Acer AL2623W User manual
Acer Service Manual
Service Manual
LCD Monitor Acer AL2623W
- 0 -
1
1
Service Manual Versions and Revision
No. Version Release Date Revision
1
1.0
2006/09/20
Initial Release
Copyright
Copyright 2006 InnoLux Tech. Corp. Ltd
All Rights Reserved
This manual may not, in whole or in part, be copied, Photocopied, reproduced, translated, or converted to any
electronic or machine readable form without prior written permission of InnoLux Tech. Corp. Ltd.
Acer AL2623 Service Manual
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Table of Contents
CHAPTER 1- PRECAUTIONS & SAFETY NOTICES ..................................................................................................................... 3
1. SAFETY PRECAUTIONS .................................................................................................................................................... 3
2. PRODUCT SAFETY NOTICE.............................................................................................................................................. 3
3. SERVICE NOTES.................................................................................................................................................................. 3
CHAPTER 2- SERVICE TOOLS & EQUIPMENT REQUIRED ..................................................................................................... 4
CHAPTER 3- CIRCUIT THEORY .......................................................................................................................................................5
1. FUNCTIONAL BLOCK DIAGRAM...............................................................................................................................................6
2. ELECTRONIC CIRCUIT THEORY ............................................................................................................................................... 5
3. INVERTER CIRCUIT THEORY-INL .............................................................................................................................................. 7
CHAPTER 4- DISASSEMBLY & ASSEMBLY ................................................................................................................................. 10
1. EXPLODED DIAGRAM ........................................................................................................................................................... 10
2. DISASSEMBLY BLOCK ........................................................................................................................................................... 11
3. ASSEMBLY BLOCK ................................................................................................................................................................ 12
CHAPTER 5- TEST AND ADJUSTMENT ........................................................................................................................................ 13
1. GENERAL POINTS ............................................................................................................................................................. 13
2. INPUT SIGNAL .................................................................................................................................................................. 14
3. FUNCTION CHECK........................................................................................................................................................... 16
4. DISPLAY CHECK............................................................................................................................................................... 17
5. PICTURE CHECK............................................................................................................................................................... 18
CHAPTER 6- TROUBLE SHOOTING.............................................................................................................................................. 21
1. NO POWER &LED OFF ....................................................................................................................................................... 21
2. 18VDC OUTPUT VOLTAGE IS UNSTABLE ................................................................................................................................. 22
3. 5VDC OUTPUT POWER IS UNSTABLE....................................................................................................................................... 23
4. 5VDC OUTPUT POWER IS UNSTABLE....................................................................................................................................... 24
5. AL2016W BACKLIGHT CAN'T BE TURNED ON(INL INVERTER) ................................................................................................. 25
6. TROUBLESHOOTING LIST-TDK INVERTER ............................................................................................................................... 26
ATTACHMENT 1- BILL OF MATERIAL......................................................................................................................................... 27
ATTACHMENT 2- SCHEMATIC....................................................................................................................................................... 40
ATTACHMENT 3- PCB LAYOUT ..................................................................................................................................................... 49
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Chapter 1- PRECAUTIONS & SAFETY NOTICES
1. SAFETY PRECAUTIONS
This monitor is manufactured and tested on a ground principle that a user’s safety comes first.
However, improper used or installation may cause damage to the monitor as well as to the user.
WARNINGS:
zThis monitor should be operated only at the correct power sources indicated on the label on the rear
of the monitor. If you’re unsure of the power supply in you residence, consult your local dealer or
Power Company.
zDo not try to repair the monitor by yourself, as it contains no user-serviceable parts. This monitor
should only be repaired by a qualified technician.
zDo not remove the monitor cabinet. There are high-voltage parts inside that may cause electric
shock to human bodies.
zStop using the monitor if the cabinet is damaged. Have it checked by a service technician.
zPut your monitor only in a lean, cool, dry environment. If it gets wet, unplug the power cable
immediately and consult your closed dealer.
zAlways unplug the monitor before cleaning it. Clean the cabinet with a clean, dry cloth. Apply
non-ammonia based cleaner onto the cloth, not directly onto the class screen.
zDo not place heavy objects on the monitor or power cord.
