Technical description and composition of the SAMSUNG UE50HU7000 TV, panel type and applicable modules. The composition of the modules.SAMSUNG LED
Model: UE50HU7000 UE50HU7000U
Chassis / Version: QS03
Panel: CY-GH050HGNV5V
LED backlight: LM41-00088Y UHD_50_3228
T-CON: V500DK2-CQS1
LED driver (backlight): integrated into PSU
MOSFET LED driver: N-FET TO-220F
Power Supply (PSU): BN44-00755A REV1.3 L55N4_ESM
PWM Power: PFC, PWM
MOSFET Power: N-FET TO-220F
MainBoard: BN41-02206B BN94-08239R
IC MainBoard: CPU, eMMC, DRAM, AUDIO, DC / DC
Tuner: BN40-00294A
Technical Specifications UE50HU7000
SAMSUNG UE50HU7000
General repair guidelines for TV LCD LED
Possible malfunctions
- SAMSUNG UE50HU7000 TV does not turn on. There are no signs of operability. The indicators on the front panel do not light up and do not blink, the TV does not respond to the control buttons.
In such cases, the BN44-00755A power supply is usually faulty. It is necessary to measure its output voltages and, if they are absent, check the power switches (N-FET TO-220F) and rectifier diodes for the probability of a short circuit in the converters.
In case of any breakdown of semiconductors in the secondary circuits, the converter can usually work normally in emergency short circuit mode. There are no output voltages. And with a short circuit in the power elements of the primary circuit, as a rule, the mains fuse breaks and less often the current sensor at the source of the key.
Breakdown of power switches (MosFet) in pulsed sources is sometimes caused by malfunctions of other circuit elements, for example, in circuits supplying a PWM controller, frequency-setting or damper ones, as well as in negative feedback circuits (OOS) of stabilization. PWM controllers (PWM) PFC, PWM, if they do not have visible damage to the case and open fault between the terminals, are usually checked by replacement.
- There is no image, the screen is black, there is sound, with external illumination of the screen, you can sometimes see barely noticeable outlines of the image.
As a rule, in such cases there is no display backlight. The reason can sometimes be in the power of the LEDs, but more often in their malfunction (breakdown or break), sometimes in the violation of the contact connections of the LED strips.
To check the LED strips, to open all the transitions of the LEDs, several tens of volts or more are needed, it is best to use a current source for such purposes. The breakage of several PN junctions connected in series cannot be detected with a multimeter or tester. In such cases, it is necessary to open the panel and check each LED. If your multimeter cannot open the LED transitions in forward bias, sometimes you can detect the presence of a PN junction of the protective zener diode by connecting the probes in the opposite direction. If the zener diode is broken or broken in short-circuit, then the LED is faulty and needs to be replaced.
- 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 BN41-02206B 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.
If the TV works normally from external devices, but does not tune into television channels, the tuner BN40-00294A may be malfunctioning. In such cases, first of all, you should make sure that there are supply voltages at its corresponding conclusions. It is also necessary to make sure that the tuner and processor can exchange data via the I2C bus. Sometimes the cause of the inoperability of the tuner may be a software failure.
Attention! For users and owners of UE50HU7000 TVs who do not have the appropriate qualifications, knowledge and experience, we categorically do not recommend attempting self-repair in order to avoid negative consequences that could lead to complete non-repairability of the device.
The appearance of the MainBoard BN41-02206B is shown in the figure below:BN41-02206B
The appearance of the power supply
Main features of the SAMSUNG UE50HU7000 device:
Installed matrix (LED-panel) CY-GH050HGNV5V.
The matrix control uses the Timing Controller (T-CON) V500DK2-CQS1.
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 formation of the necessary supply voltages for all nodes of the SAMSUNG UE50HU7000 TV is carried out by the BN44-00755A power module, or its analogs using PFC, PWM chips and power switches of the N-FET TO-220F type.
MainBoard - the main board (motherboard) is a BN41-02206B module, using CPU, eMMC, DRAM, AUDIO, DC / DC and other chips.
The tuner BN40-00294A provides the reception of television programs and tuning to channels.
