Technical description and composition of the SAMSUNG UE55M6550AU TV, panel type and applicable modules. The composition of the modules.SAMSUNG LED
Model: UE55M6550AU UE55M6550
Chassis / Version: BN41-02575B
Panel: CY-VK055BGHV5V
LED backlight: EDGE LED 7030
T-CON: TT5461B07-1-C-3
LED driver (backlight): integrated into MainBoard
MOSFET LED driver: TO-252
Power Supply (PSU): BN44-00872D L55E1K_KSM
PWM Power: PFC, PWM
MOSFET Power: N-FET TO-220F, TO-252
MainBoard: BN41-02575B BN94-10502M
IC MainBoard: CPU: SDP1604
Tuner: BN40-00331B
Technical Specifications UE55M6550AU
SAMSUNG UE55M6550AU
General repair guidelines for TV LCD LED
Possible malfunctions
- The SAMSUNG UE55M6550AU 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.
Most often, with such manifestations, the main power module BN44-00872D is found to be faulty. It is necessary then to measure its output voltages and, if they are absent, you should check the power switches (N-FET TO-220F, TO-252) and rectifier diodes of the converters for a short circuit probability.
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.
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, there is sound, it responds to the remote control. Or the image may appear for a second when turned on and immediately disappears.
The most likely in these cases is a malfunction of the LED backlight. More often the reason for this is the breakdown of the LEDs, or poor contact in the connectors of the strips, less often the LED driver may be malfunctioning.
When diagnosing, it is necessary to take into account that it is impossible to check the open in the chain of LED lines without disassembling the panels using a tester or multimeter. To open all PN junctions connected in series, a voltage of the order of several tens of volts is required, and ideally, a current source. By opening the panel, each LED can be checked separately. Typically, Chinese multimeters light up a single 3-volt LED, if you connect probes in the forward direction to it. 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). In cases of complex repairs of MB (SSB) and in the presence of the necessary skills and equipment, sometimes it may be necessary to replace its CPU chips: SDP1604 and other possible faulty components. Malfunctions associated with the application of BGA soldering technologies are usually easily diagnosed by the heating method.
Before changing the tuner BN40-00331B, if it is not possible to tune to television channels, make sure that there are supply voltages that need to 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
TV users and owners need to remember that attempts to self-repair a SAMSUNG UE55M6550AU TV without the appropriate qualifications and necessary experience can lead to serious negative consequences!
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 UE55M6550AU device:
Installed matrix (LED panel) CY-VK055BGHV5V.
The matrix control uses the Timing Controller (T-CON) TT5461B07-1-C-3.
To power the backlight LEDs, a converter is used, combined with the main board BN41-02575B. As power elements of the LED driver, keys of the TO-252 type are used.
The necessary supply voltages for all nodes of the SAMSUNG UE55M6550AU TV are generated by the BN44-00872D power module or its analogs using PFC, PWM microcircuits and power switches of the N-FET TO-220F, TO-252 type.
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.
