LG KT-17LZ21 User manual
Digital LCD Combi TV
SERVICE MANUAL
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
CHASSIS : ML-027B
MODEL : KT-17LZ21
website:http://biz.LGservice.com
e-mail:http://www.LGEservice.com/techsup.html
CONTENTS
CONTENTS .............................................................................................. 2
PRODUCT SAFETY ..................................................................................3
SPECIFICATION........................................................................................4
DESCRIPTION OF CONTROLS .............................................................. 7
ADJUSTMENT INSTRUCTION................................................................11
TROUBLE SHOOTING............................................................................14
BLOCK DIAGRAM...................................................................................15
PRINTED CIRCUIT BOARD....................................................................16
EXPLODED VIEW .................................................................................. 19
EXPLODED VIEW PARTS LIST..............................................................20
REPLACEMENT PARTS LIST ............................................................... 21
SVC. SHEET ...............................................................................................
PRODUCT SAFETY
IMPORTANT SAFETY NOTICE
This manual was prepared for use only by properly trained audiovisual service
technicians. When servicing this product, under no circumstances should the
original design be modified or altered without permission from LG Electronics
Inc. All components should be replaced only with types identical to those in the
original circuit and their physical location, wiring, and lead dress must conform
to original layout upon completion of repairs. If any fuse (or Fusible Resistor) in
this TV receiver is blown, replace it only with the factory specified fuse type and
rating. When replacing a high wattage resistor (Oxide Metal Film Resistor, over
1W), keep the resistor 10mm away from PCB. Always keep wires away from
high voltage or high temperature parts.
Special components are also used to prevent shock and fire hazard.
These components are indicated by the letter “x” included in their component
designators and are required to maintain safe performance. No deviations are
allowed without prior approval by LG Electronis Inc. Service work should be
performed only after you are thoroughly familiar with these safety checks and
servicing guidelines.
Circuit diagrams may occasionally differ from the actual circuit used.
This way, implementation of the latest safety and performance improvement
changes into the set is not delayed until the new service literature is printed.
CAUTION: Do not attempt to modify this product in any way.
Never perform customized installations without manufacturer’s
approval.
Unauthorized modifications will not only void the warranty, but may
lead to property damage or user injury.
GENERAL GUIDANCE
An lsolation Transformer should always be used during the servicing
of a receiver whose chassis is not isolated from the AC power line. Use a
transformer of adequate power rating to protect against personal injury from
electrical shocks. It will also protect the receiver and its components from being
damaged by accidental shorts of the circuitry that may be inadvertently
introduced during the service operation.
Before returning the receiver to the customer, always perform an AC leakage
current check on the exposed metallic parts of the cabinet, such as antennas,
terminals, etc., to be sure the set is safe to operate
without damage of electrical shock.
LEAKAGE CURRENT COLD CHECK
(ANTENNA COLD CHECK)
With the instrument’s AC plug removed from AC source, connect an electrical
jumper across the two AC plug prongs. Place the AC switch in the on position,
connect one lead of ohm-meter to the AC plug prongs tied together, and touch
other ohm-meter lead in turn to each exposed metallic parts such as antenna
terminals, phone jacks, etc. If the exposed metallic part has a return path to the
chassis, the measured resistance should be between 1MΩand 5.2MΩ. When
the exposed metal has no return path to the chassis the reading must be
infinite. Any other abnormality that exists must be corrected before
the receiver is returned to the customer.
ELECTROSTATICALLY SENSITIVE DEVICES
Some semiconductor (solid-state) devices can be damaged easily by static
electricity. Such components commonly are called Electrostatically Sensitive
(ES) Devices. Examples of typical ES devices are integrated circuits and some
field-effect transistors and semiconductor “chip” components. The following
techniques should be used to help reduce the incidence of component damage
caused by static electricity.
1. Immediately before handling any semiconductor component or
semiconductor-equipped assembly, drain off any electrostatic charge on the
body by touching a known earth ground. Alternatively, obtain and wear a
commercially available discharging wrist strap device, which should be
removed for potential shock reasons prior to applying power to the unit under
test.
2. After removing an electrical assembly equipped with ES devices, place the
assembly on a conductive surface such as an ESD mat, to prevent
electrostatic charge buildup or exposure of the assembly.
