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NK15A*/NK17A*
Service Manual
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CONFIDENTIAL
TFT-LCD TV/MONITOR
NK15A*/NK17A*
SERVICE Manual
TFT-LCD TV/MONITOR CONTENTS
1. Precautions
2. Product Specifications
3. Disassembly & Reassembly
4. Alignment & Adjustments
5. Troubleshooting
6. Exploded View & Parts List
7. Electrical Parts List
8. Block Diagram
9. Wiring Diagram
10. Schematic Diagrams
11. Panel Description
CONFIDENTIAL
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
(READING SHOULD
circuit board. NOT BE ABOVE 0.5mA)
2. Disconnect the AC power and DC Power Jack
before servicing. DEVICE
LEAKAGE
CURRENT
UNDER TESTER
1-1-2 Servicing the LCD Monitor TEST
TEST ALL
EXPOSED METAL
1. When servicing the LCD Monitor Disconnect the SURFACES
AC line cord from the AC outlet.
2-WIRE CORD
2. It is essential that service technicians have an
accurate voltage meter available at all times. Check
the calibration of this meter periodically. ALSO TEST WITH
PLUG REVERSED
(USING AC ADAPTER
PLUG AS REQUIRED) EARTH
1-1-3 Fire and Shock Hazard GROUND
Before returning the monitor to the user, perform the Figure 1-1. Leakage Current Test Circuit
following safety checks:
1. Inspect each lead dress to make certain that the 4. With the unit completely reassembled, plug the AC
leads are not pinched or that hardware is not line cord directly into a 120V AC outlet. With the
lodged between the chassis and other metal parts in unit's AC switch first in the ON position and then
the monitor. OFF, measure the current between a known earth
2. Inspect all protective devices such as nonmetallic ground (metal water pipe, conduit, etc.) and all
control knobs, insulating materials, cabinet backs, exposed metal parts, including: metal cabinets,
adjustment and compartment covers or shields, screwheads and control shafts. The current
isolation resistor-capacitor networks, mechanical measured should not exceed 0.5 milliamp. Reverse
insulators, etc. the power-plug prongs in the AC outlet and repeat
3. Leakage Current Hot Check (Figure 1-1): the test.
WARNING: Do not use an isolation transformer during
this test. 1-1-4 Product Safety Notices
Use a leakage current tester or a metering system
Some electrical and mechanical parts have special
that complies with American National Standards
safety-related characteristics which are often not
Institute (ANSI C101.1, Leakage Current for
evident from visual inspection. The protection they give
Appliances), and Underwriters Laboratories (UL may not be obtained by replacing them with
Publication UL1410, 59.7). 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.
NK15A*/NK17A* 1-1
1 Precautions
CONFIDENTIAL
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 4. Check the insulation between the blades of the AC
AC power source and disconnect the DC Power plug and accessible conductive parts (examples:
Jack before attempting to: metal panels, input terminals and earphone jacks).
(a) remove or reinstall any component or assembly, 5. Insulation Checking Procedure: Disconnect the
(b) disconnect PCB plugs or connectors, (c) connect power cord from the AC source and turn the power
a test component in parallel with an electrolytic switch ON. Connect an insulation resistance meter
capacitor. (500 V) to the blades of the AC plug.
2. Some components are raised above the printed The insulation resistance between each blade of the
circuit board for safety. An insulation tube or tape AC plug and accessible conductive parts (see
is sometimes used. The internal wiring is above) should be greater than 1 megohm.
sometimes clamped to prevent contact with
6. Always connect a test instrument's ground lead to
thermally hot components. Reinstall all such
the instrument chassis ground before connecting
elements to their original position.
the positive lead; always remove the instrument's
3. After servicing, always check that the screws, ground lead last.
components and wiring have been correctly
reinstalled. Make sure that the area around the
serviced part has not been damaged.
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 devices 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 6. Do not remove a replacement ESD from its
components or assemblies, drain the electrostatic protective package until you are ready to install it.
charge from your body by touching a known earth Most replacement ESDs are packaged with leads
ground. Alternatively, wear a discharging wrist- that are electrically shorted together by conductive
strap device. To avoid a shock hazard, be sure to foam, aluminum foil or other conductive materials.
remove the wrist strap before applying power to 7. Immediately before removing the protective
the monitor. material from the leads of a replacement ESD,
2. After removing an ESD-equipped assembly, place it touch the protective material to the chassis or
on a conductive surface such as aluminum foil to circuit assembly into which the device will be
prevent accumulation of an electrostatic charge. installed.
3. Do not use freon-propelled chemicals. These can Caution: Be sure no power is applied to the
generate electrical charges sufficient to damage chassis or circuit and observe all
ESDs. other safety precautions.