2. PRODUCT SAFETY NOTICE
Many electrical and mechanical parts in this chassis have special safety visual inspections and the
protection afforded by them cannot necessarily be obtained by using replacement components rated
for higher voltage, wattage, etc. Before replacing any of these components read the parts list in this
manual carefully. The use of substitute replacement parts, which do not have the same safety
characteristics as specified in the parts list, may create shock, fire, or other hazards.
3. SERVICE NOTES
zWhen replacing parts or circuit boards, clamp the lead wires around terminals before soldering.
zKeep wires away from high voltage, high temperature components and sharp edges.
zKeep wires in their original position so as to reduce interference.
zAdjustment of this product please refers to the user’ manual.
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Chapter 2- SERVICE TOOLS & EQUIPMENT REQUIRED
1. SIGNAL GENERATOR
2. MULTIMETER
3. SCREW DRIVER
4. OSCILLOSCOPE
5. Soldering IRON
6. SOLDER
7. VGA Cable (15pins point to point)
8. Color Analyzer
9. Myson412 ISP Board
10. EDID Board
11. EDID program file
Acer Service Manual
CHAPTER 3-CIRCUIT THEORY
1. Monitor Block Diagram
The LCD Monitor contains an interface board, and inverter/power/Audio board, keypad board and flat panel.
In Inverter/power/Audio board, power section supplies +14V & +5V for Inverter/Audio and Interface board
used. The inverter section drives the backlight of panel and the DC-DC conversion. The Audio section
drives speaker (2 x1W).
Power/Audio BD
(Including AC/DC Power
Supply and Audio)
Interface Board (VGA input)
Keypad BD
Flat panel (LVDS interface) and CCFL(Including
Inverter BD)
AC input
Range 100V~240V
Host computer
(VGA signal input and DDC)
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2. Interface BOARD DIAGRAM
6
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3. Electronic Circuit Theory
3.1 Switching Mode Power Supply
3.1.1 AC Current Input Circuit
P801 is a connector for connecting AC Power. F801 is a fuse to protect all the circuit. AC input
voltage is from 90v to 264V. SW801 is hard switch for control AC input.
C867/C802/C832/C866 are safety Y capacitors. C803/C804 are safety X capacitors. R801､
R802 and R803 joined between two inputting main circuit to discharge electric energy of C804
when power AC off. L801/L802 are used to clear up low frequency wave. High frequency
waves are damped by C867 and C802. D801 is a rectifier build-in 4 diodes. It Transform AC to
DC.
3.1.2 Power Factor Controller Circuit
This circuit is typical boost model PWM power to improve power factor. T801 is inductor to
storage electric energy. T801 store energy when Q801 switch on. And T801 discharge energy
when Q801 switched off. R804､R805､R806､R808､ZD802､R807､R822 and Q802 control
PFC output DC voltage. PFC output voltage is 400V when AC input is 180V~240V. Output
voltage is 280V when AC input is 100~160V. R817､R818､R819 and R821 control PFC out
stabilization. The pin function of IC801 can find from component datasheet.
3.1.3 High DC Voltage to Low Voltage (5V) Control Circuit
IC805 is this DC-DC circuit PWM controller. When pin6 of IC805 be charged to 12V, IC803
start drive Q805 to transform high DC voltage to low DC voltage 5V.D812､R865､Q806､
D814､C836 and C837 provide auxiliary power for IC803 normal operation. R862 and R861
sample from auxiliary winding to control over voltage protection for DC 5V output. R873 and
R872 sample DC 5V output voltage to compare voltage level with reference voltage of IC807.
The signal get from compared result via IC806 feed back to pin2 of IC805. Then control PWM
duty to control DC output stabilization. T803 is transformer. D815 is rectifier for DC 5V output.
C843 and C844 are filter for DC 5V.
