Technical description and composition of the THOMSON T50E10DHU-01B TV, panel type and modules used. The composition of the modules.THOMSON LED
Model: T50E10DHU-01B
Chassis / Version: MT31LB
Panel: V500HJ1-LE8 REV.C1
LED backlight: V500H1-LE6-TREM7
T-CON: V500HJ1-XCME1, V500HJ1-XRME
LED driver (backlight): 40-50E411-DRC2LG
Power Supply (PSU): PE421C5 40-E421C6-PWC1XG
PWM Power: FAN7930C (PFC), FSL206MR (stb), FSFR1700XS
MOSFET Power: K12A50D
MainBoard: MT31LB 40-T31TOT-MAD2HG
IC MainBoard: TPA3110D2, W25Q64FVSIG, ATBM7811B
Tuner: RF221ZN V4D17AA
Control: IR: 40-50AS65-IRB2LG
Specifications T49D21SF-01B
THOMSON T50E10DHU-01B
General recommendations for TV LCD LED repair
Possible manifestations of malfunctions
- TV THOMSON T50E10DHU-01B does not turn on, does not respond to the remote control and control panel buttons, does not light or blink indicators.
In some of these cases, the main switching power supply, the PE421C5 module, is faulty. It is necessary to measure its output voltages, and in case of their absence (full or partial), the serviceability of the power switches (K12A50D) of the converters and rectifier diodes should be checked for a possible short circuit.
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.
The breakdown of power switches (MosFet) in switching sources is sometimes caused by malfunctions of other circuit elements, for example, in the circuits supplying the PWM controller, frequency setting or damper, as well as in the circuits of Negative Feedback (OOS) stabilization. PWM controllers (PWM) FAN7930C (PFC), FSL206MR (stb), FSFR1700XS, if they do not have visible damage to the case and an outright short circuit between the terminals, are usually checked by replacing.
- There is no image, there is sound, it reacts to the remote control, the channels are switched. In some cases, the image appears when turned on and disappears immediately.
Often in such cases, there is no backlighting of the LED panel. The reason for this may be an open circuit in the LED circuit, or a problem in stabilizing their power supply.
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 indicator on the front panel blinks, the TV does not turn on in operating mode, does not respond to the remote control.
If THOMSON T50E10DHU-01B has no picture, but there is sound, often the 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 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 often the main board MainBoard 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 normal limits, it is necessary to trace the passage of LVDS signals from the MainBoard with an oscilloscope, as well as synchronization 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 MT31LB motherboard should begin with checking the stabilizers and power converters necessary to power the microcircuits and matrix. If necessary, you should update or replace the software (software). If it is not possible to replace the MB (SSB) board, it is necessary to check the serviceability of its elements - TPA3110D2, W25Q64FVSIG, ATBM7811B. Defective components must be replaced.
Before changing the RF221ZN V4D17AA tuner, if it is not possible to tune to television channels, you should make sure that there are supply voltages, which must be measured at the corresponding tuner terminals and check the software for correctness. The pulses of the data exchange of the tuner with the processor can be monitored with an oscilloscope
We remind users again! Attempts to self-repair the THOMSON T50E10DHU-01B TV without the appropriate qualifications and the necessary experience can lead to its complete non-repairability!
DOWNLOAD SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> PE421C5/PE421C6 40-E421C6-PWC1XG Power supply
The appearance of the MainBoard MT31LB is shown in the figure below:MT31LB
External view of the power supply
The main features of the THOMSON T50E10DHU-01B device:
Installed matrix (LED panel) V500HJ1-LE8 REV.C1.
Matrix control uses the Timing Controller (T-CON) V500HJ1-XCME1.
The LED driver 40-50E411-DRC2LG is used to power the backlight LEDs.
The formation of the necessary supply voltages for all nodes of the THOMSON T50E10DHU-01B TV is carried out by the PE421C5 power module, or its analogs using FAN7930C (PFC), FSL206MR (stb), FSFR1700XS and K12A50D power switches.
MainBoard - the main board (motherboard) is an MT31LB module, using TPA3110D2, W25Q64FVSIG, ATBM7811B and others.
The RF221ZN V4D17AA tuner provides reception of television programs and tuning to channels.
LED TV THOMSON T50E10DHU-01B with LCD, diagonal size 49 "(124 cm) 16: 9 format. The declared brightness of the screen of 300 cd / m2 is provided by modern LED backlight LED. The ratio of maximum brightness to minimum (contrast) is not less 4000: 1 LCD panel uses Direct LED backlighting The design and technical capabilities of the TV allow viewing in high quality HD at a resolution of 1920x1080 pixels in graphics resolution in 1080p (Full HD). Supported media formats: MP3 , MPEG4, HEVC (H.265), Xvid, MKV, JPEG.
Speaker power of 10 W (2x5 W) is provided by two speakers. Uses NICAM stereo processing system and Sound Surround function.
External interface (communication with other devices) is supported by standard input and output connectors: antenna input (RF), AV, audio x2, component, VGA, HDMI x3, USB x2. A headphone jack is provided. The digital tuner has the ability to receive television channels in the DVB-T MPEG4, DVB-C, DVB-T2, DVB-S2 standards.
Overall dimensions: 1106x701x274 mm.
TV weight: 10.7 kg.
Attention! The panel of the THOMSON T50E10DHU-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.