Technical description and composition of the THOMSON T32ED05U-01B TV, panel type and modules used. The composition of the modules.THOMSON LED
Model: T32ED05U-01B T32ED05U
Chassis / Version: 3MS82AX
Panel: LVW320CSDX E3 V7
LED driver (backlight): integrated into MainBoard
PWM LED driver: OB3363QPA (OB3368QPA)
Power Supply (PSU): integrated into MainBoard
PWM Power: PWM SOT23-6
MainBoard: TP.MS18VG.P78 3MS82AX
IC MainBoard: CPU: MST3M182VGC-LF -Z1, Spi Flash: 25Q32, EEPROM: 24C32, AUDIO: TPA3110LD2
Tuner: R620D
Specifications T49D21SF-01B
THOMSON T32ED05U-01B
General recommendations for TV LCD LED repair
Possible malfunctions
- THOMSON T32ED05U-01B TV does not turn on. There are no signs of operability. The indicators on the front panel do not light or blink, the TV does not respond to the remote control and control buttons.
In such cases, the common power supply is often faulty - the AC / DC converter of the mains voltage, which is combined with the elements of the TP.MS18VG.P78 main board. It is necessary to measure the output voltages in its secondary circuits, and if they are completely absent, 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, the converter, as a rule, can operate in an emergency mode in the short-circuit mode, and in the event of a short circuit in the power elements of the primary circuit, the mains fuse is usually cut off.
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) PWM SOT23-6 are usually checked by replacing them with new ones, or knowingly working.
- There is no picture, but there is sound and reaction to the remote control. Or, for a second, the image may appear immediately after switching on.
In some of these cases, the malfunction is caused by the lack of display backlighting. 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.
It should be remembered that it is not possible to determine an open circuit in the LED lines without disassembling the panels using a tester or multimeter without an additional device, for example, a current source. To open all PN junctions connected in series at once, a voltage of several tens of volts may be required. Then you need to open the panel and check each LED separately with a multimeter. If the capabilities of your multimeter do not allow opening the LED in the forward direction or dual LEds are used, then the PN transition of the emergency zener diode can indirectly serve as an indicator of serviceability. In the event of a malfunction of the LED-a, the PN-junction of the zener diode will either be cut off or broken into the K / Z.
- The TV does not go into operation, does not respond to the remote control. The indicator on the front panel is on or blinking.
If THOMSON T32ED05U-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 TP.MS18VG.P78 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). 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 - CPU: MST3M182VGC-LF -Z1, Spi Flash: 25Q32, EEPROM: 24C32, AUDIO: TPA3110LD2 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.
If there is no reception of television channels, but the TV is working properly from external devices, first of all, you need to check the supply voltage of the R620D tuner and update the software. I2C communication pulses must be monitored with an oscilloscope.
Users and owners of TVs need to remember that attempts to self-repair a THOMSON T32ED05U-01B TV without the appropriate qualifications and necessary experience can lead to serious negative consequences!
DOWNLOAD FIRMWARE FOR SPI FLASH -----------> THOMSON T32ED05U-01B, Main: TP.MS18VG.P78 3MS82AX, Panel: LVW320CSDX E3 V7
DOWNLOAD SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> THOMSON T42E02HU-01B Chassis TP.MS18VG.P78
To reduce the backlight current in LED drivers with OB3363QP (16 pin) controller, the total resistance of the resistors from pin 5 (ISET) to the case should be proportionally increased.
Additional MainBoard Repair
The appearance of MainBoard TP.MS18VG.P78 is shown in the figure below:
TP.MS18VG.P78
TP.MS18VG.P78 can be used in TVs:
THOMSON T42E02HU-01B (Panel LVF420AUDX E8 V1), THOMSON T32ED05U-01B T32ED05U (Panel LVW320CSDX E3 V7), THOMSON T32E02U-01B (Panel A320HE2A05-7A), THOMSON T40ED06HU T40ED06HU-01B (Panel LVF400SSDX E7 V2).
The main features of the THOMSON T32ED05U-01B device:
Installed matrix (LED panel) LVW320CSDX E3 V7.
To power the backlight LEDs, a converter combined with the main board TP.MS18VG.P78 is used, controlled by the OB3363QPA PWM controller (OB3368QPA).
The power module is combined with the MainBoard and is made according to the AC / DC flyback voltage converter using PWM SOT23-6 microcircuits.
MainBoard - the main board (motherboard) is a TP.MS18VG.P78 module, using CPU chips: MST3M182VGC-LF -Z1, Spi Flash: 25Q32, EEPROM: 24C32, AUDIO: TPA3110LD2 and others.
The R620D tuner provides reception of television programs and tuning to channels.
LED TV THOMSON T32ED05U-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 T32ED05U-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.