3. Use only a grounded-tip soldering iron to solder or unsolder ES devices.
4. Use only an anti-static solder removal device. Some solder removal devices
not classified as “anti-static” can generate electrical charges sufficient to
damage ES devices.
5. Do not use freon-propelled chemicals. These can generate electrical charge
sufficient to damage ES devices.
6. Do not remove a replacement ES device from its protective package until
immediately before you are ready to install it. (Most replacement ES devices
are packaged with leads electrically shorted together by conductive foam,
aluminum foil, or comparable conductive material.)
7. Immediately before removing the protective material from the leads of a
replacement ES device, 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 bodily motions when handling unpackaged replacement ES
devices. (Otherwise, seemingly harmless motion, such as the brushing
together of your clothing or the lifting of your foot from a carpeted floor, can
generate static electricity sufficient to damage an ES device.)
1. Application range
This specification is applied to ML-027C chassis.
2. Requirement for Test
Testing for standard of each part must be followed in below
condition.
(1) Temperature: 25°C ± 5°C
(2) Humidity: 65% ± 10%
(3) Power: Standard input voltage (AC 100-240V, 50/60Hz)
(4) Measurement must be performed after heat-run more than
15min.
(5) Adjusting standard for this chassis is followed a special
standard.
3. Test and Inspection method
(1) Capacity: Follow LG electronics TV Testing Standard.
(2) Another Required Standard
EMI: Following CE Standard(EN55020,EN55013)
SAFETY: Following CB Standard(EN60065)
SPECIFICATION
NOTE : Specifications and others are subject to change without notice for improvement
.
4.General Specification(TV)
1
2
3
4
5
6
7
8
9
Video input applicable system
Receivable broadcasting system
RF input channel
Input voltage
Picture size
Tuning system
Operting environment
Storage environment
Display
1)PAL-D/K,B/G,I
2)NTSC-M
3)PAL-I
4)SECAM NTSC 4.43’
1)PAL/SECAM BG
2)PAL/SECAM DK
3)PAL I/I
4)SECAM L/L’
5)NTSC M
6)PAL-N/M
7)NTSC M
VHF : E2 ~ E12
UHF : E21 ~ E69
CATV : S1 ~ S20
HYPER : S21 ~ S41
L/L’ : B,C,D
VHF : 2 ~ 13
UHF : 14 ~ 69
CATV : 1 ~ 125
HYPER : S21 ~ S41
V/UHF : 1 ~62
CATV : C13 ~ C38
AC 100 - 240V/ 50Hz,60HZ
AC 100 - 240V/50Hz
AC 100V,50/60Hz
584.40 mm
FVS 100 program
FS
1)Temp : 0 ~ 40 deg
2)Humidity : 85%
3)Temp : -20 ~ 60 deg
4)Humidity : 85%
LCD Module
Item Specification Remark
No.
EU/Non-EU
(PAL Market)
NTSC Market
PAL
FRANCE
NTSC
JAPAN
Non-EU,Latin America, EU
Japan, USA
23.01”
PAL, 200PR.(Option)
NTSC
LG-PHILPS
5.General Specification(Monitor)
1
2
3
4
5
6
7
8
Panel
Frequency range
D-SUB Pin configuration
Control function
D4 Jack
(525i,525p,750p,1125i)
Response time(TYP/MAX)
Power ON
Stand by
DPMS Mode
Power off
LCD Module
23.01” (17.1”) wide TFT WXGA LCD
H:31 ~ 61KHz, V: 56 ~ 85Hz
1: RED 2: Green
3: BLUE 4: ID2(GND)
5: S.T(GND) 6: RED GND
7: Green GND 8: Blue GND
9: N.C 10: D-GND
11: ID0(GND) 12: SDA
13: H-Sync 14:V-Sync
15:SCL Shell: GND
1) Contrast/ Brightness
2) H- Position/ V-Position
3) Tracking : Clock/Phase
4) Auto Configure
1: Y
3: Pb
5: Pr
7: Line1 Ready
9: LINE2
11: LINE3
13: Line3 Ready
2: Y GND
4: Pb GND
6: Pr GND
8: LINE1
10: Line2 Ready
12: SWITCH GND
14: SWITCH
1) Rising Time: 12(17”),13(23”)
2) Fall Time: 13(17”),12(23”)
Item Specification RemarkUnit
No.
