Technical description and composition of the SAMSUNG UE49NU7120U TV, type of panel and modules used. Module 
composition.
Composition
Specifications
SAMSUNG UE49NU7120U
LCD TV LED Smart UHD UE49NU7120U | Year of manufacture: 2018
Screen diagonal: 48.5" (123 cm)
Screen Format: 16:9
Resolution: 3840x2160
Frequency of refreshment: 100 Hz
LED backlight: yes, Edge LED
Smart: yes. Wi-Fi support: yes
Operating system: Tizen
HD support: 4K UHD, HDR
Progressive scan: Yes
Digital tuner: DVB-T, DVB-T2, DVB-C, DVB-S
Teletext: Yes
Multimedia: MP3, WMA, MPEG4, HEVC (H.265), DivX, MKV, JPEG
Sound stereo: there is
Sound power: 20W (2x10W)
Acoustics: two speakers
Interface: AV, component, HDMI x3, USB x2, Ethernet (RJ-45), Wi-Fi 802.11ac, Miracast
TV weight: with stand: 13.5 kg
Without stand: 13.2 kg
Dimensions: with stand 1103x716x261mm
without stand 1103x638x60mm
Mains consumption: 140W
SAMSUNG LED
Model: UE49NU7120U
Chassis/Version: FA01
Panel: CY-NN049HGLV2V
LED backlight: AOT_49_NU7300_2X38 JLE490K2300-408BS-R7P-M-HF
LED driver (backlight): integrated into PSU
PWM LED driver: SLM4283A SOP-20 StepDown
MOSFET LED driver: N-FET TO-220F
Power Supply (PSU): BN44-00932B L55E6_NSM PSLF171301A
PWM Power: PFC, PWM
MOSFET Power: N-FET TO-220F
MainBoard: BN41-02635B BN94-13268E
IC MainBoard: CPU, eMMC: KLM4G1FEPD, SPI 25Q40, EEPROM: 24C512, DRAM, AUDIO: TAS5749M
TGENT: BN40-00331A
Control: IR: Y18 VNB V0.7 (CT171124) 45912A
General advice about LCD LED TV repair
Possible defects
- SAMSUNG UE49NU7120U TV does not turn on at all. No reaction to remote control and control buttons on the front panel. Indicator lights are not lit or blinking.
In such cases the power supply unit BN44-00932B is usually the defective one. Its output voltages should be measured and if they are not, the power switches (N-FET TO-220F) and the rectifier diodes should be checked for possible short circuits in the converters.
At breakdown of semiconductors in the secondary circuits of any converter, as a rule, it can work in the emergency short-circuit mode without output voltages, and at short circuit in the elements of the primary circuit most often the mains fuse and more rarely the current sensor at the source of the switch break down at once.
Mos-Fet switches used in switched-mode power supplies usually fail due to the failure of other elements, which can take it out of key mode, or cause it to exceed the maximum current or voltage. These may be the circuits feeding the PWM controller, the damping or frequency-retaining circuits, or the negative feedback elements in the stabilization circuit. PWM controllers (PFC) PFC, PWM, if there is no external damage and short circuit between the pins, are checked by replacing with known good ones.
- No picture, but there is sound and all other functions work. Sometimes at switching on the image appears for a second and then disappears.
Often in such cases there is no backlight of the LED panel. The cause can be found in the failure of the LEDs, in violation of the contact connections of the LED strips AOT_49_NU7300_2X38 JLE490K2300-408BS-R7P-M-HF, or in their power supply (LED-driver).
When trying to identify breaks in the lines of LEDs, keep in mind that it is difficult to do without disassembling the panel. For example, a current source is needed to open the PN-junctions connected in series.
If the SAMSUNG UE49NU7120U has no picture but sound, often the CY-NN049HGLV2V display backlight simply does not work. Moreover, in LED TVs usually fail LEDs inside the panel, less often the LED-driver.
In such cases you can see faintly visible image when external light hits the screen.
READ HOW TO REPAIR THE TV LED BACKLIGHT --------------> HERE.
To replace the LEDs requires disassembly of the LCD panel CY-NN049HGLV2V - a process which requires a master of experience and skill. We do not recommend to perform such works by yourself to owners of TV sets and craftsmen who have no experience in LCD panel repair
If there is no image, but backlighting works - the screen becomes slightly lighter when the TV is turned on, and in the open TV you can see the light through the holes in the body of the panel.
In this case the panel may be defective - damage to the strips, cables, for example, as a consequence of moisture after an unsuccessful washing of the screen, the T-CON board (Timing Controller) may be defective. But quite often the MainBoard BN41-02635B is defective and so is the software.
Then first it is necessary to check the panel power 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, you need to trace with an oscilloscope the LVDS signals from MainBoard BN41-02635B, as well as synchronizing signals to the driver stubs.
Filled or unsuccessfully washed LED TV screens can be restored in about half of the cases, usually, if there is no significant damage in the cables and panel bars.
- The LED on the front panel is blinking, the TV set does not turn on, and the remote control is unresponsive.
