Samsung 732, 932 Service manual

SERVICE

Manual

TFT-LCD Monitor

Fashion Feature

LCD-Monitor

Chassis Model

LS17PEA 732N

732NPLUS

LS19PEB 932B

932BPLUS

LS19PEA 932NPLUS

-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)

ii

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.

11. Precautions

………………………………………………………………………………………………………………………………………

11-1

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

2. Product specifications

…………………………………………………………………………………………………………………………

22-1

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

3. Alignments and Adjustments

…………………………………………………………………………………………………………………

33-1

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

4. Troubleshooting

………………………………………………………………………………………………………………………………

44-1

4-1 No Power) …………………………………………………………………………………………………………………………………4-1

4-2 No Video (ANALOG) ……………………………………………………………………………………………………………………… 4-2

4-3 No Video (DIGITAL) ……………………………………………………………………………………………………………………… 4-4

5

5. Exploded View and Parts List

………………………………………………………………………………………………………………

55-1

6. EElectrical Parts List

……………………………………………………………………………………………………………………………

6

6-1

Contents

77. Block Diagram

…………………………………………………………………………………………………………………………………

77-1

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

8. Wiring Diagram

…………………………………………………………………………………………………………………………………

88-1

8-1 Wiring Diagram LS17PEA, LS19PEA ………………………………………………………………………………………………… 8-1

8-2 Wiring Diagram LS19PEB ……………………………………………………………………………………………………………… 8-2

9

9. Schematic Diagrams

……………………………………………………………………………………………………………………………

99-1

9-1 Schematic Diagrams (LS17PEA, LS19PEA) ………………………………………………………………………………………… 9-1

9-2 Schematic Diagrams (LS19PEB) ……………………………………………………………………………………………………… 8-2

1

10. Operating Instructions and Installation ………………………………………………………………………………………………………10-1

10-1 Front …………………………………………………………………………………………………………………………………… 10-1

10-2 Rear……………………………………………………………………………………………………………………………………… 10-2

10-3 Connecting the monitor ……………………………………………………………………………………………………………… 10-3

1

11. Disassembly and Reassembly

………………………………………………………………………………………………………………

111-1

11-1 Disassembly …………………………………………………………………………………………………………………………… 11-1

11-2 Reassembly …………………………………………………………………………………………………………………………… 11-6

1

12. PCB Diagram

…………………………………………………………………………………………………………………………………

112-1

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

1

13. Circuit Descriptions

……………………………………………………………………………………………………………………………

113-1

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

1

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

Contents

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/

-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.

1 Precautions

1-1

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

Ser vicing 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 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 Precautions

1-2

1-2-1 General Ser vicing

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.

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.

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.

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.

1-3

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.

1-2 Ser vicing 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 Precautions

1-3

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 Precautions

1-4

Memo

2 Product Specifications

2-1

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

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

Horizontal/Vertical 337(H) x 270(W) mm
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.

Description

Item

2 Product Specifications

2-2

2-3 LS19PEB Specifications

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

Horizontal/Vertical 376.3(H) x 301.05(W) mm
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.

Description

Item

2 Product Specifications

2-3

2-4 LS19PEA Specifications

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

Horizontal/Vertical 376.3(H) x 301.05(W) mm
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.

Description

Item

2 Product Specifications

2-4

2-5 Spec Comparison

BI17BS / 19BS

Model

Design

Frequency
Horizontal
Vertical
Display Color

30 ~ 81 kHz

60 ~ 75 Hz

16,2M colors

30 ~ 81 kHz

60 ~ 75 Hz

16,7M colors

PC Resolution
Maximum mode

Input Signal
Sync Signal
Video Signal

Power
Consumption
Normal
Power Saving

8ms

None

Support

17" : 5ms
19" : 5ms

None

Support (Deleted Magic Zone)

Response Time

Anion Option

Magic Color

34W / 38W

< 1W

34W / 38W

< 1W

H/V Separate, TTL, P. or N.

0.7 Vp-p @ 75ohm

H/V Separate, TTL, P. or N.

