Technical description and composition of SAMSUNG UE49NU8070U TV, type of panel and modules used. Module composition.
SAMSUNG LED
Model: UE49NU8070U
Chassis/Version: FB02
Panel: CY-SN049HLV2H
LED driver (backlight): integrated into PSU
PWM LED driver: SOP-20
MOSFET LED driver: TO-252
Power Supply (PSU): BN44-00878C PSLF181E10A
PWM Power: PFC, PWM
MOSFET Power: TO-220F
MainBoard: BN41-02636A BN94-12925G
IC MainBoard: CPU, eMMC, DRAM, AUDIO, DC/DC
Tube: DVB-T2 & SAT
Specifications UE49NU8070U
SAMSUNG UE49NU8070U
General recommendations for LCD LED TV repair
Possible Fault Findings
- SAMSUNG UE49NU8070U TV does not turn on. No signs of performance. The indicators on the front panel are not lit or blinking, the TV does not respond to the control buttons.
Usually the power supply module BN44-00878C fails with such symptoms. It is necessary to check the output voltages and in case of their complete absence check the power switches (TO-220F) and the rectifier diodes for possible short circuit.
If there is a breakdown in the secondary circuits, the inverter may be short-circuited, and if there is a short in the primary circuit elements, the mains fuse usually blows.
Mos-Fet power switches used in switching power supplies sometimes fail due to the failure of some other element that can take it out of key mode, or create exceeding the maximum allowable parameters of the switch. These can be the elements that feed the PWM controller, the frequency or damping circuits, or the negative feedback elements in the stabilization circuit. PFC, PWM controllers, if there is no visible damage or outright short circuits between pins, are checked by replacing with new or known good ones.
- No picture, sound is present, and the remote control responds. Or the image may appear for a second and then disappear at once.
As a rule, in such cases there is no display backlight. The reason for this may be a breakage in the circuit of the LEDs, or a problem in stabilizing their power supply.
When trying to identify a breakage in the lines of LEDs, you should 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.
- The TV does not turn on, the LED indicates standby or operation mode, or blinks.
Repair or diagnosis of the motherboard BN41-02636A should begin with checking the stabilizers and power converters needed to power the chips and matrix. If necessary, the software (software) should be updated or replaced. Often the MB (SSB) board must be replaced if it has complex faults that are difficult to detect. If you try to repair, you should check its elements - CPU, eMMC, DRAM, AUDIO, DC/DC and replace faulty chips with new ones. Some faults may be associated with the use of modern Main Board BGA soldering technology. Usually such defects are detected by local heating of the chip.
If the SAMSUNG UE49NU8070U has no picture but sound, often the CY-SN049HLLV2H display backlight simply does not work. Moreover, in LED TVs usually fail the LEDs inside the panel, less often the LED-driver.
In such cases you can see a faintly visible image when external light hits the screen.
To replace the LEDs requires disassembly of the LCD panel CY-SN049HLLV2H - 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 switched 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 BN41-02636A 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 BN41-02636A, as well as synchronizing signals to the driver stubs.
The screens of LED TVs that are flooded or poorly washed can be restored in about half of the cases, usually, if there is no significant damage in the cables and panel bars.
Before replacing the DVB-T2 & SAT tuner, if you cannot tune to the TV channels you must make sure that the supply voltages are present and measure at the respective pins of the tuner and check the software for correctness. The tuner to processor exchange pulses can be checked with the oscilloscope
Warning! We strongly recommend for UE49NU8070U TV-set users and owners, who have no appropriate qualification, knowledge and experience not to try to repair the device by themselves in order to avoid the negative consequences that may lead to the complete uselessness of the device.
More information about MainBoard repairs
The exterior of the MainBoard BN41-02636A is shown in the illustration below:
BN41-02636A
MainBoard Appearance
The main features of the SAMSUNG UE49NU8070U:
CY-SN049HLLV2H matrix (LED panel) is installed.
To power the LED backlight the converter is used, combined with the power supply, controlled by a PWM controller SOP-20. As the power elements of LED-driver are used switches of TO-252 type.
The power supply module BN44-00878C or its analogues with the use of PFC, PWM chips and TO-220F-type power keys performs the formation of the necessary supply voltages for all the nodes of SAMSUNG UE49NU8070U TV MainBoard - The main board (motherboard) is a BN41-02636A module, using CPU, eMMC, DRAM, AUDIO, DC/DC and other chips.
The DVB-T2 & SAT tuner provides TV program reception and channel tuning.
Instructions and updates
There are ue49nu8070uxua downloads available from the manufacturer:
Latest software updates, firmwares (latest firmwares):
File type File name Version Date Size
Update instructions 2018_TV_Firmware_Upgrade_Instruction_T-KTM2DEUC.pdf 1.0 23.06.2020 0.51 Mb
Update file (USB) T-KTM2DEUC.zip 1310.4 02.11.2020 1332.96 Mb
Update File (USB) T-KTM2DEUC_1310.4.exe 1310.4 02.11.2020 1332.65 Mb
User Manuals (User Manuals):
File Type File Name Version Date Size
Quick Start Guide BN68-08995H-01_QSG_UNU8000F_CIS_180314.0.pdf 01 18.04.2018 0.39 Mb
Instruction PDF ENG_KM2DVBEUN-3.0.2_181205.0.pdf 3.0.2 02.01.2019 11.33 Mb
You can download the files from the manufacturer's website for the ue49nu8070uxua model.
SAMSUNG UE49NU8070U TV with CY-SN049HLLV2H LCD display, measuring 48.5" (123 cm) diagonally in 16:9 aspect ratio. The required screen brightness of 450 cd/m² is provided by the LED backlight. Contrast, as the ratio of maximum brightness to minimum brightness, is 3000:1. This model uses a panel with an end arrangement of LEDs in the display backlight - Edge LED.
CY-SN049HLV2H matrix and MainBoard software BN41-02636A are 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 UE49NU8070U has built-in SMART software and Tizen Operating System. Connection to the network can be made via Wi-Fi wireless connection. Supported formats of multimedia files: MP3, WMA, MPEG4, HEVC (H.265), DivX, MKV, JPEG.
The sound system has a capacity of 40 watts (2x10 + 1x20 watts) provided by 3 speakers. 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), HDMI x4, USB x2, Ethernet (RJ-45), Bluetooth, Wi-Fi 802.11ac, WiDi, 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 145 W. Power supply BN44-00878C.
Overall dimensions: with stand 1092x711x300 mm, without stand 1092x635x55 mm.
TV weight: with stand 15kg, without stand 13.1kg.
Warning. The panel CY-SN049HLLV2H of the SAMSUNG UE49NU8070U LED TV is an expensive and unreliable part of it.
Do not allow any impact on the glass and pressure on the surface of the screen to avoid damage to the LED-panel!
Also it is 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.