Samsung 732, 932 Service manual

LCD-Monitor

Chassis Model

LS17PEA 732N 732NPLUS

LS19PEB 932B 932BPLUS

LS19PEA 932NPLUS

SERVICE Manual

TFT-LCD Monitor		Fashion Feature

-Lustrous/Colorful Appearance (Design) -Integrated UI applied

-Built-in Scaler Sync Separator -Connectivity :

LS17PEA, LS19PEA - Analog (15p Dsub) LS19PEB - Analog (15p Dsub),

Dual (24p DVI-D)

-Power Consumption : 17"(34W), 19"(38W) -DPMS : under 1 W (230Vac)

Copyright

©2006 by Samsung Electronics Co., Ltd. All rights reserved.

This manual may not, in whole or in part, be copied, photocopied, reproduced, translated, or converted to any electronic or machine readable form without prior written permission of Samsung Electronics Co., Ltd.

LS17PEA/LS19PEA/LS19PEB Service Manual

First edition February 2006.

Printed in Korea.

Trademarks

Samsung is the registered trademark of Samsung Electronics Co., Ltd.

LS17PEA/LS19PEA/LS19PEB and MacMaster Cable Adapter are trademarks of Samsung Electronics Co., Ltd.

Macintosh, Power Macintosh are trademarks of Apple Computer, Inc.

All other trademarks are the property of their respective owners.

ii

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 Fashion Feature…………………………………………………………………………………………………………………………… 2-1

2-2 LS17PEA Specifications ………………………………………………………………………………………………………………… 2-1

2-3 LS19PEB Specifications ………………………………………………………………………………………………………………… 2-2

2-3 LS19PEA Specifications ………………………………………………………………………………………………………………… 2-4

2-4 Spec Comparison ………………………………………………………………………………………………………………………… 2-5

2-5 Option Specification ……………………………………………………………………………………………………………………… 2-6

3. Alignments and Adjustments …………………………………………………………………………………………………………………3-1

3-1 Required Equipment …………………………………………………………………………………………………………………… 3-1 3-2 Automatic Color Adjustment …………………………………………………………………………………………………………… 3-1 3-3 DDC EDID Data Input …………………………………………………………………………………………………………………… 3-1 3-4 OSD Adjustment When Replacing Panel ……………………………………………………………………………………………… 3-1 3-5 OSD Adjustment When Replacing Lamp Only ………………………………………………………………………………………… 3-1 3-6 Service Function Spec. ………………………………………………………………………………………………………………… 3-2 3-7 How to execute DDC …………………………………………………………………………………………………………………… 3-4 3-8 How to execute MCU Code ……………………………………………………………………………………………………………… 3-5

4. Troubleshooting ………………………………………………………………………………………………………………………………4-1

4-1 No Power) …………………………………………………………………………………………………………………………………4-1 4-2 No Video (ANALOG)……………………………………………………………………………………………………………………… 4-2 4-3 No Video (DIGITAL) ……………………………………………………………………………………………………………………… 4-4

5. Exploded View and Parts List ………………………………………………………………………………………………………………5-1 6. Electrical Parts List ……………………………………………………………………………………………………………………………6-1

Contents

7.Block Diagram …………………………………………………………………………………………………………………………………7-1 7-1 Power Tree ………………………………………………………………………………………………………………………………… 7-1 7-2 Main Board Part ( LS17PEA, LS19PEA) ……………………………………………………………………………………………… 7-2 7-3 Main Board Part ( LS19PEB) …………………………………………………………………………………………………………… 7-3 7-4 IP Board Part (SMPS Part) ……………………………………………………………………………………………………………… 7-4

7-5 IP Board Part (Inverter Part) …………………………………………………………………………………………………………… 7-5

8. Wiring Diagram …………………………………………………………………………………………………………………………………8-1 8-1 Wiring Diagram LS17PEA, LS19PEA ………………………………………………………………………………………………… 8-1 8-2 Wiring Diagram LS19PEB ……………………………………………………………………………………………………………… 8-2

9. Schematic Diagrams ……………………………………………………………………………………………………………………………9-1 9-1 Schematic Diagrams (LS17PEA, LS19PEA) ………………………………………………………………………………………… 9-1 9-2 Schematic Diagrams (LS19PEB) ……………………………………………………………………………………………………… 8-2

