Technical description and composition of the SAMSUNG UE55NU7300U TV, panel type and applicable modules. The composition of the modules.SAMSUNG LED
Model: UE55NU7300U UE55NU7300
Chassis / Version: FA01
Panel: CY-CN055HGLV2V
LED backlight: AOT 55 NU7300 NU7100 2X40 6V, 80 LED
LED driver (backlight): integrated into PSU
Power Supply (PSU): BN44-00947A L40E6_NDY
PWM Power: PFC, PWM
MOSFET Power: N-FET TO-220F
MainBoard: BN41-02635A BN94-12855E
IC MainBoard: Audio: TAS5745
Tuner: BN40-00330B
Control: Wi-Fi: BN59-01299A (WDN220M)
Technical Specifications UE55NU7300U
SAMSUNG UE55NU7300U
General repair guidelines for TV LCD LED
Possible manifestations of defects
- SAMSUNG UE55NU7300U does not turn on and does not show any signs of performance at all. Does not blink indicators and does not respond to control buttons.
With such manifestations, the BN44-00947A power module usually fails. Then we recommend that you measure its output voltages and, if they are absent, you should check the health of the power switches (N-FET TO-220F) and rectifier diodes of the converters for possible short circuit.
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.
Mos-Fet power switches, used in switching power supplies, sometimes fail due to a malfunction of any other elements that can put it out of operation in key mode, or create an excess of the maximum permissible parameters of the switch. These can be elements supplying the PWM controller, frequency-setting or damping circuits, or negative feedback elements in the stabilization circuit. PFC, PWM PWM controllers, in the absence of visible damage or explicit short-circuit between the terminals, are checked by replacing with new ones, or obviously working.
- There is no image, but there is sound and all other functions work. Sometimes when you turn on the image for a second appears and disappears.
In some of these cases, the malfunction is caused by a lack of backlighting on the display. The reason can sometimes be in the power of the LEDs, but more often in their malfunction (breakdown or break), sometimes in the violation of the contact connections of the LED strips.
It is impossible to check the LED line for breaks without disassembling the panel with a multimeter or tester. For these purposes, it is necessary to open all series-connected PN junctions and a voltage of the order of tens of volts will be required, and ideally, a current source. Having disassembled the panel, it is necessary to check each LED separately. Chinese multimeters, as a rule, light up a single 3-volt LED in the forward direction. In the case of using dual 6-volt LEDs, the PN junction of its protective zener diode can serve as a health indicator. In faulty LEDs, the zener diode will either be cut off or broken into short-circuit.
- The indicator on the front panel blinks, the TV does not turn on in the operating mode, it does not respond to the remote control.
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). Board repair and replacement of Audio: TAS5745 microcircuits are carried out with the necessary equipment, and the corresponding element base. Faults associated with the application of BGA processor soldering technologies can be localized by the heating method.
If the TV works normally from external devices, but does not tune into television channels, the tuner BN40-00330B may be malfunctioning. In such cases, first of all, you should make sure that there are supply voltages at its corresponding conclusions. It is also necessary to make sure that the tuner and processor can exchange data via the I2C bus. Sometimes the cause of the inoperability of the tuner may be a software failure.
Attention! For users and owners of UE55NU7300U 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-serviceability 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 UE55NU7300U device:
Installed matrix (LED-panel) CY-CN055HGLV2V.
To power the backlight LEDs, a converter is used, combined with a power supply.
The necessary supply voltages for all nodes of the SAMSUNG UE55NU7300U TV are generated by the BN44-00947A power supply module or its analogs using PFC, PWM microcircuits and N-FET TO-220F type power switches.
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.
