Technical
description and composition of the SAMSUNG UE40MU6400U TV, panel type
and applicable modules. The composition of the modules.SAMSUNG LED
Model: UE40MU6400U UE40MU6400
Chassis / Version: BN41-02568B
Panel: CY-KK040HGNV2V
LED driver (backlight): integrated into PSU
Power Supply (PSU): BN44-00875C L40E6R_KSM
PWM Power: PFC, PWM
MOSFET Power: TO-252
MainBoard: BN41-02568B BN94-11921Y
IC MainBoard: SDP1601, KLM4G1FEPD, 24512FD, 25Q40CLSIP, 25Q80DVSIG, TAS5749M
Tuner: BN40-00331A
Control: Wi-Fi: WCM730Q
Technical Specifications UE40MU6400U
SAMSUNG UE40MU6400U
General repair guidelines for TV LCD LED
Possible malfunctions
- The SAMSUNG UE40MU6400U 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.
With similar manifestations, in some cases, the BN44-00875C power module is faulty. Then it is necessary to measure its output voltage and, in case of their complete or partial absence, it is necessary to check the serviceability of power switches and rectifier diodes of the converters for the presence of a possible 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.
Mos-Fet keys used in switching power supplies usually fail due to a malfunction of other elements that can put it out of operation in key mode or provoke an excess of the maximum current or voltage. These can be circuits supplying the PWM controller, damping or frequency-setting circuits, or elements of OOS (negative feedback) in the stabilization circuit. PWM controllers (PWM), in the absence of external damage and a short circuit between the terminals, are checked by replacing with obviously good ones.
- There is no image, but there is sound and all the other functions of the TV work. The image sometimes for a second appears immediately after turning on and disappears.
Failure is usually in these cases is the backlight matrix (LED-panel). The reason for this may be a break in the LED circuit, or a problem in stabilizing their power supply.
To check the LED lines for breaks without disassembling the panel, for example, a current source will help. It is impossible to open series-connected PN junctions with a simple multimeter, a voltage of the order of several tens of volts is required.
- The TV does not enter the operating mode, does not respond to the remote control. The indicator on the front panel lights up constantly or blinks.
Repair or diagnostics of the BN41-02568B motherboard should begin by checking the stabilizers and power converters needed to power the chips and matrix. If necessary, you should update or replace the software (software). Complex repair of MB (SSB) is possible only in the conditions of a service center with the necessary equipment. Checking or replacing elements SDP1601, KLM4G1FEPD, 24512FD, 25Q40CLSIP, 25Q80DVSIG, TAS5749M requires the necessary training and professional skills in repairing modules at the component level. Problems associated with the use of BGA soldering technologies can sometimes be diagnosed by warming up.
If a tuner BN40-00331A 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 voltage levels and impulses of data exchange with the processor via the I2C bus at the corresponding tuner pins.
We recommend the owners of the UE40MU6400U TV for repair only to qualified specialists with the necessary work experience! Attempts to repair it yourself without the appropriate knowledge and skills can lead to irreversible negative consequences!
The appearance of the MainBoard BN41-02568B is shown in the figure below:BN41-02568B
The appearance of the power supply
Main features of the SAMSUNG UE40MU6400U device:
Installed matrix (LED-panel) CY-KK040HGNV2V.
To power the backlight LEDs, a converter is used, combined with a power supply.
The necessary supply voltages for all nodes of the SAMSUNG UE40MU6400U TV are generated by the BN44-00875C power supply module or its analogs using PFC, PWM microcircuits, and TO-252 type power switches.
MainBoard - the main board (motherboard) is a BN41-02568B module, using microchips SDP1601, KLM4G1FEPD, 24512FD, 25Q40CLSIP, 25Q80DVSIG, TAS5749M and others.
The tuner BN40-00331A provides the reception of television programs and tuning to channels.