Technical description and composition of the SAMSUNG LE40C650L1W TV, panel type and applicable modules. The composition of the modules.SAMSUNG
Model: LE40C650L1W
Chassis / Version: N84A
Panel: LTF400HF15 CHINA
T-CON: S120APM4C4LV0.4
Inverter (backlight): SSB400 12V01 Rev0.3 + BN44-00340A
PWM Inverter: LX6503
Power Supply (PSU): BN44-00340A
PWM Power: FAN7530 (PFC), STR-W6052S
MainBoard: BN41-01443C
Tuner: BN40-00176A DNSS24CVL161A
Technical specifications LE40C650
SAMSUNG LE40C650L1W
General repair guidelines for TV LCD
Repair SAMSUNG LE40C650L1W must begin with the diagnosis of the malfunction and a thorough inspection of its external and internal elements, including the case. In some cases, visible external damage to the elements can suggest the direction of troubleshooting and localization of the defect before starting the necessary measurements at the control points of the nodes of electronic circuits. Carbonized paint on the upper layer of resistors, electrolytic capacitors of rectifier filters deformed after boiling, cracked soldering at the terminals of the elements can often tell the cause of the defect and possible consequences.
If the SAMSUNG LE40C650L1W does not turn on, no control lights on the front panel light up or blink, therefore, there is a very high probability of a power module malfunction. It is advisable to start the troubleshooting of the power supply module by checking the mains fuse. If it is broken, it is necessary to check first of all the power semiconductor elements - rectifier diodes and the power switch of the converter, which are often found in breakdown conditions in such situations.
The reasons for the breakdown of the power switch of the flyback converter of the power module can be different, for example, a malfunction of semiconductor cells or electrolytic capacitors in the stabilization circuits of the primary circuit, as well as a failure in the operation of the PWM controller chip or breakage of the resistors in its bundle.
If the power module uses an active KKM circuit (power factor control), troubleshooting is somewhat more complicated.
If the SAMSUNG LE40C650L1W 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.
Repair of the inverter can often be somewhat complicated by the use of special protection circuits, which are designed to disconnect it in emergency cases for fire safety during depressurization of lamps, or short circuits or breaks in high-voltage circuits and connections. Sometimes it becomes necessary for diagnostic purposes to block the protection circuits in order to be able to make the necessary measurements at the control points of the circuit.
In these cases, special care must be taken in view of the risk of failure of the power elements. After completing all repair work, it is imperative to restore the protection circuits for full and safe further operation of the TV by the user.
Once again, remind users! Attempts to self-repair a TV SAMSUNG LE40C650L1W without the appropriate qualifications and experience can lead to its complete non-repairability!
SCHEMATICS-----------> Chassis N84A.
FOR MODELS----------->: LE32C63*, LE37C63*, LE40C63*, LE46C63*, LE32C65*, LE37C65*, LE40C65*, LE46C65*, LE55C65*, LE32C67*, LE37C67*, LE40C67*, LE46C67*, LE55C67*.
The appearance of the MainBoard BN41-01443C is shown in the figure below:BN41-01443C
BN41-01443C can be used in TVs:
SAMSUNG LE40C650L1W (Panel LTF400HF15 CHINA), SAMSUNG LE32C650L1W LE32C650 (Panel LTF320HF01), SAMSUNG LE46C650 LE46C650L1W (Panel T460HW03 VK).
PSU Advanced
The LE40C650L1W TV is equipped with a BN44-00340A 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 FAN7530 PWM controller does not allow the electrolytic capacitor of the input rectifier filter to be connected directly to the network directly through open diodes, when the value of 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 LE40C650L1W device:
Installed matrix (LCD-panel) LTF400HF15 CHINA.
The matrix control uses the Timing Controller (T-CON) S120APM4C4LV0.4.
To power the backlight, an SSB400 inverter is used, it is controlled by the LX6503 PWM controller.
The formation of the necessary supply voltages for all nodes of the SAMSUNG LE40C650L1W 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 BN41-01443C module.
The tuner BN40-00176A DNSS24CVL161A provides the reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: SAMSUNG
Model: LTF400HF15-A01
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: Glare (Haze 0%), Hard coating (2H)
Brightness: 500 cd / m²
Contrast Ratio: 6000: 1
Display Colors: 1.07B (8-bit + Dithering), CIE1931 72%
Response Time: 15/6 (Tr / Td); 6 (G to G)
Frequency: 120Hz
Lamp Type: 12 pcs CCFL Embedded (Balance board)
Signal Interface: LVDS (4 ch, 10-bit)
Voltage: 12.0V