AOC TCL LCD27VN User manual

27’’ LCD TV Color Monitor TCL LCD27VN
1
Service
Service
Service
Horizontal Frequency
31.5KHz-80KHz
TABLE OF CONTENTS
Description Page Description Page
SAFETY NOTICE
ANY PERSON ATTEMPTING TO SERVICE THIS CHASSIS MUST FAMILIARIZE HIMSELF WITH THE
CHASSIS AND BE AWARE OF THE NECESSARY SAFETY PRECAUTIONS TO BE USED WHEN SERVICING
ELECTRONIC EQUIPMENT CONTAINING HIGH VOLTAGES.
7.1 Main Board.………..........................................25
7.2 Power Board………..…..…..............................29
7.3 Key/IR Board….………...............….......................31
7.4 Earphone Board....……………..............................32
8. Block Diagram.……….….........................................33
8.1 Main Board.…….……………………………..….33
8.2 Power Board……….…....………………….......34
9. Schematic Diagram……………...…………………...35
9.1 Main Board……………..…..………………………..35
9.2 Power Board.............….....................................46
10.Exploded View……………….....................…..48
11. BOM List…............................................................49
12. Different Parts List.................................................74
Table Of Contents.......……..............................…........1
Revision List.…........................................……......2
1. Monitor Specification..................................………........3
2. Operating Instructions……………...……….……….......4
2.1 The Use Of Remote Control..……………...................4
2.2 Front Panel Control Knobs.…...............……...............5
2.3 OSD Operations…...………........................…............6
3 Input/Output Specification…………..........................10
3.1 Input Signal Connector……......................................10
3.2 RGB Input Signal Timing …….....……......................11
4. Mechanical Instructions………………...…..................12
5. Repair Flow Chart ……………………….……….....18
6. White Balance Luminance Adjustment….……..........23
7. PCB Layout ………….…………………….…....….......25
CAUTION: USE A SEPARATE ISOLATION TRANSFOMER FOR THIS UNIT WHEN SERVICING
R FOR TH
UNIT WHEN S
CI

27’’ LCD TV Color Monitor TCL LCD27VN
2
Revision List
Version
Release Date
Revision Instructions
TPV Model
A00
Oct.-25-2006
Initial Release
EF84MGNKB2TLTMP
EF84MGNKB2TL2M

27’’ LCD TV Color Monitor TCL LCD27VN
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1. Monitor Specifications
Items
Specification
LCD Panel
Screen Size
27” TFT LCD color Panel (CMO)
Aspect Ratio
16:9
Resolution
1366 x 768 (WXGA)
Active Display Area H x V
596.259mm x 335.232mm
Pixel Pitch
0.4365mm ×0.4365mm
Display colors
16.7 million
Contrast Ratio
1000:1 (Typical)
Brightness
550 cd / m²(Typical)
Viewing Angle
176°(Horizontal) / 176°(Vertical)
Response Time
8 ms
Lamp Lifetime
60,000 hr
Color Temperature
Cool / Warm
TV Function
TV Tuning System
NTSC 181 Channel (PLL band) electronic adjustment system
Sound System
MTS + SAP
Color Systems
NTSC
Video Inputs
AV1
RCA x 1
Audio channel L/R x 1
AV2
RCA x 1
Audio channel L/R x 1
(Shared)
S-Video x 1
Component
YCbCr x 1
Audio channel L/R x 1
HDTV
YPbPr x 1
Audio channel L/R x 1
PC Input
Signal Input
Analog: D-Sub 15 pin (detachable cable)
PnP compatibility
DDC2B
Input frequency
Analog: FH: 31.5 KHz to 80 KHz
FV: 56 Hz to 75 Hz
Recommended
Analog: 1024 x 768 (60Hz)
Input Audio
Headphone Mini-jack for stereo (3.5 ø)
Audio Output
Audio Output: L / R
Speaker (built-in): Two 5 watt speakers
Headphone Mini-jack jack stereo (3.5 ø)
Line Output (RCA L/R)
OSD language
English, French and Spanish (default is Spanish)
Power
Power Supply
AC 110V~240V, 50/60 Hz
Power Consumption
<150 W
Panel Tilt
Forwards/Backwards/ Rotation
-5° / +20°/ ±35°
Environment
Operating Temp.
+ 0 °C ~ + 40 °C
Storage Temp.
- 10 °C ~ + 60 °C
Operating Humidity
10% ~ 85%
Dimension
W x H x D (with stand)
898 x 500x285(mm)
Weight
With Stand
13.4Kg
Accessories
D-Sub Signal Cable, AC Power cord, 3.5mm Audio cable, Remote Controller, Battery (x2),
User’s manual

