Technical description and composition of the THOMSON 42FS4246C TV, panel type and modules used. The composition of the modules.THOMSON LED
Model: 42FS4246C
Chassis / Version: MT10L-EU
Panel: T420HW07 V.7
T-CON: T420HW06; AUO-12401, TPS65161, RM5101
LED driver (backlight): T370HW04
PWM LED driver: HV9982, G1564
Power Supply (PSU): 40-PE4212-PWC1XG
PWM Power: VIPER17L, L6599AD
MainBoard: 40-MT10B2-MAA2XG
IC MainBoard: MT5310CHOU, H5TQ1G630FR, MT5135AE, TAS5707
Tuner: TDTK-G931D
Control: 42FS4246
Specifications 42FS4246C
THOMSON 42FS4246C
General recommendations for TV LCD LED repair
Possible manifestations of defects
- The THOMSON 42FS4246C 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.
In some of these cases, the main switching power supply, the 40-PE4212-PWC1XG module, 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 and rectifier diodes should be checked for a possible breakdown (short circuit).
In case of breakdowns in the secondary circuits of the converter, it can usually work in an emergency mode in a short-circuit mode, and with a short circuit in the power elements of the primary circuit, the mains fuse or current sensor in the source of the key most often breaks off.
Mos-Fet power switches used in switching power supplies sometimes fail due to a malfunction of any other elements that can disable it in the key mode, or create an excess of the maximum permissible key parameters. These can be elements supplying a PWM regulator, frequency setting or damper circuits, or elements of negative feedback in the stabilization circuit. PWM controllers VIPER17L, L6599AD, in the absence of visible damage or outright short circuits between the terminals, are checked by replacing them with new ones, or known to be working properly.
- There is no image, there is sound, it reacts to the remote control. Or the image may appear for a second when turned on and disappear immediately.
In such cases, the most likely malfunction of the LED panel backlighting elements. 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.
When trying to detect a break in the LED lines, it should be borne in mind that it is difficult to do this without disassembling the panel. For example, a current source is needed to open PN junctions connected in series.
- The indicator on the front panel blinks, the TV does not turn on in operating mode, does not respond to the remote control.
Repair or diagnostics of the 40-MT10B2-MAA2XG 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). Repair of the board and replacement of microcircuits MT5310CHOU, H5TQ1G630FR, MT5135AE, TAS5707 are made if the necessary equipment and the corresponding element base are available. Failures associated with the use of BGA soldering technologies can be localized by warming up.
If there is no reception of TV channels, but the TV is working properly from external devices, first of all, you need to check the supply voltage of the TDTK-G931D tuner and update the software. I2C communication pulses must be monitored with an oscilloscope.
If the THOMSON 42FS4246C has no picture, but there is sound, often the backlight of the T420HW07 V.7 display 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 T420HW07 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 the main board MainBoard 40-MT10B2-MAA2XG often 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 use an oscilloscope to trace the passage of LVDS signals from MainBoard 40-MT10B2-MAA2XG, as well as synchronization signals to 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.
Attention to users! Self-repair of the THOMSON 42FS4246C TV without the appropriate qualifications and the necessary experience can lead to its complete non-repairability!
DOWNLOAD SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> THOMSON 42FS4246C Chassis MT10L-EU
The appearance of the MainBoard 40-MT10B2-MAA2XG is shown in the figure below:40-MT10B2-MAA2XG
External view of the power supply
The main features of the THOMSON 42FS4246C device:
Installed matrix (LED panel) T420HW07 V.7.
Matrix control uses Timing Controller (T-CON) T420HW06 ;.
The LED driver T370HW04 is used to power the backlight LEDs, it is controlled by the PWM controller HV9982, G1564.
The formation of the necessary supply voltages for all nodes of the THOMSON 42FS4246C TV is carried out by the 40-PE4212-PWC1XG power module, or its analogs using VIPER17L, L6599AD microcircuits.
MainBoard - the main board (motherboard) is a 40-MT10B2-MAA2XG module, using the MT5310CHOU, H5TQ1G630FR, MT5135AE, TAS5707 and others.
Tuner TDTK-G931D provides reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: AUO
Model: T420HW07 V7
Type: a-Si TFT-LCD, Panel
Diagonal size: 42 inch
Resolution: 1920x1080, FHD
Display Mode: AMVA3, Normally Black, Transmissive
Active Area: 930.24x523.26 mm
Surface: Hard coating (3H)
Brightness: 400 cd / m²
Contrast Ratio: 4000: 1
Display Colors: 16.7M (8-bit), CIE1931 72%
Response Time: 6.5 (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 42FS4246C with LCD T420HW07, diagonal size 42 "(107 cm) 16: 9 format. The declared brightness of the screen of 350 cd / m2 is provided by modern LED backlight LED. The design of the LCD panel uses backlighting with edge-mounted 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. Supported multimedia formats: MP3, DivX, JPEG.
Speaker power 16 W (2x8 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), component, SCART, RGB, 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, 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 140 W.
Dimensions: with stand 1016x685x226 mm, without stand 1016x637x50 mm.
TV weight: with stand: 17.4 kg, without stand: 14.7 kg.
Attention! The panel T420HW07 V.7 of the THOMSON 42FS4246C 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.