Technical description and composition of the SAMSUNG UE48JS8500T TV, panel type and applicable modules. The composition of the modules.SAMSUNG LED
Model: UE48JS8500T UE48JS8500
Chassis / Version: BN41-02356B
Panel: CY-XJ048FLLV4V
LED backlight: Curved TV Backlight Strips
T-CON: BN41-02297A LSF480FJ03-K BN95-02330A
LED driver (backlight): integrated into PSU
MOSFET LED driver: N-FET TO-220F
Power Supply (PSU): BN44-00833A L48E8_FHZ
PWM Power: PFC, PWM
MOSFET Power: N-FET TO-220F
MainBoard: BN41-02356B BN94-07833J
IC MainBoard: Hynix H26M41103HPR, K4B2G1646Q
Tuner: BN40-00309B
Technical Specifications UE48JS8500T
SAMSUNG UE48JS8500T
General repair guidelines for TV LCD LED
Possible manifestations of defects
- SAMSUNG UE48JS8500T does not turn on, does not respond to buttons and remote control, indicators on the front panel do not light up and do not blink.
Most likely in this case, the main switching power supply (IIP) BN44-00833A is faulty. It is necessary to measure the output voltages in its secondary circuits, and if they are completely absent, check the serviceability of power switches (N-FET TO-220F) and rectifier diodes for possible breakdown (short circuit).
In case of breakdowns of semiconductors in the secondary circuits of any converter, as a rule, it can operate in emergency short circuit mode without output voltages, and during short circuit in the elements of the primary circuit, the mains fuse and, less often, the current sensor at the source of the key are most often cut off.
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, it reacts to the remote control. Or the image appears when you turn it on and immediately disappears
As a rule, in this case, the LED backlight turns out to be faulty. More often the reason for this is the breakdown of the LEDs, or poor contact in the connectors of the strips, less often the LED driver may be 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 enter the operating mode, does not respond to the remote control. The indicator on the front panel lights constantly or blinks.
Repair or diagnostics of the BN41-02356B 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 Hynix H26M41103HPR, K4B2G1646Q elements. BGA chip malfunctions are usually easy to detect by warming up.
If a tuner BN40-00309B 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 on the corresponding tuner pins.
We recommend the owners of the UE48JS8500T TV for repair only to qualified specialists with the necessary work experience! Self-repair attempts without the appropriate knowledge and skills can lead to irreversible negative consequences!
The appearance of the MainBoard BN41-02356B is shown in the figure below:BN41-02356B
The appearance of the power supply
Main features of the SAMSUNG UE48JS8500T device:
Installed matrix (LED panel) CY-XJ048FLLV4V.
The matrix control uses the Timing Controller (T-CON) BN41-02297A.
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 UE48JS8500T TV are generated by the BN44-00833A power module or its analogs using PFC, PWM microcircuits, and N-FET TO-220F type power switches.
MainBoard - the main board (motherboard) is a BN41-02356B module, using Hynix H26M41103HPR, K4B2G1646Q and other chips.
The tuner BN40-00309B provides the reception of television programs and tuning to channels.