27’’ LCD TV Color Monitor TCL LCD27VN
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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,
120 minutes. The timer
begins to count down from
the number of minutes
selected after the display has
disappeared.
SWAP
Press to swap the two
screens when PIP or
POP is work
2. Operations Instructions
2.1 The Use Of Remote Control
POWER:
Press to turn on/off the TV. The TV
is never completely powered off
unless it is physically unplugged.
0~9/100 Digit buttons
To select a TV channel.
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.
SIZE
Display the graphic
in 16:9 or 4:3 mode
PIP
ON/OFF
Used to switch the PIP
function ON or OFF
MUTE
Temporarily interrupt
the sound or restore it.
DISPLAY
Press this button to
Display Channel
number on the right-top
corner.
MTS
Press this key to
activate Multichannel
Television Sound,
Stereo or Mono sound.
PRE-CH
To display the previously
selected TV channel.
TV/VIDEO
Select your input source: press
TV/VIDEO and ▲, ▼, ◄, ► to
select TV,S-VIDEO, AV1, AV2,
COMPONENT,VGA(PC) or
HDTV mode, according to
where you connected your
external source.
AV1/AV2 for a VCR connected
to the AV connectors of the
TV.
S-VIDEO for a S-Video VCR
connected to the S-VIDEO
connector of the TV.
COMPONENT and HDTV
input via Y,Cb,Cr / Y,Pb,Pr on
the DVD Player or set top
box.
VGA For PC mode
CAPTION
Press this button to turn
Closed Caption on.
MENU, ▲, ▼, ◄, ►
These buttons are used to
display or adjust the various
functionalities.When the PIP
is ON but no menus are
available, use these ▲, ▼,
◄, ► to change the position
of the PIP.
.
V-CHIP
Use this button to define
the movies that this TV set
can receive
PIP/POP
Press this button to
display PC input and
other input on the
screen at the same time
PIP
TV/VIDEO
Select the signal source: If you
are in main picture or HDTV
mode, you can select audio1,
audio2, S-video, color contrast
or TV signal. Otherwise, you
can only select computer
graphics or HDTV.

27’’ LCD TV Color Monitor TCL LCD27VN
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2.2 Front Panel Control Knobs
Power Key: Press to turn on or off the TV.
MENU Key: Press to show the OSD menu and exit OSD menu at the TV.
Down / Up Key: Press to perform select function and channel.
Left / Right Key: Press to confirm your function selection and adjustment.
Source Key: Press to select your input source.

27’’ LCD TV Color Monitor TCL LCD27VN
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2.3 OSD Operations
TO USE THE MENUS
1. Press the MENU button repeatedly to display each menu
2. Use the cursor up/down to select a menu item or adjust the setting of Menu item.
3. Use the cursor left/right to enter a submenu or enable the function.
4. Press the MENU button to exit the menu.
MAIN MENU
Press the MENU button into the main OSD (On Screen Display). Adjust item include PICTURE PARAMETERS,
PC PARAMETERS, AUDIO SETTINGS, PICTURE-IN-PICTURE, CHANNEL SETTINGS, PARENTAL
CONTROLS and GENERAL SETTINGS.
PICTURE PARAMETERS
BRIGHTNESS: Adjust the brightness of the image.
CONTRAST: Adjust the contrast of the image.
SATURATION: Adjust the depth of color of the image.
HUE: Adjust the red/green hue of the image.
COLOR TEMP: Adjust the color temperature to your preference: 5000°, 6500°, 9300°K or select USER R, USER G,
USER B to define your personal settings.
FLESHTONE: The flesh tone is automatically adjusted, rendering a more natural color.
SHARPNESS: Adjust the sharpness of the video image for display accordingly.

