer. Menu languages: Russian,
Ukrainian, English. VESA mount. VESA mount type: 200x200.
Remote control:
The presence of a remote control. Remote control battery: AAA. Number of batteries for the remote control (pcs): 2.
Power supply:
Power supply type: Built-in. On Mode Power Consumption (W): 85
Built-in PSU:
Input supply voltage (V (Hz)): 100-240 ~ 50/60.
Dimensions:
Width
(mm): 965. Height (mm): 655. Depth (mm): 160. With stand: Width (mm):
965. Weight (kg): 8.6. Packing: Width (mm): 1065. Weight (gross) (kg):
11.05.
Appearance:
Body color: Black (B). Front panel trim: Plastic.
Completeness:
Additional remote control (mini). Remote control. Battery (pcs): 4. Mount for the stand. Manual. Warranty card.
The power supply unit XR7.820.497V1.5 is used.
Dimensions: With stand 965x619x209 mm, Without stand 965x562x77 mm.
TV weight: 8.5 kg.
Attention! Panel C430F15-E1-A LED TV BBK 43LEM-1018 / FT2C is an expensive and unreliable element.
Do not allow any impact on the glass and pressure on the screen surface to avoid damage to the LED panel!
It is also unsafe for liquid to spill onto the screen. Sometimes one drop is enough if it flows down the glass onto the cables to make the TV unrepairable.