10. Operating Instructions and Installation ……………………………………………………………………………………………………10-1 10-1 Front …………………………………………………………………………………………………………………………………… 10-1 10-2 Rear……………………………………………………………………………………………………………………………………… 10-2 10-3 Connecting the monitor ……………………………………………………………………………………………………………… 10-3

11. Disassembly and Reassembly ………………………………………………………………………………………………………………11-1 11-1 Disassembly …………………………………………………………………………………………………………………………… 11-1 11-2 Reassembly …………………………………………………………………………………………………………………………… 11-6

12. PCB Diagram …………………………………………………………………………………………………………………………………12-1 12-1 Main PCB (LS17PEA, LS19PEA) …………………………………………………………………………………………………… 12-1 12-2 Main PCB (LS19PEB) ………………………………………………………………………………………………………………… 12-2

13. Circuit Descriptions ……………………………………………………………………………………………………………………………13-1 13-1 Overall Block Structure ……………………………………………………………………………………………………………… 13-1 13-2 Trouble Shooting ……………………………………………………………………………………………………………………… 13-5 13-3 IP BOARD(Power) Schematic Diagrams …………………………………………………………………………………………… 13-8 13-4 IP BOARD(Inverter) Schematic Diagrams ………………………………………………………………………………………… 13-9

14. Reference Infomation

14-1 Technical Terms ……………………………………………………………………………………………………………………… 14-1

14-2 Pin Assignments ……………………………………………………………………………………………………………………… 14-3

14-3 Timing Chart …………………………………………………………………………………………………………………………… 14-4 14-4 Preset Timing Modes ………………………………………………………………………………………………………………… 14-5 14-5 Panel Description ……………………………………………………………………………………………………………………… 14-6

-This Service Manual is a property of Samsung Electronics Co., Ltd.

Any unauthorized use of Manual can be punished under applicable International and/or domestic law.

Samsung Electronics Co.,Ltd.

416, Maetan-3Dong, Yeongtong-Gu, Suwon City, Gyeonggi-Do, Korea, 443-742

Printed in Korea

P/N : BN82-00138H-02

URL : http://itself.sec.samsung.co.kr/

1 Precautions

1 Precautions

Follow these safety, servicing and ESD precautions to prevent damage and to protect against potential hazards such as electrical shock.

1-1 Safety Precautions

1-1-1 Warnings

1.For continued safety, do not attempt to modify the circuit board.

2.Disconnect the AC power and DC power jack before servicing.

1-1-2 Servicing the LCD Monitor

1.When servicing the LCD Monitor, Disconnect the AC line cord from the AC outlet.

2.It is essential that service technicians have an accurate voltage meter available at all times. Check the calibration of this meter periodically.

1-1-3 Fire and Shock Hazard

Before returning the monitor to the user, perform the following safety checks:

1.Inspect each lead dress to make certain that the leads are not pinched or that hardware is not lodged between the chassis and other metal parts in the monitor.

2.Inspect all protective devices such as nonmetallic control knobs, insulating materials, cabinet backs, adjustment and compartment covers or shields, isolation resistorcapacitor networks, mechanical insulators, etc.

3.Leakage Current Hot Check (Figure 1-1):

WARNING : Do not use an isolation transformer during this test.

Use a leakage current tester or a metering system that complies with American National Standards Institute (ANSI C101.1, Leakage Current for Appliances), and Underwriters Laboratories (UL Publication UL1410, 59.7).

Figure 1-1. Leakage Current Test Circuit

4.With the unit completely reassembled, plug the AC line cord directly into a 120V AC outlet. With the unit’s AC switch first in the ON position and then OFF, measure the current between a known earth ground (metal water pipe, conduit, etc.) and all exposed metal parts, including: metal cabinets, screwheads and control shafts. The current measured should not exceed 0.5 milliamp. Reverse the power-plug prongs in the AC outlet and repeat the test.

1-1-4 Product Safety Notices

Some electrical and mechanical parts have special safetyrelated characteristics which are often not evident from visual inspection. The protection they give may not be obtained by replacing them with components rated for higher voltage, wattage, etc. Parts that have special safety characteristics are identified by on schematics and parts lists. A substitute replacement that does not have the same safety characteristics as the recommended replacement part might create shock, fire and/or other hazards. Product safety is under review continuously and new instructions are issued whenever appropriate.

1-1

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.

