Samsung SyncMaster 510N User manual

SS
TFT-LCD MONITOR
Chassis Model
MJ15AS* 510N
MJ15BS* 510T
MJ17AS* 710N
MJ17BS* 710T
MJ19AS* 910N
MJ19BS* 910T
S
ERVIC,
Manual
CONTENTS
TFT-LCD MONITOR
1. Precautions
2. Product Specifications
3. Disassembly & Reassembly
4. Alignments & Adjustments
5. Troubleshooting
6. Exploded View & Parts List
sino ene 7. Electrical Parts List
8. Block Diagram
9. Wiring Diagram
_ 10. PCB Layout
11. Schematic Diagrams
12. Panel Description
Pivot Stand

Copyright
© 2004 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.
MYJ15AS* / MJ15BS* /MJ17AS* /MJ17BS* / MJ19AS*/
MJ19BS* Service Manual
First edition February 2004.
Printed in Korea.
Trademarks
Samsung is the registered trademark of Samsung
Electronics Co., Ltd.
MJ15AS*/MJ15BS*/MJ17AS* /MJ17BS*/MJ19AS* /
MJ19BS* 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.
MJ15AS*/MJ17AS*/MJ19AS*/
MJ15BS*/MJ17BS*/MJ19BS*

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
=
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 resistor-capacitor 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).
(READING SHOULD
NOT BE ABOVE 0.5mA)
LEAKAGE
CURRENT
TESTER
DEVICE
UNDER
TEST
TEST ALL
EXPOSED METAL
SURFACES
2-WIRE CORD
“ALSO TEST WITH
PLUG REVERSED
{USING AC ADAPTER =
PLUG AS REQUIRED) EARTH
GROUND
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
safety-related 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
ZX 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.
MJ15AS*/MJ17AS*/MJ19AS*/
MJ15BS*/MJ17BS*/MJ19BS*
1-1

1 Precautions
1-2 Servicing Precautions
WARNING:
Caution:
Note:
section of this manual.
An electrolytic capacitor installed with the wrong polarity might explode.
Before
servicing
units
covered
by
this
service
manual,
read
and
follow
the
Safety
Precautions
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 4,
AC power source and disconnect the DC Power
Jack before attempting to:
(a) remove or reinstall any component or assembly, 5.
(b) disconnect PCB plugs or connectors, (c) connect
a test component in parallel with an electrolytic
capacitor.
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.
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.
Check the insulation between the blades of the AC
plug and accessible conductive parts (examples:
metal panels, input terminals and earphone jacks).
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.
Always connect a test instrument’s ground lead to
the instrument chassis ground before connecting
the positive lead; always remove the instru ment’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.
1-2
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 7;
the monitor.
After removing an ESD-equipped assembly, place it
ona conductive surface such as aluminum foil to
prevent accumulation of an electrostatic charge.
Do not use freon-propelled chemicals. These can
generate electrical charges sufficient to damage
ESDs.
Use only a grounded-tip soldering iron to solder or
desolder ESDs.
Use ory an anti-static solder removal device. Some
solder removal devices not classified as “anti-static”
can generate electrical charges sufficient to damage
ESDs.
6.
x
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.
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.
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.
MJ15AS*/MJ17AS*/MJ19A5*/
MJ15BS*/MJ17BS*/MJ19BS*

