Technical description and composition of the SAMSUNG LW15M13C TV, panel type and applicable modules. The composition of the modules.SAMSUNG
Model: LW15M13C LW15M13
Chassis / Version: MU15EO
Panel: LTM150XH-L06
Lamp backlight: 4 Lamp CCFL
Inverter (backlight): integrated into PSU
PWM Inverter: BIT3105
MOSFET Inverter: 4543M
Power Supply (PSU): BN44-00100A IP-43135T
PWM Power: TOP246
MainBoard: BN41-00400B BN91-00710C
IC MainBoard: SDA5550M, VPC3230D-C5, MSP3420G, TDA7050T
Tuner: BN40-00043A
Technical Specifications LW15M13C
SAMSUNG LW15M13C
General repair guidelines for TV LCD
Possible malfunctions
- The SAMSUNG LW15M13C TV does not turn on and does not show any signs of turning on, it does not respond to the control buttons or the remote control.
In some of these cases, a fault is detected in the BN44-00100A power supply module. Then it is necessary to measure its output voltages and, in case of their complete or partial absence, it is necessary to check the serviceability of power switches and rectifier diodes of the converters for the presence of a possible short circuit.
In case of breakdowns of semiconductors in the secondary circuits, the converter can usually work abnormally in the short circuit mode, and during short circuit in the power elements of the primary circuit, the mains fuse often breaks.
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. These can be circuits supplying the PWM controller, damping or frequency-setting circuits, or elements of OOS (negative feedback) in the stabilization circuit. PWM controllers (PWM) TOP246, in the absence of external damage and short circuit between the terminals, are checked by replacing with obviously good ones.
- 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.
The 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, you must ring in its converter power keys for breakdown and 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 blinks or glows constantly, the TV does not turn on, does not respond to the remote control.
Repair or diagnostics of the BN41-00400B 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). Complex repair of MB (SSB) is possible only in the conditions of a service center with the necessary equipment. Testing or replacing elements SDA5550M, VPC3230D-C5, MSP3420G, TDA7050T requires the necessary training and professional skills in repairing modules at the component level. Problems associated with the use of BGA soldering technologies can sometimes be diagnosed by warming up.
If the TV works normally from external devices, but does not tune into television channels, the tuner BN40-00043A may be malfunctioning. In such cases, first of all, you should make sure that there are supply voltages at its corresponding terminals. It is also necessary to make sure that the tuner and processor can exchange data via the I2C bus. Sometimes the cause of the inoperability of the tuner may be a software failure.
It should be remembered! Attempts to self-repair a SAMSUNG LW15M13C TV, in the absence of the necessary qualifications and experience, are categorically not recommended and are fraught with negative consequences, up to the complete non-repairability of the device!
Service manual and schematic diagram ------------> SAMSUNG LW15M13C Chassis MU15EO.
PSU SCHEMATIC Samsung -------> BN44-00100A Power supply.
The appearance of the MainBoard BN41-00400B is shown in the figure below:BN41-00400B
The appearance of the power supply
Main features of the SAMSUNG LW15M13C device:
Installed matrix (LCD panel) LTM150XH-L06.
To power the backlight, a converter is used, combined with the power supply, controlled by a BIT3105 PWM controller. As power elements of the inverter, keys of type 4543M are used.
The necessary supply voltages for all nodes of the SAMSUNG LW15M13C TV are generated by the BN44-00100A power module, or its analogs using TOP246 microcircuits.
MainBoard - the main board (motherboard) is a BN41-00400B module, using microchips SDA5550M, VPC3230D-C5, MSP3420G, TDA7050T and others.
The tuner BN40-00043A provides the reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: SAMSUNG
Model: LTM150XH-L06
Type: a-Si TFT-LCD, Panel
Diagonal size: 15.0 inch
Resolution: 1024x768, XGA
Display Mode: TN, Normally White, Transmissive
Active Area: 304.1x228.1 mm
Surface: Antiglare (Haze 25%), Hard coating (3H)
Brightness: 400 cd / m²
Contrast Ratio: 400: 1
Display Colors: 16.2M (6-bit + FRC)
Response Time: 5/20 (Tr / Td)
Frequency: 60Hz
Lamp Type: 4 pcs CCFL Without Driver
Signal Interface: LVDS (1 ch, 8-bit), 20 pins
Voltage: 3.3V