10: Digital GND
Japan only
LED
Green
Red
Amber
**.
23 inch
17 inch
23 inch
17 inch
23 inch
17 inch
H/V-Sync
ON/ON
OFF/ON
ON/OFF
-
Video
Active
OFF
OFF
-
Power consumption
≤67(17”),90(23”)
≤3.0
≤
-
W
W
W
W
ms
ms
Type
Size
Pixel Pitch
Pixel Format
Active Video Area
Coating
Back Light
Color Active Matrix TFT
23.01” wide(584.40mm)
17.1” wide(434.38mm)
0.1305mm X 0.3915mm
0.291mm X 0.291mm
1280 X 768 Pixels
RGB Stripe Matrix
501.12mm X 300.67mm
400mm X 258
Anti Glare
Hard coating(3H)
6CCFL (Cold Cathode
Fluorescent Lamp)
6.Feature and Function
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
Teletext
REMOCON
AV input
S-AV input
Component input
PERI TV connector
RGB input
D-sub audio input
2 Carrier stereo
NICAM stereo
2 Carrier dual
NICAM dual
DW(Double Window) mode
MW(Multi Window) mode
Film mode
Noise reduction
Progressive scan
Motion detection
Dolby virtual
Swivel Speaker
EZ-pip
TOP, FLOF, LIST 10 page
NEC code
2
1
1
Full SCART: 1
1
1
BG,DK
BG,I,LL’
BG,DK
BG,I,LL’
O
O
O
X
O
O
O
X
O
Item Specification Remark
No.
Top(option)
PAL/NTSC
Side and Rear
Side
Rear(option)
Rear(Option,EU)
D-Sub 15 pin
Stereo
7.General Specification (DVD)
1
2
3
4
5
6
7
8
9
10
Video/Audio read,decoding and converting
applicable system
Mechanism
Maximum storage capacities
Protections
Input voltage
Video out
Audio out
Dimension
Operating Environment
Storage Environment
DVD Video(Single/Double layer),DVD-R/RW,
DVD+R/RW, Video CD,CVD, SVCD, CD-R/RW, CD-
Audio,MP3 Audio CD Digital Audio (CD TEXT)
1)Slim Dimensional DVD loader
2)Disc loading mororized
3) Electronics anti-vibration servo system
4) Optical pick-up driver
5) Roller loading and eject system
6) Detect disc present using mechanical switch
7)DTS,Dolby surround
4.7 Gbytes and 17.08 Gbytes for dual layer/dual side
second disc insertion protect
8V/ 5V/ 3.3V DC
CVBS video out
Component vide out (Y,Pb,Pr)
SPDIF digital audio out
(W x H x D: 143.0 x 23 x 128.4mm)
1) Temp: -20 ~ 70 deg
2) Humidity: Under 80%
1) Temp: -40 ~ 85 deg
2) Humidity: Under 90%
Item Specification Remark
No.
DESCRIPTION OF CONTROLS
123
456
7
PSM SSM
MULTIMEDIA
8
0
LIST/ZOOM
ARC
9
POWER
OPEN/CLOSE
TV/AV
MUTE I/II/AUDIO
PIP TEXT/SUB-T
PR - PR +
INPUT
EXIT
SWAP
MENU PR
VOL OK VOL
PR
PLAY/PAUSE /II
A-B
DISK MENU
3D SOUND
PROGRAM
TITLE MENU
ANGLE
?
REPEAT
STOP
STILL
SCAN
SIZE
POSITION
SLEEP
M
SKIP
SCAN
SKIP
SCAN
All the functions can be controlled with the remote control handset.
Some functions can also be adjusted with the buttons on the front
panel of the set. Only the remote control handset supplied will
operate this set.
Remote control handset
Before you use the remote control handset, please install the bat-
teries. See the next page.
1. POWER
switches the set on from standby or off to standby.
2. OPEN/CLOSE
Open or close the disc tray.
3. MUTE
switches the sound on or off.
4. PIP BUTTONS (option)
PIP
switches the sub picture on or off.
PR +/-
selects a programme for the sub picture.
SWAP
alternates between main and sub picture.
INPUT
selects the input mode for the sub picture.
SIZE
adjusts the sub picture size.
STILL
freezes motion of the sub picture.
POSITION
relocates the sub picture in up/down or left/right direction.
SCAN
switches on the programme scan mode through 3/12 sub pic-
tures and 9 main pictures.
5. SWAP
returns to the previously viewed programme.
selects a favourite programme.