| OT a a a a a DS OE EE a ot
2 Product Specifications
2-1 MJ15AS*/MJ15BS*/MJ17AS*/MJ17BS* Specifications
Item
Description
MJ15AS*/MJ15BS*
MJ17AS*/MJ17BS*
LCD Panel
TFT-LCD panel, RGB vertical stripe, normally black transmissive,
15-Inch viewable, 0.297 (H) x 0.297 (V} mm pixel pitch
TFT-LCD panel, AGB vertical stripe, normally black transmissive,
17-Inch viewable, 0.264 (H) x 0.264 (V) mm pixel pitch
Scanning Frequency
Horizontal : 31 kHz ~ 61 kHz (Automatic}
Vertical : 50 Hz ~ 75 Hz
Horizontal : 30 kHz ~ 81 kHz (Automatic)
Vertical : 56 Hz ~ 75 Hz
Display Colors
16.2 Million colors
Maximum Resolution
Horizontal : 1024 Pixels
Vertical : 768 Pixels
Horizontal : 1280 Pixels
Vertical : 1024 Pixels
Input Video Signal
Analog, 0.714 Vp-p + 5% positive at 75 Q,
internally terminated
Input Syne Signal
Maximum Pixel Clock rate
Active Display
Horizontal/Vertical
pee
AC power voltage & Frequency
Power Consumption
Dimensions
Set (W x D x H)
Package
Type : Separate H/V sync, Composite H/V
Level : TTL level (V high > 2.0 V, V low < 0.8 V), Sync-on-Green (< --0.25 V)
80 MHz
304.1 mm / 228.1 mm
4
135 MHz
338+ 3mm /270+3mm
_
AC 90 ~ 264 Volts, 60/50 Hz + 12V / 3A
25W (normal)
Simple Stand / Pivot Stand
AC 90 ~ 264 Volts, 60/50 Hz + 3 Hz
34W (normal)
Simple Stand |
133x22x 10.7 Inches (338.0 x 56:3 x 272.0 mm] State of stand disassembled
13.3.x6.9 x 133 laches (338.0 x 175.0 x 337.0 mm) State of stand installed
15.3 x 4.9 x 15.1 Inches (388 x 125 x 383 mm)
146% 24x 12.4 Inches (370.0 x 60.3 x 316.0 mm) State of stand disassembled
14.6 x 6.9 x 15 Inches (370.0 x 175.0 x 381.0 mm) State of stand installed
17.9 x 5.6 x 17.2 Inches (455 x 141 x 437 mm)
Weight (Set/Package}
3.1 kg (6.8 Ibs) / 4.25 kg (9.4 Ibs) 4.5 kg (9.9 Ibs) / 6.15 kg (13.6 Ibs)
Dimensions
Set (W x D x H)
Package
Pivot Stand
146 x 24x 124 Inches (370.0 x 60.3 x 316.0 mm| State of stand disassembled
146 x 75x 16.0 Inches (370.0 x 190.9 x 406.8 mr) State of stand installed
20.0 x 10.1 x 16.0 Inches (508 x 256 x 407 mm}
Weight (Set/Package)
6.25 kg (13.8 Ibs) / 7.95 kg (17.5 Ibs)
Environmental Considerations
Operating Temperature : 50°F ~ 104°F (10°C ~ 40°C)
Operating Humidity : 10 % ~ 80%
Storage Temperature : -13°F ~ 113°F (-25°C ~ 45°C)
Storage Humidity : 5 % ~ 95 %
© Designs and specifications are subject to change without prior notice.
MJ15AS*/MJ17AS*/MJ19AS*/
MJ15BS*/MJ17BS*/MJ19BS*
2-1

2 Product Specifications
2-2 MJ19AS*/MJ19BS* Specifications
—
Item
LCD Panel
Description
TFT-LCD panel, RGB vertical stripe, normally black transmissive,
19-Inch viewable, 0.297 (H) x 0.297 (V) mm pixel pitch
ao,
Scanning Frequency
Horizontal : 31 kHz ~ 61 kHz (Automatic)
Vertical : 55 Hz ~ 76 Hz
Display Colors
16.2 Million colors
Maximum Resolution
Horizontal : 1280 Pixels
Vertical : 1024 Pixels
Input Video Signal
Analog, 0.7 Vp-p + 5% positive at 75 Q,
————|
Input Sync Signal
Maximum Pixel Clock rate
Active Display
Horizontal/Vertical
a terminated
AC power voltage & Frequency
Type : Separate H/V sync, Composite H/V
Level : TTL level (V high > 2.0 V, V low < 0.8 V), Sync-on-Green (< ~0.25 V)
135 MHz
376.32 mm +3 mm / 301.056 mm + 3 mm
AC 90 ~ 264 Volts, 60/50 Hz + 3Hz
Power Consumption
Dimensions
Set (W x D x H)
Package
38W (normal)
Simple Stand Pivot Stand
16.4x 24 x 138 Inches (416.6 x 60.2 x 3494 mm State of stand disassembled
164x727 x 16.7 Inches (446.6 x 195.7 x 424.6 mm) State of stand installed
20.0 x 5.9 x 19.4 Inches (509 x 150 x 494 mm)
16.4% 24 x 13.8 Inches (416.6 x 60.2 x 349.4 mm} State of stand disassembled
16.475 x 167 Inches (416.6 x 190.9 x 423.4 mm| State of stand installed
21.1x 9.4 x 17.4 Inches (535 x 238 x 443 mm}
Weight (Set/Package)
5.85 kg (12.9 Ibs} / 7.8 kg (17.2 Ibs} 7.30 kg (16.1 Ibs) / 9.1 kg (20.1 Ibs)
Environmental Considerations
Operating Temperature : 50°F ~ 104°F (10°C ~ 40°C)
Operating Humidity : 10 % ~ 80 %
Storage Temperature : -13°F ~ 113°F (-25°C ~ 45°C)
Storage Humidity : 5 % ~ 95 %
* Designs and specifications are subject to change without prior notice.
MJ15AS*/MJ17AS*/MJ19AS*/
MJ15BS*/MJ17BS*/MJ19BS*

