Technical description and composition of the SAMSUNG UE42F5000AK TV, panel type and applicable modules. The composition of the modules.SAMSUNG LED
Model: UE42F5000AK UE42F5000
Chassis / Version: Ver. AS01
Panel: HF420BGA-B1 // HF420BGAV1V
LED backlight: 2013SVS42F_L_9 Rev1.8 130103; 2013SVS42F_R_5 Rev1.8 130103 Direct Led
T-CON: 50T11-C02 T500HVN05.0 Ctrl BD
LED driver (backlight): integrated into PSU; 136V 280mA, 182V 280mA, 147V 280mA, 195V 280mA
PWM LED driver: Z1948AI
Power Supply (PSU): BN44-00609A L42SF_DSM
PWM Power: S3050 (PFC), ADP3110A, D2011K (Standby)
MainBoard: BN41-01955A BN94-06292R
IC MainBoard: CPU: SEMS29; SPI Flash: W25Q40BL; EEPROM: 24C256C; SOUND: NTP7412S;
Tuner: BN40-00262A
Technical Specifications UE42F5000
SAMSUNG UE42F5000AK
General repair guidelines for TV LCD LED
If the UE42F5000AK TV does not turn on, does not make any sounds when it is turned on, and also no indicators on the front panel light or blink, there is a high probability of a malfunction in the power module. In some cases, there may be a malfunction only in standby power. When repairing the power supply, it is advisable to start the diagnostics by checking the mains fuse and the electrolytic capacitors of the filters of the converter secondary rectifiers. In the event of a fuse breaking, the reason should be sought in the power semiconductor elements of the pulse converter of the main power supply. First of all, it is necessary to check the diodes of the rectifier bridge of the mains voltage and the power key (s) of the converter. The complete inoperability of the power supply unit can be caused by a short circuit of the power elements in the primary circuit, followed by an open fuse, or a short circuit in the loads.
It should be borne in mind that in the practice of repair it is extremely rare that key transistors in switching power supplies (SMPS) fail for no reason that should be sought by checking other components, for example, a breakdown of the key can provoke faulty elements of the damper circuits, or dried electrolytic capacitors or dangling primary resistors BP circuits involved in the stabilization process. In this case, all semiconductor elements of the strapping of the PWM regulator chip S3050 ADP3110A D2011K are subject to verification, which it is desirable to verify by replacement.
If the SAMSUNG UE42F5000AK TV does not have an image, but there is sound, a malfunction in the backlight circuits of the LED panel HF420BGA-B1 // HF420BGAV1V is likely.
The lack of backlight often occurs due to an open circuit in the LED circuit. There is a need for disassembling the panel and checking the LEDs themselves, as well as the same contact connections in the connectors and rations of the terminals.
It is impossible to check the LED line for breaks without disassembling the panel with a multimeter or tester. For these purposes, it is necessary to open all series-connected PN junctions and a voltage of the order of tens of volts will be required, and ideally, a current source. Having disassembled the panel, it is necessary to check each LED separately. Chinese multimeters, as a rule, light up a single 3-volt LED in the forward direction. In the case of using dual 6-volt LEDs, the PN junction of its protective zener diode can serve as an indicator of serviceability. In faulty LEDs, the zener diode will either be cut off or broken into short-circuit.
Diagnosis and repair of the BN41-01955 A BN94-06292R motherboard usually begins with a test of the performance of the stabilizers and power converters of the module chips. In some cases, a software update is required.
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: SEMS29; SPI Flash: W25Q40BL; EEPROM: 24C256C; SOUND: NTP7412S; and other possible malfunctioning components. Malfunctions associated with the application of BGA soldering technologies are usually easily diagnosed by the heating method.
The malfunction of the tuner BN40-00262A is established after checking the software and all supply voltages at its terminals. The data exchange of the tuner with the processor via the I2C bus can be controlled by an oscilloscope.
Once again, we remind TV users: you should not make attempts to repair it yourself without the appropriate knowledge, experience and the necessary qualifications! Trust the repair only to professionals with sufficient experience in the field of repair of electronic equipment.
The appearance of the MainBoard BN41-01955A is shown in the figure below:
BN41-01955A
BN41-01955A can be used in TVs:
SAMSUNG UE32F5000AK (Panel CY-HF320BGSV1V), SAMSUNG UE32F5020AK (Panel T320HVF03.0), SAMSUNG UE42F5000AK UE42F5000 (Panel HF420BGA-B1), SAMSUNG UE46F5000AK UE46F5000 (Panel CY-HF460BGLV1V), SAMSUNG UE32F4800AW UE32F4800 (Panel CY-HF320AGLV2V).
PSU Advanced
The BN44-00609A power module is installed in the UE42F5000AK TV using the PFC (Power Factor Correction) scheme acting as an active filter to eliminate the higher harmonic components of the current consumption. The boost converter based on the S3050 PWM controller does not allow the electrolytic capacitor of the input rectifier filter to be connected directly to the network directly through open diodes, when the reactance determines the charge current (about 15-30 ohms at a frequency of 50 Hz). As a result of the conversion, the charging current of the capacitor will be determined in such a way that the envelope of the high-frequency pulses of the input current will repeat the phase and shape of the sine wave of the input voltage. The health check of the PFC unit is carried out by measuring the DC voltage on the capacitor of the rectifier network. In operating mode, it should be around 380V, in standby approximately 300V.
The appearance of the power supply
Main features of the SAMSUNG UE42F5000AK device:
Installed matrix (LED panel) HF420BGA-B1 or HF420BGAV1V.
The matrix control uses the Timing Controller (T-CON) 50T11-C02.
To power the backlight LEDs, a converter is used, combined with a power supply, controlled by the Z1948AI PWM controller.
The necessary supply voltages for all nodes of the SAMSUNG UE42F5000AK TV are generated by the BN44-00609A power module or its analogs using S3050 (PFC), ADP3110A, D2011K (Standby) microcircuits.
MainBoard - the main board (motherboard) is a BN41-01955A module, using CPU chips: SEMS29; SPI Flash: W25Q40BL; EEPROM: 24C256C; SOUND: NTP7412S; and others.
The tuner BN40-00262A provides the reception of television programs and tuning to channels.