SAMSUNG UE42F5020 TV description and composition, panel type and applicable modules. The composition of the modules.SAMSUNG LED
Model: UE42F5020 UE42F5020AK
Chassis / Version: U85B / U85C
Panel: T420HVF05.0 (HF420BGA-B1)
LED backlight: D2GE-420SCA-R3, D2GE-420SCB-R3
T-CON: T500HVN05.0 CTRL BD 50T11-C02
LED driver (backlight): integrated into PSU
PWM LED driver: AOZ1948AI
Power Supply (PSU): BN44-00609A L42SF-DSM
PWM Power: S3050 (PFC), ADP3110A, D2011K (Stb)
MainBoard: BN41-01955A BN94-06292R
IC MainBoard: CPU: SEMS29, SPI Flash: W25Q40BL, EEPROM: 24C256C, SOUND: NTP7412S
Tuner: BN40-00256A
Technical Specifications UE42F5020
SAMSUNG UE42F5020
General repair guidelines for TV LCD LED
Possible malfunctions
- The SAMSUNG UE42F5020 TV does not turn on, does not respond to the remote control and the control panel buttons, does not light up or blink indicators.
In some of these cases, the main switching power supply, the BN44-00609A module, is faulty. Then it is necessary to measure its output voltages 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.
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 chips S3050 (PFC), ADP3110A, D2011K (Stb) are usually checked by replacing with new ones, or obviously working.
- There is no image, but there is sound, it reacts to the remote control. Or the image appears when you turn on and immediately disappears
Often in such cases, there is no LED backlight. The reason can be both in the power supply of the LEDs, in their serviceability (breakdown or breakage), as well as in the violation of the contact connections of the LED strips.
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.
- The indicator blinks or glows constantly, the TV does not turn on, does not respond to the remote control.
Repair or diagnostics of the BN41-01955A 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). When repairing an MB board, you need to check its CPU components: SEMS29, SPI Flash: W25Q40BL, EEPROM: 24C256C, SOUND: NTP7412S. Defective items should be replaced. If chips with BGA soldering technology are used, a problem in its implementation is detected by the local heating of the chip.
The malfunction of the tuner BN40-00256A is established after checking the software and all the 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, remind users! Attempts to self-repair a SAMSUNG UE42F5020 TV without the appropriate qualifications and necessary experience can lead to its complete non-repairability!
Service manual --------------------> SAMSUNG UE42F5020AK Chassis U85B / U85C UE42F5020AK
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).
The appearance of the power supply
Main features of the SAMSUNG UE42F5020 device:
Installed matrix (LED panel) T420HVF05.0 (HF420BGA-B1).
The matrix control uses the Timing Controller (T-CON) T500HVN05.0.
To power the backlight LEDs, a converter is used, combined with a power supply, controlled by the AOZ1948AI PWM controller.
The necessary supply voltages for all nodes of the SAMSUNG UE42F5020 TV are generated by the BN44-00609A power module or its analogs using S3050 (PFC), ADP3110A, D2011K (Stb) 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 BN40-00256A provides the reception of television programs and tuning to channels.