Technical description and composition of the BBK LEM3283 TV, type of panel and applicable modules. The composition of the modules.BBK LED
Model: LEM3283 V1.0
Panel: LC320EXN SDA1
LED backlight: 3660L-0386A; 2 * 48 led
T-CON: LC320EXN 6870C-0370A LG, TL2345ML
LED driver (backlight): 6917L-0072A LG
PWM LED driver: BD9262EFV
Power Supply (PSU): AY068D-4SF04 Rev1.0 AY1219A
MainBoard: T.MS18VG.81B 11467
IC MainBoard: MST6M182VG-LF-Z1, SPI Flash: 25Q32BSIG, TPA3110D2, IT6633E-P, AIC2857F
Tuner: CDT-3SP5I2-36
Technical Specifications LEM3283
BBK LEM3283
General repair guidelines for TV LCD LED
Possible manifestations of defects
- The BBK LEM3283 TV does not turn on, and generally does not show any signs of turning on. There are no reactions to the control buttons and the remote control.
In most of these cases, the AY068D-4SF04 main switching power supply is faulty. It is necessary to measure the 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 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 be PWM (PWM). It is checked only by replacement with a known good one.
- There is no image, there is sound, it is responding to the remote control. Or immediately after turning on for a second, the image may appear and immediately disappear.
Usually in such cases, a malfunction is detected in the backlight nodes of the LED panel. The reason for this may be a break in the LED circuit, or a problem in stabilizing their power supply.
It is impossible to check the line of series-connected LEDs without a special current source, and for this purpose it is not safe to use any voltage sources above 12V. Then it remains only to open the panel and check each LED separately. Usually, Chinese 9V-powered multimeters light up a single 3-volt LED, if you connect the probes in the forward direction, the red probe to the anode, and the 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 TV does not turn on, does not respond to the remote control. The indicator blinks or signals standby mode.
Repair or diagnostics of the T.MS18VG.81B 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 the TV works normally from external devices, but does not tune into television channels, the tuner CDT-3SP5I2-36 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.
It should be remembered! Attempts to independently repair the BBK LEM3283 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!
SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> BBK LEM3283FD (MST182VG+2IN1 POWER SUPPLY)
Service Manual with Schematic Diagram 44 pages on the model LEM3283FD, LEM3283FDT
To reduce the backlight current in LED drivers with the BD9262EFV controller, the total resistance of the resistors from terminal 23 (ISET) to the housing should be proportionally increased.Repair MainBoard
The appearance of MainBoard T.MS18VG.81B is shown in the figure below:
T.MS18VG.81B
T.MS18VG.81B can be used in TVs:
AKAI LEA-32V07P (Panel T315XW06 V.0), BBK LEM3283 V1.0 (Panel LC320EXN SDA1), BBK LEM3283F (Panel V315H3-LE4 Rev.C1), ERISSON 42LEN60 (Panel LC420EUN), ERISSON 32LEN60 (Panel LTA320AN01 D02 ), FUSION FLTV-32H20B (Panel LM315TA-T01), SUPRA STV-LC3217W (Panel LC320WXE-SBV1), SUPRA STV-LC3217AWL STV-LC3217W (Panel HV320WX2-201), SUPRA STV-LC3277W (Panel HV320WX2-201), SUPRA STV-LC32170F (Panel HK315TVM-HHC9H).
Main features of the BBK LEM3283 device:
Installed matrix (LED-panel) LC320EXN SDA1.
The matrix control uses the Timing Controller (T-CON) LC320EXN.
The LED driver 6917L-0072A is used to power the backlight LEDs, it is controlled by the BD9262EFV PWM controller.
The formation of the necessary supply voltages for all nodes of the BBK LEM3283 TV is carried out by the power module AY068D-4SF04, or its analogues.
MainBoard - the main board (motherboard) is a module T.MS18VG.81B, using microcircuits MST6M182VG-LF-Z1, SPI Flash: 25Q32BSIG, TPA3110D2, IT6633E-P, AIC2857F and others.
The tuner CDT-3SP5I2-36 provides the reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: LG Display
Model: LC320EXN-SDA1
Type: a-Si TFT-LCD, Panel
Diagonal size: 31.5 inch
Resolution: 1366x768, WXGA
Display Mode: S-IPS, Normally Black, Transmissive
Active Area: 697.685x392.256 mm
Surface: Antiglare (Haze 10%), Hard coating (3H)
Brightness: 380 cd / m²
Contrast Ratio: 1200: 1
Display Colors: 16.7M (6-bit + Hi-FRC), CIE1931 68%
Response Time: 6 (G to G)
Frequency: 60Hz
Lamp Type: WLED Embedded (LED Driver)
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 12.0V
LED TV BBK LEM3283 with LCD V315H3-LE4, diagonal size 32 "(81 cm) 16: 9 format. The required brightness of the screen is 450 cd / m² LED backlight LED. The ratio of maximum brightness to minimum (contrast) is 6000 : 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 for graphic decomposition 720p (HD Ready). The input high-frequency or video signal can be processed in analog systems PAL, SECAM, NTSC Graphic Digital signal processing and generation takes place in the standards 480i, 480p, 576i, 576p, 720p, 1080i, 1080p. Supported media file formats: MP3, WMA, MPEG4, DivX, MKV, JPEG.
The power of the sound system 12 W (2x6 W) provides 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, SCART, RGB, 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.
The power consumed by the TV in the operating mode from the network is 80 watts.
Overall dimensions: With stand 780x546x205 mm, Without stand 780x491x46 mm.
Mass of the TV: 8.15 kg.
Attention! The V315H3-LE4 Rev.C1 panel of the BBK LEM3283 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.