Acer XB270HU User manual

A CER_LCD_XB270HU_SM20 150112V1

Contents
Table of Contents
Important Safety Notice.....................................................................................................................................................1
1. Product Specification.....................................................................................................................................................2
2. OSD Menu....................................................................................................................................................................13
3. Exploded Diagram.......................................................................................................................................................14
4. Assembly and Disassembly Procedures..................................................................................................................17
5. Troubleshooting............................................................................................................................................................24
6. Firmware Upgrade Process........................................................................................................................................28
7. Writing EDID Process..................................................................................................................................................40
8. FRU (Field Replaceable Unit) List.............................................................................................................................41
9. Mylar..............................................................................................................................................................................44
Safety Notice
Any person attempting to service this chassis must familiarize with the chassis and be aware of the necessary safety
precautions to be used when serving electronic equipment containing
high voltage.

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Important Safety Notice
Product Announcement:
This product is certificated to meet RoHS Directive and Lead-Free produced definition. Using approved
critical components only is recommended when the situation to replace defective parts. Vender assumes no
liability express or implied, arising out of any unauthorized modification of design or replacing non-RoHS
parts. Service providers assume all liability.
Qualified Reparability:
Proper service and repair is important to the safe, reliable operation of all series products. The service
providers recommended by vender should being aware of notices listed in this service manual in order to
minimize the risk of personal injury when perform service procedures. Furthermore, the possible existed
improper repairing method may damage equipment or products. It is recommended that service
engineers should have repairing knowledge, experience, as well as appropriate product training per new
model before performing the service procedures.
NOTICE:
! To avoid electrical shocks, the products should be connect to an authorized power cord, and turn off
the master power switch each time before removing the AC power cord.
! To prevent the product away from water or exposed in extremely high humility environment.
! To ensure the continued reliability of this product, use only original manufacturer’s specified parts.
! To ensure following safety repairing behavior, put the replaced part on the components side of PWBA,
not solder side.
! To ensure using a proper screwdriver, follow the torque and force listed in assembly and is
assembly procedures to screw and unscrew screws.
! Using Lead-Free solder to well mounted the parts.
! The fusion point of Lead-Free solder requested in the degree of 220°C.

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1. Product Specification
1.1 Monitor Overview:
1.1.1 Monitor Specification

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1.1.2 Electrical block diagram:
This section describes the electrical requirement of the monitor. Below is the block diagram.
The LCD monitor will contain a main board, a power board, an USB board and a key board which house
the flat panel control logic, brightness control logic and DDC. The power board will provide DC to DC
Inverter voltage to drive the backlight of panel. The function key board is used for OSD control, monitor
power ON/OFF and the LED indicator for power status.
1.1.3 Test Condition:
All tests must be performed under “standard testing conditions” unless otherwise specified.
Test Equipment: CHROMA 6630.
Warm up time > 30 min.
AC supply voltage 220V± 5%, 50± 3 Hz
Ambient temperature 20C 5C
Humidity 50% 10%
Display mode 2560 x 1440, 60 Hz, Pixel Clock: 538MHZ,all white
e-color mode Set to “User” mode
Contrast control Set to factory preset value, which allows that the brightest two of 32
linear distributed gray-scales (0～700mv) can be distinguished.
Color temperature 6500°K
Brightness control The value under user mode
Analog Input signal 700 mVss
Picture position and size Factory preset value
Viewing angle 90 ° H and 50 °V
Viewing distance 40 cm for LCD performance, 20 cm for LCD failures
Ambient illumination Dark room (< 1 cd/m2)
AC-IN 100V-240V
Power board
Flat Panel and
LED backlight
Main Board
RS232 Connector
For white balance
adjustment in factory
mode
LED Drive.
Video signal, DDC
HOST Computer
Key Board
USB Board

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1.1.4 Interface Connectors:
DP

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1.1.5 Input Signals:
Video Input Signals Range (Analog RGB Signal)
No. S y mbo l Item M i n Ma x Uni t
1 Fh Ho rizontal F r equen cy 30 140 k Hz
2
F
v Ver t ic al F r e
q
uen c
y
30 70 Hz
3
F
c l k Pi
x
el Clock F r e
q
uen c
y
148.5 MHz
4 V i h Hi
g
h Le
v
el I n
p
u t 2.4 5 V
5 V il Low Le vel Inpu t 0 0.8 V
6 V i deo RGB Ana l o g V i deo Le v e l 0 0.7 V
Video Signal Amplitudes:
The video inputs consist of Red, Green and Blue signals each has its own coaxial cable terminated at the monitor.
These video signals are analog levels, where 0V corresponds to black, and 700mV is the maximum signal
amplitude for the respective color. The video signal is terminated with 75 ohms.
Video Signal Termination Impedance:
The analog video signal termination shall be 75 ohm.
Synchronization (Sync) Signals:
The Horizontal Sync (HS) TTL signal is used to initiate the display of a horizontal line. HS may be either active high
or active low according to the timing. The Vertical Sync (VS) TTL signal is used to initiate the display of a new
frame. VS may be either active high or active low according to the timing.