2 Product Specifications
2-3 Pin Assignments
15-Pin D-Sub Signal Cable Connector
Sync
Type
oOo a ws DF FP WH NY —
= SS
= ne lO
Rx2-
Rx2+
GND
No Connection
No Connection
DDC Clock (SCL)
DDC Data (SDA)
NC
Ax1-
Rx1+
NC
No Connection
24P DVI-D
Pin No. Separate Composite Sync-on-green
\ Red Red Red
2 Green Green Green + H/V Sync.
3 Blue Blue Blue
4 GND GND GND
5 DDC Return (GND) DDC Return (GND} DDC Return (GND)
6 GND-R GND-R GND-R
7 GND-G GND-G GND-G
8 GND-B GND-B GND-B
9 DDC Power Input (+5V) DDC Power Input (+5V) DDC Power Input (+5V)
10 Self Raster Self Raster Self Raster
11 GND GND GND
12 Bi-Dr Data (SDA) Bi-Dr Data (SDA) Bi-Dr Data (SDA)
H-Syne. H/V-Syne. Not Used
V-Syne. Not Used Not Used
DDC Clock (SCL) DDC Clock (SCL) DDC Clock (SCL)
No Connection
+5V_M
Self Raster
+5V_M
Rx0-
Rx0+
NC
No Connection
No Connection
NC
RxC+
RxC-
MJ15AS*/MJ17AS*/MJ19AS*/
MJ15BS*/MJ17BS*/MJ19BS*
2-3

2 Product Specifications
2-4 Timing Chart
This section of the service manual describes the timing that the computer industry recognizes as standard
for computer-generated video signals.
Table 2-1 Timing Chart
IBM VESA VESA(MJ17AS*/MJ17BS*/
(MJ15AS*/MJ15BS*/MJ17AS*/MJ17BS*/MJ19AS*/MJ19BS*) | © MJ19AS*/MJ19BS*)
Ven) | VGA | gaoyrs Hz | 800/60 Hz | 800/75 Hz | 1024/60 Hz | 1024/75 Hz | 1280/60 Hz | 1280/75 Hz
Timing 720 x 400 | 640 x 480 640 x 480 | 800x600 | 800x600 | 1024x 768 | 1024 x 768 | 1280 x 1024 | 1280 x 1024
fH (kHz) 31.469 31.469 37.500 37.879 46.875 48.363 60.023 63.981 79.975
A wsec 31.777 31.778 26.667 26.400 21.333 20.677 16.660 11.852 12.504
B usec 3.813 3.813 2.032 3.200 1.616 2.092 1.219 1.037 1.067
C usec 1.589 1.589 3.810 2.200 3.232 2.462 2.235 2.296 1.837
D psec 26.058 26.058 20.317 20.000 16.162 15.754 13.003 9.259 9.481
E sec 0.318 0.318 0.508 0.000 0.323 0.369 0.203 0.000 0.119
fV (Hz) 70.087 59.940 75.000 60.317 75.000 60.004 75.029 60.020 75.025
O msec 14.268 16.683 13.333 16.579 13.333 16.666 13.328 16.005 13.329
P msec 0.064 0.064 0.080 0.106 0.064 0.124 0.050 0.047 0.038
Q msec 0.858 0.794 0.427 0.607 0.448 0.600 0.466 0.594 0.475
R msec 13.155 15.761 12.800 15.840 12.800 15.880 12.795 15.630 12.804
S msec 0.191 0.064 0.027 0.0261 0.021 0.062 0.017 0.016 0.013
Clock
Freq. 28.322 26.175 31.500 40.000 49.500 75.000 78.750 | 108.000 | 135.000
(MHz)
Polarity
H.Synec Negative | Negative | Negative | Positive Positive | Negative | Positive Positive Positive
V.Syne Positive | Negative | Negative | Positive Positive | Negative | Positive Positive Positive
Remark Separate | Separate | Separate | Separate | Separate | Separate | Separate | Separate | Separate
Horizontal
Video
Separate Sync
Vertical
H/V Composite Sync
|| ar
‘woeo = LLL
B 0
soca
TT
Lee
a
Wn
—
I
|
|<
wl
»|
Sync-on-Green
Vertical ny rors
Gi
ec uv Ls U U
E: Front porch
S : Front porch
rife! |
~ >| [< Pel O lw >| nae]
A: Line time total B : Horizontal sync width 0 : Frame time total P : Vertical sync width
C: Back porch D : Active time Q: Back porch R : Active time
2-4
MJ15AS*/MJ17AS*/MJ19AS*/
MJ15BS*/MJ17BS*/MJ19BS*