3.1.4 High DC Voltage to Low Voltage (24V) Control Circuit
This circuit same section 3.1.3. IC802 is this DC-DC circuit PWM controller. When pin6 of
IC802 be charged to 12V, IC802 start drive Q803 to transform high DC voltage to low DC
voltage 24V.D806､Q804､C818 and C815 provide auxiliary power for IC802 normal operation.
R832 and R831 sample from auxiliary winding to control over voltage protection for DC 24V
output. R843､R851 and R842 sample DC 24V output voltage to compare voltage level with
reference voltage of IC804. The signal get from compared result via IC803 feed back to pin2 of
IC802. Then control PWM duty to control DC output stabilization. T802 is transformer. D807
and D810 are rectifiers for DC 24V output. C825 and C826 are filter for DC 24V.
3.1.5 DC_24V Transform to DC 12V Circuit
IC808 is this DC-DC circuit PWM controller. R883 is for output short protection. C854 adjust
resonance frequency. R887 and R886 sample DC output 12V to feed back to pin5 of IC808.
Then control duty width to drive Q807. L806 is storage inductor. C856 is filter.
3.1.6 Over Current Protect Circuit
IC811 is the OCP controller. R875､R876､R877､R878 and R879 are sample resistor for DC 5V
output. When the voltage of IC808 pin9 higher than the pin8, pin14 output high level to via
D821､IC812 and IC809 control IC801 and IC802 shut down; R889､R890､R891､R892 and
R893 are sample resistor for DC 12V output. When the voltage of IC808 pin7 higher than the
pin6,pin1 output high level to via D820､IC812 and IC809 control IC801 and IC802 shut down;
R846､R845､R847､R848 and R849 are sample resistor for DC 24V output. When the voltage
of IC808 pin5 higher than the pin4, pin2 output high level to via D809､IC812 and IC809
control IC801 and IC802 shut down;
3.1.7 Standby Power Controller Circuit
When standby power signal is high level, Q811 on, Q810 off, IC809 off, Q808 and Q812 off,
Q809 on, so power system on. When standby power signal is low level, Q811 off, Q810 on,
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IC809 on, Q808 and Q812 on, Q809 off, so IC801 and IC802 shut down. Power system off.
4. Power Consumption Function Test
4.1 Test mode: 1920x1200 @ 60 Hz
4.2 Test pattern: pattern #41 of “WHITE”
4.3 Adjusting both brightness value to maximum,
4.4 Measure power consumption as the following
Status Power Consumption LED Display
Normal < 130W(with audio) Green
Standby (No H/V
sync) < 2W Orange
Power off < 1W No display
Acer Service Manual
Chapter 4- Disassembly & Assembly
1. Exploded Diagram
9
Acer Service Manual
2 Assembly Block
LP2610
LCD Monitor
MYLAR,L2
22xW150xT
0.5mm
I/F BOARD *1
Power board *1
CABLE 30 PIN *1
speaker*1
HRN ASS'Y 8P
Keypad*1
Keypad cable*1
SCREW,P,CROSS W/WAS,M3*6,Zn *5
SCREW,B,CROSS,W/W(T)M4*6,ZN *1
BOLT,#4-40x11.8,Ni*4
SCREW,PW,CROSS,W/WAS,M3*5,NI*8
SCREW,PW,CROSS,T3*8,Zn,ROHS*2
SCREW,P,CROSS,M4*6,BLACK,NL
ROHS*4
SCREW,P,CROSS W/WAS,M3*6,Zn *9
SCREW,B,CROSS,T.T4*10,BLK,ROHS
*8
SCREW,B,CROSS,M4*5,BLK,ROHS*6
SCREW,P,CROSS,M4*6,BLACK,NL
