Technical description and composition of the SAMSUNG UE49KS7500U TV, panel type and applicable modules. The composition of the modules.SAMSUNG LED
Model: UE49KS7500U
Chassis / Version: BN41-02504A
Panel: CY-XK049FLGV3V
LED driver (backlight): integrated into PSU
Power Supply (PSU): BN44-00878A PSLF191E08A L55E7_KSM
MainBoard: BN41-02504A BN94-10758G
IC MainBoard: CPU, eMMC, DRAM, AUDIO, DC / DC
Tuner: One connect BN91-18201B BN94-10924E
Control: WIFI: WCK730B BN59-01239A,
Technical Specifications UE49KS7500U
SAMSUNG UE49KS7500U
General repair guidelines for TV LCD LED
Possible manifestations of defects
- The SAMSUNG UE49KS7500U TV does not turn on and does not show any signs of operability at all. There is no reaction to the remote control and control buttons from the front panel.
Usually with such manifestations, the defect is caused by faulty elements in the main power module BN44-00878A. It is necessary to measure the output voltages in its secondary circuits, and if they are completely absent, it is necessary to check the serviceability of power switches and rectifier diodes for possible breakdown (short circuit).
In case of breakdowns in the secondary circuits, the converter, as a rule, can emergency work in the short circuit mode, and during short circuit in the power elements of the primary circuit, the mains fuse usually breaks.
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 microcircuits are usually checked by replacement 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
Usually in such cases there is no backlight LED-panel (matrix). The reason may be a break in the LEDs, in the stabilization of their power supply, or in the violation of the contact connections of the strings
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 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 BN41-02504A 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). In cases of complex repairs of MB (SSB) and with the necessary skills and equipment, sometimes it may be necessary to replace its chips with CPU, eMMC, DRAM, AUDIO, DC / DC and other possible malfunctioning components. Malfunctions associated with the application of BGA soldering technologies are usually easily diagnosed by the heating method.
Before changing the tuner One connect BN91-18201B BN94-10924E, if it is not possible to tune to television channels, make sure that there are supply voltages that must be measured at the corresponding terminals of the tuner and check the software for correctness. The pulses of the data exchange of the tuner with the processor can be controlled by an oscilloscope
It should be remembered! Attempts to self-repair a SAMSUNG UE49KS7500U 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 BN41-02504A is shown in the figure below:BN41-02504A
The appearance of the power supply
Main features of the SAMSUNG UE49KS7500U device:
Installed matrix (LED panel) CY-XK049FLGV3V.
To power the backlight LEDs, a converter is used, combined with a power supply.
The formation of the necessary supply voltages for all nodes of the SAMSUNG UE49KS7500U TV is carried out by the power module BN44-00878A, or its analogues.
MainBoard - the main board (motherboard) is a BN41-02504A module, using CPU, eMMC, DRAM, AUDIO, DC / DC, and others.
The tuner One connect BN91-18201B BN94-10924E provides the reception of television programs and tuning to channels.
