Technical description and composition of the SAMSUNG UE50JS7200U TV, panel type and applicable modules. The composition of the modules.SAMSUNG LED
Model: UE50JS7200U UE50JS7200
Chassis / Version: BN41-02344D
Panel: CY-TJ050HGNV2H
LED backlight: V5DR_500SCA_R1 & V5DR_500SCB_R1 (BN96-38480A, BN96-38479A)
T-CON: BN96-34823A 2015_INX_UHD_HAWK_UFT
LED driver (backlight): integrated into PSU
MOSFET LED driver: N-FET TO-220F
Power Supply (PSU): BN44-00859A L55SHN_FHS
PWM Power: PFC, PWM
MOSFET Power: N-FET TO-220F
MainBoard: BN41-02344D BN94-10165T
IC MainBoard: CPU: SDP1406, Spi Flash: 25Q40CLSIP, SOUND: NTP7415, DDR: K4B2G1646Q-BCMA
Tuner: BN40-00318B
Technical Specifications UE50JS7200U
SAMSUNG UE50JS7200U
General repair guidelines for TV LCD LED
Possible malfunctions
- The SAMSUNG UE50JS7200U 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.
In some of these cases, a fault is detected in the BN44-00859A power supply module. 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 the event of breakdowns in the secondary circuits of the converter, it can usually fail in short circuit mode, and in the event of a short circuit in the power elements of the primary circuit, the mains fuse or current sensor at the source of the key most often 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, there is sound, it is responding to the remote control. Or immediately after turning on for a second, the image may appear and immediately disappear.
The most likely in these cases is a malfunction of the LED backlight. Often the cause of the malfunction is the lack of current in the LED circuit, for example, an open or short circuit, or violation of the contact connections of the connectors.
It is impossible to check the line of series-connected LEDs without a special current source, and for this purpose it is not safe to use any voltage sources above 12V for them. Then it remains only to open the panel and check each LED separately. Usually, Chinese 9V-powered multimeters light up a single 3-volt LED, if you connect the probes in the forward direction, the red probe to the anode, and the black to the cathode. In dual 6-volt LEDs, the PN junction of its emergency zener diode can serve as an indicator of health. In the event of a LED malfunction, its zener diode will either be cut off or broken into short-circuit.
- 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 BN41-02344D 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). Sometimes it is necessary to check or replace (if necessary) the elements of the MainBoard - CPU: SDP1406, Spi Flash: 25Q40CLSIP, SOUND: NTP7415, DDR: K4B2G1646Q-BCMA. In cases where the BGA processor is used, its malfunction is usually detected by the local heating method.
In the absence of tuning to the channels of on-air or cable television, you should make sure that the software is correct, as well as in accordance with the ratings of the supply voltage at the terminals of the tuner BN40-00318B. It is also necessary to check the presence of pulses of data exchange between the tuner and the processor via the I2C bus using an oscilloscope.
Attention TV owners! Attempts to self-repair SAMSUNG UE50JS7200U are not recommended by the manufacturer and can lead to serious negative consequences!
The appearance of the MainBoard BN41-02344D is shown in the figure below:BN41-02344D
The appearance of the power supply
Main features of the SAMSUNG UE50JS7200U device:
Installed matrix (LED-panel) CY-TJ050HGNV2H.
The matrix control uses the Timing Controller (T-CON) BN96-34823A.
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 UE50JS7200U TV are generated by the BN44-00859A power supply module or its analogs using PFC, PWM microcircuits, and N-FET TO-220F type power switches.
MainBoard - the main board (motherboard) is a BN41-02344D module, using CPU chips: SDP1406, Spi Flash: 25Q40CLSIP, SOUND: NTP7415, DDR: K4B2G1646Q-BCMA and others.
The tuner BN40-00318B provides the reception of television programs and tuning to channels.