ROHS*2
stand Ass'y*1
SCREW,P,CROSS,M4*16,BLAC
K,NL ROHS*1
Base Ass’y*1
Back Cover*1
SCREW,B,CROSS,M4*6,
BLK,NL(NYLOK) *4
BRACKET LEFT*2
Front Bezel assm *1
BRACKET,BACK,LP2610,Ro
HS*2
CHASSIS *1
CHASSIS,EMI LP2610*1
PANEL LPL*1
speaker*1,
Panel Sub-Ass'y*1
10
Acer Service Manual
3 Disassembly Block
11
stand Ass'y*1
SCREW,P,CROSS,M4*16,BLACK,
NL ROHS*4
LP2610
LCD Monitor
Back Cover*1
SCREW,B,CROSS,M4*6,BLK,NL(
NYLOK) *4
I/F BOARD *1
Power board *1
CABLE 30 PIN *1
HRN ASS'Y 8P
Keypad*1
Keypad cable*1
SCREW,P,CROSS W/WAS,M3*6,Zn *5
SCREW,B,CROSS,W/W(T)M4*6,ZN *1
BOLT,#4-40x11.8,Ni*4
SCREW,PW,CROSS,W/WAS,M3*5,NI*8
SCREW,PW,CROSS,T3*8,Zn,ROHS*2
SCREW,P,CROSS,M4*6,BLACK,NL
ROHS*4
SCREW,P,CROSS W/WAS,M3*6,Zn *9
SCREW,B,CROSS,T.T4*10,BLK,ROHS*8
SCREW,B,CROSS,M4*5,BLK,ROHS*6
SCREW,P,CROSS,M4*6,BLACK,NL
ROHS*2
PANEL LPL
Panel Ass'y*1
BRACKET LEFT*2
Front Bezel assm *1
BRACKET,BACK,LP2610,R
oHS*2
CHASSIS *1
CHASSIS,EMI LP2610*1
speaker*1,
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Chapter 5- TEST AND ADJUSTMENT
1. GENERAL POINTS
1.1 Test Equipment or Tool
1.1.1 Test pattern generator: PC or video pattern generator (Chroma-2326/2160/2130)
1.1.2 Color analyzer: Chroma-7120
1.1.3 Power meter: AC Source Chroma-6408
1.1.4 Electrical safety tester: Chroma (Zentech) 9032A
1.1.5 Auto shock fixture
1.1.6 Temperature and humidity sensor
1.1.7 DDC interface card and EDID file
1.2 Preset Test Pattern
1.2.1 Crosshatch (General-1)
1.2.2 Gray Bar (16 & 32 levels)
1.2.3 Full White
1.2.4 Aging (Burn-in) Pattern: full Green, Blue, White, Black and Red
1.3 AC input
All measurements mentioned hereafter are carried out at a normal mains voltage (90 - 264 VAC for the
model with full range power supply, unless otherwise stated)
1.4 Observation Distance
1.4.1 Observation distance from eyes to panel is defined as 50cm
1.4.2 Visual distance from instrument to panel is defined as 20cm
1.5 Key Function Description
1.5.1 Control buttons on the front bezel
CONTROL
KEY KEYS FUNCTION
[AUTO] A. When OSD un-displays, press [AUTO] to perform auto-adjustment
B. When OSD displays, press [AUTO] to return to previous level menu
[MENU]
A. When OSD isn’t shown on screen, press [MENU] to enter OSD interface
B. When OSD displays, press [MENU] to perform function of menu icon that is
highlight or enter next level menu
[►], [◄]
A. When “MENU OSD” displays, press these keys to change the contents of an
adjustment item, or change an adjustment value
B. When “MENU OSD” un-displays, press these keys no function
[POWER] Power on or power off the monitor
1.5.2 Hot Key Operation
HOT KEY OPERATION
FUNCTION
AUTO ◄►MENU POWE
R
DESCRIPTION
FACTORY
MODE ●●ON
Press [AUTO] & [MENU] at the same
time, and then press [POWER] for DC
power on. OSD menu will be shown
with “F” on the left top. Select “F” for
entering factory mode.
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ISP MODE ●●ON
Firstly enter the factory mode, then
Press ◄& ►at the same time, and
then press [POWER] for DC power on.