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1.1.6 Monitor Modes and Timing Capability:
Factory Assigned Display Modes:

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1.1.7 Mechanical and Packing:
Monitor Packed Monitor
Width: 623.7mm TBD
Height: 401.15~551.15mm TBD
Depth: 245.25mm TBD
Weight: TBD TBD
Dimension (mm):
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1.2 Panel Specification:
1.2.1 Flat Panel
This specification applies to the 27 inch-QHD color a-Si TFT-LCD Module M270DAN0. The display supports the
QHD - 2560(H) x 1440(V) screen format and 1.07B colors. The light source of this TFT-LCD module is W-LED. All
input signals are 4-port LVDS interface and this module doesn’t contain a driver for backlight.
General display parameters:
Active Screen Size 27.0 inches(68.47cm) diagonal
Screen Diagonal 684.7 (27.0”)
Active Area 596.7 (H) x 335.6 (V)
Pixels H x V 2560(x3) x 1440
Pixel Pitch 233.1 (per one triad) ×233.1
Pixel Arrangement R.G.B. Vertical Stripe
Display Mode Normally Black
White Luminance ( Center ) 350 cd/m2 (Typ.)
Contrast Ratio 1000 (Typ.)
Optical Response Time 12ms (Typ., G/G)
Nominal Input Voltage VDD + 5.0 V
Power Consumption
(VDD line + LED line)
31.9 W (typ)
VDD line : PDD (typ), All white pattern at 60Hz = 5.0W
LED line : PBLU (typ) = 26.9 W
Weight 2,319g (Typ.)
Physical Size（mm）630.0 (W) x 368.2 (H) x 10.6(D) (Typ.)
Electrical Interface 4 channel LVDS
Support Color 1.07B colors
Surface Treatment Anti-Glare, 3H
Temperature Range
Operating Storage (Shipping)
0 to +50
-20 to +60
RoHS Compliance RoHS Compliance
TCO Compliance TCO 6.0 Compliance

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Optical Characteristics:
Ta= 25°C
1.2.2 Backlight Requirements:

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1.2.3 Defect Terminology:
Dark Spots / Lines: Spots or lines that appear dark in the display patterns and are usually the result of
contamination. Defects do not vary in size or intensity (contrast) when contrast voltage is varied. Contrast
variation can be achieved through the use of varying gray shade patterns.
Bright Spots / Lines: Spots or lines that appears light in the display patterns. Defects do not vary in size or
intensity (contrast) when contrast voltage is varied. Contrast variation can be achieved through the use of
varying gray shade patterns.
Polarizer Scratch: When the unit lights, lines appear light (white) with display patterns dark and do not
vary in size. Physical damage to the polarizer does not damage the glass.
Polarizer Dent: When the unit lights, spots appear light (white) with display patterns dark and do not vary
in size. Physical damage to the polarizer does not damage the glass.
Rubbing Line: Horizontal or diagonal lines that appear gray with the display patterns dark and may have
resulted from an “out of control” rubbing process on the polyimide or “waves” on the BEFs or prism sheets .
Newton Ring: The “rainbow” effect caused by non-uniform cell thickness.
Mottling: When the unit lights, variation / non - uniformity (splotch) appears light (white) with the display
and might vary in size.
Dim Line: When the unit lights, line(s) in the minor (vertical) or major (horizontal) axis appear dim, but not
completely on or off.
Cross Lines Off: When the unit lights , lines in both the minor and major axis do not appear.
Bright/Dark Dot: A sub - pixel (R, G, B dot) stuck off / on (electrical).
1.2.4 Optical Characteristics:
Note 1 Measurement method
The LCD module should be stabilized at given temperature for 30 minutes to avoid abrupt temperature change
during measuring (at surface 35℃). In order to stabilize the luminance, the measurement should be executed
after lighting Backlight for 30 minutes in a stable, windless and dark room.
Note 2 Definition of Viewing Angle (x, y):
Viewing angle is the measurement of contrast ratio ≧10, at the screen center, over a 180° horizontal and
180° vertical range (off-normal viewing angles). The 180° viewing angle range is broken down as follows;
90° () horizontal left and right and 90° () vertical, high (up) and low (down). The measurement direction is
typically perpendicular to the display surface with the screen rotated about its center to develop the desired
measurement viewing angle.

