Acer AL2016 User manual

Acer Service Manual
Service Manual
LCD Monitor Acer AL2016
0

1
Service Manual Versions and Revision
No. Version Release Date Revision
1
1.0
2005/08/25
Initial Release
Copyright
Copyright 2005 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 AL2016 Service Manual
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Acer Service Manual
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...................................................................................... ERROR! BOOKMARK NOT DEFINED.
2. ELECTRONIC CIRCUIT THEORY ............................................................................................................................................... 5
3. INVERTER CIRCUIT .................................................................................................................................................................. 7
CHAPTER 4- DISASSEMBLY & ASSEMBLY ................................................................................................................................... 9
1. EXPLODED DIAGRAM ............................................................................................................................................................. 9
2. DISASSEMBLY BLOCK ........................................................................................................................................................... 10
3. ASSEMBLY BLOCK ................................................................................................................................................................ 11
CHAPTER 5- TEST AND ADJUSTMENT ........................................................................................................................................ 12
1. GENERAL POINTS ............................................................................................................................................................. 12
2. INPUT SIGNAL .................................................................................................................................................................. 13
3. FUNCTION CHECK........................................................................................................................................................... 15
4. DISPLAY CHECK............................................................................................................................................................... 16
5. PICTURE CHECK............................................................................................................................................................... 17
CHAPTER 6- TROUBLE SHOOTING.............................................................................................................................................. 20
1. NO POWER & LED OFF ...................................................................................................................................................... 20
2. 18VDC OUTPUT VOLTAGE IS UNSTABLE ................................................................................................................................. 21
3. 5VDC OUTPUT POWER IS UNSTABLE....................................................................................................................................... 22
4. 5VDC OUTPUT POWER IS UNSTABLE....................................................................................................................................... 23
5. AL2016W BACKLIGHT CAN'T BE TURNED ON(INL INVERTER) ................................................................................................. 24
6. TROUBLESHOOTING LIST-TDK INVERTER ............................................................................................................................... 25
ATTACHMENT 1- BILL OF MATERIAL......................................................................................................................................... 26
ATTACHMENT 2- SCHEMATIC....................................................................................................................................................... 32
ATTACHMENT 3- PCB LAYOUT ..................................................................................................................................................... 41
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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:
This 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.
Do 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.
Do not remove the monitor cabinet. There are high-voltage parts inside that may cause electric
shock to human bodies.
Stop using the monitor if the cabinet is damaged. Have it checked by a service technician.
Put your monitor only in a lean, cool, dry environment. If it gets wet, unplug the power cable
immediately and consult your closed dealer.
Always 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.
Do 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
When replacing parts or circuit boards, clamp the lead wires around terminals before soldering.
Keep wires away from high voltage, high temperature components and sharp edges.
Keep wires in their original position so as to reduce interference.
Adjustment 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
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Chapter 3- CIRCUIT THEORY
1. Functional Block Diagram
2. Electronic Circuit Theory
2.1 Switching Mode Power Supply
2.1.1 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 100V to 240V. R801 and R802 joined between two inputting main circuit to prevent man from
shock. L801 is used to clear up low frequency wave. C801 and C802 are used to discharge the waves
that L801 produced. High frequency waves are damped by C801 and C802. D801 is a rectifier which
composed of 4 build-in diodes, it inverts AC to DC.
2.1.2 High Voltage to Low Voltage Control Circuit
C804 is used to smooth the waveform from rectifier. IC802 is a highly integrated PWM controller,
which control the power MOSFET Q804. When rectified DC high voltage is applied to the DRAIN pin
during start-up, the MOSFET is off initially, and the capacitor C807 be charged through D802,R803
and the HV pin of IC802,when the voltage VCC reaches the threshold level 12.8V,IC 802 start up and
create a PWM waveform to control the power MOSFET, then energy is transferred to secondary
terminal through the transformer T801,the auxiliary voltage 12V and the output voltage 18V be
created ,the auxiliary voltage supply a continue current to IC802,the level of out put voltage is
feedback to FB pin of IC802 through R823,R837,R822,IC803 and IC801 witch control the duty of the
PWM waveform, then all the convert circuit go to a stable operating station.
