Technical description and composition of the SAMSUNG LE40A451C1 TV, panel type and applicable modules. The composition of the modules.
SAMSUNG
Model: LE40A451C1
Chassis / Version: N55B / N56B
Panel: T400XW01 V.6
Inverter (backlight): integrated into PSU
Power Supply (PSU): BN44-00197B
PWM Power: ICE2QS01, ICE2PCS02G (PFC), LX1692A
MainBoard: BN41-00982A BN94-01673D
IC MainBoard: CPU: SAMS01; DRAM: EM6A9160TSOA-5G; SPI Flash: MX25L1605AM2I-12G; EEPROM: 24C256;
Tuner: BN40-00099A
Technical specifications LE40A451C1
SAMSUNG LE40A451C1
General repair guidelines for TV LCD
Possible malfunctions
- SAMSUNG LE40A451C1 does not turn on. There are no signs of operability. The indicators on the front panel do not light or flash, the TV does not respond to the remote control and control buttons.
With such manifestations, a malfunction is most likely to be detected in the BN44-00197B power supply module. In the absence of the necessary supply voltages in the secondary circuits of the converters, it is necessary to check the power switches and rectifier diodes for a possible partial or complete breakdown.
In case of any breakdowns in the secondary circuits, the converter can operate in emergency short circuit mode, and during short circuit in the power elements of the primary circuit, the mains fuse or the current sensor at the source of the key more often breaks.
The breakdown of Mos-Fet keys used in pulsed sources is often caused by malfunctions of other elements, for example, in the power supply circuit of a PWM controller, in frequency-setting or damping circuits, as well as in Negative Stabilization Feedback. PWM circuits ICE2QS01, ICE2PCS02G (PFC), LX1692A are usually checked by replacing with new ones, or obviously working.
- There is no image, there is sound, there is a reaction to the remote control. Or immediately after turning on for a second, the image may appear and immediately disappear.
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, does not respond to the remote control. The indicator blinks or signals standby mode.
Repair or diagnostics of the BN41-00982A 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 attempts to repair the MB board (SSB), it is necessary to check the health of its elements - CPU: SAMS01; DRAM: EM6A9160TSOA-5G; SPI Flash: MX25L1605AM2I-12G; EEPROM: 24C256; which may require replacement with new ones. If a BGA processor is installed, there is a possibility of a violation of the soldering of the contacts of its conclusions with the board (it is diagnosed by heating).
Before changing the tuner BN40-00099A, if there is no possibility of tuning to television channels, you should make sure that there are supply voltages that must be measured at the corresponding terminals of the tuner and check the software for correctness. The pulses of the data exchange of the tuner with the processor can be controlled by an oscilloscope
Once again, remind users! Attempts to self-repair a SAMSUNG LE40A451C1 TV without the appropriate qualifications and the necessary experience can lead to its complete non-repairability!
Service manual and schematic diagram -------> SAMSUNG LE40A451C1 Chassis N55B/N56B.
The appearance of the MainBoard BN41-00982A is shown in the figure below:BN41-00982A
BN41-00982A can be used in TVs:
SAMSUNG LE32A330J1 (Panel V315B1-L01 REV.C4 C5), SAMSUNG LE37A430T1 (Panel T370XW02 VC), SAMSUNG LE40A330J1 (Panel T400XW01 V.5), SAMSUNG 37A330J1 (Panel T370XW02 VG01, SAM30, V30, TGV40, SAM30, TGV4, VG, V30, VG, VG, V30, VG, V30) LE26A330J1 LE26A330 (Panel V260B1-L13).
The appearance of the power supply
Main features of the SAMSUNG LE40A451C1 device:
Installed matrix (LCD panel) T400XW01 V.6.
To power the backlight, a converter is used, combined with the power supply.
The necessary supply voltages for all nodes of the SAMSUNG LE40A451C1 TV are generated by the power module BN44-00197B, or its analogs using ICE2QS01, ICE2PCS02G (PFC), LX1692A microcircuits.
MainBoard - the main board (motherboard) is a BN41-00982A module, using CPU chips: SAMS01; DRAM: EM6A9160TSOA-5G; SPI Flash: MX25L1605AM2I-12G; EEPROM: 24C256; and others.
The tuner BN40-00099A provides the reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: AUO
Model: T400XW01 V6
Type: a-Si TFT-LCD, Panel
Diagonal size: 40 inch
Resolution: 1366x768, WXGA
Display Mode: AMVA, Normally Black, Transmissive
Active Area: 885.168x497.664 mm
Surface: Antiglare (Haze 11%), Hard coating (3H)
Brightness: 450 cd / m²
Contrast Ratio: 2000: 1
Display Colors: 16.7M (8-bit), CIE1931 72%
Response Time: 8 (G to G)
Frequency: 60Hz
Lamp Type: 10 pcs CCFL Without Driver
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 12.0V