LG LM-270WF1-TLA1 Service manual
( ● ) Preliminary Specification
( ) Final Specification
LM270WF1
Liquid Crystal Display
Product Specification
SPECIFICATION
FOR
APPROVAL
27” Full HD TFT LCDTitle
BUYER
MODEL
www.jxlcd.com
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APPROVED BY
/
/
/
General
SIGNATURE
DATE
SUPPLIER LG. Display Co., Ltd.
*MODEL LM270WF1
SUFFIX TLA1
*When you obtain standard approval,
please use the above model name without suffix
APPROVED BY
H.S. Kim / G.Manager
REVIEWED BY
D.I. Chung / Manager
PREPARED BY
K.H. Lee / Engineer
SIGNATURE
DATE
Please return 1 copy for your confirmation with
your signature and comments.
Ver 0.0 July. 2. 2008
MNT Products Engineering Dept.
LG. Display LCD Co., Ltd
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LM270WF1
5
MECHANICAL CHARACTERISTICS
23
8
PACKING
28
Liquid Crystal Display
Product Specification
Contents
No ITEM Page
COVER
CONTENTS
RECORD OF REVISIONS
1 GENERAL DESCRIPTION
2 ABSOLUTE MAXIMUM RATINGS
3 ELECTRICAL SPECIFICATIONS
3-1 ELECTRICAL CHARACTREISTICS
3-2 INTERFACE CONNECTIONS
3-3 SIGNAL TIMING SPECIFICATIONS
3-4 SIGNAL TIMING WAVEFORMS
3-5 COLOR INPUT DATA REFERNECE
3-6 POWER SEQUENCE
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4 OPTICAL SFECIFICATIONS
6 RELIABLITY
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1
2
3
4
5
6
6
8
12
13
14
15
17
26
7 INTERNATIONAL STANDARDS
7-1 SAFETY
7-2 EMC
8-1 DESIGNATION OF LOT MARK
8-2 PACKING FORM
9 PRECAUTIONS 29
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27
27
27
28
28
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Product Specification
RECORD OF REVISIONS
LM270WF1
Liquid Crystal Display
Revision
No
0.0 July. 2. 2008 - First Draft(Preliminary)
Revision Date Page Description
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Ver 0.0 July. 2. 2008
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LM270WF1
qy py g
applications where thin thickness, wide viewing angle, low power are critical factors and graphic displays are
e
e
Back light Assembly
Power Consumption
Total
95
Watt (Typ.) (
Watt
@V
LCD
Watt
@400cd/
㎡
])
Liquid Crystal Display
Product Specification
1. General Description
LM270WF1 is a Color Active Matrix Liquid Crystal Display with an integral Cold Cathode Fluorescent
Lamp(CCFL) backlight system without inverter. The matrix employs a-Si Thin Film Transistor as the active
element. It is a transmissive type display operating in the normally black mode. It has a 27 inch diagonally
measured active display area with Full HD resolution (1080 vertical by 1920 horizontal pixel array)
Each pixel is divided into Red, Green and Blue sub-pixels or dots which are arranged in vertical stripes.
Gray scale or the brightness of the sub-pixel color is determined with a 8-bit gray scale signal for each dot,
thus, presenting a palette of more than 16,7M colors with Advanced-FRC (Frame Rate Control). . It has
been designed to apply the interface method that enables low power, high speed, low EMI. FPD Link or
compatible must be used as a LVDS (Low Voltage Differential Signaling) chip. It is intended to support
important. It is intended to support displays where high brightness, super wide viewing angle,
high color saturation, and high color are important.
RGB, Dclk, DE
Hsync, Vsync
(LVDS 2 port)
V
(12.0V)
LCD
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V
LAMP
CN1
(30pin)
CN 2
2pin x 8CNs (High)
Timing Control
Block
Gat
Driver circuit
Power Circuit Block
G1080
(Direct Light Type_ U shape 7 CCFL)
Figure 1. Block diagram
Source Driver Circuit
G1
TFT-LCD Panel
(1920 × 1080 pixels)
General Features
Active Screen Size 27 inches(68.6cm) diagonal
Outline Dimension 630(H) x 368.2(V) x 37.2(D) mm(Typ.) *Without Inverter
Pixel Pitch 0.3114 mm x 0.3114 mm
Pixel Format 1920 horiz. By 1080 vert. Pixels RGB stripes arrangement
S1920S1
Color Depth 8-bit with A-FRC, 16,777,216 colors
Luminance, White 400 cd/m
Viewing Angle(CR>10) View Angle Free (R/L 170(Typ.), U/D 160(Typ.))
Weight 4220 g (typ.)
Display Operating Mode Transmissive mode, normally White
Surface Treatment
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Hard coating(3H) & Anti-Glare treatment of the front polarizer
2
(Center 1 point)
88.