1-2-1 General Servicing

Precautions

1.Always unplug the unit’s AC power cord from the AC power source and disconnect the DC Power Jack before attempting to:

(a) remove or reinstall any component or assembly, (b) disconnect PCB plugs or connectors, (c) connect a test component in parallel with an electrolytic capacitor.

2.Some components are raised above the printed circuit board for safety. An insulation tube or tape is sometimes used. The internal wiring is sometimes clamped to prevent contact with thermally hot components. Reinstall all such elements to their original position.

3.After servicing, always check that the screws, components and wiring have been correctly reinstalled. Make sure that the area around the serviced part has not been damaged.

4.Check the insulation between the blades of the AC plug and accessible conductive parts (examples: metal panels, input terminals and earphone jacks).

5.Insulation Checking Procedure: Disconnect the power cord from the AC source and turn the power switch ON. Connect an insulation resistance meter (500 V) to the blades of the AC plug.

The insulation resistance between each blade of the AC plug and accessible conductive parts (see above) should be greater than 1 megohm.

6.Always connect a test instrument’s ground lead to the instrument chassis ground before connecting the positive lead; always remove the instrument’s ground lead last.

1-3 Electrostatically Sensitive Devices (ESD) Precautions

Some semiconductor (solid state) devices can be easily damaged by static electricity. Such components are commonly called Electrostatically Sensitive Devices (ESD). Examples of typical ESD are integrated circuits and some field-effect transistors. The following techniques will reduce the incidence of component damage caused by static electricity.

1.Immediately before handling any semiconductor components or assemblies, drain the electrostatic charge from your body by touching a known earth ground. Alternatively, wear a discharging wrist-strap device. To avoid a shock hazard, be sure to remove the wrist strap before applying power to the monitor.

2.After removing an ESD-equipped assembly, place it on a conductive surface such as aluminum foil to prevent accumulation of an electrostatic charge.

3.Do not use freon-propelled chemicals. These can generate electrical charges sufficient to damage ESDs.

4.Use only a grounded-tip soldering iron to solder or desolder ESDs.

5.Use only an anti-static solder removal device. Some solder removal devices not classified as “anti-static” can generate electrical charges sufficient to damage ESDs.

6.Do not remove a replacement ESD from its protective package until you are ready to install it. Most replacement ESDs are packaged with leads that are electrically shorted together by conductive foam, aluminum foil or other conductive materials.

7.Immediately before removing the protective material from the leads of a replacement ESD, touch the protective material to the chassis or circuit assembly into which the device will be installed.

Caution: Be sure no power is applied to the chassis or circuit and observe all other safety precautions.

8.Minimize body motions when handling unpackaged replacement ESDs. Motions such as brushing clothes together, or lifting your foot from a carpeted floor can generate enough static electricity to damage an ESD.

1-2

1 Precautions

1-4 Installation Precautions

1.For safety reasons, more than two 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.Do not place the product in areas with poor ventilation such as a bookshelf or closet. The increased internal temperature may cause fire.

4.Bend the external antenna cable when connecting it to the product. This is a measure to protect it from being exposed to moisture. Otherwise, it may cause a fire or electric shock.

5.Make sure to turn the power off and unplug the power cord from the outlet before repositioning the product. Also check the antenna cable or the external connectors if they are fully unplugged. Damage to the cord may cause fire or electric shock.

6.Keep the antenna far away from any high-voltage cables and install it firmly. Contact with the highvoltage cable or the antenna falling over may

cause fire or electric shock.

7.When installing the product, leave enough space (10cm) between the product and the wall for ventilation purposes.

A rise in temperature within the product may cause fire.

1-3

1 Precautions

Memo

1-4

2 Product Specifications

2 Product Specifications

2-1 Fashion Feature

-. Minimalism Design Something New

-. Boltless Model (Clean Cut & Soft Surface)

