Technical description and composition of the THOMSON T49FSL5140 TV, type of panel and modules used. Module composition.
THOMSON LED
Model: T49FSL5140
Chassis/Version: T.MT5510S.786
Panel: LVF490CSDX
LED driver (backlight): integrated into MainBoard
PWM LED driver: OB3365RP DIP16
MOSFET LED driver: MDF13N50 13A 500V TO-220F
Power Supply (PSU): SHG6004C-101H
PWM Power: FA1A60N SOP-8, FA6B20N SOP-16
MOSFET Power: MMD60R580Q
MainBoard: T.MT5510S.786
IC MainBoard: CPU: MT5659DFNT, eMMC: KLM8G1GEME, AUDIO: TAS5707PHPR
Tune: CDT-9NT372-SL50 & SAT
Specifications T49FSL5140
THOMSON T49FSL5140
General recommendations for LCD LED TV repair
Possible trouble spots
- THOMSON T49FSL5140 TV does not turn on. There is no indication of any function. Indicators on the front panel are not glowing or blinking, the TV does not respond to the control buttons.
The SHG6004C-101H Power Module is often the defective one. It is necessary to measure its output voltages, and in case of their absence (full or partial), you should check the serviceability of the power switches (MMD60R580Q) of the converters and the rectifier diodes for possible short circuit.
If the diodes in the secondary circuits breakdown, the inverter can operate in the short-circuit emergency mode without output voltages, and if the power elements in the primary circuit are shorted, the mains fuse and/or the current sensor at the source of the key usually break down.
Breakdown of Mos-Fet switches used in pulse power supplies is often caused by faults in other elements, e.g. in the PWM power supply circuit, in the frequency-retaining or damping circuits, and in the Negative Feedback Stabilization circuit. PWM chips (PWM) FA1A60N SOP-8, FA6B20N SOP-16 are usually checked by replacement with new or known good ones.
- No picture, but there is sound and the remote responds. Or the image appears at power on and immediately disappears.
Often in such cases there is no backlight of the LED panel. The cause can sometimes be in the power LEDs, but more often in their failure (breakdown or breakage), sometimes in violation of the contact between the LED strips.
It is impossible to detect a breakage in the line of LEDs without disassembling the panel with a simple multimeter. LEDs are connected in series and to open their transitions, you will need a voltage of several tens of volts. Ideally a current source would be suitable for this purpose. You can open up the panel and check each LED separately. Usually, Chinese multimeters will light up one 3 volt LED slightly if you connect the probes to it in the forward direction (red probe to the anode, black probe to the cathode). For twin 6-volt LEDs, the PN junction of its faulty regulator can be a good indicator. If the LED is faulty, it will either be open or shorted.
READ HOW TO REPAIR THE TV LED BACKLIGHT --------------> HERE.
- The TV set does not enter the operation mode, the remote control does not respond. Front panel LED is either constantly on or is blinking.
Repair or diagnostic of the T.MT5510S.786 motherboard should begin with checking the stabilizers and power converters necessary to power the microcircuits and the matrix. If necessary, you should update or replace the software (firmware). Complex repair of MB board (SSB) in some cases is possible and practiced by repairmen. To do this, you should check and, if necessary, replace the elements CPU: MT5659DFNT, eMMC: KLM8G1GEME, AUDIO: TAS5707PHPR. BGA chip failures are usually easy to diagnose by heating.
Before replacing the CDT-9NT372-SL50 & SAT tuner, if you cannot tune to the TV channels, make sure the supply voltages are present and measure at the respective pins of the tuner and check the software for correctness. The communication pulses from the tuner to the processor can be checked with an oscilloscope.......
If the THOMSON T49FSL5140 does not have an image, but there is sound, the display backlight often 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 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, you need to check the panel supply voltage, the 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 use an oscilloscope to trace the passage of LVDS signals from the MainBoard, 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.
I recommend owners of the TV set T49FSL5140 to address only to the qualified specialists with necessary experience for repair! Attempts to repair yourself without proper knowledge and skills can lead to irreversible negative consequences!
DOWNLOAD SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> Chassis T.MT5510S.786
DOWNLOAD SCHEMATIC DIAGRAM / POWER SUPPLY ------------------> SHG6004C05-101HA Power supply
AFTER THE REPAIR OF THE BACKLIGHT. INFORMATION FROM THE MASTER.
Decreased backlight current from 580 mA to 350 mA - removed R239 68 KOhm resistor (47 KOhm was left) on pin 2 of ISET chip OB3365RP on SHG6004C-101H board.
More on MainBoard repair
The appearance of the MainBoard T.MT5510S.786 is shown in the picture below:
T.MT5510S.786
MainBoard Appearance
The main features of THOMSON T49FSL5140:
LVF490CSDX matrix (LED panel) is installed.
To power the LED backlight using a converter, combined with the main board T.MT5510S.786, is controlled by a PWM controller OB3365RP DIP16. MDF13N50 13A 500V TO-220F switches are used as power elements of LED-driver.
Required supply voltages for all TV THOMSON T49FSL5140 components are generated by the SHG6004C-101H power module or its analogues using FA1A60N SOP-8, FA6B20N SOP-16 chips and MMD60R580Q type power keys.
MainBoard - the main board (motherboard) is a module T.MT5510S.786, with the use of chip CPU: MT5659DFNT, eMMC: KLM8G1GEME, AUDIO: TAS5707PHPR and others.
The CDT-9NT372-SL50 & SAT tuner provides TV program reception and channel tuning.
THOMSON T49FSL5140 LED TV with a 48.5" (123 cm) diagonal 16:9 LCD display. Declared brightness of 260 cd/m² screen is provided by modern LED backlighting. Maximum brightness to minimum brightness ratio (contrast ratio) is not less than 4000:1. The LCD-panel uses direct backlighting with a rear arrangement of LEDs - Direct LED.
The design and capabilities of the TV realize a high quality HD image at a resolution of 1920x1080 pixels in 1080p (Full HD) graphic decomposition.
The T49FSL5140 comes with SMART software, built-in applications and Internet connectivity. You can connect to the Internet using Wi-Fi wireless connection. Supports multimedia formats: MP3, WMA, MPEG4, HEVC (H.265), MKV, JPEG.
Two speakers provide sound power of 16 W (2x8 W). NICAM stereo signal processing system and Sound Surround surround sound function are used.
External interface (connection to other devices) is supported by standard input and output connectors: antenna input (RF), AV, HDMI x3, USB x2, Ethernet (RJ-45), Wi-Fi. There is a headphone jack. The digital tuner is capable of receiving DVB-T, DVB-T2, DVB-C, DVB-S, DVB-S2 TV channels.
The power consumed by the TV in the mains mode is 100 W.
Overall dimensions: with stand 1102x686x225 mm, without stand 1102x649x80 mm.
The weight of the TV: 10.4 kg.
Warning! The panel of your THOMSON T49FSL5140 LED TV is an expensive and unreliable part of the TV.
Avoid any kind of impact on the glass and pressure on the screen surface to avoid damaging the LED panel!
It is also not safe to get liquid on the screen. Sometimes one drop is enough if it drips down the glass onto the cables and the TV becomes unrepairable.