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Samsung LT20A350 - User Manual

Samsung LT20A350
76 pages
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SERVICE
Manual
TFT-LCD TV Monitor Contents
1. Precautions
2. Product specications
3. Disassembly and Reassembly
4. Troubleshooting
5. Wiring Diagram
LCD TV Monitor
TA350 / TA550
Chassis :
Model :
WDS2
LT20A350
LT22A350
LT23A350
LT24A350
WDS4
LT22A550
LT23A550
LT24A550
LT27A550

Questions and Answers

  • L
    Linda TurnerAug 6, 2025
    Why won't my Anynet+ device play on my Samsung LT20A350?
    • N
      nelsoncherylAug 6, 2025
      The play function cannot be used on your Samsung Monitor when Plug & Play (initial setup) is in progress.
  • A
    Angela AndersonAug 11, 2025
    How to fix Anynet+ not working on my Samsung LT20A350?
    • T
      tfordAug 11, 2025
      If Anynet+ is not working on your Samsung Monitor, first ensure the device you are trying to connect is an Anynet+ compatible device, as the system only supports these devices. Check that only one receiver (home theatre) is connected. Verify the Anynet+ device's power cord, Video/Audio/HDMI cable connections are properly connected. Also, make sure Anynet+ (HDMI-CEC) is turned On in the System menu and that the TV remote control is in TV mode and is Anynet+ compatible. Note that Anynet+ may not function during certain operations like searching channels, using My Downloads, or during Plug & Play (initial setup). If you connect or disconnect the HDMI cable, search for devices again or power cycle your TV. Finally, ensure the Anynet+ Function of the Anynet+ device is enabled.
  • J
    Jessica ChavezAug 16, 2025
    Why is the connected device not displayed on my Samsung LT20A350 Monitor?
    • J
      Jeffrey KellyAug 16, 2025
      If your Samsung Monitor doesn't display a connected device, verify that the device supports Anynet+ functions. Also, ensure the HDMI cable is properly connected and that Anynet+ (HDMI-CEC) is enabled in the System menu. Try rescanning for Anynet+ devices. Note that only HDMI cables can be used to connect Anynet+ devices, but some HDMI cables may not support Anynet+ functions. If the connection was interrupted due to a disconnected HDMI cable, power cord, or power failure, repeat the device scan.
  • M
    Maria RossAug 20, 2025
    How to start Anynet+ on Samsung Monitor?
    • J
      Jonathan BirdAug 20, 2025
      To start Anynet+ on your Samsung Monitor, ensure the Anynet+ device is correctly connected to the TV and that Anynet+ (HDMI-CEC) is set to On in the System menu. Then, press the TOOLS button to bring up the Anynet+ menu and choose the desired option.
  • L
    Laura CollinsAug 25, 2025
    How to exit Anynet+ on Samsung LT20A350 Monitor?
    • K
      Kevin BrownAug 26, 2025
      To exit Anynet+ on your Samsung Monitor, select View TV in the Anynet+ menu. Alternatively, press the SOURCE button on the TV remote and select a device other than an Anynet+ device. You can also press < CH >, CH LIST, PRE-CH, and FAV.CH to switch to TV mode.
  • C
    cole99Aug 31, 2025
    What to do if the message 'Connecting to Anynet+ device...' appears on the Samsung LT20A350?
    • K
      Kimberly FranklinAug 31, 2025
      If the message "Connecting to Anynet+ device..." appears on your Samsung Monitor, you won't be able to use the remote control while Anynet+ is configuring or switching view modes. Wait until the Anynet+ setting or view mode switch is complete before using the remote.

Summary

Precautions

Safety Precautions

Essential safety guidelines for servicing, handling, and general use to prevent hazards.

Servicing the Monitor

Precautions for technicians, including disconnecting power and using proper testing equipment.

Fire and Shock Hazard

Checks to perform before returning the unit, focusing on preventing electrical shock and fire.

Product Safety Notices

Notes on special safety characteristics of parts and potential hazards from incorrect replacements.

Servicing Precautions

Guidelines for safe and correct procedures during monitor servicing to prevent damage.

Electrostatically Sensitive Devices (ESD) Precautions

Methods to prevent damage to sensitive electronic components from static electricity.

Installation Precautions

Safety measures and guidelines for correctly installing the monitor to prevent hazards.

