Technical description and composition of the SAMSUNG UE55LS003AU TV, panel type and applicable modules. The composition of the modules.SAMSUNG LED
Model: UE55LS003AU UE55LS003AU
Chassis / Version: BN41-02572A
Panel: CY-KM055FGLV1V
LED backlight: EDGE LED
LED driver (backlight): integrated into PSU
MOSFET LED driver: N-FET TO-220F
Power Supply (PSU): BN44-00923A REV1.1 L55F6N_MDY
PWM Power: PFC, PWM
MOSFET Power: N-FET TO-220F
MainBoard: BN41-02572A BN94-12088A
IC MainBoard: DAC: BURR BROWN 88002, DC / DC: VPM1RT, AUDIO: TAS5747
Tuner: One Connect BN91-19033N SOC1000M
Technical Specifications UE55LS003AU
SAMSUNG UE55LS003AU
General repair guidelines for TV LCD LED
Possible malfunctions
- SAMSUNG UE55LS003AU does not turn on, the indicators on the front panel do not light or flash. The TV does not respond to the control buttons and the remote control.
With such manifestations, the BN44-00923A power supply module usually fails. It is necessary to measure its output voltages and, if they are absent, check the power switches (N-FET TO-220F) and rectifier diodes for the probability of a short circuit in the converters.
In case of any breakdown of semiconductors in the secondary circuits, the converter can usually work normally in emergency short circuit mode. There are no output voltages. And with a short circuit in the power elements of the primary circuit, as a rule, the mains fuse breaks and less often the current sensor at the source of the key.
Breakdown of power switches (MosFet) in pulsed sources is sometimes caused by malfunctions of other circuit elements, for example, in circuits supplying a PWM controller, frequency-setting or damper ones, as well as in negative feedback circuits (OOS) of stabilization. PWM controllers (PWM) PFC, PWM, if they do not have visible damage to the case and open fault between the terminals, are usually checked by replacement.
- There is no image, there is sound, it is responding to the remote control. Or immediately after turning on for a second, the image may appear and immediately disappear.
Usually in such cases, a malfunction is detected in the backlight nodes of the LED panel. 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.
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 blinks or lights constantly, the TV does not turn on, does not respond to the remote control.
Repair or diagnostics of the BN41-02572A 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). Sometimes it is necessary to check or replace (if necessary) the elements of the MainBoard - DAC: BURR BROWN 88002, DC / DC: VPM1RT, AUDIO: TAS5747. In cases where the BGA processor is used, its malfunction is usually detected by the local heating method.
If the TV works normally from external devices, but does not tune into television channels, the One Connect BN91-19033N SOC1000M tuner 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 to users! Self-repair of a SAMSUNG UE55LS003AU TV without the appropriate qualifications and necessary experience can lead to its complete non-repairability!
The appearance of the MainBoard BN41-02572A is shown in the figure below:BN41-02572A
The appearance of the power supply
Main features of the SAMSUNG UE55LS003AU device:
Installed matrix (LED panel) CY-KM055FGLV1V.
To power the backlight LEDs, a converter is used, combined with a power supply. As the power elements of the LED driver, keys of the N-FET TO-220F type are used.
The necessary supply voltages for all nodes of the SAMSUNG UE55LS003AU TV are generated by the BN44-00923A power module or its analogs using PFC, PWM microcircuits, and N-FET TO-220F type power switches.
MainBoard - the main board (motherboard) is a BN41-02572A module, using DAC chips: BURR BROWN 88002, DC / DC: VPM1RT, AUDIO: TAS5747 and others.
The One Connect BN91-19033N SOC1000M tuner provides TV reception and channel tuning.
