Technical description and composition of the SAMSUNG UE49M5500AU TV, panel type and applicable modules. The composition of the modules.SAMSUNG LED
Model: UE49M5500AU UE49M5500
Chassis / Version: KANT_S (SIDE)
Panel: CY-KK049BGHV9V
LED backlight: Edge LED
LED driver (backlight): integrated into PSU
Power Supply (PSU): BN44-00872D L55E1K_KSM
MainBoard: BN41-02575B
IC MainBoard: CPU: SDP1604
Tuner: BN40-00331B
Technical Specifications UE49M5500AU
SAMSUNG UE49M5500AU
General repair guidelines for TV LCD LED
Possible malfunctions
- The SAMSUNG UE49M5500AU TV does not turn on and does not show any signs of turning on, does not respond to the control buttons or to the remote control.
With similar manifestations, in some cases, the BN44-00872D power module is faulty. It is necessary to measure its output supply voltages, and in case of their absence, check the serviceability of the power switches of the converters and rectifier diodes for the probability of breakdown in PN semiconductor junctions.
In case of breakdowns of semiconductors in secondary circuits, the converter can usually work abnormally in the short circuit mode, and during short circuit in the power elements of the primary circuit, the mains fuse 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, 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 this case, the LED backlight turns out to be faulty. 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.
It is impossible to detect a break in the LED line without disassembling the panel with a simple multimeter. The LEDs are connected in series and to open their transitions, a voltage of several tens of volts is required. Ideally, a current source is suitable for such purposes. You can open the panel and check each LED separately. Typically, Chinese multimeters light up a single 3-volt LED, if you connect the probes in the forward direction to it (red probe to the anode, 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 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 BN41-02575B 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). Often, the MB (SSB) card must be replaced in case of complex malfunctions that are difficult to detect. When trying to repair, you should check its elements - CPU: SDP1604 and replace failed chips with new ones. Some malfunctions may be due to the use of BGA soldering technologies in modern Main Board technologies. Typically, such defects are detected by local heating of the chip.
If a tuner BN40-00331B 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 at the corresponding tuner pins.
Attention to users! Self-repair of a SAMSUNG UE49M5500AU TV without the appropriate qualifications and necessary experience can lead to its complete non-repairability!
The appearance of the MainBoard BN41-02575B is shown in the figure below:BN41-02575B
The appearance of the power supply
Main features of the SAMSUNG UE49M5500AU device:
Installed matrix (LED-panel) CY-KK049BGHV9V.
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 UE49M5500AU TV is carried out by the BN44-00872D power module, or its analogues.
MainBoard - the main board (motherboard) is a BN41-02575B module, using CPU chips: SDP1604 and others.
The tuner BN40-00331B provides the reception of television programs and tuning to channels.
