Samsung LT20A350 Service Manual
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Samsung LT20A350 Service Manual

Lcd tv monitor
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SERVICE
TFT-LCD TV Monitor
TA350 / TA550
LCD TV Monitor
Chassis :
WDS2
Model
:
LT20A350
LT22A350
LT23A350
LT24A350
1. Precautions
2. Product specifications
3. Disassembly and Reassembly
4. Troubleshooting
5. Wiring Diagram
WDS4
LT22A550
LT23A550
LT24A550
LT27A550
Manual
Contents

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Summary of Contents for Samsung LT20A350

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

  • Page 2: Table Of Contents

    Contents 1. Precautions ......................1-1 1-1. Safety Precautions ......................1-1 1-2. Servicing Precautions ..................... 1-2 1-3. Electrostatically Sensitive Devices (ESD) Precautions ..........1-2 1-4. Installation Precautions ....................1-3 2. Product specifications .................... 2-1 2-1. Feature & Specifications ....................2-1 2-2. Detail Factory Option ...................... 2-6 2-3.
  • Page 3 This Service Manual is a property of Samsung Electronics Co.,Ltd. © 2011 Samsung Electronics Co.,Ltd. Any unauthorized use of Manual can be punished under applicable All rights reserved. International and/or domestic law. Printed in Korea...

  • Page 4: Precautions

    1. Precautions 1. Precautions 1-1. Safety Precautions Follow these safety, servicing and ESD precautions to prevent damage and to protect against potential hazards such as electrical shock. 1-1-1. Warnings 1. For continued safety, do not attempt to modify the circuit board. 2.

  • Page 5: Servicing Precautions

    1. Precautions 1-2. Servicing Precautions WARNING: An electrolytic capacitor installed with the wrong polarity might explode. Caution: Before servicing units covered by this service manual, read and follow the Safety Precautions section of this manual. Note: If unforeseen circumstances create conflict between the following servicing precautions and any of the safety precautions, always follow the safety precautions.

  • Page 6: Installation Precautions

    1. Precautions 1-4. Installation Precautions 1. For safety reasons, more than a people are required for carrying the product. 2. Keep the power cord away from any heat emitting devices, as a melted covering may cause fire or electric shock. 3.

  • Page 7: Product Specifications

    2. Product specifications 2. Product specifications 2-1. Feature & Specifications Model LT20A350 Feature ሪ DTV/ATV, 2-HDMI, 1-Component, 1-A/V, D-SUB, 1-SCART, 1-USB2.0, CI Slot ሪ Brightness : 250 cd/m ሪ High Contrast Ratio : 1,000:1 ሪ Response Time : 5ms Specifications...
  • Page 8 2. Product specifications Model LT22A350 / LT22A550 Feature ሪ DTV/ATV, 2-HDMI, 1-Component, 1-A/V, D-SUB, 1-SCART, 1-USB2.0, CI Slot ሪ Brightness : 250 cd/m2 ሪ High Contrast Ratio : 1,000:1 ሪ Response Time : 5ms Specifications Item Description LCD Panel 22inch FHD Scanning Frequency Horizontal : 60 kHz ~ 73 kHz (Automatic) Vertical : 50 Hz ~ 75 Hz (Automatic)
  • Page 9 2. Product specifications Model LT23A350 / LT23A550 Feature ሪ DTV/ATV, 2-HDMI, 1-Component, 1-A/V, D-SUB, 1-SCART, 1-USB2.0, CI Slot ሪ Brightness : 250 cd/m2 ሪ High Contrast Ratio : 1,000:1 ሪ Response Time : 5ms Specifications Item Description LCD Panel 23inch FHD Scanning Frequency Horizontal : 54.2 kHz ~ 83.8 kHz (Automatic) Vertical : 49 Hz ~ 75 Hz (Automatic)
  • Page 10 2. Product specifications Model LT24A350 / LT24A550 Feature ሪ DTV/ATV, 2-HDMI, 1-Component, 1-A/V, D-SUB, 1-SCART, 1-USB2.0, CI Slot ሪ Brightness : 250 cd/m2 ሪ High Contrast Ratio : 1,000:1 ሪ Response Time : 5ms Specifications Item Description LCD Panel 24inch FHD Scanning Frequency "Horizontal : 54.2 kHz ~ 83.8 kHz (Automatic) Vertical : 50 Hz ~ 75 Hz (Automatic)"...
  • Page 11 2. Product specifications Model LT27A550 Feature ሪ DTV/ATV, 2-HDMI, 1-Component, 1-A/V, D-SUB, 1-SCART, 1-USB2.0, CI Slot ሪ Brightness : 300 cd/m2 ሪ High Contrast Ratio : 1,000:1 ሪ Response Time : 5ms Specifications Item Description LCD Panel 27inch FHD Scanning Frequency Horizontal : 54.2 kHz ~ 83.8 kHz (Automatic) Vertical : 49 Hz ~ 75 Hz (Automatic) Display Colors...