0.7 Vp-p @ 75ohm

1280 x 1024 / 60 Hz 1280 x 1024 / 60 Hz

LS17PEA / LS19PEA / LS19PEB

2 Product Specifications

2-5

Item Item Name CODE.NO Remark

Quick Setup Guide

BN68-01002C

AA68-00371C

LS17PEA, LS19PEB:

BN59-00585A

LS19PEA:

BN59-00585L

BN39-00244B

3903-000042

BN39-00246F Sold separately

Warranty Card

(Not available in all

locations)

User's Guide,

Monitor Driver,

Natural Color software,

MagicTune™ software

D-Sub(15 Pin)

Cable

Power Cord

DVI Cable

2-6 Option Specification

Memo

2 Product Specifications

2-6

3 Alignments and Adjustments

3-1

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.

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 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.

031

Figure 1.

TI-2

DDC Manager

Parallel Connector

(25P Cable)

Connect Monitor

(Signal Cable)

3 Alignments and Adjustments

3-2

3-6 Ser vice 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.

Figure 2. The example of service function OSD

Figure 3.

Panel Information

Software Version
Checksum

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 Ser vice 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".

3 Alignments and Adjustments

3-3

Figure 4.

3-6-3 How to Control Ser vice 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 5, 6.

3-6-4 How to Control Ser vice 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).

3 Alignments and Adjustments

3-4

3-7 How to execute DDC

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

1. Open file.

2. Select Port #1.

3. Select DDC file.

4. Click, "Next" Button

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

3 Alignments and Adjustments

3-5

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

1. Click Config Setting

2. Change SCL Signal at Pin Assignments

3. Set Device to Parallel

3-8-1 Program Setting - Config Setting

1

2

3

3 Alignments and Adjustments

3-6

4. Change the Code's Path to saved Path at your PC.

5. Save the Batch file.

6. Write Batch command
"batch batch file name.txt"

7. Click "Execute" Button

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

- If command is "Error",

1. Hard Power Off

2. Write Command "forcesa"

3. Click "Execute" Button

4. Repeat again 7 to 9.

5

4

6

7

8

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

4 Troubleshooting

4-1

4 Troubleshooting

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

When Pin 4 of CN600 is 0V

does proper DC 13V, 5V

appear at Pin 5 and 6, 7 of

CN600 separately?

Change IP Board.

Check Function Ass'y.

Yes

Yes

No

When Pin 1 of IC600 is DC 5V

does proper DC 3.3V appear at

Pin 3 of IC600?

Check IC600 and related circuit.

Yes

No

When Pin3 of IC602 is DC 3.3V

does proper DC1.8V appear at

Pin2 of IC602?

Check IC602 and related circuit.

No

* All locations of this page includes Main PBA.

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 Troubleshooting

4-2

X400 oscillate properly?

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

1

Replace or check related circuit.

Check signal cable connection and

power.

Yes

No

Is there R, G, B input at
R101, R100 and R103?

Check input part.

Yes

No

Is there Hsync, Vsync waveform

at Pin 100, 1 of IC 400?

Check IC400 and related circuit.

No

2

3

Yes

Is there Hsync, Vsync waveform

at Pin 43, 44 of IC 200?

Check IC200 and related circuit.

No

Yes

Does the output signal appear

at Pin 17~20, 22~27 of CN400?

Check CN400 and related circuit.

No

Yes

There are DC 5V at Pin 1,

2 and 3 of CN400?

Check PANEL_EN SIGNAL at R222

is High(On:High) and BL_EN signal

at R603(ON:Low) is Low

No

Yes

Replace LCD Panel.

2

3

* All locations of this page includes Main PBA.

4 Troubleshooting

4-3

1

WAVEFORMS

2

3

4 Troubleshooting

4-4

X400 oscillate properly?

4-3 No Video (DIGITAL LS19PEB)

1

Replace or check related circuit.

Check signal cable connection and

power.

Yes

No

Is there R, G, B input at

R100, R101, R102, R103,

R104 and R105?

Check input part.

Yes

No

Is there waveform

at R106, R107?

Check input part.

No

Yes

Does the output signal

appear at Pin 17~20, 22~27

of CN400?

Check IC400 and related circuit.

No

Yes

There are DC 5V at Pin 28,

29 and 30 of CN400?

Check the PANEL_EN signal at R222

and BL_EN signal at R603.

No

Yes

Replace LCD Panel.

7

6 6

4 5

* All locations of this page includes Main PBA.