Technical description and composition of the SAMSUNG LE37C550J1W TV, panel type and applicable modules. The composition of the modules.SAMSUNG
Model: LE37C550J1W
Chassis / Version: N82A
Panel: T730HW03
Inverter (backlight): E206453 V298-5xx
Power Supply (PSU): BN44-00339B
PWM Power: FSFR1700US, FAN7530 (PFC), STR-A6052
MOSFET Power: SD10N60
MainBoard: BN41-01536A
IC MainBoard: WT61P802, SOUND: NTP7300S, DRAM: K4T1G164QF
Tuner: BN40-00197A DTOS40FVL082A
Technical Specifications LE37C550
SAMSUNG LE37C550J1W
General repair guidelines for TV LCD
Repair of the SAMSUNG LE37C550J1W TV should begin with a fault diagnosis, which involves a careful examination of the external and internal elements of the device. Visible damage to the elements can sometimes indicate the direction of the search for the defect even before the start of the necessary measurements. In most cases, the repairman can guess the causes of the defect and possible consequences by the characteristic signs of typical TV defects, for example, ring cracks formed in the soldering of element outputs, swollen rectifier filter capacitors, charred resistors and other circuit elements.
Sometimes the SAMSUNG LE37C550J1W TV simply does not turn on. No control lights on the front panel are lit or blinking, the TV does not respond to the remote control and does not make any sounds or any signs of life when turned on. The most likely cause of the malfunction is the failure of the BN44-00339B common power module. If it is working properly, you must check the standby batteries on the Main Board. In the general case, first of all, it is necessary to check the electrolytic capacitors of the secondary rectifier filters and the fuse at the input of the network. If it is broken, then you should check for breakdown of the PN junctions of the rectifier bridge diodes and the key transistor of the converter, which can either be on a separate radiator or integrated with a PWM controller in a common chip. There are options for SD10N60.
The reasons for the breakdown of the power switch in switching power supplies (IIPS) can be different, for example, a malfunction of semiconductor cells or electrolytic capacitors in the stabilization circuits of the primary circuit, as well as a failure in the operation of the PFM controller FSFR1700US, FAN7530 (PFC), STR-A6052 or breakage of resistors in its harness.
If the SAMSUNG LE37C550J1W does not have an image, but there is sound, there is a possibility of a malfunction of the backlight or power converter. You should also make sure that the electrolytic capacitors of the secondary rectifiers of the common power supply are working. When diagnosing a malfunction of the inverter with the protection turned off, special care must be taken, because there is a risk of failure of the power elements of the inverter. After the diagnosis, it is imperative to restore the protection circuits for the inverter to operate normally.
If the motherboard BN41-01536A is faulty, first of all it is necessary to check all the linear stabilizers and power converters of its chips, and also, if necessary, update the software (software). Sometimes you can check the health of MB only by replacement. When repairing an MB board, you need to check its components WT61P802, SOUND: NTP7300S, DRAM: K4T1G164QF. 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.
If a tuner BN40-00197A DTOS40FVL082A 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 data exchange pulses with the processor via the I2C bus at the corresponding tuner pins.
It is necessary to remember to users that attempts to self-repair a SAMSUNG LE37C550J1W TV without the appropriate qualifications and necessary experience can lead to serious negative consequences!
SCHEMATICS: ------> Samsung Chassis N82A.
FOR MODELS: Samsung LE32C53***, LE37C53***, LE40C53***, LE46C53***, LE32C57***, LE37C57***, LE40C57***, LE46C57***, LE32C55***, LE37C55***, LE40C55***, LE46C55***, LE26C45***, LE32C45***
SCHEMATICS PSU ------> Samsung BN44-00339B Power supply.
The appearance of the MainBoard BN41-01536A is shown in the figure below:BN41-01536A
BN41-01536A can be used in TVs:
SAMSUNG LE37C530F1W (Panel T370HW03 VG xxxxG), SAMSUNG LE37C550J1W (Panel T730HW03), SAMSUNG LE32C454 LE32C454E3W (Panel LTF320AP08), SAMSUNG LE26C454 LE26C454E36004 Panel.
PSU Advanced
The power module BN44-00339B is made using a Power Factor Correction (PFC) scheme to eliminate multiple AC harmonics introduced into the power supply by the device. The PFC assembly is a Step-Up Converter based on a FAN7530 PWM controller that evenly distributes high-frequency impulses of the charging current of the electrolytic capacitor of the rectifier filter of the mains voltage over a period of 50 Hz. The current of its charge in this case will already be determined not by its reactance (usually 10-30 ohms for the network frequency), but by the elements of the converter. As a result, a change in the amplitude of the pulses (envelope) of the consumed current of the converter will repeat the shape and phase of the input sinusoidal voltage. The availability of the increased voltage (about + 380V) in the operating mode on the capacitor of the line filter indicates the serviceability of the PFC node.
The appearance of the power supply
Main features of the SAMSUNG LE37C550J1W device:
Installed matrix (LCD panel) T730HW03.
The inverter E206453 is used to power the backlight.
The necessary supply voltages for all nodes of the TV SAMSUNG LE37C550J1W are formed by the power module BN44-00339B, or its analogs using microchips FSFR1700US, FAN7530 (PFC), STR-A6052 and power switches of the SD10N60 type.
MainBoard - the main board (motherboard) is a BN41-01536A module, using WT61P802 chips, SOUND: NTP7300S, DRAM: K4T1G164QF and others.
The tuner BN40-00197A DTOS40FVL082A provides the reception of television programs and tuning to channels.