  • Page 12: Detail Factory Option

    2-2. Detail Factory Option ※ If you replace the main board with new one, please change the factory option as well. The options you must change are "Type" and "Front Color". 2-2-1. LT20A350 / LT22A350 / LT23A350 / LT24A350 Model Name LT20A350...
  • Page 13 2. Product specifications 2-2-2. LT22A550 / LT23A550 / LT24A550 / LT27A550 Model Name LT22A550 LT23A550 LT24A550 LT24A550 Vendor Panel CODE BN07-00937A BN07-00957A BN07-00929A BN07-00959A SPEC M215HW01 VB LTM230HT09-V M240HW01 VB LTM270HT03-V Vendor DYREL PowerNet DYREL DYREL SMPS CODE BN44-00448A BN44-00449B BN44-00450A BN44-00450A SPEC...

  • Page 14: Accessories

    22"/23"/24" : BN96-16601C Stand Base 22"/23"/24" : BN96-17582B TA550 27" : BN96-17132E 20" : BN96-17598B TA350 22" : BN96-17604B 23"/24" : BN96-17599B Samsung Electronics Stand Body Service center 22" : BN96-17583B TA550 23"/24" : BN96-17584B 27" : BN96-17585B 20" : BN96-17598B TA350 22"...
  • Page 15 2. Product specifications Product Description Mode Code. No Remark Component/AV Gender BN39-01154W SCART Gender BN39-01154F CI Card Gender 3709-001663 Samsung Electronics Service center User Manual BN46-00077A Quick Setup Guide BN68-03605* Cleaning Cloth BN63-01798B Warranty Card / Safety AA68-03242V Guide Manual BN68-00226R...

  • Page 16: New Features Explanation

    „ What is Anynet+? TOOLST Anynet+ is a function that enables you to control all connected Samsung devices that support Anynet+ with your Samsung TV’s remote. The Anynet+ system can be used only with Samsung devices that have the Anynet+ feature.
  • Page 17 Make sure to switch to an Anynet+ device by using the Device List. „ Recording You can make a recording of a TV Programme using a Samsung recorder. Select Recording. N When there are more than two recording devices When multiple recording devices are connected, the recording devices are listed.
  • Page 18 2. Product specifications „ Troubleshooting for Anynet+ Problem Possible Solution • Check if the device is an Anynet+ device. The Anynet+ system supports Anynet+ devices only. • Only one receiver (home theatre) can be connected. Anynet+ does not work. • Check if the Anynet+ device power cord is properly connected. •...
  • Page 19 • Before connecting your device to the TV, please back up your files to prevent them from damage or loss of data. SAMSUNG is not responsible for any data file damage or data loss. • USB (HDD) is not supported.
  • Page 20 2. Product specifications • The power-saving mode of some external hard disk drives may be released automatically when connected to the TV. • If a USB extension cable is used, the USB device may not be recognized or the files on the device may not be read.
  • Page 21 2. Product specifications ● Videos 01. Playing Video 1. Press the ◄/►/▲/▼ button to select the desired video in the file list. 2. Press the ENTERE button or � (Play) button. – The selected file name is displayed on the top with its playing time.
  • Page 22 2. Product specifications 02. Other Restrictions N NOTE • If there are problems with the contents of a codec, the codec will not be supported. • If the information for a Container is incorrect and the file is in error, the Container will not be able to play correctly. •...
  • Page 23 2. Product specifications ● Music 01. Playing Music 1. Press the ◄/►/▲/▼ button to select the desired Music in the file list. 2. Press the ENTERE button or � (Play) button. – You can use � (REW) μ (FF) buttons during playback.
  • Page 24 2. Product specifications ● Photos 01. Viewing a Photo (or Slide Show) 1. Press the ◄/►/▲/▼ button to select the desired Music in the file list. 2. Press the ENTERE button or � (Play) button. – When a selected photo is displayed, press the ENTERE button to start the slide show.
  • Page 25 2. Product specifications „ My Contents - Additional Functions 01. Videos/Music/Photos Play Option menu During playing a file, press the TOOLS button. Category Operation Videos Music Photos Title You can move the other file directly. You can search the video using l and r button at one minute interval or Time Search entering the number directly.