3 Disassembly and Reassembly
This
section
of
the
service
manual
describes
the
disassembly
and
reassembly
procedures
for
the
MJ15AS*
/MJ17AS*/MJ19AS*
/MJ15BS*
/
MJ17BS*/MJ19BS*
TFT-LCD
monitors.
WARNING:
This
monitor
contains
electrostatically
sensitive
devices.
Use
caution
when
handling
these
components.
3-1 Disassembly
Cautions:1. Disconnect the monitor from the power source before disassembly.
After placing monitor on the cushioned table,
remove two screws on the left and right of the
bottom.
Disconnect back cover from monitor after
grabbing the right edge of the set (a) and
lifting the stand((2)).
Remove 2 screws from the shield.
Disconnect function cable from the cover front
and lift up the panel. Remove 4 screws from
the panel shield. (Right / Left)
Lift up the panel shield and carefully remove
the silicon glue on the cables with a nipper.
Caution : Lamp wire may be easily
damaged. Please use caution when removing
the silicon.
MJ15AS*/MJ17AS*/MJ19AS*/ 3-1
MJ15BS*/MJ17BS*/MJ19BS*

3 Disassembly and Reassembly
This
section
of
the
service
manual
describes
the
disassembly
and
reassembly
procedures
for
the
MJ15AS*
/MJ17AS*
/MJ19AS*/MJ15BS*/
MJ17BS*
/
MJ19BS*
TFT-LCD
monitors.
WARNING:
This
monitor
contains
electrostatically
sensitive
devices.
Use
caution
when
handling
these components.
3-1 Disassembly
Cautions: 1. Disconnect the monitor from the power source before disassembly.
2.
Follow
these
directions
carefully;
never
use
any
metal
instrument
except
provided
jig
to
separate
the
cabinet.
3. R/Cover opening jig : BH81-00001A
Place monitor face down on cushioned table.
Remove 4 screws from grip on the stand and
remove the stand. Remove 2 screws from the
rear cover.
Insert the opening stand into the grooves at a
hole and press until it clicks and lift the rear
cover.
Remove 2 screws from the shield.
Disconnect function cable from the cover front
and lift up the panel. Remove 4 screws from
the panel shield. (Right / Left)
Lift up the panel shield and carefully remove
the silicon glue on the cables with a nipper.
A\Caution : Lamp wire may be easily
damaged. Please use caution when removing
the silicon.
MJ15AS*/MJ17AS*/MJ19AS*/
MJ15BS*/MJ17BS*/MJ19BS*
3-1