R805 R806 R835 ZD801 ZD806 and Q801 formed a under input voltage protection circuit , only the
input AC voltage over the threshold level approximately 63V AC, the switch Q801 can be on and then
the auxiliary voltage can supply a continue current to IC802;R808,R807,R836,R812,R815,R839,D806
and Q805 formed a over line current protection circuit witch limited the input power under
approximately 63W. ZD802 will be on when the output voltage is too high or the feedback circuit open,
the current will drive transistor Q805 open through R830, D814 and made IC802 off; the high voltage
spike created by transformer’s primary winding during the transistor turn off will be consumed through
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D804 R813 R814 and C806, This will prevent MOSFET from being damaged under large current
impulse and voltage spike.
2.1.3 DC_18V, DC 5V and DC_3.3V Output Circuit
For DC 18V, D807 is used to rectify the inducted current. R816 and C814 are used to store energy
when current is reversed. The parts including C815,C816,C817 and L802 are used to smooth the
Voltage waves.
For DC 5V, a PWM DC to DC circuit is used to get DC 5V from DC 18V. IC804 is the PWM controller.
C826 decide PWM operation frequency. Q802, D808 and D810 made up of buck circuit to get DC 5V.
C825, B801, C824 and C820 are used to smooth the Voltage waves.
For DC 3.3V, a PWM DC to DC circuit is used to get DC 3.3V from DC 18V. IC805 is the PWM
controller. C829 decide PWM operation frequency. Q806, D811 and D812 made up of buck circuit to
get DC 3.3V. C832, B802, C830 and C833 are used to smooth the Voltage waves.
2.1.4 Feedback and OVP Protect Circuit
Pin R of IC803 is supplied 2.5V stable voltage. It is connected to 18V through R823, R837 and R822.
R823 R837 and R822 are output sampling resistor. When the sampling voltage more than 2.5V or less
than 2.5V, feedback current control IC802 to change pulse width. That can stabilize the out put voltage
through transformer T801.
Q803, R828, C834, R827, ZD803, ZD804 and ZD806 made up of over voltage protection circuit.
When DC out put 18V over 20V, the ZD803 zener will breakdown. If DC out put 5V over 5.6V, the
ZD804 will breakdown. If DC out put 3.3V over 3.9V, the ZD805 will breakdown. Any zener of
ZD803, ZD804 and ZD805 breakdown, the Q803 be triggered. Then the PWM controller (IC802) stop
output switch waveform. But the IC802 is a recovery controller. When remove the issue, DC out put
will automatically recover.
2.2 I/F Board Circuit
2.2.1 RGB CAPTURE
- Signal RED,GREEN,BLUE input through CN102 #1,#2,#3, Stop DC via C117, C118 and C119,
and then enter into U105 (MST9251A) analog input terminal #33,#30,#28, and then MST9251A
deals with signal internally. D103,D104,D105 are ESD protector to prevent U105 from ESD.
- Signal DDC_SCL (series clock) inputs via CN102#15, and then passes through ZD105 Zener for
ESD protection, goes into EDID EEPROM IC U103 #6.
- Signal DDC_SDA (series data) inputs via CN102#12, and then passes through ZD104 Zener for
ESD protection, goes into EDID EEPROM IC U103 #5.
- Signal TTL vertical sync. (Vsync) inputs via CN102 #14, and then clamped by ZD103 Zener,
passes through R122, and then goes into IC U105 (MST9251A) #37.
- Signal TTL horizontal sync. (Hsync) inputs via CN102 #13, and then clamped byZD101 Zener,
passes through FB103,R123, and then goes into IC U103 (MST9251) #36.
- CN102#5 is defined as cable detect pin, and then passes through ZD104 Zener and R137 for ESD
Protection. This detector realized passes through R145 Pull hight, go into U107 #31.
- U103 +5V is supplied by PC via CN102#9, or supplied by Monitor self via D102.
- U103 is an EEPROM IC which is memory and EDID data saved in it.
