Technical description and composition of the THOMSON 40FT4253 TV, panel type and modules used. The composition of the modules.THOMSON LED
Model: 40FT4253
Chassis / Version: MT10B
Panel: LTA400HM13
LED backlight: 2011SGS40 5630 60 H1 REV1.1
T-CON: 400HR42S4LV0A
LED driver (backlight): SSL400_0E2B
Power Supply (PSU): 40-E461C0-PWG1XG
PWM Power: FAN7930C, FSFR1700XS, VIPER17L
MOSFET Power: K12A50D
MainBoard: 40-MT10B2-MAC2XG
IC MainBoard: MT5310CHOU, MT5135AE, H5TQ1G630FR, TAS5707
Tuner: TDTK-G931D
Specifications 40FT4253
THOMSON 40FT4253
General recommendations for TV LCD LED repair
Possible malfunctions
- The THOMSON 40FT4253 TV does not turn on and does not show any signs of operability at all. No response to the remote control and front panel control buttons.
Often in such cases, the power module 40-E461C0-PWG1XG is faulty. It is necessary to measure the output voltages in its secondary circuits, and in the event of their complete absence, the serviceability of the power switches (K12A50D) and rectifier diodes should be checked for possible breakdown (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 usually breaks.
Breakdown of Mos-Fet switches used in switching power supplies is often caused by malfunctions of other elements, for example, in the power supply circuit of the PWM controller, in frequency setting or damper circuits, as well as in negative feedback stabilization. PWM microcircuits (PWM) FAN7930C, FSFR1700XS, VIPER17L are usually checked by replacing them with new ones, or knowingly working properly.
- There is no picture, but there is sound and reaction to commands from the remote control. Or the image appears immediately after switching on and disappears.
The malfunction in most of these cases is found in the nodes and elements of the LED panel backlight. The reason may 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.
To test the LED strips, in order to open all the transitions of the LEDs, several tens of volts or more are needed; 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 K / Z, then the LED is faulty and needs to be replaced.
- The TV does not go into operation, does not respond to the remote control. The indicator on the front panel is on or blinking.
Repair or diagnostics of the 40-MT10B2-MAC2XG motherboard should begin with checking the stabilizers and power converters required to power the microcircuits and 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 - MT5310CHOU, MT5135AE, H5TQ1G630FR, TAS5707. In cases where a BGA processor is used, its malfunction is usually detected by the local warm-up method.
If THOMSON 40FT4253 has no picture, but there is sound, often the LTA400HM13 display backlight 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 LTA400HM13 LCD panel, a process that requires experience and qualifications from the technician. We do not recommend doing such work on your own to the owners of TVs and craftsmen who do not have experience in repairing LCD panels
If there is no image, and the backlight is on, the screen becomes slightly lighter when turned on, and in an open TV, light can be seen through the holes in the panel case.
In this case, the panel may also be faulty - damage to the 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 40-MT10B2-MAC2XG also turns out to be faulty, a software failure is also possible.
Then, first of all, you need to check the panel supply voltage, the 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 the normal range, it is necessary to trace the passage of LVDS signals from the MainBoard 40-MT10B2-MAC2XG with an oscilloscope, as well as synchronizing signals to the loops with drivers.
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.
If there is no tuning for terrestrial or cable TV channels, you should make sure that the software is correct, as well as that the supply voltages on the TDTK-G931D tuner terminals are in accordance with the ratings. It is also necessary to check with an oscilloscope the presence of pulses of data exchange between the tuner and the processor via the I2C bus.
Owners and users of the THOMSON 40FT4253 TV should remember that self-repair without special knowledge, skills and qualifications can be fraught with negative consequences that can lead to complete non-repairability of the device!
DOWNLOAD SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> THOMSON Main 40-MT10B2-MAC2XG Chassis MT10B
The appearance of the MainBoard 40-MT10B2-MAC2XG is shown in the figure below:40-MT10B2-MAC2XG
External view of the power supply
The main features of the THOMSON 40FT4253 device:
Installed matrix (LED panel) LTA400HM13.
Matrix control uses Timing Controller (T-CON) 400HR42S4LV0A.
The LED driver SSL400_0E2B is used to power the backlight LEDs.
The formation of the necessary supply voltages for all nodes of the THOMSON 40FT4253 TV is carried out by the 40-E461C0-PWG1XG power module, or its analogs using FAN7930C, FSFR1700XS, VIPER17L microcircuits and K12A50D power switches.
MainBoard - the main board (motherboard) is a 40-MT10B2-MAC2XG module using MT5310CHOU, MT5135AE, H5TQ1G630FR, TAS5707 and others.
Tuner TDTK-G931D provides reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: SAMSUNG
Model: LTA400HM13
Type: a-Si TFT-LCD, Panel
Diagonal size: 40 inch
Resolution: 1920x1080, FHD
Display Mode: S-PVA, Normally Black, Transmissive
Active Area: 885.6x498.15 mm
Surface: Antiglare
Brightness: 400 cd / m²
Contrast Ratio: 4000: 1
Display Colors: 16.7M (8-bit), CIE1931 70%
Response Time: 8 (G to G)
Frequency: 60Hz
Lamp Type: WLED Embedded (LED Driver)
Signal Interface: LVDS (2 ch, 8-bit), 51 pins
Voltage: 12.0V
LED TV THOMSON 40FT4253 with LCD LTA400HM13, diagonal size 40 "(102 cm) 16: 9 format. The declared brightness of the screen of 380 cd / m2 is provided by modern LED backlight LED. The design of the LCD panel uses backlighting with end-position LEDs - Edge LED. The design and technical capabilities of the TV allow viewing in high quality HD at a resolution of 1920x1080 pixels in graphic resolution according to the standard 1080p (Full HD). Input high-frequency or video signal is decoded in analog systems PAL, SECAM, NTSC. Digital signal formation (graphic format ) is produced in the standards 480i, 480p, 576i, 576p, 720p, 1080i, 1080p Media formats are supported: MP3, MPEG4, JPEG.
Speaker power of 10 W (2x5 W) is provided by two speakers. The NICAM STEREO audio processing system is used.
External interface (communication with other devices) is supported by standard input and output connectors: antenna input (RF), audio x2, component, SCART, VGA, HDMI x3, USB. A headphone jack is provided. A standard VGA (D-Sub 15) connector is used to connect a laptop or computer. This interface supports resolutions: 640x480, 800x600, 1024x768, 1280x1024, 1360x768. The digital tuner has the ability to receive television channels in the DVB-T MPEG4, DVB-C standards.
The power consumed by the TV from the network in the operating mode is not more than 110 W.
Dimensions: with stand 987x692x267 mm, without stand 987x633x48 mm.
TV weight: with stand: 15.1 kg, without stand: 14 kg.
Attention! The LTA400HM13 panel of the THOMSON 40FT4253 LED TV 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 drips down the glass onto the cables to make the TV unrepairable.