SAMSUNG LED
Model: UE43J5272AU
Chassis / Version: BN41-02482A
Panel: BOEI430WU1 // HV430FHB-N1A
LED backlight: GC43DO8-ZC22AG-17F
LED driver (backlight): integrated into PSU
PWM LED driver: SLC7015R
Power Supply (PSU): BN44-00852A
PWM Power: FA6A20N
MainBoard: BN41-02482A BN94-09586L
IC MainBoard: CPU, eMMC, SPI Flash, DRAM, AUDIO, DC / DC
Tuner: BN40-00318A DNTS243H5A
Specifications UE43J5272AU
SAMSUNG UE43J5272AU
General recommendations for TV LCD LED repair
Possible malfunctions
- SAMSUNG UE43J5272AU does not turn on, indicators on the front panel do not light or flash. The TV does not respond to the control buttons and the remote control.
With similar manifestations, in some cases, the power module BN44-00852A turns out to be faulty. Then you should measure its output voltages and, in case of their complete or partial absence, it is necessary to check the serviceability of the power switches and rectifier diodes of the converters for a possible 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 Mos-Fet switches used in switching power supplies is often caused by malfunctions of other elements, for example, in the power supply circuit of a PWM controller, in frequency setting or damper circuits, as well as in negative feedback stabilization. PWM microcircuits (PWM) FA6A20N are usually checked by replacing them with new ones, or known to be working properly.
- There is no picture, but there is sound and all other TV functions are working. The image sometimes appears for a second immediately after switching on and disappears.
A malfunction is usually in these cases most likely in the backlight units of the display matrix. Often the cause of the 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 of the GC43DO8-ZC22AG-17F strips.
It is impossible to check the line of series-connected LEDs without a special current source, and it is unsafe for them to use any voltage sources above 12V for this purpose. Then all that remains is to open the panel and check each LED separately. Usually, Chinese multimeters with 9V power supply lightly light one 3-volt LED, if you connect the probes to it in the forward direction, the red probe to the anode, the black one to the cathode. For dual 6-volt LEDs, the PN junction of its emergency zener diode can serve as an indicator of the LED health. In the event of a malfunction of the LED, its zener diode will either be cut off, or broken through in the K / Z.
- 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 BN41-02482A 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). Complex repair of MB (SSB) is possible only in a service center with the necessary equipment. Checking or replacing elements of CPU, eMMC, SPI Flash, DRAM, AUDIO, DC / DC requires the necessary training and professional skills in repairing modules at the component level. Problems associated with the use of BGA soldering technologies can sometimes be diagnosed by the warm-up method.
Before changing the BN40-00318A DNTS243H5A tuner, if it is not possible to tune to TV channels, you should make sure that there are supply voltages, which must be measured at the corresponding tuner terminals and check the software for correctness. The pulses of data exchange between the tuner and the processor can be monitored with an oscilloscope.
Attention! Users and owners of UE43J5272AU TVs who do not have the appropriate qualifications, knowledge and experience are strongly discouraged from trying to repair themselves in order to avoid negative consequences that can lead to the complete non-repairability of the device.
INFPORMATIONS FOR Improvement of the driver. SLC7015R.
To reduce the backlight current, I soldered another 5.6 kOhm to pin 3 of the ADIM of the SLC7015R microcircuit in parallel with the resistors R9834 and R9833. That is, it reduced the total resistance in the lower arm of the divider at the input, therefore the voltage at the ADIM input decreased, and the backlight current decreased proportionally from 720 mA to 540 mA.
Driver current limitation. SLC7015R. General recommendations
To reduce the backlight current in buck drivers with an SLC7015R controller, you can proportionally increase the resistance of the low-resistance measuring resistor - the current sensor at the source of the forward converter switch.
Alternatively, the second option is to reduce the voltage at pin 3 of the ADIM SLC7015R using a divider.
DOWNLOAD DATASHEET INFORMATION ------------------> SLC7015
The appearance of the MainBoard BN41-02482A is shown in the figure below:
BN41-02482A
External view of the power supply
Main features of the SAMSUNG UE43J5272AU device:
Installed matrix (LED panel) BOEI430WU1 or HV430FHB-N1A.
A converter combined with a power supply is used to power the backlight LEDs and is controlled by the SLC7015R PWM controller.
The formation of the necessary supply voltages for all nodes of the SAMSUNG UE43J5272AU TV is carried out by the BN44-00852A power module, or its analogs using FA6A20N microcircuits.
MainBoard - the main board (motherboard) is a BN41-02482A module, using CPU, eMMC, SPI Flash, DRAM, AUDIO, DC / DC and others.
Tuner BN40-00318A DNTS243H5A provides reception of television programs and tuning to channels.
SAMSUNG UE43J5272AU TV with LCD HV430FHB-N1A, 42.5 "(108 cm) diagonal 16: 9 format. The display technology of this model implements LED backlighting.
The HV430FHB-N1A sensor and MainBoard BN41-02482A software allow viewing of broadcasts and movies in high quality HD at a resolution of 1920x1080 pixels in graphics resolution at 1080p (Full HD).
The UE43J5272AU 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. Supported media file formats: MP3, MPEG4, HEVC (H.265), MKV, JPEG.
Speaker sound system power 20 W (2x10 W) is provided by two speakers. The NICAM stereo audio processing system and the Sound Surround function are used.
Communication with other devices via an external interface is supported by standard input and output connectors: antenna input (RF), AV, component, HDMI x2, USB, Ethernet (RJ-45), Wi-Fi, Miracast. The digital tuner is capable of receiving television channels in the DVB-T, DVB-T2, DVB-C, DVB-S, DVB-S2 standards.
The power consumed when operating from the network is 84 W. Power supply BN44-00852A.
Dimensions: with stand 967x620x227 mm, without stand 967x572x80 mm.
TV weight: with stand: 7.4 kg, without stand: 7.3 kg.
Attention! Panel HV430FHB-N1A LED TV SAMSUNG UE43J5272AU is an expensive and unreliable element.
Avoid any impacts 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.
The LED screen of the SAMSUNG UE43J5272AU TV requires respect for itself. The glass can crack even when lightly hit by a child's toy.
Excessive pressure on the screen surface over any part of the area is no less dangerous.
If the screen is damaged, it will be necessary to replace the LED panel HV430FHB-N1A.