Technical description and composition of the THOMSON T55E11DHU-01B TV, panel type and modules used. The composition of the modules.THOMSON LED
Model: T55E11DHU-01B
Chassis / Version: MT31LB
Panel: LVF550CSDX E2 V2
T-CON: TT5461B03-2-C-1
LED driver (backlight): integrated into PSU
Power Supply (PSU): PE461C4 40-E461C4-PWH1XG / PWJ1XG
PWM Power: FAN7930C, FSFR1700XS, VIPER17L
MOSFET Power: K12A50D
MainBoard: 40-T31T0T-MAD2HG
IC MainBoard: SPI FLASH: W25Q64, AUDIO: TPA3110D2
Tuner: ST34WN-2T-B
Specifications T55E11DHU-01B
THOMSON T55E11DHU-01B
General recommendations for TV LCD LED repair
Possible manifestations of malfunctions
- THOMSON T55E11DHU-01B TV does not turn on at all. Control lamps do not light up or blink. The TV on the remote control and control panel buttons does not respond.
Often in such cases, the PE461C4 power module is defective. Its output voltages should be measured and, in their absence, the serviceability of the power switches (K12A50D) and rectifier diodes in the converters should be checked for possible breakdown.
In case of breakdowns of semiconductors in the secondary circuits, the converter can usually work in an emergency in the short-circuit mode, and in the event of a short circuit in the power elements of the primary circuit, the mains fuse often 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 regulator, 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 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.
As a rule, in such cases there is no display 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 pierced in the K / Z.
- The indicator on the front panel blinks, the TV does not turn on in operating mode, does not respond to the remote control.
If THOMSON T55E11DHU-01B has no picture, but there is sound, often the LVF550CSDX E2 V2 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 LVF550CSDX LCD panel - 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-T31T0T-MAD2HG 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 use an oscilloscope to trace the passage of LVDS signals from the MainBoard 40-T31T0T-MAD2HG, 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.
Repair or diagnostics of the 40-T31T0T-MAD2HG 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 - SPI FLASH: W25Q64, AUDIO: TPA3110D2 and replace the failed chips with new ones. Some malfunctions may be associated with the use of BGA soldering technologies in modern Main Board. Usually such defects are detected by local heating of the chip.
Before replacing the ST34WN-2T-B tuner, if there is no tuning to the channels, you must first check the software and the supply voltage at its outputs. You also need to make sure that the tuner and processor can exchange data via the I2C bus
We remind users again! Attempts to self-repair the THOMSON T55E11DHU-01B TV without the appropriate qualifications and the necessary experience can lead to its complete non-repairability!
DOWNLOAD SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> PE461C4 Power supply
The appearance of the MainBoard 40-T31T0T-MAD2HG is shown in the figure below:40-T31T0T-MAD2HG
The main features of the THOMSON T55E11DHU-01B device:
Installed matrix (LED panel) LVF550CSDX E2 V2.
Matrix control uses the Timing Controller (T-CON) TT5461B03-2-C-1.
A converter combined with a power supply is used to power the backlight LEDs.
The formation of the necessary supply voltages for all nodes of the THOMSON T55E11DHU-01B TV is carried out by the PE461C4 power module, or its analogs using FAN7930C, FSFR1700XS, VIPER17L microcircuits and power switches of the K12A50D type.
MainBoard - the main board (motherboard) is a 40-T31T0T-MAD2HG module, using SPI FLASH chips: W25Q64, AUDIO: TPA3110D2 and others.
The ST34WN-2T-B tuner provides reception of television programs and tuning to channels.
LED TV THOMSON T55E11DHU-01B with LCD LVF550CSDX, diagonal size 55 "(140 cm) 16: 9 format. The declared brightness of the screen of 300 cd / m2 is provided by modern LED backlighting. The ratio of maximum brightness to minimum (contrast) is not less than 4000: 1. The LCD panel uses edge LED backlighting. The design and technical capabilities of the TV allow viewing in high quality HD at a resolution of 1920 × 1080 pixels in graphic resolution at the standard 1080p (Full HD). Input high-frequency or video signal. decoded in analog systems PAL, SECAM, NTSC Digital signal formation (graphic format) is performed in 480i, 480p, 576i, 576p, 720p, 1080i, 1080p standards Supported multimedia formats: MP3, JPEG.
Speaker power 16 W (2x8 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, component, SCART, VGA, HDMI x2, MHL, USB. A standard VGA (D-Sub 15) connector is used to connect a laptop or computer. This interface supports resolutions: 640x480, 800x600, 1024x768, 1280x1024, 1360x768, 1920x1080. The digital tuner has the ability to receive television channels in the DVB-T MPEG4, DVB-C, DVB-T2 standards.
The power consumed by the TV from the network in the operating mode is not more than 140 W.
Dimensions: with stand 1248x767x276 mm, without stand 1248x733x71 mm.
TV weight: 23.8 kg.
Attention! The LVF550CSDX E2 V2 panel of the THOMSON T55E11DHU-01B 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.