Follow these safety, servicing and ESD precautions to prevent damage and to protect against potential hazards such as
electrical shock.
1-1-1. Warnings
For continued safety, do not attempt to modify the circuit board.
1.
Disconnect the AC power and DC power jack before servicing.
2.
1-1-2. Servicing the LCD Monitor
When servicing the LCD Monitor, Disconnect the AC line cord from the AC outlet.
1.
It is essential that service technicians have an accurate voltage meter available at all times. Check the calibration of
2.
this meter periodically.
1-1-3. Fire and Shock Hazard
Before returning the monitor to the user, perform the following safety checks:
Inspect each lead dress to make certain that the leads are not pinched or that hardware is not lodged between the
1.
chassis and other metal parts in the monitor.
Inspect all protective devices such as nonmetallic control knobs, insulating materials, cabinet backs, adjustment and
2.
compartment covers or shields, isolation resistorcapacitor networks, mechanical insulators, etc.
Leakage Current Hot Check (Figure 1-1):
3.
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
DEVICE
UNDER
TEST
TEST ALL
EXPOSED METAL
SURFACES
2-WIRE CORD
*ALSO TEST WITH
PLUG REVERSED
(USING AC ADAPTER
PLUG AS REQUIRED)
With the unit completely reassembled, plug the AC line cord directly into a 120V AC outlet. With the unit’s AC switch
4.
LEAKAGE
CURRENT
TESTER
EARTH
GROUND
Figure 1-1. Leakage Current Test Circuit
rst 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 identied 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, re and/or other hazards. Product safety is under review continuously and new instructions are issued whenever
appropriate.
1-1
Page 5
1-2
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 conict between the following servicing precautions and any of the
safety precautions, always follow the safety precautions.
1-2-1 General Servicing Precautions
Always unplug the unit’s AC power cord from the AC power source and disconnect the DC Power Jack before
1.
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.
Some components are raised above the printed circuit board for safety. An insulation tube or tape is sometimes
2.
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
3.
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,
4.
input terminals and earphone jacks).
Insulation Checking Procedure: Disconnect the power cord from the AC source and turn the power switch ON.
5.
Connect an insulation resistance meter (500 V) to theblades 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;
6.
always remove the instrument’s ground lead last.
1-3. Static Electricity 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 eld-effect
transistors. The following techniques will reduce the incidence of component damage caused by static electricity.
Immediately before handling any semiconductor components or assemblies, drain the electrostatic charge from your
1.
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.
After removing an ESD-equipped assembly, place it on a conductive surface such as aluminum foil to prevent
2.
accumulation of an electrostatic charge.
Do not use freon-propelled chemicals. These can generate electrical charges sufcient to damage ESDs.
3.
Use only a grounded-tip soldering iron to solder or desolder ESDs.
4.
Use only an anti-static solder removal device. Some solder removal devices not classied as “anti-static” can generate
5.
electrical charges sufcient to damage ESDs.
Do not remove a replacement ESD from its protective package until you are ready to install it. Most replacement ESDs
6.
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
7.
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,
8.
or lifting your foot from a carpeted oor can generate enough static electricity to damage an ESD.
Page 6
1. Precautions
1-4. Installation Precautions
For safety reasons, more than two people are required for carrying the product.
1.
Keep the power cord away from any heat emitting devices, as a melted covering may cause re or electric shock.
2.
Do not place the product in areas with poor ventilation such as a bookshelf or closet. The increased internal
3.
temperature may cause re.
Bend the external antenna cable when connecting it to the product. This is a measure to protect it from being exposed
4.
to moisture. Otherwise, it may cause a re or electric shock.
Make sure to turn the power off and unplug the power cord from the outlet before repositioning the product. Also check
5.
the antenna cable or the external connectors if they are fully unplugged. Damage to the cord may cause re or electric
shock.
Keep the antenna far away from any high-voltage cables and install it rmly. Contact with the highvoltage cable or the
6.
antenna falling over may cause re or electric shock.
When installing the product, leave enough space (10cm) between the product and the wall for ventilation purposes.
7.
A rise in temperature within the product may cause re.
