Repair SAMSUNG UE32F5300AK TV

The repair of electronic equipment usually begins with its external inspection and diagnosis of the malfunction. In this case, you should inspect all the internal components of the SAMSUNG UE32F5300AK TV. Many visible changes in the state of the elements make it possible to determine the future direction of the troubleshooting.
If the UE32F5300AK TV does not turn on, does not make any sounds when it is turned on, and also no indicators light up or blink on the front panel, there is a high probability of a malfunction in the BN44-00605A power module , which is made on the same board with the backlight LED power converter ( LED driver).  
The 220V AC voltage is rectified by a diode bridge and filtered by electrolytic capacitors, on which a constant voltage of about 300v is formed as a result. The flyback converter, controlled by the S3310 PWM controller, provides the necessary rectified voltages in the secondary circuits of the pulse transformer to power the MainBoard and Led driver. To correct the Power Factor, a passive filter of two counter-parallel chokes at the input of the network is used.
If the mains fuse is broken, it is necessary to check first of all the power semiconductor elements - rectifier diodes and transistors, which are often found in such a state of breakdown.

Mos-Fet keys used in switching power supplies (SMPS) rarely fail for no reason to look for when checking other circuit elements. Often the breakdown is caused by malfunctions of electrolytic capacitors or semiconductor elements in the primary circuit, or by a break in the resistors in the stabilization circuits. The PWM controller chip may also cause a breakdown of the power switch of the converter.

If the SAMSUNG UE32F5300AK does not have an image, the sound is there and the channels are switched, there is a possibility of a malfunction in the backlight LED circuit of the HF320BGA-B1 panel, or their power converter - the LED driver, which is a Step-Up DC-DC converter. The LED current is stabilized by the SEM5027A
PWM controller.   Sometimes, when turned on, the image appears and immediately disappears. In such cases, it is necessary to check the electrolytic capacitors of the driver power filter, including in the secondary rectifier of the main PSU.
In most cases of lack of a backlight, it becomes necessary to disassemble the panel in order to check the LEDs, connectors, loops and all contact connections. If only one or several LEDs does not work in one line, therefore, they are broken and should be replaced.
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.

Repair of the BN41-01958A motherboard must begin with the diagnosis and verification of all linear stabilizers or power converters of its microcircuits. Sometimes it may be necessary to update the software (software) - flashing FLASH or EEPROM.

If you suspect a malfunction of the tuner DNTS403EH105A (BN40-00262A), first of all, you need to make sure that there is power at the corresponding terminals and exchange via the I2C control bus.

Remember! Attempts to self-repair by users of the SAMSUNG UE32F5300AK TV without the appropriate qualifications and the necessary experience can lead to serious negative consequences

SAMSUNG LED
Model: UE32F5300A

Chassis / Version: U85A Ver: AS02

Panel: HF320BGA-B1

LED backlight: D2GE-320SC0-R3 (12,12,27) LUMENS // 2013SVS32F 9 REV1.8, BN41-01969A

T-CON: T320HVN.03.0 CTRL BD 32T36-C08

LED driver (backlight): BN44-00605A

PWM LED driver: SEM5027A

MOSFET LED driver: D9N40, D3N40

Power Supply (PSU): BN44-00605A

PWM Power: S3310 (NCP1200D60)

MOSFET Power: 10NM60N

MainBoard: BN41-01958A BN94-06181P // BN41-01958B

IC MainBoard: CPU: SEMS30, SPI FLASH: W25Q40, SDRAM: K4B2G1646E

Tuner: DNTS403EH105A (BN40-00262A)

SAMSUNG Version Model: UE32F5300AK, Ver: TSO3, Panel: CY-HF320BGLV1H, MAIN: BN94-06523F, PSU: BN44-00605A; LED backlight: D2GE-320SC0-R3 (12,12,27)

The appearance of the MainBoard BN41-01958B is shown in the figure below:

BN41-01958B can be used in TVs:

SAMSUNG UE39F5500 UE39F5500AK (Panel HF390BGM-C1), SAMSUNG UE32F5300AK (Panel HF320BGA-B1), SAMSUNG UE40F6200AK (Panel CY-HF400BGLV2V), SAMSUNG UE32F4500AK (Panel HFVF42HF42HFBHFBHF42HFBHFBHFBHFHFH Panel CY-HF400CSLV1V), SAMSUNG UE46F6330AK UE46F6330 (Panel CY-HF460CSLV2V), SAMSUNG UE32F6330 AK (Panel CY-HF320CSLV1V), SAMSUNG UE40F6330AK UE40F6330 (Panel CY-HF400CSLV5V), SAMSUNG UE40F6510AB UE40F6510 (Panel CY-GF400CSLV2V), SAMSUNG UE55F6400AK UE55F6400 ( Panel CY-HF550CSLV1V), SAMSUNG UE40F6540AB (Panel CY-GF400CSLV3V), SAMSUNG UE40F6500 UE40F6500SS (Panel CY-GF400CSLV1H), SAMSUNG UE46F6650 UE46F6650AB (Panel CY-GF460CSLV1V), SAMSUNG UE46F6510 UE46F6510AB (Panel CY-GF460CSLV2V), SAMSUNG UE50F6330 UE50F6330AK (Panel HF500CSA-B1).

The appearance of the power supply :