Technical description and composition of the SAMSUNG UE55KS7000U TV, panel type and applicable modules. The composition of the modules.SAMSUNG LED
Model: UE55KS7000U
Panel: CY-QK055FLAV2V
LED driver (backlight): integrated into PSU
Power Supply (PSU): BN44-00878A L55E7_KSM PSLF191E08A
MainBoard: BN41-02504A BN94-10961L
IC MainBoard: CPU, eMMC, DRAM, AUDIO, DC / DC
Tuner: One Connect
Technical Specifications UE55KS7000U
SAMSUNG UE55KS7000U
General repair guidelines for TV LCD LED
Possible malfunctions
- The SAMSUNG UE55KS7000U TV does not turn on and does not show any signs of turning on, it does not respond to the control buttons or the remote control.
Often in such cases, the BN44-00878A power module is faulty. It is necessary to measure its output voltages, and in case of their absence (full or partial), it is necessary to check the serviceability of the power switches of the converters and rectifier diodes for the presence of a possible 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 main 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. 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 and all other functions work. Sometimes when you turn on the image for a second appears and disappears.
In some of these cases, the malfunction is caused by a lack of backlighting on the display. Often the cause of the malfunction is the lack of current in the LED circuit, for example, an open or short circuit, or a violation of the contact connections of the connectors.
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 on the front panel blinks, the TV does not turn on in the operating mode, it does not respond to the remote control.
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). If it is not possible to replace the MB (SSB) card, you need to check the health of its elements - CPU, eMMC, DRAM, AUDIO, DC / DC. Defective components should be replaced.
Before changing the One Connect tuner, if it is not possible to tune to television channels, make sure that there are supply voltages, which must be measured at the corresponding tuner terminals and checked for correctness. The pulses of the data exchange of the tuner with the processor can be controlled by an oscilloscope
Once again, we remind TV users: you should not make attempts to repair it yourself without the appropriate knowledge, experience and the necessary qualifications! Entrust repair to professionals with sufficient experience in the field of repair of electronic equipment.
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 UE55KS7000U device:
Installed matrix (LED panel) CY-QK055FLAV2V.
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 UE55KS7000U TV is carried out by the power module BN44-00878A, or its analogs.
MainBoard - the main board (motherboard) is a BN41-02504A module, using CPU, eMMC, DRAM, AUDIO, DC / DC and other chips.
The One Connect tuner provides television reception and channel tuning.