1.6 Burn-in (Aging) Pattern
1.6.1 Burn-in patterns are: full Green, Blue, White, Black and Red
1.6.2 It will enter burn-in mode (aging mode) on condition that Power on and in the factory mode Without
VGA ,
1.6.3 Exit burn-in mode by plug in the VGA cable, then power on.
1.7 Warm Up
All test units have to be done warm up after at least 2 hours in a room with temperature of 40±5°C.
(Except particular requirement)
2. INPUT SIGNAL
2.1 Video Signal Input
2.1.1 a. VESA Analog
The video input consists of red, green, and blue signals. The video signals are analog levels, where
0V corresponds to black and 700mV is the maximum signal amplitude. Input impedance of video
pins is 75 ohm ±1%.
Sync signal input
The capability of sync signal inputs shall include separate sync. Input impedance: 10K ohms the
signals are defined as follow:
Separate sync TTL level, Positive/Negative
Composite sync
Sync on Green
b. Digital signal (Option)
Standard DVI
2.1.2 Input signal mode
PRESET TEST MODE TIMING
Mode Resolution (active
dot)
Resolution
(total dot)
Horizontal
Frequency
(KHz)
Vertical
Frequency
(Hz)
Nominal
Pixel Clock
(MHz)
640x480@60Hz 800 x 525 31.469 59.941 25.175
640x480@72Hz 832 x 520 37.861 72.809 31.500
VGA
640x480@75Hz 840 x 500 37.500 75.000 31.500
VESA 720x400@70Hz 900x449 31.469 70.087 28.322
800x600@56Hz 1024 x 625 35.156 56.250 36.000
800x600@60Hz 1056 x 628 37.879 60.317 40.000
800x600@72Hz 1040 x 666 48.077 72.188 50.000
SVGA
800x600@75Hz 1056x625 46.875 75.000 49.500
XGA 1024x768@70Hz 1328x806 56.476 70.069 75.000
MAC 1152x870@75Hz 1568x909 68.700 75.000 84.520
1152x864@75Hz 1600x900 67.5 75 108
VESA 1280x960@60Hz 1800x1000 60 60 108
1280x1024@60Hz 1688x1066 63.981 60.020 108.000
SXGA 1280x1024@75Hz 1688x1066 79.976 75.025 135.000
1280x720@60Hz 1650x750 44.955 59.940 74.176
1280x768@60Hz 1664x798 47.776 59.870 79.500
VESA
1280x768@75Hz 1696x805 60.289 74.893 102.250
Acer Service Manual
WXGA 1360x768@60Hz 1792x795 47.712 60.015 85.500
1440x900@60 1904x931 55.935 59.887 106.500
WXGA+ 1440x900@75 1936x942 70.635 75.000 136.750
UXGA 1600X1200@60Hz 2160x1250 75.000 60.000 162.000
WSXGA+ 1680x1050@60Hz 2240*1089 65.290 59.954 146.250
WUXGA 1920x1200@60Hz/R 2080x1235 74.083 60.000 154.000
2.1.3 Signal cable
a. 15 pin D-sub VGA cable male
b. Single link 18+1 pin DVI-D male (Option)
2.1.4 Interface
Analog signal: The input signals are applied to display through D-sub or DVI cable.
Length: 1.8 m +/- 50 mm (fixed)
Connector type: a. D-sub male,
b. Single link DVI-D connector male (Option).
With DDC_2B pin assignments.