6. MENU
selects a menu.
7. / (Programme Up/Down)
selects a programme or a menu item.
switches the set on from standby.
/ (Volume Up/Down)
adjusts the volume.
adjusts menu settings.
OK
accepts your selection or displays the current mode.
8. NUMBER BUTTONS
switches the set on from standby and selects a programme.
9. PSM (Picture Status Memory)
recalls your preferred picture setting.
10. SLEEP
sets the sleep timer.
11. STILL (option)
freezes motion of the picture.
1
2
3
4
5
6
9
10
11
7
8
12. TV/AV
selects the remote operating mode.
clears the menu from the screen.
switches the set on from standby.
13. I/II/AUDIO (option)
selects the language during dual language broadcast.
selects the sound output (option).
changes the AUDIO status during DVD playback.
14. TELETEXT BUTTONS/SUB-T (option)
These buttons are used for teletext.
For further details, see the ‘Teletext’section.
changes the subtitle language during DVD playback.
15. EXIT
exits from each mode.
16. SSM (Sound Status Memory)
recalls your preferred sound setting.
17. MULTIMEDIA
selects DVD or PC monitor mode.
clears the menu from the screen.
switches the set on from standby.
18. LIST/ZOOM (option)
displays the programme table.
changes the picture size during DVD playback.
19. DVD BUTTONS
controls a LG DVD player.
For further details, see the ‘DVD Operation’section.
20. ARC
select your desired picture format.
Note : In teletext mode, the PR +/-,SWAP and INPUT buttons are
used for teletext function.
Battery installation
The remote control handset is powered by two AAA type batteries.
To load the batteries, turn the remote control handset over and
open the battery compartment. Install two batteries as indicated by
the polarity symbols ( and ) marked inside the compartment.
Note : To avoid damage from possible battery leakage, remove the
batteries if you do not plan to use the remote control handset for an
extended period of time.
123
456
7
PSM SSM
MULTIMEDIA
8
0
LIST/ZOOM
ARC
9
POWER
OPEN/CLOSE
TV/AV
MUTE I/II/AUDIO
PIP TEXT/SUB-T
PR - PR +
INPUT
EXIT
SWAP
MENU PR
VOL OK VOL
PR
PLAY/PAUSE /II
A-B
DISK MENU
3D SOUND
PROGRAM
TITLE MENU
ANGLE
?
REPEAT
STOP
STILL
SCAN
SIZE
POSITION
SLEEP
M
SKIP
SCAN
SKIP
SCAN
12
13
14
15
16
17
20
19
18
+
-
1. ON/OFF
switches the set on from standby or off to
standby.
Note : Power line lives even when the power
is off.
2. TV/AV//DVD/PC
selects the remote operating mode.
clears the menu from the screen.
switches the set on from standby.
3. MENU
selects a menu.
4. OK
accepts your selection or displays the current
mode.
5. / (Volume Up/Down)
adjusts the volume.
adjusts menu settings.
6. / (Programme Up/Down)
selects a programme or a menu item.
switches the set on from standby.
7. REMOTE CONTROL SENSOR
8. LED (Light Emitting Diode) DISPLAY
illuminates brightly when the set is switched on.
: POWER/STANDBY indicator
: MONO indicator
:STEREO indicator
: DUAL indicator
: DPM indicator
9. STOP
Stops playback.
10. PLAY/PAUSE
Start or pause playback.
11. SKIP/SCAN
Starts playback from the selected chapter or
track.
12. REPEAT
Repeat playback.
13. OPEN/CLOSE
Open or close the disc tray.
Note : When DISC TRAY doesn’t work, press
the OPEN/CLOSE button on the side panel
for a moment.
14. DISC TRAY
Place a disc on the disc tray.
Note : Insert a disc after facing
a logo-printed side to front. See
a figure.
Top panel
side panel
SKIP/SCAN
SKIP/SCAN
STOP
PLAY/PAUSE
REPEAT
OPEN/CLOSE
78
MONO
STEREO
ST
DUAL
DPM
ON/OFF TV/AV/
DVD/PC MENU OK VOL PR
1 2 3 4 5 6
14
9
10
11
12
13
R
S-VIDEO VIDEO
L / MONO AUDIO
AV
1. DC 15V INPUT SOCKET
2. DVD/DTV INPUT SOCKETS
3. DVD VIDEO OUT SOCKET
4. DVD DIGITAL SOUND OUT SOCKET
Connect to digital audio from various types of equipment.