27’’ LCD TV Color Monitor TCL LCD27VN
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PC PARAMETERS
AUTO CONFIG: Enable the automatic configuration of the optimum size of the graphic.
CLOCK: Adjust the time.
PHASE: Adjust the phase of the graphic.
POSITION: Adjust the position and angle of the graphic.
AUDIO SETTINGS
BASS: Adjust bass tone.
TREBLE: Adjust treble tone.
SRS: Switch SRS surround sound ON or OFF.
MTS: Select MONO, STEREO or SAP for bilingual setup.
MUTE: Temporarily mute the sound (can be done through remote control).

27’’ LCD TV Color Monitor TCL LCD27VN
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PICTURE-IN-PICTURE
PIP POSITION: The PIP can be placed in any position on the screen according to one’s wishes. If there is no
menu, use the ▲, ▼, ◄, ►buttons on the remote control to change the PIP position.
PIP SIZE: Can be used to switch the PIP off (OFF) or select the size (SMALL, MEDIUM, LARGE) of the PIP.
Can also be used to select one of two types (POP, PBP) of dual graphics.
CHANNEL SETTINGS
SYSTEM: Used to choose between (ANTENNA) or (CABLE).
PARENTAL CONTROLS

27’’ LCD TV Color Monitor TCL LCD27VN
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LOCK MENU: Switch the functionality to configure ratings on or off.
MPAA RATING: Configure MPAA ratings.
TV PG RATING: Configure TVPG ratings.
PASSWORD: Change the password (default is ‘1111”). Please follow the instructions on the screen. Once
changed, please remember your own password. If you have forgotten your password, please do the following:
“POWER (OFF) →MENU →V-CHIP →MUTE”to revert to the default password of 1111.
CAPTION
Press the “CAPTION” button on the remote to initiate the functionality list as shown on the left.
CC CONTROL: Switch the subtitles function ON or OFF.
MODE: Select mode of subtitles.
DISPLAY: Select display of subtitles.
GENERAL SETTINGS
OSD POSITION: Shift the position to one’s preference.
OSD TIMEOUT: Configure the time to be displayed on screen.
OSD LANGUAGE: Configure the language (English, French or Spanish) for the menu.
OSD LOCK: Lock the selected configurations to prevent them from being overwritten.
SLEEP TIMER: Configure the time for sleep mode.
INFORMATIONS : Display the resolution and H sync, V synch for the main graphic.。
FACTORY RESET: Select YES to revert to default configurations.
TRANSPARENCY: Adjust the brightness of the background.

27’’ LCD TV Color Monitor TCL LCD27VN
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3. Input/Output Specification
3.1 Input Signal connector
This procedure gives you instructions for installing and using the LCD TV display.
Lay the display on the desired operation and plug the power cord into a convenient AC outlet. Three-wire power
cord must be shielded and is provided as a safety precaution as it connects the chassis and cabinet to the electrical
conduct ground. If the AC outlet in your location does not have provisions for the grounded type plug, the installer
should attach the proper adapter to ensure a safe ground potential.
Connect the 15-pin D-SUB color display shielded signal cable to your signal system device and lock both screws on
the connector to ensure firm grounding. The connector information is as follow:
1
6
11
15
5
10
15 - Pin Color Display Signal Cable
Pin No.
Description
Pin No.
Description
1
Red Video
9
5V
2
Green Video
10
Sync Ground
3
Blue Video
11
Not Used
4
Not Used
12
Serial Data for DDC
5
Ground
13
H-Sync.
6
Red Ground
14
V-Sync.
7
Green Ground
15
Serial Clock for DDC
8
Blue Ground
Apply power to the display by turning the power switch to the "ON" position and allow about ten seconds for Panel
warm-up. The Power-On indicator lights "GREEN" when the display is on.
With proper signals feed to the display, a pattern or data should appear on the screen, adjust the brightness and
contrast to the most pleasing display, or press auto-adjust to get the best picture-quality.
This TV (with PC function) has power saving function following the VESA DPMS. Be sure to connect the signal
cable to the PC.
If your TV requires service, it must be returned with the power cord.