D-Sub Pin Assignment:
PIN No. SIGNAL PIN No. SIGNAL
1 Red video input 9 VGA +5V
GND2 Green video input 10
3 Blue video input 11 GND
4 GND 12 Serial data line (SDA)
5 Cable detect 13 H. Sync / H+V
6 Red video GND 14 V. Sync
7 Green video GND 15 Data clock line (SCL)
8 Blue video GND
DVI-D Pin Assignment:
Digital-Only Connector Pin Assignments
Pin Signal Assignment Pin Signal Assignment Pin Signal Assignment
1 T.M.D.S. Data2- 9 T.M.D.S. Data1- 17 T.M.D.S. Data0-
2 T.M.D.S. Data2+ 10 T.M.D.S. Data1+ 18 T.M.D.S. Data0+
3 T.M.D.S. Data2/4
Shield 11 T.M.D.S. Data1/3
Shield 19 T.M.D.S. Data0/5
Shield
4 No Connect 12 No Connect 20 No Connect
5 No Connect 13 No Connect 21 No Connect
T.M.D.S. Clock
Shield
6 DDC Clock 14 +5V Power 22
7 DDC Data 15 Ground (for +5V) 23 T.M.D.S. Clock+
8 No Connect 16 Hot Plug Detect 24 T.M.D.S. Clock-
14
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15
3. FUNCTION CHECK
3.1 OSD Function Test
3.1.1 Test mode: 1920x1200 @ 60 Hz
3.1.2 Test pattern: pattern #1 of crosshatch (GENERAL-1)
3.1.3 Check single key function and hot key function about key “Power”, “Menu”,” ►”, “◄“,
“Exit/Auto”, it should operate normally
3.2 Screen Picture Check
3.2.1 Test mode: 1920x1200 @ 60 Hz
3.2.2 Test pattern: pattern #1 of crosshatch (GENERAL-1)
3.2.3 Select OSD menu to execute ‘Auto’ function, screen picture shouldn’t appear abnormal
phenomenon and picture on screen should fit in with active display screen.
3.3 Auto Color Balance
3.3.1 Test mode: 1920x1200 @ 60 Hz
3.3.2 Test pattern: pattern #48 of 32 gray levels (32 GRAYS)
3.3.3 Enter "Factory Mode" pressing "Auto color" key, and execute "AUTO".
3.4 Timing Check
3.4.1 Test mode: Refer to preset timing table and power saving mode
3.4.2 Test pattern: pattern #1 of crosshatch (GENERAL-1)
3.4.3 After change above timing and execute “Auto” function automatically, picture should fit in with
active display screen.
3.4.4 Under power saving mode, LED lamp on the key board should be orange
3.5 Power Consumption Function Test
3.5.1 Test mode: 1920x1200 @ 60 Hz
3.5.2 Test pattern: pattern #41 of “WHITE”
3.5.3 Adjusting both brightness value to maximum,
3.5.4 Measure power consumption as the following
Status Power Consumption LED Display
Normal ≤130W Green
Standby (No H/V
sync) < 2W Orange
Power off < 1W No display
3.6 VGA Cable Detect Test
If VGA cable of LCD monitor isn’t connected to video pattern generator or PC, “NO SIGNAL” should
be shown on screen.
3.7 Hi-Pot test
Test condition:
a. high voltage 2.3KV(DC)
b. leakage current 10mA
c. rising time 1 sec.
d. test time 3 sec.
3.8 Grounding Test
Test condition:
a. test current 30A / 2 sec
b. impedance < 0.1Ω
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3.9 Bumping Test
3.9.1 Test mode: 1920x1200 @ 60 Hz;
3.9.2 Test pattern: pattern #1 of crosshatch (GENERAL-1)
3.9.3 To shock LCD monitor lightly at the center of rear cover and edges with 1~2kg/cm2 force for
three times, no abnormal phenomenon is found on panel screen.
4. DISPLAY CHECK
4.1 Panel Flicker Check
Connect LCD monitor to PC, set LCD monitor to be timing of 1680x1050 @ 60 Hz, adjust brightness to
be default value (brightness at maximum), execute “Auto” function, and then check picture of shut
down under windows XP operating system, or flicker-pattern of pixel on-off. It should be that no flicker
be found on panel screen.
