Technical description and composition of the SAMSUNG LE40D550K1W TV, panel type and applicable modules. The composition of the modules.SAMSUNG
Model: LE40D550K1W LE40D550
Panel: LTF400HM03
T-CON: S100FAPC2LV0.3
Inverter (backlight): SST400_12A01 INV40T12A
Power Supply (PSU): BN44-00440A
PWM Power: ICE3BR1765J (Standby), SEM3040 (PFC), UCC25600 (PWM resonant 8pin)
MOSFET Power: TK8A50D (PFC x2), FDPF12N50UT x2
MainBoard: BN41-01603C - BN94-05106B
IC MainBoard: Eeprom: 24C256, Submicom: WT61P805
Tuner: BN40-00197A DTOS40FVL082A
Control: IR: A16729F - BN41-01600A - D550-12C
Technical specifications LE40D550
SAMSUNG LE40D550K1W
General repair guidelines for TV LCD
Possible malfunctions
- The SAMSUNG LE40D550K1W TV does not turn on and does not show any signs of turning on. There are no reactions to the control buttons or the remote control.
With such manifestations, a malfunction is most likely to be detected in a switching power supply - the BN44-00440A module. It is necessary to measure its output voltages and, if they are completely absent, check the power switches (TK8A50D (PFC x2), FDPF12N50UT x2) and rectifier diodes for the probability of short circuit in the converters. The operability of the standby converter, made on the PWM controller ICE3BR1765J (Standby), must be checked first.
In the event of a breakdown of the semiconductor elements in the secondary circuits, the converters can fail in short circuit mode, and during a short circuit in the power elements of the primary circuit, the mains fuse usually breaks.
Mos-Fet keys used in switching power supplies usually fail due to a malfunction of other elements that can put it out of operation in key mode or provoke an excess of the maximum current or voltage. It can be supply, damper circuits, or elements of OOS (negative feedback) stabilization.
PWM controllers (PWM) ICE3BR1765J (Standby), SEM3040 (PFC), UCC25600 (PWM resonant 8pin) are usually checked by replacing with obviously working ones.
The health of the PFC node can be indirectly judged by the presence of an increased (380-400V) voltage across the filter capacitor of the network rectifier.
- There is no image, there is sound, it responds to the remote. Or the image may appear for a second when turned 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. After checking all the electrolytic capacitors of the filters that are involved in the power supply of the inverter, it is necessary to ring in its converter the power switches for breakdown and the secondary windings of transformers for an open.
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 BN41-01603C 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). In cases of complex repairs of MB (SSB) and in the presence of the necessary skills and equipment, sometimes it may be necessary to replace its Eeprom: 24C256, Submicom: WT61P805 chips and other possible faulty components. Malfunctions associated with the application of BGA soldering technologies are usually easily diagnosed by the heating method.
Before replacing the BN40-00197A DTOS40FVL082A tuner, if there is no tuning for the channels, you must first check the software and the supply voltage at its terminals. It is also necessary to make sure that the tuner and processor can exchange data via the I2C bus
It should be remembered! Attempts to independently repair the SAMSUNG LE40D550K1W 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 ---------> BN44-00440A Power Supply schematic diagram.
The appearance of the MainBoard BN41-01603C is shown in the figure below:BN41-01603C
BN41-01603C can be used in TVs:
SAMSUNG LE32D451 LE32D451G3W (Panel T315XW03 VD), SAMSUNG LE40D550K1W LE40D550 (Panel LTF400HM03), SAMSUNG LE26D451 LE26D451G3W (Panel T260XW04 V.8), SAMSUNG LE40D551 LE40D551K2W (Panel LTF400HM03), SAMSUNG LE32D450 LE32D450G1W (Panel T315XW03 VD), SAMSUNG LE37D550 LE37D550K1W (Panel T370HW03 VP).
PSU Advanced
The LE40D550K1W TV is equipped with a BN44-00440A power module using the PFC (Power Factor Correction) scheme acting as an active filter to eliminate the higher harmonic components of the current consumption. The boost converter based on the SEM3040 PWM controller does not allow the input rectifier filter's electrolytic capacitor to be connected to the network directly through open diodes, when the reactance (about 15-30 ohms at a frequency of 50 Hz) determines the charge current. As a result of the conversion, the charging current of the capacitor will be determined in such a way that the envelope of the high-frequency pulses of the input current will repeat the phase and shape of the sine wave of the input voltage. The health check of the PFC unit is carried out by measuring the DC voltage on the capacitor of the rectifier network. In operating mode, it should be around 380V, in standby approximately 300V.
The appearance of the power supply
Main features of the SAMSUNG LE40D550K1W device:
Installed matrix (LCD-panel) LTF400HM03.
The matrix control uses the Timing Controller (T-CON) S100FAPC2LV0.3.
The inverter SST400_12A01 is used to power the backlight.
The necessary supply voltages for all nodes of the SAMSUNG LE40D550K1W TV are generated by the BN44-00440A power module or its analogs using ICE3BR1765J (Standby), SEM3040 (PFC), UCC25600 (PWM resonant 8pin) microcircuits and TK8A50D (PFC x250), FDP type power switches x2.
MainBoard - the main board (motherboard) is a BN41-01603C module, using Eeprom: 24C256, Submicom: WT61P805 and others.
The tuner BN40-00197A DTOS40FVL082A provides the reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: SAMSUNG
Model: LTF400HM03-V02
Type: a-Si TFT-LCD, Panel
Diagonal size: 40 inch
Resolution: 1920x1080, FHD
Display Mode: SPVA, Normally Black, Transmissive
Active Area: 885.6x498.15 mm
Surface: Antiglare (Haze 5.5%), Hard coating
Brightness: 450 cd / m²
Contrast Ratio: 5000: 1
Display Colors: 16.7M (8-bit), CIE1931 72%
Response Time: 8 (G to G)
Frequency: 60Hz
Lamp Type: 12 pcs CCFL Embedded (Balance board)
Signal Interface: LVDS (2 ch, 8-bit), 51 pins
Voltage: 12.0V