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Note 3 Definition of Response Time (TR, TF):
The output signals of photo detector are measured when the input signals are changed from “Full Black” to
“Full White” (rising time, TrR), and from “Full White” to “Full Black” (falling time, TfF), respectively. The
response time is interval between the 10% and 90% (1 frame at 60 Hz) of amplitudes.
TrR + TrF = 5 msec (typ.).
TrR + TfF = 12 msec (typ.).
Algorithm:┃Gray Level A – Gray Level B┃≧16, then the average gray to gray response time is 2ms,(F= 60
Hz).
Note 4 Luminance uniformity of these 9 points is defined as below and measured by TOPCON SR-3

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Note 5 Crosstalk is defined as below and measured by TOPCON SR-3
Note 6 Test Pattern: Sub checker Pattern measured by TOPCON SR-3
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2. OSD Menu
2.1 Key Definition:
1.Power Switch/ Power LED To turn ON or OFF the power. Lights up to indicate the power is turned ON.
2.>/(Input) 1) Activate OSD First menu when OSD is OFF.
2) Press > to select the desired function.
3) Press > to change the settings of the current function.
4) When First menu is on, press >(Input) key to change source.
3. .</Volume 1) Activate OSD First menu when OSD is OFF.
2) Press <to select the desired function.
3) Press <to change the settings of the current function.
4) When First menu is on, press < (AUDIO) key to select audio.
4. Menu/Enter 1) Activate OSD First menu when OSD is OFF.
2) Activate/de-activate adjustment function when OSD is ON.
5.Auto / Exit 1) Activate OSD First menu when OSD is OFF.
2) When OSD menu is in active status, this button will act as EXIT-KEY
(EXIT OSD menu).
3) When exit eColor OSD, it will activate the Auto Adjustment function
automatically.
6.Empowering 1) Activate OSD First menu when OSD is OFF.
2) Trigger the acer eColor Management when first menu is active.

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3. Exploded Diagram
3.1 Product Exploded Diagram:
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Note: The parts information listed below are for reference only, and are subject to change without notice. Please go
to http://cs.tpv.com.cn/hello1.asp for the latest information.
Item Description TPV Part No. Acer Part No.
1 BEZEL Q34G7946AEMC2L0101 N/A
2 LENS_POWER A33G1461 2 1C0100 N/A
3 KEY A33G1545AEM01L0100 N/A
4 KEY BOARD KEPCEQK7 N/A
5 PANEL 750GBU270A230JN000 N/A
6 SCREW 0M1G1140 6120 N/A
7 SCREW 0M1G1030 6120 N/A
8 SCREW 0Q1G1030 6120 N/A
9 INSULATING SHEET Q52G1801MNT204AFZA N/A
10 POWER BOARD PLPCDK571GQBK N/A
11 STAND_BUTTON A33G1463AEM 1L0100 N/A
12 MAIN BOARD 756GQEUS0BA003000Q N/A
13 USB BOARD USBEQKK N/A
14 REAR_COVER Q34G7941AEM03S0100 N/A
15 STAND-BASE ASS'Y Q37G042120130100FH N/A
16 INSULATING SHEET Q52G1801MNT105AFZA N/A
17 MAINFRAME Q15G143930130100AJ N/A
18 SCREW 0M1G2940 10 47 CR3 N/A
19 SCREW 0M1G3030 6120 N/A
20 SCREW 0M1G3030 6120 N/A
21 SCREW 0D1G1030 6120 N/A
22 SPRING Q19G5023 1 N/A
23 LATCH A34G3241AEM01X0100 N/A

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3.2 Packing Exploded Diagram:
ITEM DESCRIPTION QT'S
1
2
3
4
5
6
7
8
9
10
11
12
13
CARTON
EPS-1
EPS-2
EPE BAG FOR MONITROT
HEAR OF MONITOR
PE BAG FOR BASE
BASE
POWER CABLE
SIGNAL CABLE
WARRANTY CARD
CD
1
1
1
1
1
1
1
1
1
1
1
1
1
14
QSG
PE BAG FOR STAND
DVI CABLE
EPS-3 1
1
1
1
STAND
1
AUDIO CABLE
15
16
17 1
1
DP CABLE
18 1
1
USB CABLE
19 1
HDMI CABLE
20

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4. Assembly and Disassembly Procedures
4.1 Assembly Procedures:
Prepare a main board, a power board and a USB board. Connect the boards.
Prepare a main frame and some screws. Use a Philips-head screwdriver to tighten the screws till the
boards with shield are firmly attached.
Prepare a MYLAR, assemble it onto the power board.
S1
S3
S2

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Use a Hex-head screwdriver to tighten the screw for locking the connectors.
Prepare a bezel and key board. Assemble bezel and key board aim the active position. Prepare a panel. Put
panel into bezel.
Put the Mylar slice（Note：refer to the last page）marked with information of mainframe position on the panel.
Mylar slice edge must be against the bezel. Put the mainframe along the mark. Holding the mainframe while
you are removing the Mylar and pasting the tapes. Connect the LVDS cables (main board to panel), lamp
power cable (main board to panel).
Prepare a rear cover to assemble it.
S6
S7
S4
S5
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