Technical description and composition of SAMSUNG UE49KU6500 TV, type of panel and modules used. Module composition.
SAMSUNG LED
Model: UE49KU6500 UE49KU6500U
Chassis/Version: FA01
Panel: CY-VK049HGLV4V // CY-VK049HGLV6V
LED backlight: LM41-00246A
LED driver (backlight): integrated into PSU
PWM LED driver: SM1251
MOSFET LED driver: N-FET TO-220F
Power Supply (PSU): BN44-00876A L55E6_KHS
PWM Power: PFC, PWM
MOSFET Power: N-FET TO-220F
MainBoard: BN41-02528A BN94-10784A
IC MainBoard: SDP1531, K4F8E304HBMGCH, 25Q80DVSIG, 25Q40CLSIP, S24C512C
Specifications: BN40-00323A
Specifications UE49KU6500U
SAMSUNG UE49KU6500
General recommendations for LCD LED TV repair
Possible defects
- SAMSUNG UE49KU6500 TV does not turn on, does not respond to the remote and the control panel buttons, LEDs are not lit or blinking.
Most often with such manifestations turns out to be a faulty main power module BN44-00876A. It is necessary to measure the output voltages in its secondary circuits, and in case of their complete absence you should check the serviceability of the power switches (N-FET TO-220F) and the rectifier diodes for possible breakdown (short circuit).
With any breakdown in the secondary circuits, the inverter can operate in an emergency short-circuit mode, and a short in the power elements of the primary circuit is more likely to blow the mains fuse or the current sensor at the source of the key.
Breakdown of power switches (MosFet) in pulse sources, sometimes caused by failures of other circuit elements, for example, in the circuits that feed the PWM controller, frequency-retaining or damping circuits, as well as in the negative feedback (negative feedback) stabilization circuits. PWM regulators (PFC) PFC, PWM, if they do not have visible case damage and outright short circuit between pins, are usually checked by replacement.
- No picture, but there is sound and all other functions work. Sometimes when switching on the image appears for a second and then disappears.
The most probable in these cases is the failure of the LED panel backlight. The cause may be in the breakage of backlight LED's, in their power supply stabilization, or in the violation of the contact connections of LM41-00246A string connectors.
It should be remembered that to determine the breakage in the LED strings without disassembling the panel, with a tester or multimeter is not possible without an additional device, such as a current source. To open all the PN-junctions connected in series at once you may need a voltage of several tens of volts. Then you have to open the panel and check each LED separately with a multimeter. If the capabilities of your multimeter do not allow to open the LED in the forward direction or twin LEd's are used, then the PN junction of the faulty stabilizer can indirectly serve as an indication of serviceability. If the LED is faulty, the PN junction of the stabilizer will either be open or short-circuited.
- The TV set does not enter the operation mode, the remote control is not responding. Front panel LED is either on continuously or is blinking.
Repair or diagnostic of main board BN41-02528A should be started with checking stabilizers and power converters necessary to power the microcircuits and matrix. If necessary, software (software) should be updated or replaced. In some cases to repair MB board (SSB) you may need to replace the chips - SDP1531, K4F8E304HBMGCH, 25Q80DVSIG, 25Q40CLSIP, S24C512C with new or known good ones. In cases of BGA technology, defects are usually localized by heating.
If you have no TV channel reception, but your TV set is working properly from external devices, the first thing to do is to check the BN40-00323A tuner power supply voltage and update the software. It is necessary to check the I2C communication pulses with an oscilloscope.
If the SAMSUNG UE49KU6500U has no picture but there is sound, often the CY-VK049HGLV4V 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 a faintly visible image when external light hits the screen.
To replace the LEDs requires disassembly of the LCD panel CY-VK049HGLV4V - 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 BN41-02528A 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 the LVDS signals from MainBoard BN41-02528A, as well as synchronizing signals to the driver stubs with oscilloscope.
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.
I would like to remind the users once again! The attempts to repair the SAMSUNG UE49KU6500 TV without the appropriate qualification and experience can lead to its complete unrepairability!
Repair of backlight after repair. BN44-00876A, SM1251. Information from the master.
Decrease backlight current from 530 mA to 430 mA - added another 10k resistor R9137 in parallel, and adjusted current with trimmer R9140 in power supply unit BN44-00876A.
Limiting the driver current. BN44-00876A. General recommendations.