3 Disassembly and Reassembly
Remove 7 screws, 4 hexa screws from the
boards and lift up the boards.
Z\ Caution : When repairing panel only,
disconnect just LVDS cable, Panel-Lamp /
Wire marked in circle in the picture without
removing the screws on board in order to lift
the board up.
7. This picture is panel.
3-2 Reassembly
Reassembly procedures are in the reverse order of disassembly procedures.
3-2 MJ15AS*/MJ17AS*/MJ19AS*/
MJ15BS*/MJ17BS*/MJ19BS*

4 Alignments and Adjustments
This section of the service manual explains how to use the RS232 JIG.
This function is needed for AD board change and program memory (C110) change.
4-1 Required Equipment
The following equipment is necessary for adjusting the monitor:
¢ Computer with Windows 95, Windows 98, or Windows NT.
¢ MTJ-2031 DDC MANAGER JIG
4-2 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.
4-3 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.
i (Monitor needing
adjustment
DDC
Manager
Parallel
Connector
sina
a
(25P
Cable)
gnial
©
Figure 1.
4-4 OSD Adjustment When Replacing Panel
1. Adjust brightness and contrast to 0. Then, press the k/](Enter/Source) key for 5 second.
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.
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.
MJ15AS*/MJ17AS*/MJ19AS*/ 4-1
MJ15BS*/MJ17BS*/MJ19BS*

4 Alignments and Adjustments
4-6 Service Function Spec.
er
a
hE
SS
Sf
TSS
4-6-1 How to Display Service Function OSD
1. The value for brightness and contrast should be changed to zero.
2. Within 5 seconds, press the k4] (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
Softward 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.
4-6-2 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
wou
from “Panel” to “Upper Lamp”, “Lower Lamp”.
Figure 3.
a
ee
a
oe
4-2
MJ15AS8*/MJ17AS*/MJ19AS*/
MJ15BS*/MJ17BS*/MJ19BS*

4 Alignments and Adjustments
4-6-3 How to Control Service Function OSD
¢ After change the panel or lamp, you must reset service function OSD.
¢The case of panel change
After changeing 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.
4-6-4 How to Control Service Function OSD
eIn the case of Upper Lamp or Lower Lamp change
After changeing 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.
MJ15AS*/MJ17AS*/MJ1SAS*/ 4-3
MJ15BS */MJ17BS*/MJ19BS*

4 Alignments and Adjustments
Memo
44
MJ15AS*/MJ17AS*/MJ19AS*/
MJ15BS*/MJ178S*/MJ19BS*

5 Troubleshooting
Notes: 1. Before troubleshooting, setup the PC’s display as below.
© Resolution: 1024 x 768
© H-frequency: 61 kHz
e \-frequency: 75 Hz
2. lf no picture appears, make sure the power cord is correctly connected.
3. Check the following circuits.
¢ No raster appears: Function PBA, Main PBA, |/D PBA
¢ 5V develop but no screen: Main PBA
¢ 5V does not develop: |/D PBA
4. If you push and hold the “[a\Enter, Source)” button for more than 5 seconds, the monitor automatically returns
to the factory preset.
5-1-1 No Power (MJ15A*/MJ15B*)
Check Function Ass'y.
Yes
Change IP Board.
When Pin 4 of CN600 is OV
does proper DC 13V, 5V
appear at Pin 1, 2 and 6, 7 of
CN600 separately?
When Pin 3 of IC602 is DC 5V
does proper DC 3.3V appear at
Check |C602 and related circuit. |
Pin 4 of IC602?
Yes
does proper DC 3.3V appear at Check IC600 and related circuit.
When Pin 4 of IC600 is DC 5V 5 |
Pin 5 and 6 of IC600?
‘
Yes
When Pin 2, 3 of IC601 is No
DC 3.3V does proper DC 4.3V Check IC601 and related circuit. |
appear at Pin 1 of IC601?
ar
Yes
DC 4.3V does proper DC 2.5V Check IC601 and related circuit.
When Pin 2, 3 of IC601 is 0 |
appear at Pin 4 of IC601?
Y
* QV means power on state.
When the monitor work well except DPMS and power switch off,
OV should be applied to number 4 of CN600.
MJ15AS*/MJ17AS*/MJ19AS*/ of
MJ15BS*/MJ17BS*/MJ19BS*