2.2.2 Buttons Control
- Button “Power” on right side bezel connects to U107 (MTV312) #41 through R155, via
CN103#4.
- Button “AUTO” “LEFT” “RIGHT““MENU” on right side bezel connects to U107 (MTV312)
#3,#2,#1,#42 through R149,R150,R153,R154,via CN103 #8, #7, #6, #5.
- U104 is an EEPROM IC which memory factory setting and save the value adjusted by user.
- SCL on U104 #6 and SDA on U106 #5 flow into U107 (MTV312) #13, #14.
- LED Indicator on Front Bezel
a.When press button “power”, U107 (MTV312) #26 sends out low potential, via R151,then
launch Q105, flow to CN103 #3 on keypad, LED Green ON.
b. When in “Suspend” mode, U107 (MTV312) #27 sends out a low potential, via R152, then
launch Q106, flows to CN103 #2 on keypad, LED Amber ON.
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2.2.3 Scaler IC Mstar CHIP U105 (MST9251A)
- U105 (MST9251A) #160, #161, #166~#171 output 8 bit even LVDS digital data to panel control
circuit through CN105 with a separate differential clock via #164, #165.
- U105 (MST9251A)) #174, #175, ##178~#181,#186,#187 output 8 bit odd LVDS digital data to
panel control circuit through CN105, with a separate differential clock via #176, #177.
- U105 (MST9251A) #201 outputs “DIMMER” PWM signals to control CCFL brightness.
- U105 (MST9251A) #106, #107 output a differential clock to DDR , with a parallel resistor R169
is between MCLK+ and MCLK-.
- U105 (MST9251A) #105,#110, #111, #112, #115, #116, #100, #101, #133, #134, #81, #153 send
series of control signal to DDR.
- Nets AR0~AR11 are address select bus from Scaler to DDR.
-Nets MDATA0~MDATA31 are data bus between Scaler and DDR.
Please refer to MST9251A Pin Assignments table in page
2.2.4 MCU Myson chip U107(MTV312)
- U107 (MTV312) #16 output PANEL_ENABLE high potential to make Q103 conducted, and
then make Q102 conducted, +5V flow to CN105#1, #2, #4 as Panel VDD “VLCD” .
- U107 (MTV312) #9 output CCFL_ENABLE low potential to control Inverter on/off.
- TCLK by Crystal 12MHz input to U107 (MTV312) #11, #12.
2.2.5 DDR Sumsung chip K4D263238G-VC36
-U106 is a frame buffer DDR. Control by Scaler via communication bus.
2.2.6 Regulator Circuit
- +5V is from switching mode power supply for U103 and Panel used.
- +3.3V is from switching mode power supply for U104, U105, U107 used.
- +2.5V generates from +5V through C112 filtering D101 Dropping down and U102 which is
output 2.5V LDO for U105 and U106 used.
- +1.8V generates from +3.3V through C108 filtering by U101 which is output 1.8V LDO, for
U105 used.
3. Inverter circuit
3.1 Low voltage to high voltage circuit
18VDC provides the power for IC501 through F501 from power board; the control signals
Brightness and ON/OFF come from I/F board. ON/OFF signal connect to pin8 of IC501 and makes
IC501 enable. Brightness signal connect to pin7 of IC501 and regulates the panel brightness, R509,
D501, R511, C510 make up a network of delaying time circuit for ON/OFF and R501, R508 make up a
divided voltage network for BRIGHTNESS, C515 is used to dump noise. The operation frequency is
determined by the external Resistor R505 and capacitor C512 connected to pin5 of IC501. BURST
MODE dimming pulse frequency and duty is regulated by I/F board. C513 is used for soft start and
compensation, C514, C508 are used for dump noise.
The output drives, include NDR4, NDRV2, PDRV3, PDRV1 (pins1, 3, 15, 16 respectively) output
square pulses to drive MOSFET U501, U502, U503, U504 and each of U501, U502 U503, U504 is
consist of a N channel MOSFET and a P channel MOSFET. U501 and U502, U503 and U504 work as
full-bridge topology work mode, it is high efficient, zero voltage switching.
