Technical description and composition of the SAMSUNG LW20M21CPX TV, panel type and applicable modules. The composition of the modules.SAMSUNG
Model: LW20M21CPX LW20M21BWT
Chassis / Version: VE20E
Panel: HT201V01-101
T-CON: HT201V01-100-X0.3
Inverter (backlight): integrated into PSU
PWM Inverter: MP1048EM
MOSFET Inverter: AP4501
Power Supply (PSU): IP-51135T (V)
PWM Power: DM07652R
MainBoard: BN41-00641A
IC MainBoard: TDA15021H / N1B80, AT24C16AN, TDA7266D, TSU396QWJ A6MC108999H, TDA7050, FAN7311, MP1410ES
Tuner: BN40-00077A
Control: BN59-00437A
Appearance
SAMSUNG LW20M21CPX
General repair guidelines for TV LCD
Possible manifestations of defects
- SAMSUNG LW20M21CPX does not turn on at all and does not show any signs of operability. Does not blink indicators and does not respond to control buttons.
With such manifestations, the IP-51135T power supply module sometimes fails. In this case, it is necessary to measure its output voltages and, if they are absent, you should check the power switches and rectifier diodes of the converter for a short circuit probability.
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.
The key in the assembly DM07652R may be in a breakdown due to a malfunction of other elements that can put it out of operation in the 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. The PWM controller itself (PWM) DM07652R, if there is no short circuit between the terminals, is checked by replacing it with a known-good one.
- There is no image, but there is sound, it reacts to the remote control. Or the image appears when you turn on and immediately disappears
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 indicator blinks or glows constantly, the TV does not turn on, does not respond to the remote control.
Repair or diagnostics of the BN41-00641A 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). In some cases, to repair the MB (SSB) board, it may be necessary to replace the chips - TDA15021H / N1B80, AT24C16AN, TDA7266D, TSU396QWJ A6MC108999H, TDA7050, FAN7311, MP1410ES with new or obviously working ones. In cases where BGA technologies are used, defects are usually localized by the heating method.
If the TV works normally from external devices, but does not tune into television channels, the tuner BN40-00077A 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.
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 BN41-00641A is shown in the figure below:BN41-00641A
BN41-00641A can be used in TVs:
SAMSUNG LE15S51BP LE15S51 (Panel 15 inches 1024x768), SAMSUNG LW15M23CP (Panel 15 inches 1024x768), SAMSUNG LW20M21CPX LW20M21BWT (Panel HT201V01-101).
The appearance of the power supply
Main features of the SAMSUNG LW20M21CPX device:
Installed matrix (LCD panel) HT201V01-101.
The matrix control uses the Timing Controller (T-CON) HT201V01-100-X0.3.
To power the backlight, a converter is used, combined with a power supply, controlled by the MP1048EM PWM controller. As power elements of the inverter, keys of type AP4501 are used.
The formation of the necessary supply voltages for all nodes of the SAMSUNG LW20M21CPX TV is carried out by the IP-51135T power module, or its analogs using DM07652R microcircuits.
MainBoard - the main board (motherboard) is a BN41-00641A module, using TDA15021H / N1B80, AT24C16AN, TDA7266D, TSU396QWJ A6MC108999H, TDA7050, FAN7311, MP1410ES chips, and others.
The tuner BN40-00077A provides the reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: BOE
Model: HT201V01-101
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 (Haze 25%), Hard coating (3H)
Brightness: 500 cd / m²
Contrast Ratio: 700: 1
Display Colors: 16.7M (8-bit)
Response Time: 3/5 (Tr / Td)
Frequency: 60Hz
Lamp Type: 6 pcs CCFL Without Driver
Signal Interface: TTL (1 ch, 8-bit), 50 pins
Voltage: 5.0V