4.2 Panel Defect Inspection
This item should follow IIS
4.2.1 Test mode: 1920x1200 @ 60 Hz
4.2.2 Test pattern: Crosshatch/Full white/Red/Green/Blue/Black/16 color bar/64 gray bars
4.2.3 Display quality must be (according to DIN 13406-2 pixel fault class II)
Defect Type Specification Major Minor
Bright dot defect ≤3pcs ․
Dark dot defect ≤4pcs ․
Total bright and dark dots ≤5pcs ․
Bright Dots – 2 Adjacent B N ≤1 pair ․
Bright Dots – 3 or more Adjacent N ≤0 pair ․
Black Dots – 2 Adjacent B N ≤1 pair ․
Black Dots – 3 or more Adjacent N ≤0 pair ․
Distance between defect dots L ≥15 mm ․
Distance between Dark dots L ≥15 mm ․
Note 1: Dot defect is defined as the defective area is not larger than 50% of the dot area. Bright Dot is
defined 5% transmission ND filter.
Note 2: Light Leakage: There shall not be visible light around the customer’s bezel after assembly in
normal View angle.
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5. PICTURE CHECK
5.1 Check brightness uniformity
5.1.1 Test mode: 1920x1200 @ 60 Hz
5.1.2 Test pattern: pattern #41 of “WHITE”
5.1.3 Test tool: Color Analyzer Chroma7120
5.1.4 Set brightness and contrast to be maximum, apply pattern as Fig.3, it should be the following
requirement:
%≥75
)(backlightpointsnineofluminanceMax.
)(backlightpointsnineofluminanceMin.
Defect Type Count (N) Majo
r
MinorSpecification Size
Black spots which appear when B/L
operating
0.15mm ≤D ≤0. 5 mm
Dot Shape(Particle、Scratch and
Bubbles in Display area or on The
Polarizer)
N ≤3
●
L ≤0.5mm and W ≤0.05 mm Ignored
0.5mm < L ≤5mm and
0.05mm < W ≤0.1mm N ≤4
Line Shape
(Particles、Scratch、Fiber and
Bubbles in display area or on The
Polarizer)
L > 5mm or W > 0.1mm N = 0
●
Display non-uniformity There should be non-uniformity through 5%
transparency of filter or judge by limit sample if
necessary.
●
●Scratch No harm
●Dirt
Wrap No harm ●
Bezel
Sunken No harm ●
●No label
●Invert label No
●Broken
Word can be read. ●Dirt
Not clear ●
Label
●Word out of shape
Mistake No ●
●Position Be attached on right position
●Not enough No
Screw
Limp No ●
●Connector Connection status No bend on pins and damage
FPC/FFC Broken No ●
Acer Service Manual
5.2 Color Temperature Check
5.2.1 Test mode: 1920x1200@ 60 Hz
5.2.2 Test pattern: pattern #41 of “WHITE”
5.2.3 Test tool: Color Analyzer Chroma7120
5.2.4 Set brightness to be maximum and contrast to be 50%, measure color coordinate and luminance by
color analyzer as the following:
Chromaticity Coordinate
Mode
x y Y
9300K 0.283 ± 0.030 0.298 ± 0.030 180
USER Default Default 240
6500K 0.313 ± 0.030 0.329 ± 0.030 240
5.3 Brightness Out (Video signal input 700mV ± 2%)
5.3.1 Test mode: 1920x1200 @ 60 Hz
5.3.2 Test pattern: pattern #41 of “WHITE”
5.3.3 Test tool: Color Analyzer Chroma7120
Set brightness and contrast to be maximum with white pattern, to measure the screen center, the
light output shall be BL >= 400cd/m2
18
Acer Service Manual
Chapter 6- TROUBLE SHOOTING
1. No Power & LED Off
Check primary
rectifier voltage Check circuit
if shor
t
Check IC805､
T803
､
Q
805
Check F801､P801､
D801､RT801
Check pin1 of
IC805 voltage if
under 7.2V
Check R859､
R860､IC805､
C837
Check Pin6 of
IC805 voltage
12V
Check D815､T803､
C843､C844､L805､
F803
Yes
No
No
Yes
Yes
Yes
Yes
NoNo
No
END
Check loading
circuit is short
No power &
LED off
Yes
19
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