Technical description and composition of the SAMSUNG LE32B550A5W TV, panel type and applicable modules. The composition of the modules.SAMSUNG
Model: LE32B550A5W
Chassis / Version: N68A
Panel: LTF320HA09
T-CON: 320HAC2LV0.4, THF9301, ISL24007IRZ, EM638325TS-7G, 24C64WP
Inverter (backlight): BN44-00261B
PWM Inverter: BD9893F (16),
MOSFET Inverter: 2SK3561
Power Supply (PSU): BN44-00261B
PWM Power: STR-W6252, A358F, FAN7530 (PFC)
MOSFET Power: FDPF5N50UT
MainBoard: BN41-01167C BN94-02756C
IC MainBoard: TEA6425D, WM8593SEF-T, STA339BW, K4T1G164QE-HCE7
Tuner: TDHG6-K12A
Control: BN59-01014A
Specifications LE32B550
SAMSUNG LE32B550A5W
General repair guidelines for TV LCD
It is advisable to start the diagnostics of a malfunction of the SAMSUNG LE32B550A5 TV, as well as all others, with an external examination of both external and internal elements. Specific external damage can sometimes prompt further actions to determine the malfunction of the TV and localization of the defect before the necessary measurements and waveforms are taken. Experienced repairmen are often aware of the causes of the defect and the possible consequences, for example, from ring cracks in the soldering of the leads of the elements, as well as from swollen capacitors or resistors burnt to coal dust and other external indirect signs.
In the absence of any signs of operability, when the SAMSUNG LE32B550A5 does not turn on and does not signal anything with the control lights on the panel, the power module BN44-00261B is most likely to be faulty. If the mains fuse is broken in the power supply, in most cases a breakdown of the FDPF5N50UT power switch is detected, which can be integrated with a PWM controller, or a separate field-effect transistor can be used. The rectifier bridge diodes and the electrolytic capacitor of the mains rectifier filter should also be checked.
The reasons for the breakdown of the power switch of the flyback converter of the power module can be different, for example, a malfunction of semiconductor elements or electrolytic capacitors in the stabilization circuits of the primary circuit, as well as a failure in the operation of the PWM controller chip STRW6252, A358F, FAN7530 or breakage of resistors in its bundle.
If an active Power Factor Corrector (CMC) is used in the power module circuitry, it can sometimes become more difficult to troubleshoot. Knowledge, experience, intuition and skills in such cases have a great advantage for a successful repair.
The SAMSUNG LE32B550A5 TV backlight fluorescent lamp power converter is part of the BN44-00261B general power module. Such a variant of circuitry is quite common among manufacturers and does not significantly complicate the troubleshooting of repairs at the component level.
If the SAMSUNG LE32B550A5 does not have an image, there is sound and the channels switch, there is a possibility of a malfunction of the display backlight, or their power converter - inverter. Sometimes when you turn on the image appears and disappears immediately. In such cases, it is necessary to check the electrolytic capacitors of the power filter of the inverter itself, including in the secondary rectifier of the main power supply.
Diagnostics of the BN44-00261B inverter can be difficult due to the operation of the protection, which is organized by the designers to prevent negative consequences or fires in emergency cases, for example, during short circuits or breaks in the lamp power supply circuit, as well as their possible depressurization. To make the necessary measurements at control points or to take the necessary waveforms, repairmen have to block the protection circuits in order to be able to diagnose.
All necessary precautions must be observed when disabling the inverter protection during diagnostics and not leaving it disconnected after the repair is completed.
If the motherboard BN94-02756C (BN41-01167C) is faulty, first of all it is necessary to check all the linear power regulators of its chips and, if necessary, update the software. Sometimes you can check the health of MB only by replacement. In some cases, to repair the MB (SSB) board, it may be necessary to replace the chips - TEA6425D, WM8593SEF-T, STA339BW, Tuner: TDHG6-K12A with new or obviously good ones.
Attention to users! Self-repair of a SAMSUNG LE32B550A5 TV without the appropriate qualifications and experience can lead to its complete non-repairability!
SCHEMATICS: Samsung LE32B550 Chassis N68A.
MODELS:: LE32B55*, LE37B55*, LE40B55*, LE46B55*, LE32B65*, LE37B65*, LE40B65*, LE46B65*, LE55B65*, LE32B57*, LE37B57*, LE40B57*, LE46B57*, LE32B67*, LE37B67*, LE40B67*, LE46B67*, LE55B67*, LE40B62*, LE46B62*, LE52B62*, LE40B75*, LE46B75*, LE52B75*.
PSU SCHEMATIC: BN44-00261B
The appearance of the MainBoard BN41-01167C is shown in the figure below:BN41-01167C
BN41-01167C can be used in TVs:
SAMSUNG LE32B550A5 (Panel LTF320HA09), SAMSUNG LE32B653T5W (Panel T315HW02), SAMSUNG LE32B652T4W (Panel T315HW02 V.3), SAMSUNG LE37B653T5W LE37B653 (Panel T370HW02 V.E).
PSU Advanced
The LE32B550A5 model uses a BN44-00261B power supply unit using the PFC (Power Factor Correction) node - an active filter of the highest harmonics of the current consumption. In fact, it is a boost converter based on the FAN7530 PWM controller, which eliminates the charge current of the electrolytic capacitor of the rectifier filter directly from the network through open diodes when its charging current is determined by its reactance.
As a result of the operation of the converter, the envelope of the high-frequency pulses of the input current of the converter will repeat the shape and phase of the input voltage. The health of the PFC node can be indirectly judged by the presence of an increased DC voltage (about + 380V) on the capacitor of the rectifier network in operating mode.
The appearance of the power supply
Main features of the SAMSUNG LE32B550A5W device:
Installed matrix (LCD-panel) LTF320HA09.
The matrix control uses the Timing Controller (T-CON) 320HAC2LV0.4.
To power the backlight, an inverter BN44-00261B is used, it is controlled by the PWM controller BD9893F (16) ,. As power elements of the inverter, keys of type 2SK3561 are used.
The necessary supply voltages for all nodes of the SAMSUNG LE32B550A5W TV are generated by the BN44-00261B power module or its analogs using the STR-W6252, A358F, FAN7530 (PFC) microcircuits and FDPF5N50UT power switches.
MainBoard - the main board (motherboard) is a BN41-01167C module, using TEA6425D, WM8593SEF-T, STA339BW, K4T1G164QE-HCE7 and other chips.
The TDHG6-K12A tuner provides TV reception and channel tuning.
Information from an alternative source:
Samsung LE32B550A5W Chassis N68A
Panel Type (Matrix): LTF320HA09, MAIN (AV): BN94-02756C (BN41-01167C), WM8593SEF-T, TEA6425D, STA339BW, K4T51163QG-HCE7 x4, ATMLH94402B-1 x2, ATMLH9362EB-1G, Tuner:
T-con: 320HAC2LV0.4, THF9301, ISL24007IRZ, ISL97650ARTZ, EM638325TS-7G, 24C64WP, PSU & invertor: BN44-00261B, 2SK3561 x2, FDPF5N50UT x2, STRW6252, BD989220, FD989202, FD989202, FD989302, FD989302, FDF97520B, EN, FDF, FDF, FDF, FDF
Remote control: BN59-01014A DIAGRAM BN44-00261B
