LG Z20LCD1 User manual

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Website:http://biz.LGservice.com
e-mail: http://www.LGEservice.com/techsup.html
LCD TV SERVICE
MANUAL
FACTORY MODEL: 20LV1R.AUSBZA
MODEL: Z20LCD1
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.

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CONTENTS
CONTENTS ......................................................................................................................................2
PRODUCT SAFETY .......................................................................................................................3
SPECIFICATION ...............................................................................................................................6
SVC REMOCON……………... .....................................................................................................8
TROUBLE SHOOTING ..................................................................................................................9
BLOCK DIAGRAM.........................................................................................................................13
WIRING DIAGRAM .........................................................................................................................15
EXPLODED VIEW ...............……………………………................................................................... 16
REPLACEMENT PARTS LIST ............................…...............……………………………................ 18
SVC. SHEET .................................................................................................................................

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SAFETY PRECAUTIONS

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SERVICING PRECAUTIONS

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.

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SPECIFICATION
NOTE: Specifications and others are subject to change without notice for improvement.
1. Application range
1.1 This spec sheet is applied all of the 20" LCD TV
1.2 Not included spec and each product spec in this spec sheet apply correspondingly to the following each country
standard and requirement of Buyer
2. Specification
Each part is tested as below without special appointment.
2.1 Temperature: 20±5°C
2.2 Relative Humidity: 65±20%
2.3 Power Voltage: input voltage (110V±10%, 50/60±3 Hz)
* Standard Voltage of each product is marked by models
2.4 Specification and performance of each parts are followed each drawing and specification by part number in
accordance with BOM.
2.5 The receiver must be operated for about 30 minutes prior to the adjustment.
3.General Specification (TV)
No Item Specification
1. Input Signal RF (NTSC-M), Video, S-Video, Component Video, Graphic (VGA)
2.
Component Support 480i, 576i, 480P, 576P, 720P, 1080i
3. Input Voltage 110V±10%, 50/60±3 Hz
4. Market USA
5. Screen Size 20 inch Wide
6. Vertical refresh rate 56 Hz to 75 Hz
7. Horizontal frequency 31.5 kHz
8.
Resolutions
640 x 480
9. Operating Environment Temp: 0 ~ 40 deg, Humidity: 10% ~ 80 %
10.
Storage Environment
Temp: -10 ~ 50 deg, Humidity: 5% ~ 85 %

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4. External Input Format
4-1. AV/S-Video/Component Video Inputs
AV (Composite Video)
Video system NTSC
Amplitude 1.0Vpp (including sync)
Impedance 75 ohm terminated
S-Video
Video system NTSC
Y signal amplitude 1.0Vpp (including sync)
C signal amplitude 0.286Vpp
Impedance 75 ohm terminated
Component Video
HDTV 480i, 480p, 720p, 1080i
Y signal amplitude 1.0Vpp (including sync)
Pr,(R-Y) / Pb ,(B-Y) signal amplitude 0.7Vpp
Impedance 75 ohm terminated
4-2. TV RF Inputs
TUNER SIGNAL
Receiving System NSTC-M
Channel Coverage NSTC-M
Tuner ChangHong AF5-U2F11RW
AIR CATV
VHF Low band 55.25~127.25 55.25~127.25
VHF High band 133.25~361.25 133.25~361.25
UHF band 367.25~801.25 367.25~801.25
Picture carrier Sound carrier
IF Frequency 45.75 MHz 41.25MHz
Impedance 75 ohm terminated
LEVEL 70dBuV

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SVC REMOCON
Key Function
POWER Press to turn on/off the TV. The TV is never completely powered
off unless it is physically unplugged.
DISPLAY Display current status
MUTE Temporarily interrupt the sound or restore
CH
Press ▲ or▼ to brows through the TV channels which are not
erased. To view a blocked channel, use the digit buttons to access
the channel and enter your access code.
VOL Press + or – to adjust the volume.
0~9/100 To select a TV channel directly
PRE-CH To return the last channel you were watching.
PC To change PC mode (only for Z15LCD1)
V-CHIP Press this button to setup parental control.
TV/VIDE
O
Select your input source: press repeatedly to select TV, AV1, AV2,
S-Video or Component Video mode, according to where you
connected your external source.
SLEEP
With this key you can set a time period after which the TV should
switch itself to standby. Press the key repeatedly to select the
number of minutes. The counter runs from 0,30,60,90,120
minutes. The timer begins to count down from the number of
minutes selected after the display has disappeared.
MTS/SAP Press this key to activate Multi-channel Television Sound, Stereo
or Mono sound.
Up/Down/
Left/Right
Up/Down to select the function in the Menu.
Left/Right to enter the function or adjust the value
MENU Press repeatedly to display OSD menu or exit the menu or
sub-menu.
CAPTION Press this button to bring up closed caption setup menu.