  • Page 26: Disassembly And Reassembly

    3. Disassembly and Reassembly 3. Disassembly and Reassembly This section of the service manual describes the disassembly and reassembly procedures for the Monitor. WARNING: This Monitor contains electrostatically sensitive devices. Use caution when handling these components. 3-1. Disassembly and Reassembly Cautions: 1.
  • Page 27 3. Disassembly and Reassembly Description Picture Description Screws Remove the 2 screws of the set. Remove stand. 6001-002621 Remove the 6 screws of rear-cover. 6003-001086 Lift up the rear-cover.
  • Page 28 3. Disassembly and Reassembly Description Picture Description Screws Remove the left and right speaker. Remove the 4 screws of main board. Remove the 3 screws of SMPS board. (20" : 4 screws) Remove bracket link. 6003-000115 Lift up the panel. ※...
  • Page 29 3. Disassembly and Reassembly Screw Size Code No. A (mm) B (mm) C (mm) 6003-001003 8.0±0.2 8.0-0.6 3.83~3.98 6003-001086 6.3-0.5 12.0-0.8 2.85~2.95 6003-000115 6.3-0.5 6.0-0.8 2.85~2.95...

  • Page 30: Troubleshooting

    4. Troubleshooting 4. Troubleshooting 4-1. Troubleshooting 4-1-1. Previous check 1. Check the various cable connections first. • Check to see if any cables are damaged or burnt. • Check to see if there is a disconnected or loose cable connection. •...
  • Page 31 4. Troubleshooting 4-1-2. No Power - The LEDs on the front panel do not work when connecting the power cord. Symptom - The SMPS relay does not work when connecting the power cord. - The units appears to be dead. The IP relay or the LEDs on the front panel does not work when connecting the power cord if the cables are improperly connected or the Main Board or SMPS is not functioning.
  • Page 32 4. Troubleshooting Does proper DC B13V appear at Change the LVDS cable. LVDS connector Pin #1~5 of Panel ? Does proper DC B13V Diagnostics Change the T-con b'd appear at F1 of T-con b'd? Check a other function. A power is supplied to set? (No picture part) Replace a LCD Panel.
  • Page 33 4. Troubleshooting 4-1-3. No Video (Analog PC signal) Symptom - Audio is normal but no picture is displayed on the screen. - Check the PC source Major - Check the Arsenal, Check the Main Chipset. checkpoints - This may happen when the LVDS cable connecting the Main Board and the Panel is disconnected. SMPS BOARD MAIN BOARD Power indicator LED is off.
  • Page 34 4. Troubleshooting Main Board_Top Main Board_Bottom...
  • Page 35 4. Troubleshooting „ WAVEFORMS PC input (V-sink , H-sink , R/G/B) LVDS output...
  • Page 36 4. Troubleshooting 4-1-4. No video (HDMI 1, 2, 3, 4 - Digital signal) Symptom - Audio is normal but no picture is displayed on the screen. - Check the HDMI source. Major - Check the HDMI switch, Check the Main Chipset. checkpoints - This may happen when the LVDS cable connecting the Main Board and the Panel is disconnected.
  • Page 37 4. Troubleshooting Main Board_Top Main Board_Bottom...
