Technical description and composition of the SAMSUNG UE43N5570AU TV, panel type and applicable modules. The composition of the modules.SAMSUNG LED
Model: UE43N5570AU
Chassis / Version: AA01
Panel: CY-NN043BGAV1V
LED backlight: BN61-15482A AOT 43 NU7100F 2X28 3030C
LED driver (backlight): integrated into PSU
Power Supply (PSU): BN44-00956A REV1.1 L43E5_NDY
PWM Power: PFC, PWM
MOSFET Power: N-FET TO-220F
MainBoard: BN41-02575A BN94-13052A
IC MainBoard: CPU, eMMC, DRAM, AUDIO, DC / DC
Tuner: BN40-00331B
Technical Specifications UE43N5570AU
SAMSUNG UE43N5570AU
General repair guidelines for TV LCD LED
Possible malfunctions
- The SAMSUNG UE43N5570AU TV does not turn on and does not show any signs of turning on, it does not respond to the control buttons or to the remote control.
In some of these cases, a fault is detected in the BN44-00956A power supply module. In the absence of the necessary supply voltages in the secondary circuits of the converters, it is necessary to check the power switches (N-FET TO-220F) and rectifier diodes for a possible partial or complete breakdown.
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 during 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.
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, PWM, PWM chips are usually checked by replacing with new ones, or obviously working.
- There is no image, there is sound, there is a reaction to the remote control. Or immediately after turning on for a second, the image may appear and immediately disappear.
As a rule, in such cases there is no display backlight. Usually the cause of the malfunction is in the breakage of the LEDs, or in the connectors of the LED strips, but sometimes the LED driver also turns out to be faulty.
To check the health in the LED circuit, it is better to use a current source with a maximum voltage of 200V. We do not recommend using any voltage sources for this purpose. You can test each LED individually with a simple Chinese multimeter (powered by 9 volts) in the P-N-junction test mode. If you connect the red probe of the multimeter to the anode of the LED, and the black to its cathode, then the 3-volt LED will light up slightly, and in the opposite direction you can detect the transition of the emergency zener diode. A zener diode PN junction indirectly indicates a LED-a
- 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 BN41-02575A motherboard should begin by checking the stabilizers and power converters needed to power the chips and matrix. If necessary, you should update or replace the software (software). In cases of attempts to repair the MB (SSB) board, it is necessary to check the health of its elements - CPU, eMMC, DRAM, AUDIO, DC / DC which may require replacement with new ones. If the BGA processor is installed, there is a possibility of a violation of the soldering of the contacts of its conclusions with the board (it is diagnosed by heating).
If there is no reception of television channels, but the TV is working properly from external devices, first of all, check the voltage of the tuner BN40-00331B and update the software. The pulses from the I2C bus must be controlled with an oscilloscope.
It should be remembered! Attempts to self-repair a SAMSUNG UE43N5570AU TV, in the absence of the necessary qualifications and experience, are categorically not recommended and are fraught with negative consequences, up to the complete non-repairability of the device!
The appearance of the MainBoard BN41-02575A is shown in the figure below:BN41-02575A
The appearance of the power supply
Main features of the SAMSUNG UE43N5570AU device:
Installed matrix (LED-panel) CY-NN043BGAV1V.
To power the backlight LEDs, a converter is used, combined with a power supply.
The necessary supply voltages for all nodes of the SAMSUNG UE43N5570AU TV are generated by the BN44-00956A power module or its analogs using PFC, PWM microcircuits, and N-FET TO-220F type power switches.
MainBoard - the main board (motherboard) is a BN41-02575A module, using CPU, eMMC, DRAM, AUDIO, DC / DC, and others.
The tuner BN40-00331B provides the reception of television programs and tuning to channels.