Technical description and composition of the THOMSON T40E04DHU-01B TV, panel type and modules used. The composition of the modules.THOMSON LED
Model: T40E04DHU-01B
Chassis / Version: HK-T.SP9202V54
Panel: LVF400SSDX E7 V3
LED driver (backlight): integrated into PSU
Power Supply (PSU): 3904C81-PBE039-PW4
MainBoard: HK-T.SP9202V54
IC MainBoard: Spi Flash: 25Q32BSIG
Specifications T49D21SF-01B
THOMSON T40E04DHU-01B
General recommendations for TV LCD LED repair
Possible malfunctions
- The THOMSON T40E04DHU-01B TV does not turn on, does not respond to the remote control and control panel buttons, the indicators do not light up or flash.
In some of these cases, the fault is detected in the power module 3904C81-PBE039-PW4. Its output voltages should be measured, and if they are absent, check the serviceability of the power switches of the converters and rectifier diodes for the probability of a short circuit.
In the event of diode breakdowns in the secondary circuits, the converter can operate in an emergency mode of short circuit without output voltages, and in the event of a short circuit in the power elements of the primary circuit, the mains fuse and / or the current sensor in the source of the key usually breaks off.
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), 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 picture, but there is sound and reaction to commands from the remote control. Or the image appears immediately after switching on and disappears.
In such cases, a malfunction of the LED panel backlighting elements is most likely. The reason for this may be an open circuit in the LED circuit, or a problem in stabilizing their power supply.
To check the health of the LED circuit, it is better to use a current source with a maximum voltage of 200V. We do not recommend using any voltage sources for this purpose. You can check each LED separately with a simple Chinese multimeter (powered by 9 volts) in the P-N transition test mode. If you connect the red probe of the multimeter to the anode of the LED, and the black one to its cathode, then the 3-volt LED will light up slightly, and in the opposite direction you can detect the transition of the emergency zener diode. The serviceability of the PN junction of the Zener diode indirectly indicates the serviceability of the LED.
If THOMSON T49D21SF-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.
- 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 HK-T.SP9202V54 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). In some cases, to repair the MB (SSB) board, it may be necessary to replace the chips - Spi Flash: 25Q32BSIG with new or known good ones. In cases where BGA technologies are used, defects are usually localized by heating.
Users and owners of TVs need to remember that attempts to self-repair a THOMSON T40E04DHU-01B TV without the appropriate qualifications and the necessary experience can lead to serious negative consequences!
DOWNLOAD FIRMWARE FOR SPI FLASH -----------> THOMSON T40E04DHU-01B, Main: HK-T.SP9202V54, Panel: LVF400SSDX E7 V3
The appearance of the MainBoard HK-T.SP9202V54 is shown in the figure below:HK-T.SP9202V54
HK-T.SP9202V54 can be used in TVs:
THOMSON T40E04DHU-01B (Panel LVF400SSDX E7 V3), THOMSON T50E80DHU (Panel V500HJ1-LE1 REV.C1), THOMSON T32E04DU T32E04DU-01B (Panel A320HE2A04-11).
External view of the power supply
The main features of the THOMSON T40E04DHU-01B device:
Installed matrix (LED-panel) LVF400SSDX E7 V3.
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 T40E04DHU-01B TV is carried out by the 3904C81-PBE039-PW4 power module, or its analogs.
MainBoard - the main board (motherboard) is an HK-T.SP9202V54 module, using Spi Flash chips: 25Q32BSIG and others.
LED TV THOMSON T40E04DHU-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 T40E04DHU-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.