Technical description and composition of the SAMSUNG LE40C750R2W TV, panel type and applicable modules. The composition of the modules.SAMSUNG
Model: LE40C750R2W
Panel: LTF400HQ01
T-CON: 2010_R240S_MB4_0.4
Inverter (backlight): SSB400-12V01 REV0.3
Power Supply (PSU): BN44-00340A I40F1_ASM REV 1.2
PWM Power: FAN7530 (PFC), STR-W6052S
MainBoard: BN41-01423B BN94-0388A
IC MainBoard: SIL9389CTU, K4T1G084QF, STA3698WS
Tuner: BN40-00188A
Specifications LE40C750
SAMSUNG LE40C750R2W
General repair guidelines for TV LCD
Possible malfunctions
- SAMSUNG LE40C750R2W 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.
With such manifestations, the BN44-00340A power module usually fails. It is then necessary to measure its output voltages and, if they are absent, you should check the power switches and rectifier diodes of the converters for the probability of a short circuit.
In case of breakdowns in the secondary circuits, the converter can operate in a short circuit mode, and during a short circuit in the 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. These can be circuits supplying the PWM controller, damping or frequency-setting circuits, or elements of OOS (negative feedback) in the stabilization circuit. PWM controllers (PWM) FAN7530 (PFC), STR-W6052S, in the absence of external damage and short circuit between the terminals, are checked by replacing with obviously good ones.
- There is no image, but there is sound, it reacts to the remote control. Or 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. 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 indicator on the front panel blinks, the TV does not turn on in the operating mode, it does not respond to the remote control.
Repair or diagnostics of the BN41-01423B 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). Often, the MB (SSB) card must be replaced in case of complex malfunctions that are difficult to detect. When trying to repair, you should check its elements - SIL9389CTU, K4T1G084QF, STA3698WS and replace failed chips with new ones. Some malfunctions may be due to the use of BGA soldering technologies in modern Main Board. Typically, such defects are detected by local heating of the chip.
If a tuner BN40-00188A 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 supply voltage levels and data exchange pulses with the processor via the I2C bus at the corresponding tuner pins.
Once again, we remind TV users: you should not make attempts to repair it yourself without the appropriate knowledge, experience and the necessary qualifications! Trust the repair to professionals with sufficient experience in the repair of electronic equipment.
BN41-01423B
The appearance of the power supply
Main features of the SAMSUNG LE40C750R2W device:
Installed matrix (LCD panel) LTF400HQ01.
The matrix control uses the Timing Controller (T-CON) 2010_R240S_MB4_0.4.
To power the backlight used inverter SSB400-12V01.
The formation of the necessary supply voltages for all nodes of the SAMSUNG LE40C750R2W TV is carried out by the BN44-00340A power module, or its analogs using FAN7530 (PFC), STR-W6052S microcircuits.
MainBoard - the main board (motherboard) is a BN41-01423B module, using SIL9389CTU, K4T1G084QF, STA3698WS and others.
The tuner BN40-00188A provides the reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: SAMSUNG
Model: LTF400HQ01
Type: a-Si TFT-LCD, Panel
Diagonal size: 40 inch
Resolution: 1920x1080, FHD
Display Mode: S-PVA, Normally Black, Transmissive
Frequency: 240Hz
Lamp Type: WLED