Technical description and composition of the TCL 29B340 TV, panel type and applicable modules. The composition of the modules.TCL
Model: 29B340
Chassis / Version: 40-0MS82D-MAD2LG
Panel: V290BJ1-L01
Lamp backlight: 3 LAMP CCFL
T-CON: V290BJ1-XC01
Inverter (backlight): integrated into PSU
PWM Inverter: OZ9976
Power Supply (PSU): PLC80P 81-PWL029-PW1
PWM Power: FAN7930C, OB2283B
MOSFET Power: TK12A50D
MainBoard: 40-0MS82D-MAD2LG
IC MainBoard: CPU: MST6M182VG-LF-Z1, SPI Flash: 25Q32, Audio: STA380BW
Tuner: XF-3SA 07-389SI3-NF1G
Technical Specifications L29B340
TCL 29B340
General recommendations for repairing TV LCD
Possible manifestations of defects
- The TCL 29B340 TV does not turn on at all. There is no reaction to the remote control and control buttons from the front panel. Indicator lights do not light or flash.
Most often, with such manifestations, the PLC80P main power module turns out to be faulty. It is necessary to measure its output voltages and, if they are absent, check the operability of power switches (TK12A50D) and rectifier diodes in the converters for possible breakdown.
In case of breakdowns of semiconductors in the secondary circuits, the converter can usually work abnormally in the short circuit mode, and during short circuit in the power elements of the primary circuit, the mains fuse often 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. These can be circuits supplying the PWM controller, damping or frequency-setting circuits, or elements of OOS (negative feedback) in the stabilization circuit. PWM controllers (PWM) FAN7930C, OB2283B, in the absence of external damage and short circuit between the terminals, are checked by replacing with obviously good ones.
- 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.
These manifestations can be triggered by the power module, or by inverter defects, as well as by the distortion of the currents in the lamps due to their uneven wear. If all the electrolytic capacitors of the filter according to the inverter power supply are serviceable, you should make sure that the lamps are working, then you need to check the converter keys and the secondary windings of the transformers.
If in diagnosing a malfunction, it is necessary to disable the inverter protection, there is a risk of failure of the power elements of the inverter, and special care is required during work, and after they are finished, it is necessary to restore the protection circuits for further safe operation of the TV by the owner in normal mode.
- The TV does not turn on, the indicator indicates standby or operating mode, or blinks.
Repair or diagnostics of the 40-0MS82D-MAD2LG motherboard should begin by checking the stabilizers and power converters needed to power the microcircuit and matrix. If necessary, update or replace the software (software). Often, the MB (SSB) card needs to be replaced in case of complex faults that are difficult to detect. When trying to repair it, you should check its elements - CPU: MST6M182VG-LF-Z1, SPI Flash: 25Q32, Audio: STA380BW 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 voltage at the terminals of the tuner XF-3SA 07-389SI3-NF1G. 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.
Attention to users! Self-repair of the TCL 29B340 TV without the appropriate qualifications and the necessary experience can lead to its complete non-repairability!
FIRMWARE FOR SPI FLASH -----------> TCL 29B340, Main: 40-0MS82D-MAD2LG, Panel: V290BJ1-L01
The appearance of the MainBoard 40-0MS82D-MAD2LG is shown in the figure below:40-0MS82D-MAD2LG
40-0MS82D-MAD2LG can be used in TVs:
MYSTERY MTV-3012W (Panel V290BJ1-L01 Rev.C1 ), TCL 29T2100 (Panel V290BJ1-LE1 Rev.C1), TCL 29B340 (Panel V290BJ1-L01).
The appearance of the power supply
Main features of the TCL 29B340 device:
Installed matrix (LCD panel) V290BJ1-L01.
The matrix control uses the Timing Controller (T-CON) V290BJ1-XC01.
To power the backlight, a converter is used, combined with a power supply, controlled by the OZ9976 PWM controller.
The necessary supply voltages for all nodes of the TCL 29B340 TV are generated by the PLC80P power module or its analogs using FAN7930C, OB2283B microcircuits and TK12A50D type power switches.
MainBoard - the main board (motherboard) is a 40-0MS82D-MAD2LG module using CPU chips: MST6M182VG-LF-Z1, SPI Flash: 25Q32, Audio: STA380BW and others.
The XF-3SA 07-389SI3-NF1G tuner provides TV reception and channel tuning.
Additional technical information about the panel:
Brand: CMO
Model: V290BJ1-L01
Type: a-Si TFT-LCD, Panel
Diagonal size: 29.0 inch
Resolution: 1366x768, WXGA
Display Mode: Super MVA, Normally Black, Transmissive
Active Area: 631.092x354.816 mm
Surface: Antiglare (Haze 3.5%)
Brightness: 300 cd / m²
Contrast Ratio: 2500: 1
Display Colors: 16.7M (8-bit), CIE1931 72%
Response Time: 8.5 (G to G)
Frequency: 60Hz
Lamp Type: 3 pcs CCFL Without Driver
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 12.0V
TCL L29B340 TV with a 29 "(74 cm) diagonal LCD display in 16: 9 format. HD images can be viewed at 1366x768 pixels in the 720p (HD Ready) graphic decomposition standard. The input high-frequency or video signal can be processed in analog systems PAL, SECAM, NTSC. Graphic processing and digital signal generation occurs in the standards 480i, 480p, 576i, 576p, 720p, 1080i. Supported media file formats: MP3, MPEG4, MKV, JPEG.
The power of the sound system 10 W (2x10 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, component, VGA, HDMI, USB. 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 operating mode from the network is 75 watts.
Attention! The LCD TV panel of TCL L29B340 is its most expensive component.
Avoid hitting the glass and exerting pressure on the screen to avoid permanent damage to the LCD panel!