Technical description and composition of the SAMSUNG LE19B450C4W TV, panel type and applicable modules. The composition of the modules.SAMSUNG
Model: LE19B450C4W
Chassis / Version: N65B SATURN4
Panel: LTM185AT01
Inverter (backlight): with integrated PSU
PWM Inverter: FAN7320
Power Supply (PSU): BN44-00231B
PWM Power: Q0465R
MainBoard: BN41-01171A // BN41-01171C BN94-03131Q
IC MainBoard: SEMS12-LF, WT61P8, SPI Flash: 25L64050MI-12G, EEPROM: 24C1024, DRAM: K4T51163QG
Tuner: BN40-00137A DN0Q403SH151A (S)
Control: BN59-00942A
Specifications LE19B450
SAMSUNG LE19B450C4W
General repair guidelines for TV LCD
Possible malfunctions
- SAMSUNG LE19B450C4W TV does not turn on at all. There is no reaction to the remote control or to the control buttons from the front panel. Indicator lights do not light or flash.
In most of these cases, a fault can be detected in the BN44-00231B power module. It is necessary to measure its output voltages and, if they are absent, to check the serviceability of power switches and rectifier diodes in the converters for possible breakdown.
In case of breakdowns in the secondary circuits, the converter can emergencyly operate in the short circuit mode, and during short circuit in the power elements of the primary circuit, the mains fuse usually breaks.
A breakdown of the key in the Q0465R chip is often caused by malfunctions of other elements, for example, power supply, frequency setting, damper, as well as elements of the Negative Stabilization Feedback.
The PWM chip Q0465R itself is checked by replacing it with a known good one.
- There is no image, there is sound, it responds to the remote control. 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 a 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 powering the inverter, you should ring in its converter power keys for breakdown and the secondary windings of transformers for an open.
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 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 BN41-01171A 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 - SEMS12-LF, WT61P8, SPI Flash: 25L64050MI-12G, EEPROM: 24C1024, DRAM: K4T51163QG and replace the 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 BN40-00137A DN0Q403SH151A (S) 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 power 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.
The appearance of the MainBoard BN41-01171A is shown in the figure below:BN41-01171A
The appearance of the power supply
Main features of the SAMSUNG LE19B450C4W device:
Installed matrix (LCD panel) LTM185AT01.
To power the backlight, a converter is used, combined with a power supply, controlled by a FAN7320 PWM controller.
The formation of the necessary supply voltages for all nodes of the SAMSUNG LE19B450C4W TV is carried out by the BN44-00231B power module, or its analogs using Q0465R microcircuits.
MainBoard - the main board (motherboard) is a BN41-01171A module, using chips SEMS12-LF, WT61P8, SPI Flash: 25L64050MI-12G, EEPROM: 24C1024, DRAM: K4T51163QG and others.
The tuner BN40-00137A DN0Q403SH151A (S) provides the reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: SAMSUNG
Model: LTM185AT01
Type: a-Si TFT-LCD, Panel
Diagonal size: 18.5 inch
Resolution: 1366x768, WXGA
Display Mode: TN, Normally White, Transmissive
Active Area: 409.8x230.4 mm
Surface: Antiglare (Haze 25%), Hard coating (3H)
Brightness: 250 cd / m²
Contrast Ratio: 1000: 1
Display Colors: 16.7M (6-bit + Hi-FRC), CIE1931 72%
Response Time: 5 (Tr + Td)
Frequency: 60Hz
Lamp Type: 2 pcs CCFL Without Driver
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 5.0V