Technical description and composition of the THOMSON T32D19DHS-01B TV, panel type and modules used. The composition of the modules.THOMSON LED
Model: T32D19DHS-01B
Chassis / Version: MT56SE
Panel: LVW320CSDX E19 V19
T-CON: MT3151A05-5-XC-9
LED driver (backlight): integrated into PSU
Power Supply (PSU): integrated into MainBoard
PWM Power: PWM SOT23-6
MOSFET Power: TO-252
MainBoard: 40-MT56SE-MAB2HG
Tuner: ST55WM-2-E9
Control: IR: 40-32RD160-IRB2LG
Specifications T32D19DHS-01B
THOMSON T32D19DHS-01B
General recommendations for TV LCD LED repair
Possible manifestations of malfunctions
- THOMSON T32D19DHS-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.
A malfunction in such cases, first of all, should be sought in the power elements of a switching power supply (SMPS) - a mains voltage converter (AC / DC), which in this TV model is combined with the MainBoard 40-MT56SE-MAB2HG main board. It is necessary to measure its secondary output voltages, and if they are absent, check the power switches (TO-252) and rectifier diodes in the converters for a 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.
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 PWM SOT23-6, 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 picture, but there is sound, it reacts to the remote control. Or the image appears when turned on and immediately disappears
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 check the LED strips for breakage without disassembling the panel, for example, a current source will help. It is impossible to open series-connected PN junctions with a simple multimeter; a voltage of the order of several tens of volts is required.
- 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 T32D19DHS-01B has no picture, but there is sound, often the display backlight LVW320CSDX E19 V19 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 LVW320CSDX 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-MT56SE-MAB2HG 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 the MainBoard 40-MT56SE-MAB2HG with an oscilloscope, 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-MT56SE-MAB2HG 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).
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 ST55WM-2-E9 tuner and update the software. I2C communication pulses must be monitored with an oscilloscope.
Once again, we remind TV users: do not try to repair yourself without the appropriate knowledge, experience and the necessary qualifications! Trust the repair to professionals with sufficient experience in the field of electronic repair.
Additional MainBoard RepairThe appearance of the MainBoard 40-MT56SE-MAB2HG is shown in the figure below:
40-MT56SE-MAB2HG
The main features of the THOMSON T32D19DHS-01B device:
Installed matrix (LED panel) LVW320CSDX E19 V19.
Matrix control uses the Timing Controller (T-CON) MT3151A05-5-XC-9.
A converter combined with a power supply is used to power the backlight LEDs.
The power module is combined with the MainBoard and is made according to the AC / DC flyback voltage converter using SOT23-6 PWM microcircuits and TO-252 type power switches.
MainBoard - The main board (motherboard) is a 40-MT56SE-MAB2HG module.
The ST55WM-2-E9 tuner provides reception of television programs and tuning to channels.
LED TV THOMSON T32D19DHS-01B with LCD LVW320CSDX, diagonal size 32 "(81 cm) 16: 9 format. arrangement of LEDs - Direct LED.It is possible to view in high quality HD at a resolution of 1366x768 pixels in 720p standard (HD Ready).
The T32D19DHS-01B TV is equipped with SMART software, built-in applications and the ability to work on the Internet. Internet connection can be made via Wi-Fi wireless connection. Supported media formats: MP3, WMA, MPEG4, Xvid, DivX, MKV, JPEG.
Speaker power of 10 W (2x5 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, HDMI x2, MHL, USB x2, Ethernet (RJ-45), Wi-Fi, WiDi. A headphone jack is provided. 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 50 W.
Dimensions: with stand 733x480x177 mm, without stand 733x444x92 mm.
TV weight: 4.3 kg.
Attention! The LVW320CSDX E19 V19 panel of the THOMSON T32D19DHS-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.