1-3
Page 7
1. Precautions
Memo
1-4
Page 8
2. Product specications
2-1. Feature & Specications
Model2032BW / 2232BW
Feature
Minimalism Design Something New
�
Boltless Model (Clean Cut & Soft Surface)
�
New Ball Hinge
�
Fast Response Time
�
Dynamic Contrast
�
Specications
ItemDescription
Model2032BW2232BW
LCD PanelTFT-LCD panel, RGB vertical stripe, normally white transmissive,
2. Product specications
20-Inch viewable, 0.258 (H) x 0.258 (V)
mm pixel pitch
Horizontal/Vertical459.4(H) x 296.4(V)459.4(H) x 296.4(V)
AC power voltage & Frequency AC 110V~130V, 60Hz & AC, 200V~240V 50Hz
Power Consumption45 W (Max)50 W (Max)
Dimensions
Set (W x D x H)476 x 344 x 70 mm (With Stand)517 x 372 x 70 mm (With Stand)
Weight (Set)4.4 kg4.5 kg
20-Inch viewable, 0.27675 (H) x 0.27675
(V) mm pixel pitch
Environmental ConsiderationsOperating 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%
Note: Designs and specications are subject to change without prior notice.
2-1
Page 9
2-2
2. Product specications
2-2. Spec Comparison to the Old Models
ModelPebble (2032BW/2232BW)Pebble (206BW/226BW)
Design
Resolution1680 x 10501680 x 1050
InputD-Sub, DVI-DD-Sub
Response Time2ms(G to G)2ms(G to G)
Viewing Angle 160/160(CR=10)160/160(CR=10)
Brightness300cd/m²300cd/m²
Contrast1000:1700:1
MagicBright 6 step6 step
PivotXX
Wall mountXX
Feature
Magic Color
Magic Bright3
Magic Tune (Premium)
Magic Color
Magic Bright3
Magic Tune(Premium)
Page 10
2-3. Accessories
ProductDescriptionCcde. NoRemark
2. Product specications
Quick Setup GuideBH68-00376L
Warranty Card
(Not available in all locations)
User’s Guide,
Monitor Driver
D-Sub(15 Pin) CableBN39-00244A
Power Cord3903-000042
2-4. Accessories (Sold separately)
ProductDescriptionCcde. NoRemark
DVI-D CableBN39-00246F
BH68-00633A
BN59-00585T
Samsung Electronics
Service center
Samsung Electronics
Service center
2-3
Page 11
2. Product specications
Memo
2-4
Page 12
3. Disassembly and Reassemble
3. Disassembly and Reassemble
This section of the service manual describes the disassembly and reassembly procedures for the LS57BPP LCD monitor.
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 metal instruments to pry apart the cabinet.
DescriptionPicture DescriptionScrews
1. Placeasoftclothontheoorandplacethe
monitor on it so that the front of the monitor is on
the cloth. Lean the top of the stand backwards
until it is at an angle of 5° to 10° and hold and
push the top of the monitor downwards.
Caution: If you try to forcefully remove the monitor
without leaning the stand backwards, the
connecting pin may break. Be careful.
Fragile: Do not break
5° to 10°
2. Turn the monitor so the front section is facing
upwards. Remove the marked parts from the
frontcover,asshowninthegurebelow.
3. Remove the marked part from the top edge of
thefrontcover,asshowninthegurebelow.
4. Remove the marked parts from both sides of the
frontcover,asshowninthegurebelow.
3-1
Page 13
3-2
3. Disassembly and Reassemble
DescriptionPicture DescriptionScrews
5. Remove the marked part from the front cover, as
showninthegurebelow.
Caution: Do not lift the front cover over position (1),
which may cause damage to it.
6. Turn the monitor so the back of it is facing
upwards. Lift up and remove the back cover.
(A)
7. Use the jig to remove the shield lamp.
(Be careful Shield.)
8. Disconnect cables.
(LVDS, INVERTER and FUNCTION cable)
9. Lift up the LCD panel.
LVDS
INVERTER
FUNCTION
Page 14
DescriptionPicture DescriptionScrews
10. Remove 4 screws.
11. Remove 5 screws and Lift up the Bracket
Support.
3. Disassembly and Reassemble
Bracket Support
12. Lift up the Main PCB and IB Board.
13. Main PCB and IB Board.
Reassembly procedures are in the reverse order of disassembly procedures.※
4. Turn the stand so mark on the connecting pin is facing
the front.
5. Check the connecting part between the monitor and the
stand.
6. Tilt the monitor upwards at an angle of 5 ° to 10° so that the
base is closer to you than the top. Then hold the monitor on
the stand by its top parts and push them downwards.
3. Disassembly and Reassemble
(You can assemble it more easily by pushing it down while
wriggling it a little to the left and right.)
