Technical description and composition of the SAMSUNG UE49MU9000U TV, type of panel and modules used. Module composition.
SAMSUNG LED
Model: UE49MU9000U
Chassis/Version: FA01
Panel: CY-UM049HLLV3V
LED driver (backlight): integrated into MainBoard
PWM LED driver: SOP-20
MOSFET LED driver: TO-252
Power Supply (PSU): BN44-00911A L55E8NR_MSM PSLF191E09A
PWM Power: PFC, PWM
MOSFET Power: N-FET TO-220F
MainBoard: BN41-02570A BN94-11611B
IC MainBoard: CPU, eMMC, DRAM, AUDIO, DC/DC
MainBoard: One connect BN94-11965C
Specifications UE49MU9000U
SAMSUNG UE49MU9000U
General recommendations for LCD LED TV repair
Possible trouble spots
- SAMSUNG UE49MU9000U TV does not turn on, does not respond to the remote and control panel buttons, LEDs are not lit or blinking.
The power module BN44-00911A is often found to be defective in such cases. Then it is necessary to measure its output voltages and in case of their absence check the power switches (N-FET TO-220F) and rectifier diodes of converters for possible short circuits.
If the diodes in the secondary circuits breakdown, the inverter can operate in the emergency short-circuit 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.
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 cause the switch to exceed its maximum allowable parameters. 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, but there is sound and reaction to the remote control. Or the image may appear for a second immediately after switching on.
In these cases it is most probable that the LED panel backlight is defective. The cause may be found in the failure of the LEDs, in violation of the contact connections of the LED strips, or in their power supply (LED-driver).
To check the LED strips for breakage without disassembling the panel a power source, for example, will help. It is not possible to open the series-connected PN-junctions with a simple multimeter, you will need a voltage of about several tens of volts.
- The TV set doesn't turn on or the remote control doesn't respond. Indicator blinks or indicates standby mode.
Repair or diagnostic of the motherboard BN41-02570A should begin with checking the stabilizers and power converters needed to power the microchips and matrix. If necessary, software (software) should be updated or replaced. When repairing the MB board, check its components CPU, eMMC, DRAM, AUDIO, DC/DC. Defective elements should be replaced. If the chips with BGA soldering technology are used, the problem in its implementation is detected by the method of local heating of the chip.
If the SAMSUNG UE49MU9000U has no picture but sound, often the CY-UM049HLLV3V 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.
To replace the LEDs requires disassembly of the LCD panel CY-UM049HLLV3V - 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 BN41-02570A 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, it is necessary to trace by oscilloscope the LVDS signals from MainBoard BN41-02570A, as well as synchronizing signals to the driver stubs.
The LED TV screens that are flooded or poorly washed can be repaired in about half of the cases, usually if there is no significant damage to the cables and panel strips.
If there is no tuning to the on-air or cable TV channels make sure that the software is correct, and also that the supply voltages on the tuner One connect BN94-11965C outputs correspond to the nominal ones. Also check with an oscilloscope if the tuner and the processor are communicating via the I2C bus.
I recommend to UE49MU9000U owners to apply only to the qualified specialists with necessary experience for the repair! The attempts of repair without proper knowledge and skills can lead to irreparable negative consequences!
More on MainBoard Repair
The exterior of the MainBoard BN41-02570A is shown in the illustration below:
BN41-02570A
MainBoard Appearance
The main features of the SAMSUNG UE49MU9000U:
A matrix (LED panel) CY-UM049HLLV3V is installed.
To power the LED backlight using a converter, combined with the main board BN41-02570A, 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 BN44-00911A or its analogues with the use of PFC, PWM chips and N-FET TO-220F type power keys provides the formation of the necessary supply voltages for all the components of SAMSUNG UE49MU9000U TV.
MainBoard - the main board (motherboard) is BN41-02570A module, using CPU, eMMC, DRAM, AUDIO, DC/DC and other chips.
The One connect BN94-11965C tuner provides TV program reception and channel tuning.
Instructions and updates
There are UE49MU9000UXRU downloads available from the manufacturer:
Latest software updates, firmwares (latest firmwares):
File type File name Version Date Size
Update file (USB) T-KTMDEUC.zip 1280.5 14.11.2019 1281.95 Mb
Manual update 2017_TV_Firmware_Upgrade_Instruction_1.0_T-KTMDEUC.pdf 1.0 28.11.2018 0.28 Mb
Update file (USB) T-KTMDEUC_1280.5.exe 1280.5 14.11.2019 1281.65 Mb
Instructions and user manuals (User Manuals):
File Type File Name Version Date Size
UMU9000A_RU_BN68-08440V-01_L04_170628.0.pdf 01 02.08.2017 2.67 Mb
Installation Guide QSG_UMU9000A_CIS_BN68-08455C-01_170719.0.pdf 01 02.08.2017 0.85 Mb
Instruction PDF ENG_KTMDVBEUL-3.0.7_180111.1.pdf 3.0.7 23.01.2018 13.11 Mb
You can download the files from the manufacturer's website for the UE49MU9000UXRU model.
SAMSUNG UE49MU9000U LCD TV CY-UM049HLLV3V, measuring 48.5" (123 cm) diagonally in 16:9 aspect ratio. This model uses a panel with an end arrangement of LEDs in the backlighting of the display - Edge LED.
Matrix CY-UM049HLV3V and MainBoard software BN41-02570A 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 UE49MU9000U 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 capacity of 40 W (2x10 + 2x10 W) is provided by 4 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 input and output connectors: antenna input (RF), HDMI x4, USB x3, 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 170 W. Power supply BN44-00911A.
Overall dimensions: with stand 1092x721x351 mm, without stand 1092x638x94 mm.
TV weight: with stand 17.2 kg, without stand 14.9 kg.
Warning. The panel CY-UM049HLLV3V LED-TV SAMSUNG UE49MU9000U is an expensive and unreliable part of the TV.
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.