Repair or diagnosis of the motherboard BN41-02635B should begin with checking the stabilizers and power converters needed to power the chips and matrix. If necessary, update or replace the software (firmware). Board repair and chip replacement CPU, eMMC: KLM4G1FEPD, SPI 25Q40, EEPROM: 24C512, DRAM, AUDIO: TAS5749M are made with the necessary equipment and the appropriate element base. Malfunctions associated with the use of BGA processor soldering techniques can be localized by the heating method.
Before replacing the BN40-00331A tuner, if you cannot tune to the TV channels, make sure that the supply voltages are available and measure them on the respective pins of the tuner and check the software for correctness. The tuner-to-processor communication pulses can be checked with an oscilloscope
Once again, users must be reminded! The attempts to repair the SAMSUNG UE49NU7120U TV without the appropriate qualification and necessary experience can lead to its complete unrepairability!
Driver current limitation. BN44-00932B, SLM4283A. General information.
To decrease the backlight current you can proportionally increase the total resistance of the resistors R9101, R9201 (current sensor) at the source of the converter working switch on the BN44-00932B board or you can remove one of the resistors. Note that there are two more SMD resistors in parallel on the back side of the board.
BN44-00932B current backlight
More on MainBoard Repair
The MainBoard BN41-02635B is shown in the picture below:
BN41-02635B
MainBoard Appearance
The main features of the SAMSUNG UE49NU7120U:
A matrix (LED panel) CY-NN049HGLV2V is installed.
To power the backlight LEDs used converter, combined with a power supply, controlled by PWM controller SLM4283A SOP-20 StepDown. N-FET TO-220F switches are used as power elements of LED-driver.
The power supply module BN44-00932B or its analogues with the use of PFC, PWM and power switches of N-FET TO-220F type performs the formation of the necessary supply voltages for all the components of SAMSUNG UE49NU7120U.
MainBoard - the main board (motherboard) is a module BN41-02635B, using CPU, eMMC: KLM4G1FEPD, SPI 25Q40, EEPROM: 24C512, DRAM, AUDIO: TAS5749M and others.
The BN40-00331A tuner provides TV program reception and channel tuning.
Instructions and updates
There are download files for the model UE49NU7120UXRU from the manufacturer:
Latest software updates, firmwares (latest firmwares):
File type File name Version Date Size
Update instructions 2018_TV_Firmware_Upgrade_Instruction_T-KTM2LDEUC.pdf 1.0 23.06.2020 0.5 Mb
Update file (USB) T-KTM2LDEUC.zip 1310.4 02.11.2020 1117.74 Mb
Update file (USB) T-KTM2LDEUC_1310.4.exe 1310.4 02.11.2020 1117.49 Mb
Update file (USB) T-KTM2LDEUC_1310.4_RU.exe 1310.4 02.11.2020 1117.49 Mb
Instruction manuals and User Manuals:
File Type File Name Version Date Size
User manual BN68-08987G-02_UNU7100X_RU_L02_180710.1.pdf 02 13.07.2018 1.22 Mb
BN68-08995L-01_QSG_UNU7100X_CIS_180314.0.pdf 01 23.05.2018 0.3 Mb
Instruction PDF ENG_KM2DVBEUN-3.0.2_181205.0.0.pdf 3.0.2 02.01.2019 11.33 Mb
Instructions PDF RUS_KM2DVBEUN-3.0.2_181205.0.0.pdf 3.0.2 02.01.2019 11.42 Mb
You can download the files from the manufacturer's website for the model UE49NU7120UXRU.
SAMSUNG UE49NU7120U LCD TV CY-NN049HGLV2V, measuring 48.5" (123 cm) diagonally in 16:9 aspect ratio. This model uses a panel with an end arrangement of LEDs in the display backlight - Edge LED.
Matrix CY-NN049HGLV2V and MainBoard software BN41-02635B able to realize the image in the highest quality UHD at 3840x2160 pixels in 4K UHD, HDR. Image processing is made by modern technology High Dynamic Range (HDR) with an extended range of brightness gradation.
The UE49NU7120U has built-in SMART software and Tizen Operating System. Connection to the network can be made via Wi-Fi wireless connection. Supported media formats: MP3, WMA, MPEG4, HEVC (H.265), DivX, MKV, JPEG.
The sound speaker system has a capacity of 20 W (2x10 W) and is equipped with two loudspeakers. NICAM stereo sound processing system and Sound Surround surround function are used.
Communication with other devices via an external interface is supported by standard inputs and outputs: antenna input (RF), AV, component, HDMI x3, USB x2, Ethernet (RJ-45), Wi-Fi 802.11ac, Miracast. The digital tuner is capable of receiving DVB-T, DVB-T2, DVB-C, DVB-S, DVB-S2 TV channels.
The power consumption of the worker in mains mode is 140 W. Power supply BN44-00932B.
Overall dimensions: with stand 1103x716x261 mm, without stand 1103x638x60 mm.
TV weight: with stand 13.5 kg, without stand 13.2 kg.
Warning. The panel CY-NN049HGLV2V of the SAMSUNG UE49NU7120U LED TV is an expensive and unreliable part of it.
Do not allow any 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.