4. Use only a grounded-tip soldering iron to solder or
desolder ESDs. 8. Minimize body motions when handling
unpackaged replacement ESDs. Motions such as
5. Use only an anti-static solder removal device. Some brushing clothes together, or lifting your foot from
solder removal devices not classified as "anti-static" a carpeted floor can generate enough static
can generate electrical charges sufficient to damage electricity to damage an ESD.
ESDs.
1-2 NK15A*/NK17A*
CONFIDENTIAL
2 Product Specifications
2-1 Specifications
Description
Item
NK15A* NK17A*
LCD Panel TFT-LCD panel, RGB vertical stripe, normaly TFT-LCD panel, RGB vertical stripe, normaly
white, 15-Inch viewable, 0.261 mm pixel pitch white, 17-Inch viewable, 0.2895 mm pixel pitch
Scanning Frequency Horizontal : 30 kHz ~ 61 kHz (Automatic)
Vertical : 56 Hz ~ 75 Hz (Automatic)
Display Colors 16.2 Million colors
Maximum Resolution Horizontal : 1280 Pixels 1280 Pixels
Vertical : 768 Pixels 768 Pixels
Input Video Signal Analog 0.7 Vp-p ± 5% positive at 75 , internally terminated
Input Sync Signal Type : Seperate H/V
Level : TTL level
Maximum Pixel Clock rate 80 MHz 80 MHz
Active Display
334.08 mm / 200.44 mm 370.560 mm / 222.336 mm
Horizontal/Vertical
AC power voltage & Frequency AC 90 ~ 264 Volts, 60 / 50 Hz ± 3 Hz
Power Consumption 50 W (Max) 53 W (Max)
Dimensions
Unit (W x D x H) 19.6 x 8.0 x 14.7 Inches (498 x 204.5 x 374 mm) 21.1 x 8.0 x 15.8 Inches (536 x 204.5 x 402 mm)
Carton (W x D x H) 22.5 x 17.4 x 10.6 Inches (571 x 441 x 269 mm) 24.0 x 18.3 x 10.6 Inches (609 x 465 x 269 mm)
Weight 3.95 Kg (8.7 Ibs) 4.8 Kg (10.6 Ibs)
Environmental Considerations Operating Temperature : 50 °F ~ 104 °F (10 °C ~ 40 °C)
Humidity : 10 % ~ 80 %
Storage Temperature : -4 °F ~ 113 °F (-20 °C ~ 45 °C)
Humidity : 5 % ~ 95 %
Tunning Frequency Synthesize
TV System System PAL, SECAM, NTSC 4.4
Sound BG, DK, I, L, L'
Antena Input 75, Coaxial Cable
MAX Internal speaker Out : Right => 3W Right => 5W
Left => 3W Left => 5W
Sound Characteristic
BASS Control Range : -12 dB~ + 12 dB
TREBLE Control Range : -12 dB~ + 12 dB
Headphone Out: 5mW max (400m Vrms)
Output Frequency : RF => 80 Hz ~ 15 kHz
A/V => 80 Hz ~ 15 kHz
NK15A*/NK17A* 2-1
2 Product Specifications
CONFIDENTIAL
2-2 Pin Assignments
2-2-1 D-SUB 2-2-2 SCART1, SCART2
Pin Separate Pin Items Scart1 Scart2
No
1 Red 1 Audio Out (R;500mV/1K) O O
2 Green 2 Audio IN (R;500mV/10K) O O
3 Blue 3 Audio Out (L;500mV/1K) O O
4 GND 4 Audio Common GND O O
5 GND (DDC Return) 5 Blue GND O O
6 GND-Red 6 Audio IN (L;500mV/10K) O O
7 GND-Green 7 Blue IN (700mV/75) O
8 GND-Blue
Function S/W
9 No Connection 8 O O
(0~2V/9, 5V~12V)
10 GND-Sync./Self Test 9 Green GND O O
11 GND 10 No Connection O
12 DDC Data
11 Green IN (700mV/75) O
13 H-Sync.
12 No connection O
14 V-Sync.
13 Red GND O O
15 DDC Clock
14 F/B GND O O
15 Red IN (700mV/75) O
16 RGB F/B (0~0, 4V/1~3V) O
17 Video Output GND O O
18 Video Input GND O O
19 CVBS Out (1V/75) O O
20 CVBS IN (1V/75) O O
21 Common GND O O
2-2-3 S-Video 2-2-4 A/V
Pin Separate RCA Yellow CVBS
1 GND Audio L
2 Y RCA White
3 C GND
4 GND
Audio R
5 GND RCA Red
GND
2-2 NK15A*/NK17A*
2 Product Specifications
CONFIDENTIAL
2-3 Timing Chart
This section of the service manual describes the timing that the computer industry recognizes as standard
for computer-generated video signals.
