Technical description and composition of the SAMSUNG LE40F86BD TV, panel type and applicable modules. The composition of the modules.SAMSUNG
Model: LE40F86BD
Chassis / Version: GPY40SEN
Panel: LTA400HH-L01
T-CON: 40/46 / 52HHC6LV3.3 BN81-01281A
Inverter (backlight): SSB400HA20V SSB400WA20V
PWM Inverter: LX1691A
MOSFET Inverter: 2SK3568
Power Supply (PSU): BN44-00167C
PWM Power: ICE1PCS02 (PFC), ICE3B0365J, FSDM0565
MOSFET Power: FQA13N50CF (PFC)
MainBoard: BN41-00919B - BN94-01412J
IC MainBoard: CPU: 7568W-LF, SDP64; EM6A9320BI-4MG, Sil9125CTU, M308AOSGP
Tuner: BN40-00096A
Control: IR: BN41-00921A
Technical Specifications LE40F86BD
SAMSUNG LE40F86BD
General repair guidelines for TV LCD
Repair SAMSUNG LE40F86BD must begin with the diagnosis of the malfunction and a thorough inspection of its external and internal elements, including the case. Sometimes, for some visible changes, you can determine the further direction of the defect search and localization of the malfunction before the start of taking the oscillograms and making the necessary measurements at the control points. Swollen electrolytic or cermet capacitors, charred resistors, ring cracks in the soldered terminals of the elements - all this can significantly help the master to determine the causes and consequences of the malfunction of the TV.
Sometimes the SAMSUNG LE40F86BD TV simply does not turn on. No control lights on the front panel are lit or blinking, the TV does not respond to the remote control and does not make any sounds or any signs of life when turned on. The most likely cause of the malfunction is the failure of the BN44-00167C common power module. If the mains fuse is broken in the power supply, in most cases a breakdown of the power switch is detected, which can be integrated with the 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.
It should be remembered that in the practice of repair, usually the power keys of N-Fet converters do not fail due to their poor quality and, in such cases, it is necessary to look for the reason that led to a malfunction and provoked a breakdown of the key. Most often, the culprits of the accident are dried electrolytic capacitors or dangling resistors in the primary circuit, or the PWM controller chip itself may be faulty. It is also necessary to check all the semiconductor elements of the stabilization circuit in the primary and secondary circuits.
It is somewhat more difficult to look for a malfunction in the converter of the power module with an active KKM (power factor corrector).
If the SAMSUNG LE40F86BD does not have an image, but there is sound and the TV is controlled from the remote control, a malfunction in the display backlight nodes is likely. Lamps or power converter - inverter may be faulty. Often in such cases, when you turn on the TV, an image appears and immediately disappears. First of all, it is necessary to verify the operability of the electrolytic capacitors of the rectifier filter supplying the inverter, and check the LCD lamps by connecting external and obviously serviceable for diagnosis to the connectors.
Diagnostics and repair of the inverter are often complicated by the organization of special protection circuits, which is necessary for fire safety and turns off the inverter in any emergency situation, for example, when the lamps are worn or depressurized. Often, to localize a defect, its blocking is required.
In such cases, special care should be taken during diagnosis, and after completion of all repair work, it is necessary to restore the circuit and the inverter protection for further safe operation of the TV.
In cases of attempts to repair the motherboard BN94-01412J, it is necessary to check the operability of the power stabilizers of the microcircuits and, if possible, update the software (software). When repairing an MB board, you must check its components BN94-01448B, BN41-00923A. Defective items should be replaced.
Once again, remind users! Attempts to self-repair a SAMSUNG LE40F86BD TV without the appropriate qualifications and experience can lead to its complete non-repairability!
SCHEMATIC --------> LE40F86BD, LE46F86BD, LE52F96BD, LE70F96BD Chassis GPY40SEN, GPY46SEN, GRZ52SEN, GRZ70SEN.
The appearance of the MainBoard BN41-00919B is shown in the figure below:BN41-00919B
PSU Advanced
The LE40F86BD TV is equipped with a BN44-00167C 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 ICE1PCS02 PWM controller does not allow the input rectifier filter's electrolytic capacitor to be connected to the network directly through open diodes when the charge current determines its reactance (about 15-30 ohms at a frequency of 50 Hz). 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 LE40F86BD device:
Installed matrix (LCD-panel) LTA400HH-L01.
The matrix control uses the Timing Controller (T-CON) 40.
The SSB400HA20V inverter is used to power the backlight, controlled by the LX1691A PWM controller. As power elements of the inverter, keys of the 2SK3568 type are used.
The necessary supply voltages for all nodes of the SAMSUNG LE40F86BD TV are generated by the BN44-00167C power supply module or its analogs using ICE1PCS02 (PFC), ICE3B0365J, FSDM0565 microchips and power switches of the FQA13N50CF (PFC) type.
MainBoard - the main board (motherboard) is a BN41-00919B module using CPU chips: 7568W-LF, SDP64; EM6A9320BI-4MG, Sil9125CTU, M308AOSGP and others.
The tuner BN40-00096A provides the reception of television programs and tuning to channels.
Information from an alternative source:
Samsung LE40F86BD Chassis GPY40SEN
Panel Type (Matrix): LTA400HH-L01,
Motherboard: BN94-01412J,
T-con: 40/46 / 52HHC6LV3.3 BN81-01281A,
Invertor: SSB400HA20V SSB400WA20V, FRCM: BN94-01448B, IR: BN41-00923A, Power Switch: BN41-00921A,
PSU: BN44-00167C Service Manual
Additional technical information about the panel:
Brand: SAMSUNG
Model: LTA400HH-L01
Type: a-Si TFT-LCD, Panel
Diagonal size: 40 inch
Resolution: 1920x1080, FHD
Display Mode: S-PVA, Normally Black, Transmissive
Display Colors:, CIE1931 72%
Frequency: 120Hz