5. PC/SOUND INPUT SOCKETS
Connect the monitor output socket of the PERSONAL COM-
PUTER to this socket.
6. AERIAL SOCKET
7. HEADPHONE SOCKET
Connect the headphone plug to this socket.
8. AUDIO/VIDEO IN SOCKETS (AV)
Connect the audio/video out sockets of external equipment to
these sockets.
S-VIDEO/AUDIO IN SOCKETS (S-VIDEO)
Connect the video out socket of an S-VIDEO VCR to the S-
VIDEO socket.
Connects the audio out sockets of the S-VIDEO VCR to the
audio sockets as in AV.
Back panel
Side panel
ANT IN
+75 Ω
PC
SOUND
DVD OUT
OPTICAL
DIGITAL
SOUND
OUT
VIDEO
DC IN (15V) PC INPUT
COMPONENT
AUDIO
DVD/DTV IN
YP
B
P
R
L R
1 2 3 4 5 6
7
8
1. Application Object
This instruction is for the application to the LCD TV.
2. Notes
(1) This set uses an adapter, so connect the adapter and the
set correctly before adjustment.
(2) The adjustment must be performed under the correct
sequence.
(3) The adjustment must be performed in the circumstance of
25°C±5°C of temperature and 65±10% of relative humidity
if there is no specific designation.
(4) The input voltage of the receiver must keep 100~220V,
50/60Hz in adjusting.
(5) The set must be operated for 15 minutes preliminarily
before adjustment if there is no specific designation.
[ ‘Heat Run’must be performed with the full white signal or TV
noise signal in the internal part of the set.
[ The time for ‘Heat Run’can be changed owing to production
plan.
3. PC Input Mode Adjustment
3-1. Required Test Equipment
(1) MSPG-925LTH or A pattern generator ;Gray pattern of 16
tones
(2) A adjustment communicator.
3-2. Preparation for Adjustment
(1) Perform ‘Heat Run’for more than 15 minutes in white
pattern.
(2) Connect the signal of pattern generator with LCD TV.
3-3. Auto Gray Adjustment
(1) Apply the gray signal of XGA(1024X768) 16 tones by
using MSPG-925LTH.
(2) In Service menu mode,adjust the Auto gay from 0 to 1 by
using Vol(+) button.
ADJUSTMENT INSTRUCTION
4. Position of Mode Adjustment
Timming chart of Receivable Mode * H[dot]/V[line]
Mode
H_Display
V_Display
V_Frequency
H_Total
H_Blanking
H_Sync
H_Polarity
H_Vp
H_Fp
H-Freq[KHz]
/Clk[MHz]
V_Total
V_Blanking
V_Sync
V_Polarity
V_Bp
V_Fp
VGA-60
640
480
60
800
160
96
NEG.
48
16
31.469
25.175
525
45
2
NEG
33
10
VGA-67
640
480
67
864
224
64
NEG.
96
64
35.0
30.24
525
45
3
NEG
39
3
VGA-75
640
480
75
840
200
64
NEG
120
16
37.5
31.5
500
20
3
NEG
16
1
VGA-85
640
480
82
832
192
56
NEG
80
56
43.269
36.0
509
29
3
NEG
25
1
SVGA-56
800
600
56
1024
224
72
POS
128
24
35.156
36.0
62.5
25
2
POS
22
1
SVGA-60
800
600
60
1056
256
128
POS
88
40
37.879
40.0
628
28
4
POS
23
1
SVGA-72
800
600
72
1040
240
120
POS
64
56
48.077
50.0
666
66
6
POS
23
37
Mode
H_Display
V_Display
V_Frequency
H_Total
H_Blanking
H_Sync
H_Polarity
H_Vp
H_Fp
H-Freq[KHz]
/Clk[MHz]
V_Total
V_Blanking
V_Sync
V_Polarity
V_Bp
V_Fp
SVGA-75
800
600
75
1056
256
80
POS
160
16
46.875
49.5
625
25
3
POS
21
1
SVGA-
85800
600
85
1048
248
64
POS
152
32
53.674
56.25
631
31
3
POS
27
1
XGA-60
1024
768
60
1344
320
136
NEG
136
160
48.363
65.0
806
38
6
NEG
29
3
XGA-70
1024
768
70
1328
304
136
NEG
144
24
56.476
75.0
806