-. New Ball Hinge

-. Color Variation. White, Black

2-2 LS17PEA Specifications

Item	Description
LCD Panel	TFT-LCD panel, RGB vertical stripe, normally black transmissive,
	17-Inch viewable, 0.264 (H) x 0.264 (V) mm pixel pitch
Scanning Frequency	Horizontal : 31 kHz ~ 81 kHz (Automatic)
	Vertical : 56 Hz ~ 75 Hz (UXGA : 60 Hz)
Display Colors	16.7 Million colors
Maximum Resolution	Horizontal : 1280 Pixels
	Vertical : 1024 Pixels
Input Signal	Analog
Input Sync Signal	Seperate H/V sync, Composite H/V, Sync-on-Green, Automatic synchroniza
	tion whitout external swith of sync type
	Level : TTL level
Maximum Pixel Clock rate	135 MHz
Active Display	337(H) x 270(W) mm
Horizontal/Vertical
AC power voltage & Frequency	AC 90 ~ 264 Volts, 60/50 Hz
Power Consumption	34W (Max)
Dimensions
Set (W x D x H)	376.0 x 177.0 x 380.0 mm
Weight (Set/Package)	3.2kg / 4.3kg
Environmental Considerations	Operating Temperature : 0˚F ~ 122˚F (0 ~ 50 )
	Operating Humidity : 20% ~ 90%
	Storage temperature : -4˚F ~ 149˚F (-20 ~ 65 )
	Storage Humidity : 5% ~ 90%

- Designs and specifications are subject to change without prior notice.

2-1

2 Product Specifications

2-3 LS19PEB Specifications

Item	Description
LCD Panel	TFT-LCD panel, RGB vertical stripe, normally black transmissive,
	19-Inch viewable, 0.294 (H) x 0.294 (V) mm pixel pitch
Scanning Frequency	Horizontal : 31 kHz ~ 81 kHz (Automatic)
	Vertical : 56 Hz ~ 75 Hz (UXGA : 60 Hz)
Display Colors	16.7 Million colors
Maximum Resolution	Horizontal : 1280 Pixels
	Vertical : 1024 Pixels
Input Signal	Analog / Digital
Input Sync Signal	Seperate H/V sync, Composite H/V, Sync-on-Green, Automatic synchroniza
	tion whitout external swith of sync type
	Level : TTL level
Maximum Pixel Clock rate	135 MHz
Active Display	376.3(H) x 301.05(W) mm
Horizontal/Vertical
AC power voltage & Frequency	AC 90 ~ 264 Volts, 60/50 Hz
Power Consumption	38W (Max)
Dimensions
Set (W x D x H)	418.0 x 199.0 x 418.0 mm
Weight (Set/Package)	4.0kg / 5.3kg
Environmental Considerations	Operating Temperature : 0˚F ~ 122˚F (0 ~ 50 )
	Operating Humidity : 20% ~ 90%
	Storage temperature : -4˚F ~ 149˚F (-20 ~ 65 )
	Storage Humidity : 5% ~ 90%

- Designs and specifications are subject to change without prior notice.

2-2

2 Product Specifications

2-4 LS19PEA Specifications

Item	Description
LCD Panel	TFT-LCD panel, RGB vertical stripe, normally black transmissive,
	19-Inch viewable, 0.294 (H) x 0.294 (V) mm pixel pitch
Scanning Frequency	Horizontal : 31 kHz ~ 81 kHz (Automatic)
	Vertical : 56 Hz ~ 75 Hz (UXGA : 60 Hz)
Display Colors	16.7 Million colors
Maximum Resolution	Horizontal : 1280 Pixels
	Vertical : 1024 Pixels
Input Signal	Analog
Input Sync Signal	Seperate H/V sync, Composite H/V, Sync-on-Green, Automatic synchroniza
	tion whitout external swith of sync type
	Level : TTL level
Maximum Pixel Clock rate	135 MHz
Active Display	376.3(H) x 301.05(W) mm
Horizontal/Vertical
AC power voltage & Frequency	AC 90 ~ 264 Volts, 60/50 Hz
Power Consumption	38W (Max)
Dimensions
Set (W x D x H)	418.0 x 199.0 x 418.0 mm
Weight (Set/Package)	4.0kg / 5.3kg
Environmental Considerations	Operating Temperature : 0˚F ~ 122˚F (0 ~ 50 )
	Operating Humidity : 20% ~ 90%
	Storage temperature : -4˚F ~ 149˚F (-20 ~ 65 )
	Storage Humidity : 5% ~ 90%

- Designs and specifications are subject to change without prior notice.

