Technical description and composition of the SAMSUNG LT23B350 TV, panel type and applicable modules. The composition of the modules.SAMSUNG LED
Model: LT23B350 LT23B350EWH / CI
Chassis / Version: SP01
Panel: LTM230HT10
LED driver (backlight): integrated into PSU
PWM LED driver: MAP3204C
Power Supply (PSU): BN44-00504A PD23A0T_CPN
PWM Power: ICE3BR1065JF
MainBoard: BN41-01879A BN94-05918Q
IC MainBoard: SEMS23, W25Q40
Tuner: DT0D40FVL084AA BN40-00232A
Appearance
SAMSUNG LT23B350
General repair guidelines for TV LCD LED
Possible manifestations of defects
- The SAMSUNG LT23B350 TV does not turn on and does not show any signs of turning on, it does not respond to the control buttons and the remote control.
With such manifestations, a malfunction is most likely to be detected in the power source - the BN44-00504A module. First of all, you should check the operation of the standby power converter (PWM ICE3BR1065JF).
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 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 keys used in switching power supplies usually fail due to a malfunction of other elements that can put it out of operation in key mode or provoke an excess of the maximum current or voltage. It can be supply, damper circuits, or elements of OOS (negative feedback) stabilization.
- There is no image, but there is sound and reaction to commands from the remote control. Or the image appears immediately after turning on and disappears.
Usually in such cases, a malfunction is detected in the backlight nodes of the LED panel. The reason for this may be a break in the LED circuit, or a problem in stabilizing their power supply.
To check the health in the LED circuit, it is better to use a current source with a maximum voltage of 200V. We do not recommend using any voltage sources for this purpose. You can test each LED individually with a simple Chinese multimeter (powered by 9 volts) in the P-N-junction test mode. If you connect the red probe of the multimeter to the anode of the LED, and the black to its cathode, then the 3-volt LED will light up slightly, and in the opposite direction you can detect the transition of the emergency zener diode. A zener diode PN junction indirectly indicates a LED-a
- 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 BN41-01879A 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). Sophisticated MB board repair (SSB) is in some cases possible and practiced by repairmen. To do this, check and, if necessary, replace the elements SEMS23, W25Q40. BGA chip malfunctions are usually easy to detect by warming up.
Before replacing the DT0D40FVL084AA BN40-00232A tuner, if there is no tuning for the channels, you must first check the software and the supply voltage at its terminals. It is also necessary to make sure that the tuner and processor can exchange data via the I2C bus
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 BN41-01879A is shown in the figure below:BN41-01879A
The appearance of the power supply
Main features of the SAMSUNG LT23B350 device:
Installed matrix (LED-panel) LTM230HT10.
To power the backlight LEDs, a converter is used, combined with a power supply, controlled by the MAP3204C PWM controller.
The necessary supply voltages for all nodes of the SAMSUNG LT23B350 TV are generated by the power module BN44-00504A, or its analogs using ICE3BR1065JF microcircuits.
MainBoard - the main board (motherboard) is a module BN41-01879A, using microchips SEMS23, W25Q40 and others.
The tuner DT0D40FVL084AA BN40-00232A provides the reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: SAMSUNG
Model: LTM230HT10
Type: a-Si TFT-LCD, Panel
Diagonal size: 23.0 inch
Resolution: 1920x1080, FHD
Display Mode: TN, Normally White, Transmissive
Active Area: 509.76x286.74 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: 11S3P WLED Without Driver
Signal Interface: LVDS (2 ch, 8-bit), 30 pins
Voltage: 5.0V