During start up, VSEN (pin9 of IC501) senses the voltage at the transformer secondary. When
VSEN reaches 3.0V, the output voltage is regulated. If no current is sensed approximately 1.5 seconds
IC501 shunt off.
The current flowing through CCFL is sensed and regulated through sense resistor R504, R507,
R513, R519, R526 and R530. The feedback voltage through D511, D514, D515, D516, D519, D520,
R514 and C522 connected to Pin11 (ISEN) of IC501, then compared with a reference voltage (1.5V)
via a current amplifier, resulting in PWM drive outputs to full-bridge switches.
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3.2 Protection circuit
Over Voltage Protection: C503, C505and C506 are connected in high voltage output connector,
the divided AC voltage is inverted DC voltage through D503, R523and C533 are used to rectify wave
& dump noise. Then the voltage signal reaches Pin9 VSEN of IC501, when the voltage changes,
build-in PWM of IC501 will adjust output voltage.
Open Lamp Protection: In normal operation, the test points of OP1, OP2, OP3, OP4, OP5, OP6
are sensed a high level AC voltage, the AC signal, for example OP1 invert DC voltage through R531,
C540, so the high level DC voltage reaches the gate pin of Q502, So the gate pin of Q501 has a low
level voltage, and the IC501 is normal operation. Once one of signal OP1, OP2, OP3, OP4, OP5 and
OP6 is low, the voltages of Q501 gate pin is high level, and make the voltage of ISEN low level, the
IC501 will be shunt down.
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Chapter 4- Disassembly & Assembly
1. Exploded Diagram
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2. Disassembly Block
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3. Assembly Block
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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
VESA MODES
Horizontal Vertical
Mode Resolution Total Nominal
Frequency
+/-0.5KHz
Sync
Polarity
Nominal
Frequency
+/-1Hz
Sync
Polarity
Nominal
Pixel
Clock
(MHz)
640*480@60Hz 800*525 31.469 N 59.941 N 25.175
640*480@72Hz 832*520 37.861 N 72.809 N 31.500
640*480@75Hz 840*500 37.500 N 75.000 N 31.500
VGA
640*480@85Hz 832*509 43.269 N 85.008 N 36.000
800*600@56Hz 1024*625 35.156 P 56.250 P 36.000
800*600@60Hz 1056*628 37.879 P 60.317 P 40.000
800*600@72Hz 1040*666 48.077 P 72.188 P 50.000
800*600@75Hz 1056*625 46.875 P 75.000 P 49.500
SVGA
800*600@85Hz 1048*631 53.674 P 85.061 P 56.250
1024*768@60Hz 1344*806 48.363 N 60.004 N 65.000
1024*768@70Hz 1328*806 56.476 N 70.069 N 75.000
1024*768@75Hz 1312*800 60.023 P 75.029 P 78.750
XGA
1024*768@85Hz 1376*808 68.677 P 84.997 P 94.500
1152*864@75Hz 1600*900 67.500 P 75.000 P 108.000
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1280*960@60Hz 1800*1000 60.000 P 60.000 P 108.000
1152*720@60Hz 1488*748 44.859 N 59.972 P 66.750
1280*1024@60Hz 1688*1066 63.981 P 60.020 P 108.000
SXGA 1280*1024@75Hz 1688*1066 79.976 P 75.025 P 135.000
UXGA 1600*1200@60Hz 2160*1250 75.000 P 60.000 P 162.000
1680*1050@60Hz 2240*1089 65.290 N 59.954 N 146.250
WSXGA+ 1680*1050@75Hz 2272*1099 82.306 N 74.892 N 187.000
IBM MODES
640*350@70Hz 800*449 31.469 P 70.087 N 25.175
EGA 720x400@70Hz 900*449 31.469 N 70.087 P 28.322
MAC MODES
VGA 640*[email protected] 864*525 35.000 P66.667 P 30.240
SVGA 832*624@75Hz 1152*667 49.725 N 74.550 N 57.283
XGA 1024*768@75Hz 1328*804 60.241 N 74.927 N 80.000
1152*870@75Hz 1456*915 68.681 N 75.062 N 100.00
Other MODES
XGA 1024*768@72Hz 1360*800 57.669 N 72.086 N78.434
SXGA 1280*1024@70Hz 1696*1072 74.882 P 69.853 P 127.000
Note: DVI do not support timing 1680x1050@75Hz if DVI is built.