5.35
, 83.6
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Product Specification
The following
Wet bulb temperature should be 39
Max, and no condensation of water
R
2. Absolute Maximum Ratings
are maximum values which, if exceeded, may cause faulty operation or damage to the unit.
Table 1. ABSOLUTE MAXIMUM RATINGS
LM270WF1
Liquid Crystal Display
Parameter Symbol
Power Input Voltage
Operating Temperature
Storage Temperature
Operating Ambient Humidity
Storage Humidity
Note : 1. Temperature and relative humidity range are shown in the figure below.
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Wet Bulb
Temperature [C]
20
10
0
VLCD -0.3 12.4 Vdc at 25 ± 2°C
TOP 050
TST -20 60
HOP 10 90 %RH
HST 10 90 %RH
C
50
40
30
Values
Units Notes
Min Max
°C
°C
°
90%
60
60%
H]
40%
Humidity [(%)
10%
1
.
Storage
Operation
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10 20 30 40 50 60 70 800-20
Dry Bulb Temperature [C]
Figure 2. Temperature and relative humidity
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LM270WF1
3-1. El
445
468
Liquid Crystal Display
Product Specification
3. Electrical Specifications
ectrical Characteristics
It requires two power inputs. One is employed to power the LCD electronics and to drive the TFT array and
liquid crystal. The second input power for the CCFL, is typically generated by an inverter. The inverter is an
external unit to the LCDs.
Table 2-1. ELECTRICAL CHARACTERISTICS
Parameter Symbol Unit Notes
MODULE :
Power Supply Input Voltage V
Permissive Power Input Ripple V
Differential Impedance
Power Supply Input Current ILCD
Power Consumption
Rush current I
Note :
1. Permissive power ripple should be measured under VCC=12.0V, 25°C, fV(frame frequency)=MAX
condition and At that time, we recommend the bandwidth configuration of oscilloscope is to be under
20Mhz. See the next page.
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LCD
dRF 400 mVp-p 1
Zm 90 100 110 Ohm
Pc TYP -
Pc MAX -
RUSH --3.0A4
Min Typ Max
11.6 12.0 12.4
-
-
Values
559 592
5.35 5.62
6.71 7.10
Vdc
mA 2
mA 3
Watt 2
Watt 3
2. The specified current and power consumption are under the V
whereas Mosaic and max power pattern shown in the [ Figure 3 ] is displayed.
3. The current is specified at the maximum current pattern.
4. Maximum Condition of Inrush current :
The duration of rush current is about 2ms and rising time of Input Voltage is 1ms(min.).
At any rising time of Input voltage, Keep the I2T Value by below Condition
Condition : I2T < 32*2ms
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=12.0V, 25 ± 2°C,fV=60Hz condition
LCD
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Liquid Crystal Display
g
ppp
Product Specification
• Permissive Power input ripple (VCC=5.0V, 25°C, fV(frame frequency)=MAX condition)
LM270WF1
White pattern
• Power consumption (VCC=5.0V, 25°C, fV (frame frequency=60Hz condition)
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Typical power Pattern
Figure 3. Mosaic pattern & Black Pattern for power consumption measurement
Black pattern
Max power Pattern
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Product Specification
Otherwise, the lamps may not be turned on
The used lamp current is the lamp typical current
diti
±
2°C
Table 2_2. ELECTRICAL CHARACTERISTICS
LM270WF1
Liquid Crystal Display
Parameter Symbol
LAMP :
Operating Voltage VBL 1900(7.0mA) 1990(6.0mA) 2250(3.0mA) V
Operating Current I
Established Starting Voltage Vs 1, 3
at 25 °C
at 0 °C
Operating Frequency
Discharge Stabilization Time
Power Consumption
Life Time
Note : The design of the inverter must have specifications for the lamp in LCD Assembly.
The performance of the Lamp in LCM, for example life time or brightness, is extremely influenced by
the characteristics of the DC-AC inverter. So all the parameters of an inverter should be carefully
designed so as not to produce too much leakage current from high-voltage output of the inverter.
When you design or order the inverter, please make sure unwanted lighting caused by the mismatch
of the lamp and the inverter (no lighting, flicker, etc) never occurs. When you confirm it, the LCD–
Assembly should be operated in the same condition as installed in you instrument.
※ Do not attach a conducting tape to lamp connecting wire.
If the lamp wire attach to a conducting tape, TFT-LCD Module has a low luminance and the inverter
has abnormal action. Because leakage current is occurred between lamp wire and conducting tape.
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BL 3.0 6.0 7.0 mA
fBL 40 - 80 kHz 4
Ts 3.0 Min 1, 5
PBL 47.3 83.6 93.1 Watt 6
Min Typ Max
- - 3000 V
- - 3600 V
40,000 Hrs 1, 7
Values
Unit Notes
RMS
RMS
RMS
RMS
1, 2
1
1. Specified values are for a single lamp.
2. Operating voltage is measured at 25 ± 2°C. The variance of the voltage is ± 10%.
3. The voltage above V
(Inverter open voltage must be more than lamp starting voltage.)