7. When the monitor is assembled correctly, the straight
groove line at the back of the connecting pin will not be
visible when the monitor is erected at 90°.
3-5
Page 17
3. Disassembly and Reassemble
3-2-2. Removing the Stand
DescriptionPicture Description
1. Place a soft cloth or cushion on the table and place the
monitor with the front facing downwards.
2. Hold the monitor and lean the stand upwards.
3. Hold the monitor, and then twist the stand strongly to the
left and pull it out.
4. Stand the screw handles up and unfasten the screws by
turning them.
5. Remove the connecting pin from the stand.
3-6
Page 18
4. Troubleshooting
4-1. Troubleshooting
1.
Before troubleshooting, setup the PC ‘s display as below.
• Resolution: 1280 x 1024
• H-frequency: 65 kHz
• V-frequency: 60 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 select Brightness adjust menu and push the “
returns to factory reset.
(Enter/Source)” button for 5 seconds, the monitor automatically
4. Troubleshooting
4-1
Page 19
4. Troubleshooting
4-2. No Power
Symptom
Major
checkpoints
-
-
-
-
When turning on the Power button after connecting the power, the LED at the front of the
monitor does not operate.
Check the IP board power fuse and the IP board output power.
Check the connections for the IP board and the Main board inside the monitor.
Check the Main board power part and check also whether there is any abnormal output at other
output terminals.
Main Board Front
Diagnostics
When Pin 4 of CN600 is 0V,
Does proper DC 14V appear at pin 5 of
CN600?
Yes
When Pin 1 of IC 702 is DC 14V,
Does proper DC5V appear at pin1 of
IC601
Yes
When pin 1 of IC 601 is DC 5V,
Proper DC 3.3V appear at pin 3 of IC
601
Yes
When pin 3 of IC 602 is DC 5V,
Proper DC 1.8V appear at pin 2 of IC
602
CautionMake sure to disconnect the power before working on the IP board.
Yes
No
No
No
No
Check function assy.
Replace IP board.
Check IC 701 and related
circuit.
Check IC 601 and related
circuit.
Check IC 602 and related
circuit.
4-2
Page 20
4-3. No Video (Analog)
Symptom-Though the LED power turns on, the screen is blank when connecting the VGA cable.
4. Troubleshooting
Major
checkpoints
- Check the D-sub cable connections.
- Check whether the LVDS cable is connected correctly to the panel.
- Check whether the lamp connector of the panel is connected correctly to the IP board.
Main Board Front
Check signal cable connection
and power.
Yes
Diagnostics
CautionMake sure to disconnect the power before working on the IP board.
1
Is there Hsync, Vsync waveform at Pin
3
2
X1 oscillate proprely?
Yes
Is there R,G,B input at
R111,R114 and R118?
Yes
32,33 of IC200?
Yes
Does the output signal appear
at Pin 17~20, 22~27 of CN400?
Yes
There are DC 5V at Pin 1,
2 and 3 of CN400?
Yes
Replace LCD Panel.
No
No
No
No
No
Replace or check related
circuit.
Check input part.
Check IC200 and related
circuit.
Check CN400 and related
circuit.
Check PANEL_EN SIGNAL
at R223 is High(On:High) and
BL_EN signal at R601(ON:
Low) is Low
4-3
Page 21
4. Troubleshooting
4-3-1. Circuit diagrams and waveforms (Analog) when no screen is displayed
on the monitor
1
3
2
4-4
Page 22
4-4. No Video (DVI)
Symptom- The LED power turns on but the screen is blank when the DVI cable is connected.
4. Troubleshooting
Major
checkpoints
Diagnostics
- Check the DVI cable connections.
- Check whether the LVDS cable is connected correctly to the panel.
- Check whether the lamp connector of the panel is connected correctly to the IP board.
Main Board Front
Check signal cable connection
and power.
Yes
1
4
5
6
CautionMake sure to disconnect the power before working on the IP board.
X1 oscillate properly?
Yes
Is there R, G, B input at
R100,R101,R102,R106
and R108?
Yes
Does the output signal appear
at Pin 17~20, 22~27 of CN400?
Yes
There are DC 5V at Pin 1,
2 and 3 of CN400?
Yes
Replace LCD Panel.
No
No
No
No
Check the PANEL_EN signal
at R222 and BL_EN signal at
Replace or check related
circuit.
Check input part.
Check IC400 and related
circuit.