To reduce the backlight current in the BN44-00876A block with the SM1251, you must first extend the current adjustment range of the trimmer resistor by changing the ratings in the divider. To do this, you can halve the R9137 resistor rating on the BN44-00876A power supply board.
The second option is to increase proportionally the rating of the resistor (current sensor) R9165 at the source of the converter's power switch.
The appearance of the MainBoard BN41-02528A is shown in the figure below:
BN41-02528A
The BN41-02528A can be used in televisions:
SAMSUNG UE43KU6650U (Panel CY-VK043HGAV5V), SAMSUNG UE43KU6000W UE43KU6000 (Panel CY-GK043HGEV1H), SAMSUNG UE55KU6400 UE55KU6400U (Panel CY-KK055HQLV4H), SAMSUNG UE49KU6670 UE49KU6670U (Panel CY-VK049HGLV4V), SAMSUNG UE40KU6000U (Panel LSF400FN05-L03 CY-GK040HGLV4V), SAMSUNG UE40KU6300U (Panel CY-WK040HGLV1V), SAMSUNG UE43KU6500U (Panel CY-VK043HGAV4V T430QVR01.0), SAMSUNG UE40KU6402U (Panel CY-KK040HGNV4H).
Appearance of the power supply
The main features of the SAMSUNG UE49KU6500:
A matrix (LED panel) CY-VK049HGLV4V or CY-VK049HGLV6V is installed.
To power the LED backlight used converter, combined with a power supply, controlled by a PWM controller SM1251. N-FET TO-220F switches are used as power elements of LED-driver.
The power supply module BN44-00876A or its analogues with the use of PFC, PWM and N-FET TO-220F power switches perform the formation of the necessary supply voltages for all the components of SAMSUNG UE49KU6500.
MainBoard - the main board (motherboard) is a module BN41-02528A, using SDP1531, K4F8E304HBMGCH, 25Q80DVSIG, 25Q40CLSIP, S24C512C and others.
The BN40-00323A tuner allows you to receive TV programs and tune to channels.
Instructions and updates
There are UE49KU6500UXZG downloads available from the manufacturer for the model UE49KU6500UXZG:
Latest software updates, firmwares (latest firmwares):
File type File name Version Date Size
Update instructions 2016_TV_Firmware_Upgrade_Instruction_1.0_T-JZMDEUC.pdf 1.0 27.11.2018 0.35 Mb
Update file (USB) T-JZMDEUC.zip 1242.0 18.02.2020 1285.72 Mb
Update file (USB) T-JZMDEUC_1242.0.exe 1242.0 18.02.2020 1285.43 Mb
User Manuals (User Manuals):
File Type File Name Version Date Size
Instruction PDF ENG-JZDVBEUK-1.1.3.pdf 1.1.3 09.12.2016 27.45 Mb
The files can be downloaded from the manufacturer's website for the model UE49KU6500UXZG
SAMSUNG UE49KU6500U LCD TV CY-VK049HGLV4V, size diagonal 49" (124 cm) in 16:9 aspect ratio. In the manufacturing technology of the display of this model is implemented LED backlighting.
Matrix CY-VK049HGLV4V and MainBoard software BN41-02528A 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.
UE49KU6500U TV is equipped with SMART software, built-in applications and the ability to work on the Internet. Connection to the network can be made through Wi-Fi wireless connection. Supported multimedia file formats are MP3, WMA, MPEG4, MKV, JPEG.
The capacity of the sound system is 20 watts (2x10 watts) provides two speakers. NICAM stereo sound processing system and Sound Surround surround function are used.
Communication with other devices via an external interface is supported by the standard input and output connectors: antenna input (RF), AV, component, HDMI x3, USB x2, Ethernet (RJ-45), Bluetooth, Wi-Fi. The digital tuner is capable of receiving DVB-T, DVB-T2, DVB-C, DVB-S2 TV channels.
The power supply BN44-00876A is used.
Overall dimensions: with stand 1096x698x296 mm, without stand 1096x639x104 mm.
TV weight: with stand 16.5 kg, without stand 13.9 kg.
Warning. The CY-VK049HGLV4V LED TV panel is an expensive and unreliable part of the SAMSUNG UE49KU6500U TV.
Do not allow any impact on the glass and pressure on the surface of the screen to avoid damage to 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.