  • Page 38 4. Troubleshooting „ WAVEFORMS HDMI input (RX_Data, RX_Clk) LVDS output...
  • Page 39 4. Troubleshooting 4-1-5. No Video (Tuner_CVBS) Symptom - Audio is normal but no picture is displayed on the screen. - Check the Tuner CVBS source. Major - Check the Tuner, Check the Main Chipset. checkpoints - This may happen when the LVDS cable connecting the Main Board and the Panel is disconnected. SMPS BOARD MAIN BOARD Power indicator LED is off.
  • Page 40 4. Troubleshooting Main Board_Top Main Board_Bottom 4-11...
  • Page 41 4. Troubleshooting „ WAVEFORMS LVDS output 4-12...
  • Page 42 4. Troubleshooting 4-1-6. No Video (Tuner DTV) Symptom - Audio is normal but no picture is displayed on the screen. - Check the DTV source. Major - Check the Tuner, Check the Main Chipset. checkpoints - This may happen when the LVDS cable connecting the Main Board and the Panel is disconnected. SMPS BOARD MAIN BOARD Power indicator LED is off.
  • Page 43 4. Troubleshooting Main Board_Top Main Board_Bottom 4-14...
  • Page 44 4. Troubleshooting „ WAVEFORMS LVDS output 4-15...
  • Page 45 4. Troubleshooting 4-1-7. No Video (Video CVBS) Symptom - Audio is normal but no picture is displayed on the screen. - Check the Video CVBS source Major - Check the Main Chipset. checkpoints - This may happen when the LVDS cable connecting the Main Board and the Panel is disconnected. SMPS BOARD MAIN BOARD Power indicator LED is off.
  • Page 46 4. Troubleshooting Main Board_Bottom Main Board_Bottom 4-17...
  • Page 47 4. Troubleshooting „ WAVEFORMS CVBS OUT (Grey Bar) LVDS output 4-18...
  • Page 48 4. Troubleshooting 4-1-8. No Video (Component) Symptom - Audio is normal but no picture is displayed on the screen. - Check the Component source Major - Check the Main Chipset. checkpoints - This may happen when the LVDS cable connecting the Main Board and the Panel is disconnected. SMPS BOARD MAIN BOARD Power indicator LED is off.
  • Page 49 4. Troubleshooting Main Board_Bottom Main Board_Bottom 4-20...
  • Page 50 4. Troubleshooting „ WAVEFORMS Compnent_Y (Gray scale) / Pb / Pr (Color bar) LVDS output 4-21...
  • Page 51 4. Troubleshooting 4-1-9. No Sound Symptom - Video is normal but there is no sound.. - When the speaker connectors are disconnected or damaged. Major - When the sound processing part of the Main Board is not functioning. checkpoints - Speaker defect. SMPS BOARD MAIN BOARD Check the source and...
  • Page 52 4. Troubleshooting Main Board_Top E_TXCLK+/- B12VS_PW Main Board_Bottom COMP2_SL_IN PC_DVI_SR_IN COMP2_SR_IN PC_DVI_SL_IN 4-23...
  • Page 53 4. Troubleshooting „ WAVEFORMS Speaker out 4-24...

  • Page 54: Alignments And Adjustments

    4. Troubleshooting 4-2. Alignments and Adjustments 4-2-1. General Alignment Instuction 1. Usually, a color monitor needs only slight touch-up adjustment upon installation. Check the basic characteristics such as height, horizontal and vertical sync. 2. Use the specified test equipment or its equivalent. 3.

