Technical description and composition of the THOMSON T40D21SF-01B TV, panel type and modules used. The composition of the modules.THOMSON LED
Model: T40D21SF-01B
Chassis / Version: P75-3463GSXV6.1
Panel: LSC400HN02-B
LED backlight: 40660 35022388 2016-06-16 REV-00
T-CON: 15Y_40GF11BMB7S4LV0.1 REV 0.3
LED driver (backlight): integrated into MainBoard
Power Supply (PSU): integrated into MainBoard
MainBoard: P75-3463GSXV6.1
IC MainBoard: CPU: MSD3463GSA, SPI FLASH: MX25L6406E
Control: IR: 35022 REV: 2.0
Specifications T40D21SF-01B
THOMSON T40D21SF-01B
General recommendations for TV LCD LED repair
Possible manifestations of defects
- The THOMSON T40D21SF-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.
A malfunction in such cases should first of all be looked for 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 P75-3463GSXV6.1 main board. In the absence of the necessary supply voltages in the secondary circuits of the converters, it is necessary to check the power switches and rectifier diodes for possible partial or complete breakdown.
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 keys used in switching power supplies usually fail due to a malfunction of other elements, which can disable it in key mode, or provoke an excess of the maximum current or voltage values. These can be circuits supplying the PWM controller, damper or frequency setting circuits, or OOS (negative feedback) elements in the stabilization circuit. PWM controllers (PWM), in the absence of external damage and a short circuit between the terminals, are checked by replacing them with a known good one.
- 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.
A malfunction is usually in these cases most likely in the backlight units of the display matrix. 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.
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 TV does not turn on, does not respond to the remote control. The indicator blinks or signals the standby mode.
If the THOMSON T40D21SF-01B has no picture, but there is sound, often the backlight of the LSC400HN02-B display 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 LSC400HN02-B - 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 P75-3463GSXV6.1 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 MainBoard P75-3463GSXV6.1 with an oscilloscope, as well as synchronization signals to 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 P75-3463GSXV6.1 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 - CPU: MSD3463GSA, SPI FLASH: MX25L6406E 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.
Attention to users! Self-repair of the THOMSON T40D21SF-01B TV without the appropriate qualifications and the necessary experience can lead to its complete non-repairability!
Additional MainBoard RepairThe appearance of the MainBoard P75-3463GSXV6.1 is shown in the figure below:
P75-3463GSXV6.1
The main features of the THOMSON T40D21SF-01B device:
Installed matrix (LED panel) LSC400HN02-B.
Matrix control uses Timing Controller (T-CON) 15Y_40GF11BMB7S4LV0.1.
A converter combined with the main board P75-3463GSXV6.1 is used to power the backlight LEDs.
The power module is combined with the MainBoard and is made according to the AC / DC flyback converter circuit.
MainBoard - the main board (motherboard) is a P75-3463GSXV6.1 module, using CPU chips: MSD3463GSA, SPI FLASH: MX25L6406E and others.
LED TV THOMSON T40D21SF-01B with LCD LSC400HN02-B, diagonal size 40 "(102 cm) 16: 9 format. The declared brightness of the screen of 300 cd / m2 is provided by modern LED backlight LED. ) not less than 4000: 1. The LCD-panel uses direct backlighting with rear-mounted LEDs - Direct LED. The design and technical capabilities of the TV provide viewing in high quality HD at a resolution of 1920x1080 pixels in graphic resolution according to the standard 1080p (Full HD). Formats are supported. multimedia: MP3, MPEG4, HEVC (H.265), Xvid, 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, 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.
Dimensions: with stand 919x593x228 mm, without stand 919x540x86 mm.
TV weight: with stand: 9.9 kg, without stand: 7.5 kg.
Attention! The LSC400HN02-B panel of the THOMSON T40D21SF-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.