27’’ LCD TV Color Monitor TCL LCD27VN
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3.2 RGB Input Signal Timing
VGA MODES
Horizontal
Vertical
Resolution
Nominal
Frequency
(KHz)
Sync
Polarity
Nominal
Freq.
(Hz)
Sync
Polarity
720x400
31.5
N
70.1
P
640x480
31.5
N
59.9
N
640x480
37.9
N
72.8
N
640x480
37.5
N
75
N
800x600
37.9
P
60.3
P
800x600
48.1
P
72.2
P
800x600
46.9
P
75
P
1024x768
48.3
N
60
N
1280x1024
80
P
75
P

27’’ LCD TV Color Monitor TCL LCD27VN
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4. Mechanical Instructions
Step
Figure
Description
Preparation
Lay the LCD-TV
on a flat, soft and
clean surface.
Remove
hinge
cover
Remove the
hinge cover as
the arrowheads.
Remove
base
Remove the six
screws

27’’ LCD TV Color Monitor TCL LCD27VN
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Remove
cover cable
Push the clip as
the arrowheads
Remove
back cover
Remove the six
screws
Remove
cover chin
Remove the six
screws

27’’ LCD TV Color Monitor TCL LCD27VN
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Remove
shield
Remove the total
six screws
Remove
main board
Remove the four
scres and
disconnect he
wire harnesses

27’’ LCD TV Color Monitor TCL LCD27VN
15
Remove
power
board
Remove the six
screws and
disconnect the
wire harness
Remove
main frame
Remove the
fourteen screws
Remove
speakers
and bezel
Remove the
sixteen
screws(the left
and right two
speakers)

27’’ LCD TV Color Monitor TCL LCD27VN
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Remove
panel
Remove the four
screws

27’’ LCD TV Color Monitor TCL LCD27VN
17
Remove the four
screws
The end

27’’ LCD TV Color Monitor TCL LCD27VN
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5. Repair Flow Chart
Panel Control Circuit
No Display
Replace panel or
FPC cable to panel
Replace Q401, Q400
Check U403 crystal
X400 (14.318MHZ)
Replace X400
Check power supply for
1.8V, 2.5V, and 3.3V
Check relative circuit
Replace U403
OK
OK
OK
OK
NO 5V
NO Signal
NG
NG
Check CN605 pin 19-22
is 5V and signal on pin
3,4,6,7,9,10,12,13,15,16
Check Q401, Q400
relative circuit

27’’ LCD TV Color Monitor TCL LCD27VN
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Main Board Power Circuit
No Power
Check CN606
Pin 3, 4(12V),
Pin 5, 6 (5V)
Check Power Board circuit
Check U701 input (5V),
U706 input (12V)
Check Q701, Q702 and
PWR_ON control relative
circuit
U704 Pin2
(8V)
U700 Pin2
(1.8V)
U705 Pin2
(2.5V)
U701/U702/U703/U
704 Pin2 (2.5V)
OK
OK
OK
NG
NG

27’’ LCD TV Color Monitor TCL LCD27VN
20
Remote Control Block
Key Board Control Block
Press key no function
Check CN600 Pin6, 7, 8
voltage will change when key
be pressed
Check line between keyboard
and main board or U403
Check U403 and relative circuit
Replace keyboard
NG
NG
OK
Remote Control can’t work
Check IR Board J1 Pin 1,4(5V)
and voltage at Pin 3 will change
when received signal
Replace D600 or IR board
Check Main board 5V power
relative circuit and signal on
LP602
Check Power relative
circuit
Replace line between Main
board and IR Board or
replace U403
OK
OK
NG
NG