Technical description and composition of the THOMSON T24E29U TV, panel type and modules used. The composition of the modules.THOMSON LED
Model: T24E29U
Chassis / Version: 40-MT2700-MAB2LG
Panel: T240XVN01.0
LED backlight: 240TA0A V0 - 40 LED
T-CON: T240XVN01.0 CTRL BD (T240XVN01.V0)
LED driver (backlight): integrated into PSU
PWM LED driver: MAP3204
MOSFET LED driver: MDS1903
Power Supply (PSU): 40-ES2410-PWC1XG
PWM Power: FAN6754
MainBoard: 40-MT2700-MAB2LG
IC MainBoard: MT8227AAKU,
Tuner: 18273 TCL
Control: IR: 40-19PKVA-IRA2LG
Specifications T24E29U
THOMSON T24E29U
General recommendations for TV LCD LED repair
Possible manifestations of defects
- The THOMSON T24E29U TV does not turn on, does not respond to the remote control and control panel buttons, does not light or blink indicators.
In such cases, you should start looking for a fault in the 40-ES2410-PWC1XG power supply circuits. It is necessary to measure its secondary output voltages, and if they are absent, check the power switches and rectifier diodes in the converters for a short circuit.
In case of breakdowns of semiconductors in the secondary circuits of any converter, as a rule, it can operate in an emergency mode of short circuit without output voltages, and with a short circuit in the elements of the primary circuit, the mains fuse most often breaks off immediately and less often the current sensor in the source of the key.
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. FAN6754 PWM microcircuits are usually checked by replacing them with new ones, or knowingly working.
- There is no image, there is sound, it reacts to the remote control. Or, immediately after switching on for a second, the image may appear and immediately disappear.
The malfunction in most of these cases is found in the nodes and elements of the LED panel backlight. The reason for this may be an open circuit in the LED circuit, or a problem in stabilizing their power supply.
It is impossible to detect an open circuit in the LED line without disassembling the panel with a simple multimeter. The LEDs are connected in series and a voltage of several tens of volts is required to open their junctions. Ideally, a current source is suitable for such purposes. You can open the panel and check each LED separately. Usually, Chinese multimeters lightly light one 3-volt LED if you connect the probes to it in the forward direction (red probe to the anode, black to the cathode). For dual 6-volt LEDs, the PN junction of its emergency zener diode can serve as an indicator of LED health. In the event of a malfunction of the LED, its zener diode will either be cut off, or broken through in the K / Z.
- The indicator blinks or is on constantly, the TV does not turn on, does not respond to the remote control.
Repair or diagnostics of the 40-MT2700-MAB2LG 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). Often the MB (SSB) board must be replaced in case of complex malfunctions that are difficult to detect. When trying to repair, you should check its elements - MT8227AAKU, and replace the failed chips with new ones. Some malfunctions may be associated with the use of BGA soldering technologies in modern Main Board. Typically, such defects are detected by local heating of the chip.
The malfunction of the 18273 TCL tuner is established after checking the software and all supply voltages at its outputs. The data exchange of the tuner with the processor via the I2C bus can be monitored with an oscilloscope.
If the THOMSON T24E29U has no picture, but there is sound, often the backlight of the T240XVN01.0 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 LCD panel T240XVN01.0 - a process that requires experience and qualifications from the master. 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 you can see light 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-MT2700-MAB2LG often turns out to be faulty; a software failure is also possible.
Then, first of all, it is necessary 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 the normal range, it is necessary to trace the passage of LVDS signals from MainBoard 40-MT2700-MAB2LG with an oscilloscope, 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.
Remember! Attempts to self-repair the THOMSON T24E29U 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!
Additional MainBoard RepairThe appearance of the MainBoard 40-MT2700-MAB2LG is shown in the figure below:
40-MT2700-MAB2LG
External view of the power supply
The main features of the THOMSON T24E29U device:
Installed matrix (LED-panel) T240XVN01.0.
Matrix control uses Timing Controller (T-CON) T240XVN01.0.
A converter combined with a power supply is used to power the backlight LEDs, and is controlled by the MAP3204 PWM controller. The keys of the MDS1903 type are used as power elements of the LED driver.
The formation of the necessary supply voltages for all nodes of the THOMSON T24E29U TV is carried out by the 40-ES2410-PWC1XG power module, or its analogs using FAN6754 microcircuits.
MainBoard - the main board (motherboard) is a 40-MT2700-MAB2LG module, using MT8227AAKU microcircuits, and others.
Tuner 18273 TCL provides reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: AUO
Model: T240XVN01.0
Type: a-Si TFT-LCD, Panel
Diagonal size: 24.0 inch
Resolution: 1366x768, WXGA
Display Mode: VA, Normally Black, Transmissive
Active Area: 531.72x298.94 mm
Surface: Antiglare (Haze 2%), Hard coating (3H)
Brightness: 250 cd / m²
Contrast Ratio: 2000: 1
Display Colors: 16.7M (8-bit)
Response Time: 6.5 (G to G)
Frequency: 60Hz
Lamp Type: 10S4P WLED Without Driver
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 12.0V
LED TV THOMSON T24E29U with LCD T240XVN01.0, diagonal size 24 "(61 cm) 16: 9. The declared brightness of the screen of 250 cd / m² is provided by modern LED backlight LED. The ratio of maximum brightness to minimum (contrast) is not less than 1000: 1. The LCD panel uses an edge LED backlighting. You can view in high quality HD at a resolution of 1366x768 pixels in 720p standard (HD Ready). Input high-frequency or video signal is decoded in analog systems PAL, SECAM, NTSC Digital signal formation (graphic format) is performed in 480i, 480p, 576i, 576p, 720p, 1080i standards, multimedia formats are supported: MP3, JPEG.
Speaker power 6 W (2x3 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), AV x2, component, VGA, HDMI, USB. A standard VGA (D-Sub 15) connector is used to connect a laptop or computer. This interface supports resolutions: 640x480, 800x600, 1024x768, 1360x768.
The power consumed by the TV from the network in the operating mode is not more than 35 W.
Dimensions: with stand 582x397x187 mm, without stand 582x367x48 mm.
TV weight: 4.2 kg.
Attention! The panel T240XVN01.0 of the THOMSON T24E29U 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.
