Technical description and composition of the SAMSUNG LE32B551A6W TV, panel type and applicable modules. The composition of the modules.SAMSUNG
Model: LE32B551A6W LE32B551
Chassis / Version: SQ02
Panel: LTF320HA09
T-CON: 320HAC2LV0.2
Inverter (backlight): integrated into PSU
PWM Inverter: BD9893F
MOSFET Inverter: 2SK3561
Power Supply (PSU): BN44-00261B (H32F1_9DY)
PWM Power: STR-W6252, A358F, FAN7530 (PFC)
MOSFET Power: FDPF5N50UT
MainBoard: BN41-01167B BN94-02668L
IC MainBoard: MX25L6405D, K4T511630G-HCE7, WM8593SEFT, WM8521H9GEO, STA339BW, ATMLH9362EB-1
Tuner: BN40-00145A
Control: Remote: BN59-00863A, R BN96-10382B BN41-01192A
Technical Specifications LE32B551
SAMSUNG LE32B551A6W
General repair guidelines for TV LCD
Possible manifestations of defects
- The SAMSUNG LE32B551A6W TV does not turn on, does not respond to the remote control and buttons on the control panel, does not light up or blink indicators.
Failure in such cases should begin to be sought in the power supply circuits BN44-00261B. It is necessary to measure the output voltages in its secondary circuits, and if they are completely absent, check the serviceability of the power switches (FDPF5N50UT) and rectifier diodes for possible breakdown (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 STR-W6252, A358F, FAN7530 (PFC), in the absence of visible damage or explicit short-circuit between the terminals, are checked by replacing with new, or obviously working.
- There is no image, there is sound, it responds to the remote control. Or the image may appear for a second when turned on and immediately disappears.
A defect can be caused by problems in the nodes or elements of the backlight of the display, or in the power supply of the lamps or the inverter.After checking all the electrolytic capacitors of the filters that are involved in the power supply of the inverter, the breakdown keys and the transformer secondary windings must be ringed in its converter.
Sometimes, for diagnostic purposes, it is necessary to disable the inverter protection. In such cases, special care must be taken during work, and the protection circuits should be restored immediately after the repair is completed.
- The TV does not turn on, the indicator signals standby or working mode, 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). When repairing an MB board, you need to check its components MX25L6405D, K4T511630G-HCE7, WM8593SEFT, WM8521H9GEO, STA339BW, ATMLH9362EB-1. 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 the TV works normally from external devices, but does not tune into television channels, the tuner BN40-00145A may be malfunctioning. In such cases, first of all, you should make sure that there are supply voltages at its corresponding terminals. It is also necessary to make sure that the tuner and processor can exchange data via the I2C bus. Sometimes the cause of the inoperability of the tuner may be a software failure.
It should be remembered! Attempts to independently repair the SAMSUNG LE32B551A6W TV, in the absence of the necessary qualifications and experience, are categorically not recommended and are fraught with negative consequences, up to the complete non-repairability of the device!
SCHEMATICS PSU: Samsung BN44-00261B Power supply.
The main view of 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 LE32B551A6W device:
Installed matrix (LCD-panel) LTF320HA09.
The matrix control uses the Timing Controller (T-CON) 320HAC2LV0.2.
To power the backlight, a converter is used, combined with a power supply, controlled by the BD9893F PWM controller. As power elements of the inverter, keys of type 2SK3561 are used.
The necessary supply voltages for all nodes of the SAMSUNG LE32B551A6W television 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 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.