2-3

2 Product Specifications

2-5 Spec Comparison

Model		BI17BS / 19BS		LS17PEA / LS19PEA / LS19PEB
Design
Frequency
Horizontal		30 ~ 81 kHz		30 ~ 81 kHz
Vertical		60 ~ 75 Hz		60 ~ 75 Hz
Display Color		16,2M colors		16,7M colors
PC Resolution
Maximum mode		1280 x 1024 / 60 Hz		1280 x 1024 / 60 Hz
Input Signal
Sync Signal		H/V Separate, TTL, P. or N.		H/V Separate, TTL, P. or N.
Video Signal		0.7 Vp-p @ 75ohm		0.7 Vp-p @ 75ohm
Power
Consumption		34W / 38W		34W / 38W
Normal
		< 1W		< 1W
Power Saving
Response Time		8ms		17" : 5ms
				19" : 5ms
Anion Option		None		None
Magic Color		Support		Support (Deleted Magic Zone)

2-4

2 Product Specifications

2-6 Option Specification
Item	Item Name	CODE.NO	Remark
	Quick Setup Guide	BN68-01002C
	Warranty Card
	(Not available in all	AA68-00371C
	locations)
	User's Guide,	LS17PEA, LS19PEB:
		BN59-00585A
	Monitor Driver,
	Natural Color software,	LS19PEA:
	MagicTune™ software
		BN59-00585L
	D-Sub(15 Pin)	BN39-00244B
	Cable
	Power Cord	3903-000042
	DVI Cable	BN39-00246F	Sold separately

2-5

2 Product Specifications

Memo

2-6

3 Alignments and Adjustments

3 Alignments and Adjustments

This section of the service manual explains how to use the DDC MANAGER JIG. This function is needed for AD board change and program memory (IC110) change.

3-1 Required Equipment

The following equipment is necessary for adjusting the monitor:

-Computer with Windows 95, Windows 98, or Windows NT.

-MTI-2031 DDC MANAGER JIG

3-2 Automatic Color Adjustment

To input video, use 16 gray or any pattern using black and white.

1.Select english for OSD language.

2.Press the " (Enter/Source)" key for 5 seconds.

3-3 DDC EDID Data Input

1.Input DDC EDID data when replacing AD PCB.

2.Receive/Download the proper DDC file for the model from HQ quality control department. Install the below jig (Figure 1) and enter the data.

MTI-2031

DDC Manager

Parallel Connector

(25P Cable)

Connect Monitor

(Signal Cable)

Figure 1.

3-4 OSD Adjustment When Replacing Panel

1.Adjust brightness and contrast to 0. Then, press the (Enter/Source) key for 5 seconds. Service function OSD will appear on screen.

2.Press the + key to place the cursor on the panel. Press the menu key for 5 seconds.

3-5 OSD Adjustment When Replacing Lamp Only

1.Adjust brightness and contrast to 0. Then, press the exit key for 5 seconds. Service function OSD will appear on the screen.

2.Press the + key. Select upper lamp and press the menu key for 5 seconds. Then, select lower lamp and press the menu key for 5 seconds.

-Note : Please be sure to read the following instructions for details on service function.

3-1

3 Alignments and Adjustments

3-6 Service Function Spec.

3-6-1 How to Display Service Function OSD

1.The value for brightness and contrast should be changed to zero.

2.Within 5 seconds, press the (Enter/Source) key.

3.Service function OSD will be displayed.

-If you want to disable the service function OSD, you will have to power off.

Panel Information

Software Version

Checksum

Figure 2. The example of service function OSD

The service function OSD is based on a grid of 29 columns x 12 rows.

The service function OSD consists of panel information, software version and MICOM checksum.

3-6-2 How to Control Service Function OSD

1.With the panel selected on OSD, whenever you press the right key, the base color will change to blue from "Panel" to "Upper Lamp", "Lower Lamp".

Figure 3.

3-2

3 Alignments and Adjustments

3-6-3 How to Control Service Function OSD

-After changing the panel or lamp, you must reset service function OSD. -The case of panel change

After changing the panel, press the menu key within 5 seconds,.

Then, panel Ch. No increases one step and the panel time information is reset to zero. Simultaneously, other information is reset to zero (Upper/Lower lamp, Panel cycle).

Figure 4.

3-6-4 How to Control Service Function OSD

-In the case of Upper Lamp or Lower Lamp change

After changing the Upper Lamp or Lower Lamp,

1.Select the Upper Lamp or Lower Lamp

2.Press the Menu key within an 5 seconds.

Then, Ch. No and time will be reset to zero (selected item only).

Figure 5, 6.

3-3

3 Alignments and Adjustments

3-7 How to execute DDC

3-7-1 After exchange the Main PBA, confirm below items

1.PC color status check (Auto Color)

2.EDID Input (Analog and Digital)

3.Check the MCU Code

(After change MCU Code, Do Auto color ) 4. Factory Reset

1)Run DDC Manager MTI-2050.

