Technical description and composition of the SAMSUNG UE49NU7170 TV, panel type and applicable modules. The composition of the modules.SAMSUNG LED
Model: UE49NU7170 UE49NU7170U
Chassis / Version: FA01
Panel: CY-NN049HGLV2V
LED backlight: BN61-15483A AOT_49_NU7300 NU7100 2X38_3030C d6t-2d1_19S2
LED driver (backlight): integrated into PSU
Power Supply (PSU): BN44-00932B L55E6_NSM PSLF171301A BN94-00932B
MainBoard: BN41-02635A BN94-12798E
IC MainBoard: Audio: TAS5745
Tuner: BN40-00330B
Control: IR: Y18 VNB V0.7 (CT171124) 45912A
Technical Specifications UE49NU7170U
SAMSUNG UE49NU7170
General repair guidelines for TV LCD LED
Possible malfunctions
- SAMSUNG UE49NU7170 TV does not turn on, does not respond to the remote control and control panel buttons, indicators do not light up and do not blink.
With such manifestations, the BN44-00932B power module usually fails. It is necessary to measure its output voltages and, in case of their absence, check the serviceability of power switches and rectifier diodes in the converters for possible breakdown.
In case of breakdowns of semiconductors in the secondary circuits, the converter can usually work abnormally in the short circuit mode, and during short circuit in the power elements of the primary circuit, the mains fuse often breaks.
The breakdown of Mos-Fet keys used in pulsed sources is often caused by malfunctions of other elements, for example, in the power supply circuit of a PWM controller, in frequency-setting or damping circuits, as well as in Negative Stabilization Feedback. PWM microcircuits are usually checked by replacement with new ones, or obviously working.
- There is no image, but there is sound and all the other functions of the TV work. The image sometimes for a second appears immediately after turning on and disappears.
A malfunction is usually most likely in these cases at the backlight nodes of the display matrix. Often the cause is a malfunction of the LEDs (open circuit, short circuit ...), or the connectors of the strips (strings), less often the LED driver is malfunctioning.
To check the LED lines for breaks without disassembling the panel, for example, a current source will help. It is impossible to open series-connected PN junctions with a simple multimeter, a voltage of the order of several tens of volts is required.
- The TV does not turn on, does not respond to the remote control. The indicator blinks or signals standby mode.
Repair or diagnostics of the BN41-02635A motherboard should begin by checking the stabilizers and power converters needed to power the chips and matrix. If necessary, update or replace the software (software). Sophisticated MB board repair (SSB) is in some cases possible and practiced by repairmen. To do this, check and, if necessary, replace the Audio: TAS5745 elements. BGA chip malfunctions are usually easy to detect by warming up.
If a tuner BN40-00330B is suspected of malfunction, first of all, it is necessary to verify the correctness of the software, as well as the presence of the necessary supply voltage levels and data exchange pulses with the processor via the I2C bus at the corresponding tuner pins.
Attention! For users and owners of UE49NU7170 TVs who do not have the appropriate qualifications, knowledge and experience, we categorically do not recommend attempting self-repair in order to avoid negative consequences that could lead to complete non-repairability of the device.
The appearance of the MainBoard BN41-02635A is shown in the figure below:BN41-02635A
The appearance of the power supply
Main features of the SAMSUNG UE49NU7170 device:
Installed matrix (LED panel) CY-NN049HGLV2V.
To power the backlight LEDs, a converter is used, combined with a power supply.
The formation of the necessary supply voltages for all nodes of the SAMSUNG UE49NU7170 TV is carried out by the BN44-00932B power module, or its analogues.
MainBoard - the main board (motherboard) is a BN41-02635A module, using Audio chips: TAS5745 and others.
The tuner BN40-00330B provides the reception of television programs and tuning to channels.
