Technical description and composition of the SAMSUNG UE55JU6400U TV, panel type and modules used. The composition of the modules.SAMSUNG LED
Model: UE55JU6400U
Panel: CY-GJ055HGLVDV
LED backlight: V5DU-550DCA-R1, V5DU-550DCB-R1
T-CON: BN41-02297A BN95-01938A
LED driver (backlight): integrated into PSU
PWM LED driver: SLC3011N
MOSFET LED driver: TO-220F
Power Supply (PSU): BN44-00807A L55S6_FHS
PWM Power: SPC7011F, FA6A20
MOSFET Power: N-FET TO-220F
MainBoard: BN41-02344D BN94-10158V
IC MainBoard: CPU: SDP1406, Spi Flash: 25Q40CLSIP, SOUND: NTP7415, DDR: K4B2G1646Q-BCMA
Tuner: BN40-00318B
Control: Remote: BN59-01198Q, WiFi: WCH730B BN59-01194A, IR: JU7500
UE55JU6400U Specifications
SAMSUNG UE55JU6400U
General recommendations for TV LCD LED repair
Possible manifestations of defects
- TV SAMSUNG UE55JU6400U does not turn on, does not respond to the remote control and control panel buttons, the indicators do not light up or flash.
In some of these cases, a malfunction is detected in the BN44-00807A power supply module. Its output voltages should be measured, and in their absence, check the serviceability of the power switches (N-FET TO-220F) of the converters and rectifier diodes for the probability of short circuit.
In case of breakdowns in the secondary circuits of the converter, it can usually work in an emergency mode in a short circuit mode, and with a short circuit in the power elements of the primary circuit, the mains fuse or current sensor in the source of the key is most often cut off.
Breakdown of power switches (MosFet) in switching sources is sometimes caused by malfunctions of other circuit elements, for example, in the circuits supplying the PWM controller, frequency setting or damper, as well as in the circuits of Negative Feedback (OOS) stabilization. PWM controllers (PWM) SPC7011F, FA6A20, if they do not have visible damage to the case and an open short circuit between the terminals, are usually checked by replacing.
- There is no image, the screen is black, there is sound, sometimes you can see barely noticeable outlines of the image in the ambient light of the screen.
The malfunction in most of such cases is found in the nodes and elements of the LED panel backlight. Often the cause of a malfunction is the lack of current in the LED circuit, for example, their open or short circuit, or a violation of the contact connections of the connectors.
When trying to detect a break in the LED lines, you should take into account that it is difficult to do this without disassembling the panel. For example, a current source is needed to open PN junctions connected in series.
- The indicator blinks or is on constantly, the TV does not turn on, does not respond to the remote control.
Repair or diagnostics of the BN41-02344D motherboard should begin with checking the stabilizers and power converters necessary to power the microcircuits and matrix. If necessary, you should update or replace the software (software). Sometimes it is necessary to check or replace (if necessary) elements of the MainBoard - CPU: SDP1406, Spi Flash: 25Q40CLSIP, SOUND: NTP7415, DDR: K4B2G1646Q-BCMA. In cases where a BGA processor is used, its malfunction is usually detected by a local warm-up method.
If SAMSUNG UE55JU6400U has no picture, but there is sound, often the display backlight CY-GJ055HGLVDV simply does not work. Moreover, in LED TVs, the LEDs inside the panel usually fail, less often the LED driver.
In such cases, you can see a barely noticeable image with a successful hit of external light on the screen.
Replacing the LEDs requires disassembling the LCD panel CY-GJ055HGLVDV - a process that requires experience and qualifications from the master. We do not recommend doing such work on your own to the owners of TVs and craftsmen who do not have experience in repairing LCD panels
If there is no image, and the backlight is on, the screen becomes slightly lighter when turned on, and in an open TV you can see the light through the holes in the panel case.
