Technical description and composition of the SAMSUNG LE19B451C4W TV, panel type and applicable modules. The composition of the modules.SAMSUNG
Model: LE19B451C4W
Chassis / Version: N65B
Panel: CLAA185WA03
Lamp backlight: 2 Lamp CCFL
Inverter (backlight): integrated into PSU
PWM Inverter: FAN7320B
Power Supply (PSU): BN44-00231B PW11902ST (A) NBNC1 Rev1.2
PWM Power: Q0465R
MainBoard: BN41-01171C SATURN4 DTV_650
IC MainBoard: SEMS12, MX25L6405D, AT24C1024B, K4T51163QG-HCE7
Tuner: BN40-00137A DNOQ403SH151A (S)
Technical Specifications LE19B451C4W
SAMSUNG LE19B451C4W
General repair guidelines for TV LCD
Possible malfunctions
- SAMSUNG LE19B451C4W does not turn on, the indicators on the front panel do not light or flash. The TV does not respond to the control buttons and the remote control.
With such manifestations, in some cases, the BN44-00231B power module is faulty. It is necessary to measure its secondary output voltages, and if they are absent, check the power switches and rectifier diodes in the converters for a short circuit.
In case of breakdowns of semiconductors in the secondary circuits of any converter, as a rule, it can operate in emergency short-circuit mode without output voltages, and during short circuit in the elements of the primary circuit, the mains fuse and, less often, the current sensor at the source of the key are most often cut off.
Mos-Fet power switches, used in switching power supplies, sometimes fail due to a malfunction of any other elements that can put it out of operation in key mode or create an excess of the maximum permissible parameters of the switch. These can be elements supplying the PWM controller, frequency-setting or damping circuits, or negative feedback elements in the stabilization circuit. PWM controllers Q0465R, in the absence of visible damage or open faults between the terminals, are 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.
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. If all the electrolytic capacitors of the filter according to the inverter power supply are serviceable, you should make sure that the lamps are in good working condition, then you need to check the converter keys and the secondary windings of the transformers.
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 blinks or glows constantly, the TV does not turn on, does not respond to the remote control.
Repair or diagnostics of the BN41-01171C 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). Sometimes they require checking or replacing (if necessary) the elements of the MainBoard board - MX25L6405D, AT24C1024B, K4T51163QG-HCE7. In cases where the BGA processor is used, its malfunction is usually detected by local heating.
If a tuner BN40-00137A DNOQ403SH151A (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 supply voltage levels and data exchange pulses with the processor via the I2C bus at the corresponding tuner pins.
Attention TV owners! Attempts to self-repair SAMSUNG LE19B451C4W are not recommended by the manufacturer and can lead to serious negative consequences!
The appearance of the MainBoard BN41-01171C is shown in the figure below:BN41-01171C
BN41-01171C can be used in TVs:
SAMSUNG LE19B450C4W (Panel LTM185AT01), SAMSUNG LE19B451C4W (Panel CLAA185WA03).
The appearance of the power supply
Main features of the SAMSUNG LE19B451C4W device:
Installed matrix (LCD panel) CLAA185WA03.
To power the backlight, a converter is used, combined with a power supply, controlled by a FAN7320B PWM controller.
The formation of the necessary supply voltages for all nodes of the SAMSUNG LE19B451C4W TV is carried out by the BN44-00231B power module, or its analogs using Q0465R microcircuits.
MainBoard - the main board (motherboard) is a BN41-01171C module, using chips SEMS12, MX25L6405D, AT24C1024B, K4T51163QG-HCE7 and others.
The tuner BN40-00137A DNOQ403SH151A (S) provides the reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: CPT
Model: CLAA185WA03
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, 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