2)Select a DDC file name.

Progtam : WinDDC BY SAMSUNG ELEC.Co. [Ver:4.65.12V] --- Modify : 20050425 DDC : 732N.ddc or 932B.ddc

3)Insert into DDC Manager Port 1 (analog) and make the DDC input as for the old dual model.

4)Insert into DDC Manager Port 2 (Digital) and make the DDC input.

1

2

3

4

1.Open file.

2.Select Port #1.

3.Select DDC file.

4.Click, "Next" Button

3-4

3 Alignments and Adjustments

5

5. Type in the monitor serial number and press Enter.

*Repeat this step 2 to 5 times in digital inputs after the analog input.

3-8 How to execute MCU Code

3-8-1 Program Setting - Config Setting

1

2

3

1.Click Config Setting

2.Change SCL Signal at Pin Assignments

3.Set Device to Parallel

3-5

3 Alignments and Adjustments

3-8-2 Change Batch File Path and DownLoad Code

5

4

6 7

8

4.	Change	Path to saved Path at your PC.
5.	Save	file.
6.	Write
	"batch	name.txt"

7. Click "Execute" Button

8. If	"Successful" , Hard Power On/Off until LED is Off
- If	"Error",

1.Hard

2.Write Command "forcesa"

3.Click "Execute" Button

4. Repeat

7 to 9.

3-6

4 Troubleshooting

4 Troubleshooting

Notes: 1. Before troubleshooting, setup the PC's display as below.

•Resolution: 1024 x 768

•H-frequency: 61 kHz

•V-frequency: 75 Hz

2.If no picture appears, make sure the power cord is correctly connected.

3.Check the following circuits.

•No raster appears: Function PBA, Main PBA, I/P PBA

•5V develop but no screen: Main PBA

•5V does not develop: I/P PBA

4.If you push and hold the " (Enter/Source)" button for more than 5 seconds, the monitor automatically returns to the factory preset.

4-1 No Power (17", 19")

						Check Function Ass'y.
			Yes
When Pin 4 of CN600 is 0V					No
does proper DC 13V, 5V						Change IP Board.
appear at Pin 5 and 6, 7 of
CN600 separately?
		Yes
When Pin 1 of IC600 is DC 5V					No
does proper DC 3.3V appear at						Check IC600 and related circuit.
Pin 3 of IC600?
		Yes
When Pin3 of IC602 is DC 3.3V					No
						Check IC602 and related circuit.
does proper DC1.8V appear at
Pin2 of IC602?

* All locations of this page includes Main PBA.

4-1

4 Troubleshooting

4-2 No Video (ANALOG 17", 19")

Check signal cable connection and power.

		X400 oscillate properly?						No
	1
						Yes
								No
		Is there R, G, B input at
		R101, R100 and R103?
						Yes
Is there Hsync, Vsync waveform								No
			2			3
		at Pin 100, 1 of IC 400?
						Yes
Is there Hsync, Vsync waveform								No
			2			3
		at Pin 43, 44 of IC 200?
						Yes
Does the output signal appear								No
at Pin 17~20, 22~27 of CN400?
						Yes
	There are DC 5V at Pin 1,							No
		2 and 3 of CN400?

Yes

Replace LCD Panel.

* All locations of this page includes Main PBA.

Replace or check related circuit.

Check input part.

Check IC400 and related circuit.

Check IC200 and related circuit.

Check CN400 and related circuit.

Check PANEL_EN SIGNAL at R222 is High(On:High) and BL_EN signal at R603(ON:Low) is Low

4-2

4 Troubleshooting

WAVEFORMS

1

2

3

4-3

4 Troubleshooting

4-3 No Video (DIGITAL LS19PEB)

Check signal cable connection and power.

X400 oscillate properly?

No

1

Yes

Is there R, G, B input at

No

R100,

4

R101, R102,

5

R103,

R104 and

R105?

6

6

Yes

Is there waveform

No

7

R107?

at R106,

Yes

Does the output signal

No

appear at Pin 17~20, 22~27

of CN400?

Yes

There are DC 5V at Pin 28,

No

29 and 30 of CN400?

Yes

Replace LCD Panel.

* All locations of this page includes Main PBA.

Replace or check related circuit.

Check input part.

Check input part.

Check IC400 and related circuit.

Check the PANEL_EN signal at R222 and BL_EN signal at R603.

4-4