4. Lamp frequency may produce interface with horizontal synchronous frequency and as a result this may
cause beat on the display. Therefore lamp frequency shall be as away possible from the horizontal
synchronous frequency and from its harmonics in order to prevent interference.
5. Let’s define the brightness of the lamp after being lighted for 5 minutes as 100%.
T
is the time required for the brightness of the center of the lamp to be not less than 95%.
S
6. The lamp power consumption shown above does not include loss of external inverter.
The used lamp current is the lamp typical current. (P
7. The life is determined as the time at which brightness of the lamp is 50% compared to that of initial
value at the typical lamp current on con
Ver 0.0 July. 2. 2008
should be applied to the lamps for more than 1 second for start-up.
S
.
= VBLx IBLx N
BL
on of continuous operating at 25
Lamp
)
.
.
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LM270WF1
symmetrical current waveform (Unsymmetrical ratio is less than 10%). Please do not use the inverter
Liquid Crystal Display
Product Specification
8. The output of the inverter must have symmetrical(negative and positive) voltage waveform and
which has unsymmetrical voltage and unsymmetrical current and spike wave.
Requirements for a system inverter design, which is intended to have a better display performance, a
better power efficiency and a more reliable lamp, are following.
It shall help increase the lamp lifetime and reduce leakage current.
a. The asymmetry rate of the inverter waveform should be less than 10%.
b. The distortion rate of the waveform should be within √2 ±10%.
* Inverter output waveform had better be more similar to ideal sine wave.
* Asymmetry rate:
I p
|I
p–I–p
|/I
rms
x 100%
I -p
9. The inverter which is combined with this LCM, is highly recommended to connect coupling(ballast)
condenser at the high voltage output side. When you use the inverter which has not coupling(ballast)
condenser, it may cause abnormal lamp lighting because of biased mercury as time goes.
10.In case of edgy type back light with over 4 parallel lamps, input current and voltage wave form should
be synchronized
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* Distortion rate
I
(or I–p)/I
p
rms
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LM270WF1
()
15
SR1M
Minus signal of even channel 1 (LVDS)
30
V
LCD
Power Supply +12.0V
Liquid Crystal Display
Product Specification
3-2. Interface Connections
This LCD employs Two interface connections, a 30 pin connector is used for the module electronics and a
14Pin Connector is used for the integral backlight system.
3-2-1. LCD Module
- LCD Connector(CN1): KDF71G-30S-1H, (Manufactured by Hirose )
- Mating Connector : FI-X30C2L (Manufactured by JAE) or Equivalent
Table 3 MODULE CONNECTOR(CN1) PIN CONFIGURATION
No Symbol Description No Symbol Symbol
1
2
3
4
5
6
7
8
9
10
11
12
13
14
FR0M
FR0P
FR1M
FR1P
FR2M
FR2P
GND
FCLKINM
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FCLKINP
FR3M
FR3P
SR0M
SR0P
GND
Minus signal of odd channel 0 (LVDS)
Plus signal of odd channel 0 (LVDS)
Minus signal of odd channel 1 (LVDS)
Plus signal of odd channel 1 (LVDS)
Minus signal of odd channel 2 (LVDS)
Plus signal of odd channel 2 (LVDS)
Ground
Minus signal of odd clock channel (LVDS)
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Plus signal of odd clock channel (LVDS)
Minus signal of odd channel 3 (LVDS)
Plus signal of odd channel 3 (LVDS)
Minus signal of even channel 0 (LVDS)
Plus signal of even channel 0 (LVDS)
Ground
16
SR1P
17
GND
18
SR2M
19
SR2P
20
SCLKINM
21
SCLKINP
22
SR3M
23
SR3P
24
GND
25
NC
26
NC
27 DCR_OUT
28
ODC
29
VLCD
Plus signal of even channel 1 (LVDS)
Ground
Minus signal of even channel 2 (LVDS)
Plus signal of even channel 2 (LVDS)
Minus signal of even clock channel (LVDS)
Plus signal of even clock channel (LVDS)
Minus signal of even channel 3 (LVDS)
Plus signal of even channel 3 (LVDS)
Ground
No Connection
No Connection
Dynamic C/R output
ODC Control (GND:DCR on, 3.3V:DCR off)
Power Supply +12.0V
Note: 1. All GND(ground) pins should be connected together and to Vss which should also be connected to
the LCD’s metal frame.
2. All V
LCD (power input) pins should be connected together.
3. Input Level of LVDS signal is based on the IEA 664 Standard.
Rear view of LCM
#1 #30
KDF71G-30S-1H
Ver 0.0 July. 2. 2008
#1 #30
[ Figure 4 ] Connector diagram
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