Technical description and composition of the SAMSUNG UE49MU7500U TV, panel type and applicable modules. The composition of the modules.SAMSUNG LED
Model: UE49MU7500U
Chassis / Version: BN41-02568A
Panel: CY-VK049HGLV2
LED backlight: LM41-00330A & LM41-00329A
LED driver (backlight): integrated into PSU
Power Supply (PSU): BN44-00876A L55E6_KHS
PWM Power: PFC, PWM
MOSFET Power: N-FET TO-220F
MainBoard: BN41-02568A BN94-11910N
IC MainBoard: SDP1601, KLM4G1FEPD, K4F8E30 4HBMGCH, 24512FD, 25Q40CLSIP, 25Q80DVSIG
Tuner: BN40-00331A
Technical Specifications UE49MU7500U
SAMSUNG UE49MU7500U
General repair guidelines for TV LCD LED
Possible malfunctions
- The SAMSUNG UE49MU7500U 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.
With such manifestations, the BN44-00876A power module usually fails. In the absence of the necessary supply voltages in the secondary circuits of the converters, it is necessary to check the power switches (N-FET TO-220F) and rectifier diodes for a possible partial or complete breakdown.
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 mains 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, but there is sound and reaction to the remote control. Or for a second, the image may appear immediately after switching on.
Usually in such cases, a malfunction is detected in the backlight nodes of the LED panel. The reason may be a break in the LEDs, in the stabilization of their power supply, or in the violation of the contact connections of the strings
It should be remembered that it is not possible to determine the break in the LED lines without disassembling the panels using a tester or multimeter without an additional device, for example, a current source. To open all PN junctions connected in series at once, a voltage of several tens of volts may be required. Then it is necessary to open the panel and check each LED separately with a multimeter. If the capabilities of your multimeter do not allow you to open the LED in the forward direction or dual LEd are used, then the PN junction of the emergency zener diode can indirectly serve as a health indicator. In case of LED-a failure, the zener diode PN junction 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 BN41-02568A 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 attempts to repair the MB (SSB) board, it is necessary to check the health of its elements - SDP1601, KLM4G1FEPD, K4F8E30 4HBMGCH, 24512FD, 25Q40CLSIP, 25Q80DVSIG which may require replacement with new ones. If a BGA processor is installed, there is a possibility of a violation of the soldering of the contacts of its conclusions with the board (it is diagnosed by heating).
Before changing the tuner BN40-00331A, if there is no possibility of tuning to television channels, you should make sure that there are supply voltages that must 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
Owners and users of the SAMSUNG UE49MU7500U TV should remember that self-repair without special knowledge, skills and qualifications can be fraught with negative consequences that can lead to complete non-repairability of the device!
The appearance of the MainBoard BN41-02568A is shown in the figure below:BN41-02568A
The appearance of the power supply
Main features of the SAMSUNG UE49MU7500U device:
Installed matrix (LED panel) CY-VK049HGLV2.
To power the backlight LEDs, a converter is used, combined with a power supply.
The necessary supply voltages for all nodes of the SAMSUNG UE49MU7500U TV are generated by the BN44-00876A power module or its analogs using PFC, PWM microcircuits, and N-FET TO-220F type power switches.
MainBoard - the main board (motherboard) is a BN41-02568A module, using microchips SDP1601, KLM4G1FEPD, K4F8E30 4HBMGCH, 24512FD, 25Q40CLSIP, 25Q80DVSIG and others.
The tuner BN40-00331A provides the reception of television programs and tuning to channels.
