Technical description and composition of the THOMSON T48D16SF-01B TV, panel type and modules used. The composition of the modules.THOMSON LED
Model: T48D16SF-01B
Chassis / Version: TP.S512.PC821
Panel: LVF480SSDX E8 V1
LED backlight: LSC480HN08-G01
T-CON: 15_YR48FF11MB7S4L V0.2 LSC480HN08-G01; LTF62B0 RT6929 RT6930.
LED driver (backlight): integrated into MainBoard
PWM LED driver: LD7750
MOSFET LED driver: 80R900P
Power Supply (PSU): integrated into MainBoard
PWM Power: LD5530 (Stb), NCP1607B (PFC), LD7750 (LED-DRV)
MOSFET Power: 70R900P (Stb), MDF13N50B (PFC), 80R900P (LED-DRV)
MainBoard: TP.S512.PC821
IC MainBoard: S2T512, GD25Q64BSIG, TPA3110D2
Tuner: RT710 & XF-3SDT-H, T3 / 1 R 1/617
Specifications T48D16SF-01B
THOMSON T48D16SF-01B
General recommendations for TV LCD LED repair
Possible malfunctions
- TV THOMSON T43D15SF-01B does not turn on and does not give any signs of turning on, does not respond to control buttons and to the remote control.
First of all, in such cases, you should make sure that the common switching power supply (SMPS) - the AC / DC voltage converter of the mains voltage - is working. All source elements in this TV model are located on the MainBoard TP.S512.PC821. Then its output voltages should be measured and, in case of their complete or partial absence, it is necessary to check the serviceability of the power switches (70R900P (Stb), MDF13N50B (PFC), 80R900P (LED-DRV)) and rectifier diodes of the converters for a possible short circuit.
In case of breakdowns of semiconductors in the secondary circuits of any converter, as a rule, it can operate in an emergency mode of short circuit without output voltages, and with a short circuit in the elements of the primary circuit, the mains fuse most often breaks off immediately and less often the current sensor in the source of the key.
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) LD5530 (Stb), NCP1607B (PFC), LD7750 (LED-DRV), 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 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.
Usually, in such cases, a malfunction is detected in the LED panel backlight nodes. The reason for this may be an open circuit in the LED circuit, or a problem in stabilizing their power supply.
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 turn on, does not respond to the remote control. The indicator blinks or signals the standby mode.
Repair or diagnostics of the TP.S512.PC821 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). When repairing the MB board, you need to check its components S2T512, GD25Q64BSIG, TPA3110D2. Defective elements should be replaced. If chips with BGA soldering technology are used, the problem in its implementation is detected by local heating of the chip.
Before changing the tuner RT710 & XF-3SDT-H, T3 / 1 R 1/617, if it is not possible to tune to TV channels, make sure that there are supply voltages, which must be measured on the corresponding terminals of the tuner and check the software for correctness. The pulses of the data exchange of the tuner with the processor can be monitored with an oscilloscope.
If THOMSON T48D16SF-01B has no picture, but there is sound, often the display backlight LVF480SSDX E8 V1 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 LVF480SSDX 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 TP.S512.PC821 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 use an oscilloscope to trace the passage of LVDS signals from MainBoard TP.S512.PC821, as well as synchronizing 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.
Attention! Users and owners of T43D15SF-01B TVs who do not have the appropriate qualifications, knowledge and experience are strongly discouraged from trying to repair themselves in order to avoid negative consequences that can lead to the complete non-repairability of the device ...
DOWNLOAD SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> MainBoard TP.S512.PC821
The appearance of the MainBoard TP.S512.PC821 is shown in the figure below:TP.S512.PC821
TP.S512.PC821 can be used in TVs:
AKAI LEA-49K40M (Panel LSC490HN04-W), DEXP F48B7000V (Panel LCS480HN07), SHIVAKI STV-48LED15 (Panel LSC480HN05-B01), SHIVAKI STV-49LED17 (Panel LSC490HN03-W), SHIVAKI STV-50LED13 (Panel V500HJ1-PE8), THOMSON T48D16SF-01B (Panel LVF480SSDX E8 V1).
The main features of the THOMSON T48D16SF-01B device:
Installed matrix (LED panel) LVF480SSDX E8 V1.
Matrix control uses Timing Controller (T-CON) 15_YR48FF11MB7S4L.
To power the backlight LEDs, a converter combined with the TP.S512.PC821 main board is used, controlled by the LD7750 PWM controller. The keys of the 80R900P type are used as the power elements of the LED driver.
The power module is combined with the MainBoard and is made according to the AC / DC flyback voltage converter using LD5530 (Stb), NCP1607B (PFC), LD7750 (LED-DRV) microcircuits and power switches of the 70R900P (Stb), MDF13N50B (PFC), 80R900P ( LED-DRV).
MainBoard - the main board (motherboard) is a TP.S512.PC821 module, using S2T512, GD25Q64BSIG, TPA3110D2 and others.
The tuner RT710 & XF-3SDT-H, T3 / 1 R 1/617 provides reception of television programs and tuning to channels.
LED TV THOMSON T48D16SF-01B with LCD LVF480SSDX, diagonal size 48 "(122 cm) 16: 9 format. The declared brightness of the screen of 240 cd / m2 is provided by modern LED backlight LED. less than 3000: 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 graphic resolution at 1080p (Full HD). decoded in analog systems PAL, SECAM, NTSC Digital signal formation (graphic format) is performed in 480i, 480p, 576i, 576p, 720p, 1080i, 1080p standards Supported multimedia formats: MP3, WMA, MPEG4, MKV, JPEG.
Speaker power 20 W (2x10 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, component, SCART, VGA, HDMI x3, MHL, USB. A headphone jack is provided. A standard VGA (D-Sub 15) connector is used to connect a laptop or computer. This interface supports resolutions: 640x480, 800x600, 1024x768, 1280x1024, 1360x768. The digital tuner has the ability to receive television channels in the DVB-T MPEG4, DVB-C, DVB-T2, DVB-S2 standards.
The power consumed by the TV from the network in the operating mode is not more than 110 W.
Dimensions: with stand 1097x969x210 mm, without stand 1097x662x79 mm.
TV weight: 13.3 kg.
Attention! The LVF480SSDX E8 V1 panel of the THOMSON T48D16SF-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 ................