Technical description and composition of the SAMSUNG LE40B551 TV, panel type and applicable modules. The composition of the modules.SAMSUNG
Model: LE40B551 LE40B551A6W
Chassis / Version: N68A
Panel: LTF400HA08
T-CON: FHD60C4L V1.1; THF9301, 24C64WP, MAX9591, TPS65167A, I7814HS
Inverter (backlight): integrated into PSU
PWM Inverter: BD9893F
MOSFET Inverter: STP9NK50ZFP
Trans Inverter: QGAH02101
Power Supply (PSU): BN44-00264C
PWM Power: FAN7530 (PFC), 3BR1065JF
MOSFET Power: 11N60PFC, FQPF9N50C
MainBoard: BN41-01167B BN94-02668M
IC MainBoard: MX25L6405D, K4T511630G-HCE7, WM8593SEFT, WM8521H9GEO, STA339BW, ATMLH9362EB-1
Tuner: BN40-00145A
Technical specifications LE40B551
SAMSUNG LE40B551
General repair guidelines for TV LCD
Possible malfunctions
- SAMSUNG LE40B551 does not turn on and does not show any signs of performance at all. Does not blink indicators and does not respond to control buttons.
Failure in such cases should begin to be sought in the power supply circuits of BN44-00264C. 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 (11N60PFC, FQPF9N50C) and rectifier diodes of the converters for possible short circuit.
In case of breakdowns of semiconductors in the secondary circuits, the converter can usually work abnormally in the short circuit mode, and during short circuit in the power elements of the primary circuit, the mains fuse often breaks.
Mos-Fet power switches, used in switching power supplies, sometimes fail due to a malfunction of any other elements that can put it out of operation in key mode or create an excess of the maximum permissible parameters of the switch. These can be elements supplying the PWM controller, frequency-setting or damping circuits, or negative feedback elements in the stabilization circuit. PWM controllers FAN7530 (PFC), 3BR1065JF, in the absence of visible damage or open faults between the terminals, are checked by replacing with new ones, or obviously working.
- There is no image, there is sound, it responds to the remote control, the channels are switched. In some cases, the image appears when you turn on and immediately disappears.
These manifestations can be triggered by a power supply module, or by inverter defects, as well as distortion of the currents in the lamps due to their uneven wear. If all the electrolytic capacitors of the filter according to the inverter power supply are serviceable, you should make sure that the lamps are in good working condition, then you need to check the converter keys and the secondary windings of the transformers.
If in diagnosing a malfunction, it is necessary to disable the inverter protection, there is a risk of failure of the power elements of the inverter, and special care is required during operations, and after their completion, it is necessary to restore the protection circuits for further safe operation of the TV by the owner in normal mode.
- The TV does not enter the operating mode, does not respond to the remote control. The indicator on the front panel lights up constantly or blinks.
Repair or diagnostics of the BN41-01167B 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). Sometimes it is necessary to check or replace (if necessary) the elements of the MainBoard board - MX25L6405D, K4T511630G-HCE7, WM8593SEFT, WM8521H9GEO, STA339BW, ATMLH9362EB-1. In cases where the BGA processor is used, its malfunction is usually detected by the local heating method.
If there is no reception of television channels, but the TV is working properly from external devices, first of all, check the voltage of the tuner BN40-00145A and update the software. The pulses from the I2C bus must be controlled with an oscilloscope.
Owners and users of the SAMSUNG LE40B551 TV should remember that self-repair without special knowledge, skills and qualifications can be fraught with negative consequences that can lead to complete non-repairability of the device!
Service manual -----------> SAMSUNG LE40B551 Chassis N68A на модели LE32B550, LE32B551, LE32B553, LE32B554, LE37B550, LE37B551, LE37B553, LE37B554, LE40B550, LE40B551, LE40B553, LE40B554, LE46B550, LE46B551, LE46B553, LE46B554, LE32B579, LE37B579, LE40B579, LE46B579, LE40B620, LE46B620, LE52B620, LE32B650, LE32B651, LE32B652, LE32B653, LE37B650, LE37B651, LE37B652, LE37B653, LE40B650, LE40B651, LE40B652, LE40B653, LE46B650, LE46B651, LE46B652, LE46B653, LE55B650, LE55B651, LE55B652, LE55B653, LE32B679, LE37B679, LE40B679, LE46B679, LE55B679, LE40B750, LE46B750, LE52B750.
PSU SCHEMATIC---------> BN44-00264C.
The appearance of the MainBoard BN41-01167B is shown in the figure below:BN41-01167B
BN41-01167B can be used in TVs:
SAMSUNG LE40B550A5W (Panel LTF400HA08 A03), SAMSUNG LE32B551A6W LE32B551 (Panel LTF320HA09), SAMSUNG LE40B653 LE40B653T5W (Panel T400HW02 V.5), SAMSUNG LE37B652T4W LE37B65H02 panel Panel T37H4040402G V.
The appearance of the power supply
Main features of the SAMSUNG LE40B551 device:
Installed matrix (LCD panel) LTF400HA08.
The matrix control uses the Timing Controller (T-CON) FHD60C4L.
To power the backlight, a converter is used, combined with a power supply, controlled by the BD9893F PWM controller. A transformer QGAH02101 is installed in the inverter converter. As power elements of the inverter, keys of the STP9NK50ZFP type are used.
The necessary supply voltages for all nodes of the TV SAMSUNG LE40B551 are formed by the power module BN44-00264C, or its analogs using microchips FAN7530 (PFC), 3BR1065JF and power switches of the type 11N60PFC, FQPF9N50C.
MainBoard - the main board (motherboard) is a module BN41-01167B, using microchips MX25L6405D, K4T511630G-HCE7, WM8593SEFT, WM8521H9GEO, STA339BW, ATMLH9362EB-1 and others.
The tuner BN40-00145A provides the reception of television programs and tuning to channels.