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 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).
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
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.
RB17AS/RB17NS1-1
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.
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 devices are integrated circuits and some fieldeffect 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 wriststrap 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.
Left => 5W
– BASS Control Range : -12dB~ + 12dB
– TREBLE Control Range : -12dB~ + 12dB
A/V => 10mW max (580 Vrms), Max Input sound: -9dBm
– Output Frequency (TBD) : RF => 80 Hz ~ 15 kHz
A/V => 80 Hz ~ 20 kHz
RB17AS/RB17NS2-1
2-2 Pin Assignments
Sync
Type
Pin No.
Separate H/VComposite H/V
Sync-on-green
Pin No.
10
11
12
13
14
15
1
2
3
4
5
6
7
8
9
Sync
Type
Red
Green
Blue
GND
GND (DDC Return)
GND-Red
GND-Green
GND-Blue
No Connection
GND-Sync./Self Test
GND
DDC Data
Horizontal sync.
Vertical sync.
DDC Clock
DTV 15pin connector
Red
Green
Blue
GND
GND (DDC Return)
GND-Red
GND-Green
GND-Blue
No Connection
GND-Sync./Self Test
GND
DDC Data
H/V-Sync.
Not Used
DDC Clock
Red
Green + H/V Sync.
Blue
GND
GND (DDC Return)
GND-Red
GND-Green
GND-Blue
Not Used
GND-Sync./Self Test
GND
DDC Data
Not Used
Not Used
DDC Clock
10
11
12
13
14
15
1
2
3
4
5
6
7
8
9
Red , Y
Green , Pb
Blue , Pr
GND
GND
GND-Red
GND-Green
GND-Blue
GND
No Connection
GND
No Connection
Horizontal sync.
Vertical sync.
No Connection
2-2RB17AS/RB17NS
2-3 Timing Chart
Timing No.
Originator
Mode Name
Resolution (HxV)
1
IBM
VGA1
640x350
2
IBM
VGA2
720x400
3
IBM
VGA3
640x480
11
VESA
640/72Hz
640x480
17
VESA
640/75Hz
640x480
HORIZONTAL
Frequency
Total time
Active time
Blank time
Border (L / R)
Data time
Front porch
Sync. width
Back porch
Sync. polarity
31.469kHz
31.778µs
26.058µs
5.720µs
0.318µs
25.422µs
0.318µs
3.813µs
1.589µs
Positive
31.469kHz
31.777µs
26.058µs
5.720µs
0.318µs
25.422µs
0.318µs
3.813µs
1.589µs
Negative
31.469kHz
31.788µs
26.058µs
5.720µs
0.318µs
25.422µs
0.318µs
3.813µs
1.589µs
Negative
37.861kHz
26.413µs
20.825µs
5.588µs
0.254µs
20.317µs
0.508µs
1.270µs
3.810µs
Negative
37.500kHz
26.667µs
20.317µs
6.350µs
0.000µs
20.317µs
0.508µs
2.032µs
3.810µs
Negative
VERTICAL
Frequency
Total time
Active time
Blank time
Border (T / B)
Data time
Front porch
Sync. width
Back porch
Sync. polarity
HORIZONTAL
Frequency
Total time
Border (L / R)
Data time
Front porch
Sync. width
Back porch
Sync. polarity
33.750kHz
29.630
µs
0.000
µs
25.859
µs
0.593
µs
0.593
µs
2.586
µs
-
-
45.000kHz
22.222
µs
0.000
µs
17.239
µs
0.943
µs
0.539
µs
3.502
µs
-
31.469kHz
31.778
µs
0.000
µs
26.667
µs
0.593
µs
2.333
µs
2.185
µs
-
VERTICAL
Frequency
Total time
Border (T / B)
Data time
Front porch
Sync. width
Back porch
Sync. polarity
30Hz
33.333ms
0.000ms
0.059ms
0.148ms
0.444ms
-
60Hz
16.667ms
0.000ms
16.000ms
0.111ms
0.111ms
0.444ms
-
60Hz
16.683ms
0.000ms
15.349ms
0.191ms
0.191ms
0.953ms
-
Dot Clock75MHz75MHz27MHz
2-4 DTV Timing Chart
Table 2-2. DTV Timing chart
2-6RB17AS/RB17NS
3 Disassembly and Reassembly
This section of the service manual describes the disassembly and reassembly procedures for the
RB17AS/17NS 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.
3-1 General Alignment Instuction
1. Usually, a color TV-VCR needs only slight
touch-up adjustment upon installation.
Check the basic characteristics such as height,
horizontal and vertical sync.
2. Use the specified test equipment or its
equivalent.
3. Correct impedance matching is essential.
4. Avoid overload. Excessive signal from a
sweep generator might overload the front-end
of the TV. When inserting signal markers,
do not allow the marker generator to distort
test result.
3-2 Replacement Order of Lamp Assemblies
5. Connect the TV only to an DC power source
with voltage and frequency as specified on
the backcover nameplate.
6. Do not attempt to connect or disconnect any
wire while the TV is turned on. Make sure
that the power cord is disconnected before
replacing any parts.
7. To protect aganist shock hazard,use an
isolation transform.
1. After confirm there is nothing
on the desk
Turn the LCD module over
and put it on a flat desk set to
the ground.
RB17AS/RB17NS3-1
3 Disassembly and Reassembly
2. Push down the stopper and
slide the lamp unit.
3. Please take out the lamp
units from the LCD module.
4. Please fix the new lamp
units on the LCD module :
opposite process 2 and 3
* Replacement of lamp unit should be done at the power off state and recommended clean bench
condition.
3-3 Reassembly
Reassembly procedures are in the reverse order of Disassembly procedures.
3-2RB17AS/RB17NS
4 Alignments and Adjustments
4-1 General Alignment Instuction
1. Usually, a color TV-VCR needs only slight touch-up adjustment upon installation.
Check the basic characteristics such as height, horizontal and vertical sync.
2. Use the specified test equipment or its equivalent.
3. Correct impedance matching is essential.
4. Avoid overload. Excessive signal from a sweep generator might overload the front-end
of the TV. When inserting signal markers,do not allow the marker generator to distort
test result.
5. Connect the TV only to an DC power source with voltage and frequency as specified on
the backcover nameplate.
6. Do not attempt to connect or disconnect any wire while the TV is turned on. Make sure
that the power cord is disconnected before replacing any parts.
7. To protect aganist shock hazard,use an isolation transform.