  • Page 55: Factory Mode Adjustments

    4. Troubleshooting 4-3. Factory Mode Adjustments 4-3-1. Entering Factory Mode To enter ‘Service Mode’ Press the remote -control keys in this sequence : - If you do not have Factory remote - control Power OFF INFO MENU MUTE 4-3-2. How to Access Service Mode Using the Customer Remote 1.
  • Page 56 4. Troubleshooting 4-3-3. Factory Data Option Factory Name Data Range Factory Reset Select Panel Type  : inch  : vendor 19A6TH0E / 19L6TH0E / 20A6TH0E / 22D6TF0E /  : refresh Type 22L6TF0E / 23A6TF0E / 24L6TF0E / 27A6TF0E ...
  • Page 57 4. Troubleshooting Control Factory menu Name EDID Sub Option Shop Option Sound Factory Name Data Range EDID EDID ON/OFF EDID WRITE ALL … EDID WRITE PC … Download EDID data to EEPROM. 1. Set "ON" of EDID ON/OFF EDID WRITE HDMI …...
  • Page 58 4. Troubleshooting TA350 : 32 KEY SENSITIVITY 0~255 TA550 : 34 Local Set WiFi EU_Italy EU_Germany EU_France EU_Benelux EU_UK EU_Armenia NORDIG AD_Au AD_NZ AD_Singapol CIS_Rusia CIS_Ukraina CIS_Kazakhstan EU_Turkey EU_Africa EU_Moroco EA_Vietnam EA_Thai EA_INA EA_China WIFI REGION EA_India EA_Srilanka EA_Nepal EA_Bangladesh EA_Iran EA_Israel EA_Egypt...
  • Page 59 4. Troubleshooting Hotel Option Hotel Hospitality Shop Option Shop Mode ON/OFF Exhibition Mode ON/OFF Sound High Devi ON/OFF Carrier_Mute ON/OFF Speaker Delay Normal 0~255 Audio delay for Lipsync Control for ATV sound of stereo Pilot Level High Thld 0x28h 0x00~0xff /multiplex Control for ATV sound of stereo Pilot Level Low Thld...
  • Page 60 4. Troubleshooting LNA Status Not modified Not modified Modulation Not modified Code Rate Not modified Not modified Hier Modulation Not modified Frequency Offset Not modified Timing Offset Not modified Not modified Not modified PLL Type Not modified DEMOD Type Not modified TPS LOCK Not modified RS Lock...
  • Page 61 4. Troubleshooting ADC WB Factory Menu Name ADC Target ADC RESULT Factory Name Data Range AV Calibration Success Success / Failure Comp Calibration Success Success / Failure PC Calibration Success Success / Failure HDMI Calibration Success Success / Failure ADC Target 1st_AV_Low 0 ~1020 1st_AV_High...
  • Page 62 4. Troubleshooting 2nd_R_H 0 ~ 255 2nd_G_H 0 ~ 255 2nd_B_H 0 ~ 255 Mode Sub Brightness 0 ~ 255 R_Offset 0 ~ 255 G_Offset 0 ~ 255 B_Offset 0 ~ 255 Sub Contrast 0 ~ 255 R_Gain 0 ~ 255 G_Gain 0 ~ 255 B_Gain...

  • Page 63: White Balance -Calibration

    4. Troubleshooting 4-4. White Balance - Calibration 4-4-1. White Balance -Calibration 1. Calibration AV Calibration Comp Calibration PC Calibration HDMI Calibration 4-4-2. White Balance - Adjustment (low light) (hight light) Sub Bright Sub Contrast 3. W/B R offset R gain G offset G gain B offset...

  • Page 64: White Ratio (Balance) Adjustment

    4. Troubleshooting 4-5. White Ratio (Balance) Adjustment 1. You can adjust the white ratio in factory mode (1:Calibration, 3:White-Balance). 2. Since the adjustment value and the data value vary depending on the input source, you have to adjust these in CVBS, Component 1 and HDMI 1 modes.

