SAMSUNG LED
Model: UE65MU6400U
Chassis/Version: AC06
Panel: CY-KM065HGAV8V
LED driver (backlight): integrated into MainBoard
PWM LED driver: SO-16
MOSFET LED driver: TO-220F
Power Supply (PSU): BN44-00873B L65E6NR_KSM
PWM Power: PFC, PWM
MOSFET Power: N-FET TO-220F
MainBoard: BN41-02568B BN94-12654J
IC MainBoard: SDP1601, KLM4G1FEPD, 25Q40CLSIP, 25Q80DVSIG, TAS5749M
Specifications: BN40-00331A
Specifications UE65MU6400U
SAMSUNG UE65MU6400U
General recommendations for LCD LED TV repair
Possible problems
- SAMSUNG UE65MU6400U does not turn on, the indicators on the front panel are not lit or blinking. TV does not respond to the control buttons and remote control.
The problem in such cases should be looked for in the circuits of the power supply BN44-00873B. Then you should measure its output voltages, and in case of their full or partial absence you should check the serviceability of the power switches (N-FET TO-220F) and the inverter rectifier diodes for possible short circuits.
If there is a breakdown in the secondary circuits, the inverter can usually be short-circuited, and a short in the power elements of the primary circuit will usually blow the mains fuse.
Mos-Fet switches used in switching power supplies usually fail due to the failure of other elements that 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 pins, are checked by replacing with known good ones.
- No picture, sound is present, all other TV functions work. When switching on, the picture can sometimes appear for a second.
In such cases, it is most likely that the LED panel backlighting is defective. Usually the cause of the malfunction is in the breakage of LEDs, or in the connectors of the LED strips, but sometimes the LED driver is also defective.
Without a special current source to check the line of LEDs in series is impossible, and to use for this purpose, any voltage sources over 12v is not safe for them. Then you only have to open the panel and check each LED separately. Usually Chinese multimeters with 9V power supply will light up one 3 volt LED a bit if you connect the probes to it in forward direction, red probe to anode, black probe to cathode. For twin 6-volt LEDs the PN junction of its faulty regulator can be a good indicator. If the LED is faulty, its regulator will either be open or shorted.
- LED on the front panel is blinking, the TV set does not turn on in the working mode, the remote control is unresponsive.
Repair or diagnostic of the motherboard BN41-02568B should begin with checking the stabilizers and power converters needed to power the chips and matrix. If necessary, update or replace the software (firmware). When repairing MB board, its components SDP1601, KLM4G1FEPD, 25Q40CLSIP, 25Q80DVSIG, TAS5749M should be checked. 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 UE65MU6400U has no picture but has sound, often the CY-KM065HGAV1V 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-KM065HGAV1V - 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 BN41-02568B 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 BN41-02568B, as well as synchronizing signals to the driver stubs.
The screens of LED TVs 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 bars.
Before replacing the BN40-00331A tuner if there is no tuning to the channels it is necessary to check the software and the supply voltage on its pins. Also make sure that the tuner and the processor can communicate via the I2C bus.
Once again I remind the TV users: do not try to repair the TV without proper knowledge, experience and necessary qualification! Entrust the repair to professionals with sufficient experience in the field of repair of electronic equipment.
More on MainBoard Repair
The MainBoard BN41-02568B is shown in the figure UP HERE:
BN41-02568B
MainBoard Appearance
The main features of the SAMSUNG UE65MU6400U:
A matrix (LED panel) CY-KM065HGAV8V is installed.
To power the LED backlight using a converter, combined with the main board BN41-02568B, controlled by a PWM controller SO-16. As the power elements of the LED-driver are used TO-220F-type switches.
The power supply module BN44-00873B or its analogues with the use of PFC, PWM and N-FET TO-220F type power keys form the necessary supply voltages for all the components of SAMSUNG UE65MU6400U TV.
MainBoard - the main board (motherboard) is a module BN41-02568B, using SDP1601, KLM4G1FEPD, 25Q40CLSIP, 25Q80DVSIG, TAS5749M and others.
The BN40-00331A tuner provides TV program reception and channel tuning.
Instructions and updates
There are download files for UE65MU6400UXXU 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
UMU6400Q_RU_BN68-08444G-01_L04_170327.1.pdf 01 14.04.2017 19.96 Mb
Installation Guide QSG_UMU6400Q_CIS_BN68-08410R-00_170307.1.pdf 00 14.04.2017 1.28 Mb
Instruction PDF ENG_KTMDVBEUL-3.0.7_180111.1.pdf 3.0.7 23.01.2018 13.11 Mb
The files can be downloaded from the manufacturer's website for the model UE65MU6400UXXU
SAMSUNG UE65MU6400U LCD TV CY-KM065HGAV1V, measuring 65" (165 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-KM065HGAV1V and MainBoard software BN41-02568B 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 model of TV UE65MU6400U has built-in software (software) SMART and installed the operating system Tizen. Connection to the network can be made via wireless Wi-Fi. Input analog video signal is decoded in PAL, SECAM, NTSC systems. Graphic processing of a digital signal is done in 480i, 480p, 576p, 720p, 1080i, 1080p. Supported media file formats: MP3, WMA, MPEG4, HEVC (H.265), DivX, MKV, JPEG.
The sound system capacity of 20 W (2x10 W) is provided by 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 standard input and output connectors: Antenna input (RF), AV, component, HDMI x3, USB x2, Ethernet (RJ-45), Bluetooth, Wi-Fi 802.11n, Miracast. A VGA (D-Sub 15) connector is provided to connect a computer or laptop to this TV model. This interface supports standard resolutions: 640x480, 800x600, 1024x768, 1280x1024, 1360x768, 1920x1080. The digital tuner is capable of receiving DVB-T, DVB-T2, DVB-C, DVB-S, DVB-S2 TV channels.
The power consumed by the worker in mains mode is 185 W. Power supply BN44-00873B.
Overall dimensions: with stand 1456x920x382 mm, without stand 1456x840x55 mm.
TV weight: with stand 26.7 kg, without stand 23.2 kg.
Warning. The panel CY-KM065HGAV1V of SAMSUNG UE65MU6400U 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!
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.