2-3-1 LCD Panel Mode : 1 mode
µs
µs
µs
µs
µs
µs
µs
µs
NK15A*/NK17A* 2-3
2 Product Specifications
CONFIDENTIAL
2-3-2 Supported Modes (1)
µs µs µs µs µs
µs µs µs µs µs
µs µs µs µs µs
µs µs µs µs µs
µs µs µs µs µs
µs µs µs µs µs
µs µs µs µs µs
µs µs µs µs µs
2-4 NK15A*/NK17A*
2 Product Specifications
CONFIDENTIAL
2-3-2 Supported Modes (2)
µs µs µs µs µs
µs µs µs µs µs
µs µs µs µs µs
µs µs µs µs µs
µs µs µs µs µs
µs µs µs µs µs
µs µs µs µs µs
µs µs µs µs µs
NK15A*/NK17A* 2-5
2 Product Specifications
CONFIDENTIAL
2-3-2 Supported Modes (3)
µs µs
µs µs
µs µs
µs µs
µs µs
µs µs
µs µs
µs µs
2-6 NK15A*/NK17A*
CONFIDENTIAL
3 Disassembly and Reassembly
This section of the service manual describes the disassembly and reassembly procedures for the
NK15A*/NK17A* 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 5. Connect the TV only to an DC power source
with voltage and frequency as specified on
1. Usually, a color TV-VCR needs only slight the backcover nameplate.
touch-up adjustment upon installation.
6. Do not attempt to connect or disconnect any
Check the basic characteristics such as height,
wire while the TV is turned on. Make sure
horizontal and vertical sync.
that the power cord is disconnected before
2. Use the specified test equipment or its replacing any parts.
equivalent.
7. To protect aganist shock hazard,use an
3. Correct impedance matching is essential. isolation transform.
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
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.
NK15A*/NK17A* 3-1
3 Disassembly and Reassembly
CONFIDENTIAL
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.
3-2 NK15A*/NK17A*
CONFIDENTIAL
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.
NK15A*/NK17A* 4-1
4 Alignments and Adjustments
CONFIDENTIAL
4-2 Factory Mode Adjustments
4-2-1 Entering Factory Mode
1. To enter "Service Mode" Press the remote - control keys in this sequence :
- If you do not have Factory remote - control
- If you have Factory remote - control
4-2-2 Factory Mode Tree
4-2 NK15A*/NK17A*
4 Alignments and Adjustments
CONFIDENTIAL
NK15A*/NK17A* 4-3
4 Alignments and Adjustments
CONFIDENTIAL
Memo
4-4 NK15A*/NK17A*
CONFIDENTIAL
5 Troubleshooting
5-1 No Power
Does proper DC 14V appear at DC No
Check SMPS PCB and Adapter.
jack connected to CN801?
Yes
Does proper DC 3.3V_A No
1 Check IC801. (#2)
appear at FT852?
Yes
Does proper DC 2.5V_A No
Check IC802.
appear at Pin 3 of IC802?
Yes
Does proper DC 3.3V_B No
2 Check IC805. (#1)
appear at FT822?
Yes
Does proper DC 2.5V_B No
Check IC806.
appear at Pin 3 of IC806?
WAVEFORMS
1 IC801 #2 2 IC805 #1
NK15A*/NK17A* 5-1
5 Troubleshooting
CONFIDENTIAL
5-2 No Video (PC Signal)
Power indicator is green.
Yes
Does the signal appear No
3 at C306, C398, C397 Check CN401 and cable.
of R, G, B input?
Yes
Does the clock pulse appear at No
Check related circuit of IC350.
output of RA351 ~ RA356?
Yes
Does the clock pulse No Check R354 and related
appear at R354? circuit of R354.
Yes
Does the clock pulse No Check X201 and related
4
appear at X201? circuit of X201.
Yes
Does the clock pulse appear at No
Replace RA301 ~ RA306, IC300.
output of RA301~RA306?
Yes
Replace LCD Panel.
WAVEFORMS
3 Full White R, G, B Input (C306, 398, 397) 4 X201
5-2 NK15A*/NK17A*
5 Troubleshooting
CONFIDENTIAL
5-3 No Picture (TV, Video, S-Video, SCART)
Check the CO44, CO45(S-Video),
CO46(VCR) and CO42(RF-CVBS). No Check the CN888(Tuner)
5-1 IC011 #1 RF-CVBS
and the CN702_1.
5-2 IC011 #5 S-Video
5-3 IC011 #8 VCR
Yes
No Check the #19 and
6 Does the signal appear at IC010.
related circuit of IC011.