R603.
4-5
Page 23
4. Troubleshooting
4-4-1. Circuit diagrams and waveforms (DVI) when no screen is displayed on
the monitor
14
56
4-6
Page 24
4-5. Faults and Corrective Actions
Fault Photo Symptoms and Corrective ActionsRemarks
Symptoms: DVI signals are not recognized.
Causes: This fault occurs when the PC does not
recognize the mode information because
the DVI DDC has not been input to the
monitor.
Corrective Actions: Input the DVI DDC to the monitor.
* Refer to the Training Manual for
information on inputting the DVI
DDC.
4. Troubleshooting
Symptoms: When the monitor is turned on, only a
full white pattern is displayed continually
regardless of the signals.
Causes:
Corrective Actions: Replace or reconnect the LVDS
This fault occurs when only the lamp
power is supplied and no video signals are
input to the panel due to a fault or incorrect
connections of the LVDS cable.
cable correctly so that video
signals can be supplied to the
panel.
* A
full white pattern is a feature of the
TN panel and is displayed when no
video signals are supplied.
4-7
Page 25
4. Troubleshooting
4-6. Adjustment
4-6-1. Service Adjustment Conditions
Precautions before starting Service Adjustments
1.
1) Check whether the adjustment devices are working correctly.
2) Ensure a sufcient work space for disassembling the monitor.
3) Prepare a soft support for disassembling the monitor.
Entering Service Mode
2.
Entering:Menu
Exiting:Power OFFPower ON
3.
Basic Service Items to perform after Replacing a Board
1) Check the state of the PC color adjustment.
2) Enter the DDC data. (Enter both analog and digital data.)
3) Check whether the MCU code that corresponds to the model has been entered.
4) After completing your work in service mode, reset the monitor and switch it off.
4.
How to execute DDC
1) Enter the DDC EDID data when the AD board is replaced.
Download the DDC input program and the DDC le that corresponds to the model from the Quality Department of
2)
Samsung and install it using a jig as shown in the gure below, and then enter the data.
Brightness 0Contrast 0
Parallel
Connector
(25P Cable)
Hold down the Enter button for ve seconds
MTI-2031
DDC
Connect Monitor
(Signal Cable)
4-8
Page 26
4-6-2. Service Function Spec.
Service Mode (Entering)
1. Set both the brightness and contrast to 0.
2. Hold down the <Button>(Enter, Source) button for ve (5) seconds.
3. The SVC Function OSD will appear.
- To exit the SVC Function OSD, you have to turn off the power.
Panel Information
MCU Version
Checksum
The SVC Function OSD consists of a 29 (width) X 12 (height) grid.
The SVC Function OSD shows the information, software version and Micom checksum.
4. Troubleshooting
Service Mode (Moving around)
1. Each time the + button is pressed, menu is selected. Then, you can adjust sub menu with - button
4-9
Page 27
4. Troubleshooting
Service Mode (Replacing the Panel)
- When replacing the panel
After replacing the panel, select the Panel item and then hold down the Menu button for ve (5) seconds.
The Ch. No. of the panel will increase by one (1) and the time information will change to 0.
Service Mode (Hot plug Menu)
- HDCP Hotplug : used when HDCP Video contents are not displayed. In case that monitor is connected to some bad
device which does not comply with standard.
- HotPlug Time : If Hotplug is turn on, when monitor power off/on or changing to the DVI, hotplug pin goes to the low. This
function controls this time duration.
Though Hotplug is turn on monitor can’t displayed, adjust this time duration
- Default is 9(means 0.9 sec), can control 5 to 50.
4-10
Page 28
How to execute DDC
1
4. Troubleshooting
2
3
4
5
1) Click the Open icon
2) Select Two EDID
3) Select a DDC le.
4) Select week
5) Click Next (OK).
6
6) Enter the serial number and press the Enter key.
After entering the analog data, repeat the procedure above 2 to 5 times to enter digital data.
※
4-11
Page 29
4. Troubleshooting
How to Execute MCU Code
1
1) Options Checking.
-. Manufacture : MSTAR
-. Device Type:TSUM16_ROM128K_ext_ash
-. Communication Port: DSUB15 (Analog)
-. External Memory: PMC25LV010E
2
2) After click the ‘LoadFile’ button , choose MCU code.
4-12
Page 30
4. Troubleshooting
3
3) ‘Auto Program’ button choice.
4) After the Program and Verify completed, execute hard power off/on.