5 Troubleshooting
Notes: 1. Before troubleshooting, setup the PC’s display as below.
e Resolution: 1280 x 1024
e H-frequency: 64 kHz
e V-frequency: 60 Hz
If no picture appears, make sure the power cord is correctly connected.
wn
Check the following circuits.
¢ No raster appears: Function PBA, Main PBA, |/P PBA
e 5V develop but no screen: Main PBA
¢ 5V does not develop: I/P PBA
B
to the factory preset.
_
lf
you
push
and
hold
the
“[J\(Enter/Source)”
button
for
more
than
5
seconds,
the
monitor
automatically
returns
5-1-2 No Power (MJ17A*/MJ19A*/MJ17B*/MJ19B*)
| Check Function Ass’y.
Yes
Change IP Board.
When Pin 4 of CN600 is OV
does proper DC 13V, 5V
appear at Pin 1, 2 and 6, 7 of
CN600 separately?
Yes
When Pin 4 of 1C600 is DC 0.5V
does proper DC 0.5V appear at
Pin 5 and 6 of IC600?
Check IC600 and related circuit.
Yes
0
DC 3.3V does proper DC 4.3V Check IC601 and related circuit.
When
Pin
2,
3
of
IC601
is
N
|
appear
at
Pin
1
of
C601?
Yes
)
DC 4.3V does proper DC 2.5V Check IC601 and related circuit.
When
Pin
2,
3
of
IC601
is
N
|
appear
at
Pin
4
of
IC601?
* QV means power on state.
When the monitor work well except DPMS and power switch off,
OV should be applied to number 4 of CN600.
52
MJ15AS*/MJ17AS*/MJ19AS*/
MJ15BS*/MJ17BS*/MJ19BS*
:

5 Troubleshooting
5-2-1 No Video (ANALOG)
Check signal cable connection and power.
No
ER
=
X400
oscillate
properly?
Replace
or
check
related
circuit.
|
Yes
No
Is
there
R,
G,
B
input
at
R100,
Check
input
part.
R101 and R103?
Yes
Is there Hsync, Vsync waveform
Check IC400 and related circuit.
at Pin 100, 1 of IC 400?
Is there Hsync, Vsync waveform
No
Check 1C200 and related circuit.
No
Check 1C400 and related circuit.
Hw
at Pin 43, 44 of IC 200?
Does the output signal appear
at Pin 17~20, 22~27 of CN400?
Yes
There
are
DC
5V
at
Pin
1,
2
No
Check
the
panel
EN
signal
at
R222
|
and
3
of
CN400?
and
BL_EL
signal
at
R603.
es
Replace LCD Panel. |
MJ15AS*/MJ17AS*/MJ19AS*/
MJ15BS* /MJ17BS*/MJ19BS*
5-3

5 Troubleshooting
Tek SifEH 5.00GS/s ET 965 Acqs Tek SB 10.0MS/s eee
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C1 Fre dssebirean emasespetirsesectat tle aw) C1 Ere
ath 4 ro A, 43. 69338MH2 us cut 64 10s4skH2
| / ‘ ry 4 y Unstable
iF / histogram
iy jd C1 Pk Pk 4) Ct Pk-Pk
ly 2.88V 3.00V
j
i \ al i
| : ‘ CLRMS i CLRMS
i 1.524V i 2.736 V
| |
i i
Ch | a CCT M10.0ns CHT FS 1.-42V 17 oct 2037 Gm 100v MS.00ns Ch 7 T44V 47 Oct 2037
23:00:14 22:43:25
Tek MOTE 25.0kS/s 2 Acs
at LM oe
|
per inte ot ntaetiatteyntnh nt aaienrintinialenaprimentninpece| — Cl FTE
se i M- pattern =e sete,
; Unstable
| histogram
q 4 C1 Pk Pk
| 2.96 V
Lt Lee etl Ss fan CLRMS
: 2.742V
H
i
|
T.00V ——M200ms CATS” EAFV 17 Oct 2037
22:44:46
MJ15AS*/MJ17AS*/MJ19AS*/
MJ15BS*/MJ17BS*/MJ19BS*