  • Page 65: Servicing Information

    4-6. Servicing Information 4-6-1. USB Download Method (Main SW & e-Manual) Samsung may offer upgrades for Monitor’s firmware in the future. Upgrades will be possible by connecting a USB drive to the USB port located on your TV. 1. Insert a USB drive containing the firmware (T-MSTMDEUC) upgrade into the USB port on the rear of the Monitor.

  • Page 66: How To Upgrade Sub Micom

    4. Troubleshooting 4-7. How To Upgrade Sub Micom 4-7-1. Sub S/W (with DDC Manager) Order Description Connect DDC MANAGER to the TV Set with D-SUB cable. And Power on. (USB type : MTI-2510 / parallel type : MTI-2059) Open the DDC tool. (Parallel type &...
  • Page 67 4. Troubleshooting Order Description Push the 'Auto Program' Button. (It takes about 15 seconds.) If update completes, TV set will booting automatically. Disconnect the JIG. 4-7-2. Sub S/W (in Factory mode) If you don't have DDC Manager, Use this method. Into the Factory Mode.

  • Page 68: Mechanical Diagram

    4. Troubleshooting 4-8. Mechanical diagram 4-8-1. LT20A350 / LT22A350 / LT23A350 / LT24A350 LT20A350 LT22A350 LT23A350 LT24A350 "Set with Stand 487.8 x 214.2 x 387.3 523.9 x 239.2 x 413.5 555.7 x 239.2 x 431.9 578.6 x 239.2 x 444.6 (W x D x H)"...

  • Page 69: Pcb Diagram

    4. Troubleshooting 4-9. PCB diagram 4-9-1. PCB layout „ Mian PCB CN1201 CN302 FUNCTION CNT SPEAKER CNT H/P OUT IC1201 SUB MICOM TUNER CN201 POWER CNT IC1301 FLASH IC1101 DDR SCART IC1102 DDR COMP IC1111 X5 Scaler D-SUB CN1602_FHD LVDS CNT PC L/R OPTICAL USB1...
  • Page 70 4. Troubleshooting BOTTOM 4-41...
  • Page 71 4. Troubleshooting „ SMPS PCB Model / Inch CODE 20” / 23” BN44-00449B PD23A0_BPN Model / Inch CODE 22” BN44-00448A PD22A0_BDY 4-42...
  • Page 72 4. Troubleshooting Model / Inch CODE 24” / 27” BN44-00450A PD27A0_BDY 4-43...

  • Page 73: Wiring Diagram

    5. Wiring Diagram 5. Wiring Diagram 5-1. Wiring Diagram...

  • Page 74: Connector

    5. Wiring Diagram 5-2. Connector POWER IN (CN201) FUNCTION (CN1201) MSDA SW_POWER B12VS FUNC_INTR SW_INVERTER 3.3V LED_STB B13V MSCL SPEAKER (CN302) B13V B12VS PWM_DIMMING LVDS OUT (option by inch) PC/DIV SOUND (CN402) 19" (CN1602_HD) Panel_VCC ODDCLK+ PC_SL_IN Panel_VCC ODDCLK- PC_SR_IN Panel_VCC USB (CN1501) Panel_VCC...
  • Page 75 5. Wiring Diagram SCART (CN501_SC) SC_G SC_CVBS_IN IDENT_SC SC_B SC_CVBS_OUT SC_SL_IN SC_FB SC_SR_IN SC_R SC_SL_OUT SC_SR_OUT COMPONENT/AV (CN503) COMP_Y/AV_CVBS IDENT_COMP COMP_PB SL_IN IDENT_AV SR_IN COMP_PR TUNER RF_AGC IF-AGC DIF 1 DIF 2 CVBS IF-TP...

  • Page 76: Connector Functions

    5. Wiring Diagram 5-3. Connector Functions Connector Functions Main  IP (14p) Supply main power and dimming signal from IP Board to Main Board. The LVDS signal transfered from Main Board to Panel. Main  T-CON (30p LVDS) Supply power from IP board to Driver Board. IP ...

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