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
2 Green video input 10 GND
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:
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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
6 DDC Clock 14 +5V Power 22
T.M.D.S. Clock
Shield
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-
3. FUNCTION CHECK
3.1 OSD Function Test
3.1.1 Test mode: 1680x1050 @ 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: 1680x1050 @ 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: 800x600 @ 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: 1680x1050 @ 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 ≤55W Green
Standby (No H/V
sync) < 1W Orange
Power off < 1W No display
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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
3.9 Bumping Test
3.9.1 Test mode: 1680x1050 @ 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 98 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: 1680 x 1050@60Hz
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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Defect Type Specification Size Count (N) Majo
r
Minor
Dot Shape(Particle、Scratch
and Bubbles in Display area
or on The Polarizer)
Black spots which appear
when B/L operating
0.15mm ≤D ≤0. 5 mm
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 ●
Dirt No harm ●
Wrap No harm ●
Bezel
Sunken No harm ●
No label ●
Invert label ●
Broken
No
●
Dirt Word can be read. ●
Not clear ●
Word out of
h
●
Mistake No ●
Label
Position Be attached on right position ●
Not enough No ●
Screw Limp No ●
Connecto Connection
tt
No bend on pins and damage ●
FPC/FFC Broken No ●
5. PICTURE CHECK
5.1 Check brightness uniformity
5.1.1 Test mode: 1680x1050 @ 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.
17

Acer Service Manual
9
7 8
1 2 3
4 5 6
L/2 L/10
W/10
Fig. 3
5.2 Color Temperature Check
5.2.1 Test mode: 1680x1050 @ 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: 1680x1050 @ 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 >= 240cd/m2
5.4 DDC Data Check
5.4.1 EDID program
5.4.2 Execute main program for EDID writing (refer to model type), using scanner for barcode
download.
5.4.3 If writing EEPROM is successful, and then shows text "PASS" on screen; if writing EEPROM is
failure, then shows text "FAIL".
5.4.4 EDID data: (For example)
For QD20AL0101 Panel VGA EDID table:
0 1 2 3 4 5 6 7 8 9 A B C D E F
0 00 FF FF FF FF FF FF 00 04 72 64 AD 00 00 00 00
1 01 0F 01 03 08 2B 1B 78 EA C3 15 A6 56 4A 9B 24
2 16 50 54 BF EF 80 A9 40 01 01 01 01 01 01 01 01
3 01 01 01 01 01 01 08 39 90 30 62 1A 27 40 68 B0
4 36 00 B1 0F 11 00 00 1E 00 00 00 FD 00 38 56 1F
5 54 13 00 0A 20 20 20 20 20 20 00 00 00 FF 00 30
6 30 30 30 30 30 30 30 30 30 30 30 0A 00 00 00 FC
7 00 41 4C 32 30 31 36 57 0A 20 20 20 20 20 00 CS
18

Acer Service Manual
For QD20AL0101 Panel DVI EDID table:
0 1 2 3 4 5 6 7 8 9 A B C D E F
0 00 FF FF FF FF FF FF 00 04 72 64 AD 00 00 00 00
1 01 0F 01 03 80 2B 1B 78 EA C3 15 A6 56 4A 9B 24
2 16 50 54 BF EF 80 A9 40 01 01 01 01 01 01 01 01
3 01 01 01 01 01 01 08 39 90 30 62 1A 27 40 68 B0
4 36 00 B1 0F 11 00 00 1E 00 00 00 FD 00 38 56 1F
5 54 13 00 0A 20 20 20 20 20 20 00 00 00 FF 00 30
6 30 30 30 30 30 30 30 30 30 30 30 0A 00 00 00 FC
7 00 41 4C 32 30 31 36 57 0A 20 20 20 20 20 00 CS
19
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