Product Specifications

Feature & Specifications

Detailed features and technical specifications for the LCD TV Monitor models.

Detail Factory Option

Information on factory options and settings required when replacing main boards.

LT20 A350; LT22 A350; LT23 A350; LT24 A350

Specific factory option codes for panel, SMPS, and other components for certain models.

LT22 A550; LT23 A550; LT24 A550; LT27 A550

Specific factory option codes for panel, SMPS, and other components for other models.

Accessories

List of included accessories with their respective model numbers and descriptions.

New Features Explanation

Explanation of advanced features like Anynet+ and My Contents.

Anynet+

Details on the Anynet+ function for controlling multiple Samsung devices with one remote.

My Contents

Guide on using the My Contents feature to play media files from USB devices.

Disassembly and Reassembly

Disassembly and Reassembly

Step-by-step instructions and cautions for safely disassembling and reassembling the monitor.

Troubleshooting

Troubleshooting

General troubleshooting steps and initial checks before diagnosing issues.

Previous check

Initial checks including cable connections and power input to the main board.

No Power

Diagnostic procedures and solutions for issues where the monitor does not power on.

No Video (Analog PC signal)

Troubleshooting steps for no video output when using an analog PC signal.

No video (HDMI 1, 2, 3, 4 - Digital signal)

Diagnostic guide for no video output from HDMI inputs.

No Video (Tuner_CVBS)

Troubleshooting steps for no video when using the Tuner with CVBS signal.

No Video (Tuner DTV)

Diagnostic procedures for no video output from the Tuner's DTV signal.

No Video (Video CVBS)

Troubleshooting steps for no video when using the Video CVBS input.

No Video (Component)

Diagnostic guide for no video output from Component inputs.

No Sound

Troubleshooting steps for issues where video is present but there is no sound.

Alignments and Adjustments

Basic instructions and precautions for performing monitor alignments and adjustments.

General Alignment Instruction

Basic guidelines for color monitor adjustments upon installation and general alignment procedures.

Factory Mode Adjustments

Procedures for entering the service or factory mode for advanced adjustments.

Entering Factory Mode

Procedures for entering the service or factory mode using the remote control.

How to Access Service Mode

Step-by-step guide on accessing the service mode for advanced adjustments.

Factory Data

Details on factory data settings, including panel type, tuner, and color options.

White Balance - Calibration

Overview of the calibration process for AV, Component, PC, and HDMI inputs.

White Balance -Calibration

Overview of the calibration process for AV, Component, PC, and HDMI inputs.

White Balance - Adjustment

Specific adjustments for white balance (W/B) under low and high light conditions.

White Ratio (Balance) Adjustment

Procedure for adjusting white ratio in factory mode, including optimal values for different modes.

Servicing Information

Information related to servicing procedures and firmware updates.

USB Download Method (Main SW & e-Manual)

Instructions for upgrading the monitor's firmware and e-manual via USB.

How To Upgrade Sub Micom

Procedures for upgrading the sub-micom software for the monitor.

Sub S;W (with DDC Manager)

Procedure for upgrading sub-micom software using DDC Manager tool.

Sub S;W (in Factory mode)

Alternative method for upgrading sub-micom software directly from the factory mode.

Mechanical diagram

Diagrams showing mechanical dimensions and weight specifications of the monitors.

LT20 A350; LT22 A350; LT23 A350; LT24 A350

Mechanical dimensions and weight specifications for specific monitor models.

LT22 A550; LT23 A550; LT24 A550; LT27 A550

Mechanical dimensions and weight specifications for other monitor models.

PCB diagram

Diagrams illustrating the Printed Circuit Board (PCB) layout and components.

PCB layout

Layout diagram of the main PCB, showing component and connector locations.

Wiring Diagram

Wiring Diagram

Overall block diagram illustrating connections between major internal components.

Connector

Pin assignments for various connectors on the main board and other modules.

Connector Functions

Explanation of the functions of specific connectors and their signal transfers.

Cables

Identification and specifications for various internal cables used in the monitor.

Samsung LT20A350 Specifications

General IconGeneral
Resolution1600 x 900
Panel TypeTN
Response Time5ms
Brightness250 cd/m²
Aspect Ratio16:9
Screen Size20 inches
Contrast Ratio1000:1
Viewing Angle170° (Horizontal), 160° (Vertical)
Input Ports1 x VGA

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