38
6
NEG
29
3
XGA-75
1024
768
75
1312
288
96
POS
176
16
60.023
78.75
800
32
3
POS
28
1
XGA-85
1024
768
82
1376
352
96
POS
208
48
68.677
84.997
808
40
3
POS
36
1
WXGA-50
1280
768
50
1648
368
128
NEG
184
56
39.518
65.125
791
23
7
POS
15
1
WXGA-60
1280
768
60
1680
400
136
NEG
200
64
47.693
80.125
795
27
7
POS
19
1
5. EDID(The Extended Display Identification Data)
EDID Table
6. Option1 data
7. Option2 data
00
10
20
30
40
50
60
70
00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F
00
00
14
81
01
01
26
00
FF
0B
50
40
01
01
30
32
FF
01
54
81
01
01
18
55
FF
01
BF
80
01
01
88
1E
FF
78
E8
01
01
01
36
46
FF
1F
80
01
01
01
00
0D
FF
17
31
10
01
01
0E
00
00
70
59
0E
01
01
C3
0A
30
E8
3B
01
F9
01
10
20
E5
C3
D9
01
15
01
00
20
D7
A0
45
01
01
64
00
20
3A
A3
59
01
01
19
1E
20
01
54
61
01
01
00
00
20
00
4C
59
01
01
40
00
20
00
97
71
01
01
41
00
00
00
24
59
01
01
00
FD
C8
Scart
A2 Ster
System
Top
I/II Save
TEXT
200PR
Option Code
0
1
0
1
0
1
0
1
0
1
0
1
0
1
2
3
Function Remark
100 Program
200 Program
TEXT Off
TEXT On
CH.Sound Non Memory
CH.Sound Memory
TOP OFF
TOP ON
SCART OFF
SCART ON
FM Stereo/Dual
FM Mono
GB/I/DK/M
GB/I/DK/L
Reserved
Reserved
OSD
Lang.
HDEV
VOL
ACMS
PIP Text
Option Code
0
1
0
1
0
1
0
1
0
1
2
3
4
Function Remark
PIP Text
PIP Text not display
ACMS On
ACMS Of
f
OFF
Middle Asia Vol On
HDEV Off
HDEV
ON
Eng.only
Eng/Deut/Fran/Ital/Esp
2
6(
EU5+Netherlands)
4
OSD
Lang.
Option Code
5
6
7
Function Remark
11
7
Reserved
8. Option3 data
TXT-Lan
CH+Aus
Mono
MD
SAve
IIC AFT
Option Code
0
1
0
1
0
1
0
1
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Function Remark
IIC AFT Off
IIC AFT On
MD Save On
MD Save Off
Mono Off
Mono On
OFF
China,Australia On
West EU
East EU1
Turky EU
East EU2
Cyrillic 1
Cyrillic 2
Cyrillic 3
TURK GRE 1
TURK GRE 2
TURK GRE 3
ARAB FRAN
ARAB ENG
ARAB HEB 1
ARAB HEB 2
FARSI ENG
FARSI FRA
FARSI ALL
1 No sound Defective Reset IC of IC604. 1) Check volume and speaker.
- Speaker Defective MSP3411 of IC601. - Sound comes out only when being inputted into Audio
- Earphone Defective B+(8V,5V) of IC603. L/R.
2) Check after replacing IC604.
3) Replace IC601.
4) Check and replace B+ of IC603.
2 Video color beat noise Earphone shield case being touched.
Check the mould of shield and SJ209, Replace shield case.
Soldering IC301 and IC510. Re-soldering
1 No screen Input error of inverter connector 1) Bend the pin legs of P1 connector -> recheck them
2) Check and repair F804.
P704 connector 1) Check and fix P704 connector
being slipped out 2) Check and fix the components at P704 LCD module
and at main board.
3) Check Pin21.
Cracked components and Check and repair tuner board and main board
soldering at tuner board
2 Dark screen 1) Defective LCD lamp 1) Replace the inverter
2) Defective inverter 2) Replace the LCD lamp
3) Input error of inverter connector 2) Check the connector input.
TROUBLESHOOTING
1. General Features
2. PC Mode
No. Symptom Cause Check Point
No. Symptom Cause Check Point
Check Point
1 Screen noise Clock or phase being 1) Resettig is needed according to the video card of each
not able to be adjusted. PC.