Yes
No Check the IC010 (#31~34,
Does the signal appear at
7 37~44, 47~50) Data out
IC200 and 3.3V_BA.
and related circuit of IC010.
Yes
Does the signal appear at No Check the IC200 and
IC300 and 3.3V_BD. related circuit of IC200.
Yes
Check the IC901 and CN901.
NK15A*/NK17A* 5-3
5 Troubleshooting
CONFIDENTIAL
WAVEFORMS
5-1 IC011 #1 RF-CVBS 5-2 IC011 #5 S-Video 5-3 IC011 #8 VCR
6 IC011 #19 7 IC010 Data Out
5-4 NK15A*/NK17A*
5 Troubleshooting
CONFIDENTIAL
5-4 No Sound
Does the signal appear at
Pin 67 (Tuner sound signal) and Pin
47, 48 (PC sound) and Pin 56, 57 No Check the CN403 (PC conector) and the
(SCART1 sound) and Pin 53, 54 CN402 (CN001) and the CN200 (CN002)
(SCART2) Pin 50, 51 (VCR) of and the CN888 (Tuner) and the CN702_1.
IC 919 (MSP3451)?
Yes
Does the signal appear at Pin 27, No Check the IC919 and
28 of IC919 (MSP3451)? related circuit of IC919.
Yes
Does the signal appear No Check the IC501 (Audio amp) and
at L501 ~L504? related circuit of IC501.
Yes
Replace the speaker.
NK15A*/NK17A* 5-5
5 Troubleshooting
CONFIDENTIAL
Memo
5-6 NK15A*/NK17A*
CONFIDENTIAL
6 Exploded View and Parts List
6-1 NK15A*
NK15A*/NK17A* 6-1
6 Exploded View & Parts List
CONFIDENTIAL
6-2 NK17A*
6-2 NK15A*/NK17A*
CONFIDENTIAL
8 Block Diagram
8-1 NK15A*/NK17A*
NK15A*/NK17A* 8-1
8 Block Diagrams
CONFIDENTIAL
8-2 NK15A*/NK17A*
8-2 NK15A*/NK17A*
9-1
CONFIDENTIAL
CN888
SPK OUT R +
SPK OUT L +
SPK OUT R -
SPK OUT L -
AUDIO R IN
VCR CVB S
AUDIO L IN
HP_IDENT
TUNER
KEY1
KEY1
HP-R
HP-L
GND
GND
GND
GND
C IN
Y IN
NC
NC
RED
GREEN
CN706_1
CN502
CN501
BLUE
CN702_1
GND
GND
GND
CN401
GND
GND
NC
PC_IDENT
GND
DDC_DATA
H_SYNC
V_SYNC
DDC_CLK
GND
PC_LIN
CN403
PC_RIN
PC_LIN
PC_RIN
AUDIO OUT(R;500mV/1K)
AUDIO IN(R;500mV/10K)
GAMMA AUDIO OUT(L;500mV/1K)
GND AUDIO COMMON GND 4
TX3+ BLUE GND 5
TX3- AUDIO IN(L;500mV/10K) 6
GND FUNCTION S/W(0~2V/9.5V~12V) 8
TXCLK+ GREEN GND 9
TXCLK- RED GND 13
CN901(15", 17")
GND F/B GND 14
TX2+ VIDEO OUTPUT GND 17
TX2- VIDEO INPUT GND 18
CN002
GND CVBS OUT(1V/75) 19
TX1+ CVBS IN(1V/75) 20
TX1- COMMON GND 21
GND
TX0+ AUDIO OUT(R;500mV/1K)
TX0- AUDIO IN(R;500mV/10K)
LVDS GND AUDIO OUT(L;500mV/1K)
AUDIO COMMON GND 4
+3.3V
BLUE GND 5
+3.3V
AUDIO IN(L;500mV/10K) 6
BLUE IN(700mV/75) 7
FUNCTION S/W(0~2V/9.5V~12V) 8
GREEN GND 9
NO CONNECTION 10
GREEN IN(700mV/75) 11
NO CONNECTION 12
RED GND 13
F/B GND 14
RED IN(700mV75) 15
RGB F/B(0~0. 4V/1~3V) 16
VIDEO OUTPUT GND 17
VIDEO INPUT GND 18
CN001
CVBS OUT(1V/75) 19
CVBS IN(1V/75) 20
To Inverter
CN701_1
COMMON GND 21
CN920
9 Wiring Diagram
CN801
+14V
+14V
GND
BRIGHT CONTROL
INVERTER ON/0FF
NK15A*/NK17A*
NC
CN810
LED_GRN
LED_RED
+14V
+3.3V
GND
GND
GND
GND
+5V
14V
14V
14V
NC
NC
NC
NC
IR