Technical description and composition of the SAMSUNG LW20M11C TV, panel type and applicable modules. The composition of the modules.SAMSUNG
Model: LW20M11C
Chassis / Version: MU20EO
Panel: V201V1-T01 REV.C2
Inverter (backlight): BN44-00097B IV80174 / T
PWM Inverter: OZ960
MOSFET Inverter: FSS234
Power Supply (PSU): BN94-00443C
PWM Power: NCP1200P60
MainBoard: BN41-00358A BN91-00769D
IC MainBoard: STL10, SDA5550, M27W401, K4S643232H-TC60
Tuner: BN40-00043A
Technical Specifications LW20M11C
SAMSUNG LW20M11C
General repair guidelines for TV LCD
Possible malfunctions
- SAMSUNG LW20M11C TV does not turn on, does not respond to the remote control and control panel buttons, indicators do not light up and do not blink.
Failure in such cases should begin to be sought in the BN94-00443C power supply circuits. It is necessary to verify the presence of its output voltages and, if they are completely absent, check the power switches and rectifier diodes for a probable short circuit.
In case of any breakdown of semiconductors in the secondary circuits, the converter can usually work normally in emergency short circuit mode. There are no output voltages. And during short circuit in the power elements of the primary circuit, as a rule, the mains fuse breaks and less often the current sensor at the source of the key.
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), in the absence of external damage and a short circuit between the terminals, are checked by replacing with obviously good ones.
- There is no image, the screen is black, there is sound, with external illumination of the screen, you can sometimes see barely noticeable outlines of the image.
These manifestations can be triggered by a power supply module, or by inverter defects, as well as 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 working, then you need to check the converter keys and 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 TV does not enter the operating mode, does not respond to the remote control. The indicator on the front panel lights up constantly or blinks.
Repair or diagnostics of the BN41-00358A 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 STL10, SDA5550, M27W401, K4S643232H-TC60. BGA chip malfunctions are usually easy to detect by warming up.
If you suspect a malfunction of the BN40-00043A tuner, first of all, you need to verify the correctness of the software, as well as the presence of the necessary voltage levels and pulses of data exchange with the processor via the I2C bus at the corresponding terminals of the tuner.
Attention TV owners! Self-repair attempts by SAMSUNG LW20M11C are not recommended by the manufacturer and can lead to serious negative consequences!
FIRMWARE M27W401 -----------> SAMSUNG LW20M11C, Main: BN41-00358A BN91-00769D, Panel: V201V1-T01 REV.C2.
Service manual and schematic diagram -----------> SAMSUNG LW20M11C Chassis MU20EO.
The appearance of the MainBoard BN41-00358A is shown in the figure below:BN41-00358A
Main features of the SAMSUNG LW20M11C device:
Installed matrix (LCD panel) V201V1-T01 REV.C2.
To power the backlight, an inverter BN44-00097B is used, controlled by the OZ960 PWM controller. As power elements of the inverter, keys of the FSS234 type are used.
The formation of the necessary supply voltages for all nodes of the SAMSUNG LW20M11C TV is carried out by the BN94-00443C power module, or its analogs using NCP1200P60 microcircuits.
MainBoard - the main board (motherboard) is a BN41-00358A module, using microchips STL10, SDA5550, M27W401, K4S643232H-TC60 and others.
The tuner BN40-00043A provides the reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: CMO
Model: V201V1-T01
Type: a-Si TFT-LCD, Panel
Diagonal size: 20.1 inch
Resolution: 640x480, VGA
Display Mode: TN, Normally White, Transmissive
Active Area: 408x306 mm
Surface: Antiglare, Antireflection
Brightness: 500 cd / m²
Contrast Ratio: 500: 1
Display Colors: 16.7M (8-bit), CIE1931 75%
Response Time: 5/11 (Tr / Td)
Frequency: 60Hz
Lamp Type: 6 pcs CCFL Without Driver
Signal Interface: TTL (1 ch, 8-bit), 50 pins
Voltage: 5.0V (VCC)