2) Horizontal noise : adjust phase until no horizontal
noise occurres.
3) Vertical noise : adjust clock in menu until no vertical
noise occurres.
2 Screen position error Screen position error 1) Play the Auto Configure in Menu.
horizontally or vertically 2) Adjust horizontal and vertical position until the screen
displayes normally.
3 Color beat noise Soldering D-SUB Jack of JA202 Recheck adn repair JA202,IC202
and IC202.
3. TV and external input
No. Symptom Cause
4 . DVD Mode
1 When the KEY of DVD is not working: 1)Check the P801.
2 When the LOGO screen can’t display: 2)Check the 28PFFC cable.
3 When you can’t insert the DVD title: 3)Check the 8P power cable.
When you can’t see the screen:
4 If you can’t operate it after check the above status,
replace the DVD DECK.
No. Symptom Check Point
BLOCK DIAGRAM
PRINTED CIRCUIT BOARD
MAIN(TOP)
MAIN(BOTTOM)
SIDE AV
DVD CONTROL
LED
TV CONTROL
EXPLODED VIEW
524
500
530
581
570
320
390
582
400
401
550
300
112
311
310
560
120
120
521
540
541
580
522
523
340
350
330
360
370
380
330
112 6306V17001A LCD MODULE,LC171W03-A4 LG PHILPS TFT COLOR TFT LCD MODULE
120 6400GKTX01A SPEAKER,FULLRANGE,8OHM 7/12W 83DB OTHERS 34.5X71
300 3091V00535B CABINET ASSEMBLY,KZ-17LZ21 NON ML027C .
310 5020V00798A BUTTON,CONTROL 17LZ20 ABS 8KEY NON
311 4810V00836H BRACKET,CONTROL KZ-17LZ21 ML027B ABS, HF-380 .
320 5020V00799A BUTTON,CONTROL 17LZ21 ABS NON NON
330 4950V00157A METAL,STAND NON HINGE ASSY_15LA60
340 4810V00777A BRACKET,STAND 15LA60 ML012B NON HINGE FRONT
350 4810V00778A BRACKET,STAND 15LA60 ML012B NON HINGE COVER
360 4810V00776A BRACKET,DECO 15LA60 ML012B NON STAND DECO.
370 4810V00779A BRACKET,STAND 15LA60 ML012B NON BASE
380 4950V00135A METAL,STAND NON BASE, 15LA60
390 4810V00837A BRACKET,CONTROL 17LZ21 NON NON NON
400 3809V00371U BACK COVER ASSEMBLY,KT-17LZ21 DVD/COMPONENT 411-960A NON
401 3550V00335A COVER,REAR AV 17LZ20 ABS, HF-380 NON
500 6871VMMQ91D PWB(PCB) ASSEMBLY,MAIN ML-027B KT-17LZ21 MANUAL ASSY
521 4950V00168B METAL,SHIELD NON FOR DVD
522 4950V00191A METAL,SHIELD ET-KZ-17LZ21
523 4810V00896A BRACKET,REAR AV 17LZ20 NON NON .
524 4950V00167G METAL,FRAME EGI .
530 6633VA0003V INVERTER ASSEMBLY,15V NON ECT 6LAMP 03T VE FRONTEC
540 6871VSMW84A PWB(PCB) ASSEMBLY,SUB A/V ML027B KZ-17LZ21 SIDE A/V MANUAL
541 4810V00838J BRACKET,SIDE AV KT-17LZ21 "AV" ML027B ABS, HF380 NON
550 6871VSMW87A PWB(PCB) ASSEMBLY,SUB LED ML027B KZ-17LZ21 INDEX MANUAL
560 6871VSMW86A PWB(PCB) ASSEMBLY,SUB CTL ML027B KZ-17LZ21 TV CONTROL
570 6871VSMW85A PWB(PCB) ASSEMBLY,SUB CTL ML027B KZ-17LZ21 DVD CONTROL
580 4405V00002B DVD-ROM,DSV-810 DVS -MMA-BBE22
581 4950V00200B METAL,SHIELD DVD TOP PRESS
582 4950V00201B METAL,SHIELD EGI DVD BOTTOM PRESS
EXPLODED VIEW PARTS LIST
No. PART NO. DESCRIPTION
Table of contents
Other LG LCD TV manuals