In this case, the panel may also be faulty - damage to the strips, loops, for example, as a result of moisture ingress after unsuccessful washing of the screen, the T-CON (Timing Controller) board may be faulty. But often the main board MainBoard BN41-02344D also turns out to be faulty, a software failure is also possible.
Then, first of all, you need to check the panel supply voltage, the 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 the normal range, it is necessary to use an oscilloscope to trace the passage of LVDS signals from MainBoard BN41-02344D, as well as synchronizing signals to the loops with drivers.
Flooded or unsuccessfully washed screens of LED TVs can be restored, in about half of the cases, usually if significant damage has not formed in the loops and panel strips.
If the TV operates normally from external devices, but does not tune to TV channels, the BN40-00318B tuner may be faulty. In such cases, first of all, you should make sure that there are supply voltages at its corresponding terminals. It is also necessary to make sure that the tuner and processor can exchange data via the I2C bus. Sometimes the reason for the inoperability of the tuner may be a software failure.
Owners and users of SAMSUNG UE55JU6400U TVs should remember that self-repair without special knowledge, skills and qualifications can be fraught with negative consequences that can lead to complete non-repairability of the device!
Additional MainBoard RepairThe appearance of the MainBoard BN41-02344D is shown in the figure below:
BN41-02344D
External view of the power supply
Main features of the SAMSUNG UE55JU6400U device:
The matrix (LED panel) CY-GJ055HGLVDV is installed.
Matrix control uses the BN41-02297A Timing Controller (T-CON).
A converter combined with a power supply is used to power the backlight LEDs and is controlled by the SLC3011N PWM controller. TO-220F switches are used as power elements of the LED driver.
The formation of the necessary supply voltages for all nodes of the SAMSUNG UE55JU6400U TV is carried out by the BN44-00807A power module, or its analogs using SPC7011F, FA6A20 microcircuits and N-FET TO-220F power switches.
MainBoard - the main board (motherboard) is a BN41-02344D module, using CPU chips: SDP1406, Spi Flash: 25Q40CLSIP, SOUND: NTP7415, DDR: K4B2G1646Q-BCMA and others.
Tuner BN40-00318B provides reception of TV programs and tuning to channels.
TV SAMSUNG UE55JU6400U with LCD CY-GJ055HGLVDV, diagonal size 55 "(140 cm) 16: 9 format. The display technology of this model is implemented with LED backlighting.
The CY-GJ055HGLVDV sensor and MainBoard BN41-02344D software are capable of realizing the highest UHD image quality at 3840x2160 resolution in 4K UHD.
The UE55JU6400U TV is equipped with SMART software, built-in applications and the ability to work on the Internet. The connection to the network can be carried out via Wi-Fi wireless connection. The input analog video signal is decoded in PAL, SECAM, NTSC systems. Graphic processing of a digital signal is carried out in the standards 480i, 480p, 576i, 576p, 720p, 1080i, 1080p, 2160p. Supported media file formats: MP3, WMA, MPEG4, DivX, MKV, JPEG.
Speaker power 20 W (2x10 W) is provided by two speakers. The NICAM STEREO audio processing system is used.
Communication with other devices via an external interface is supported by standard input and output connectors: antenna input (RF), AV, component, HDMI x4, MHL, USB x3, Ethernet (RJ-45), Bluetooth, Wi-Fi 802.11n. 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, 3840x2160.
The digital tuner can receive TV channels in the DVB-T MPEG4, DVB-C, DVB-T2, DVB-S2 standards.
The power consumed when operating from the mains is 202 W. Power supply BN44-00807A.
Dimensions: with stand 1243x763x267 mm, without stand 1243x718x63 mm.
TV weight: with stand: 17.3 kg, without stand: 15 kg.
Attention! Panel CY-GJ055HGLVDV of LED TV SAMSUNG UE55JU6400U is an expensive and unreliable element.
Do not allow any impact on the glass and pressure on the screen surface to avoid damage to the LED panel!
It is also unsafe for liquid to spill onto the screen. Sometimes one drop is enough if it drips down the glass onto the cables to make the TV unrepairable....