Acer AL1917X User manual

Acer Service Manual
0
Service Manual
LCD Monitor Acer
AL1917x

1
1
Service Manual Versions and Revision
No. Version Release Date Revision
1 1.0 2005/08/20 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 AL1917 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. BLOCK DIAGRAM .............................................................................................................................. 錯誤! 尚未定義書籤。
2. INTERFACE BOARD DIAGRAM ........................................................................................................................................... 5
3. ELECTRONIC CIRCUIT THEORY ............................................................................................................................................... 6
4. INVERTER CIRCUIT ............................................................................................................................. 錯誤! 尚未定義書籤。
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........................................................................................................................................................... 14
4. DISPLAY CHECK............................................................................................................................................................... 15
5. PICTURE CHECK............................................................................................................................................................... 16
6. AUDIO CHECK................................................................................................................................................................... 18
CHAPTER 6- TROUBLE SHOOTING.............................................................................................................................................. 19
1. NO POWER & LED OFF .............................................................................................................. 19 錯誤! 尚未定義書籤。
2. UNSTABLE POWER ................................................................................................................................................................ 20
3. NO RASTER ........................................................................................................................................................................... 21
4. BLACK SCREEN ..................................................................................................................................................................... 22
5. BAD SCREEN......................................................................................................................................................................... 23
6. WHITE SCREEN ..................................................................................................................................................................... 24
ATTACHMENT 1- BILL OF MATERIAL......................................................................................................................................... 25
ATTACHMENT 2- SCHEMATIC....................................................................................................................................................... 34
ATTACHMENT 3- PCB LAYOUT ..................................................................................................................................................... 44

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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. 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).
2. Interface BOARD DIAGRAM
MCU
SCL
SDA
DDC
Interface Board
Red
Green
Blue
Vsync
Hsync
A/D
&
Scaling
&
OSD
To
LCD
module
EEPROM
Inverter/Power/Audio BD
(Including AC/DC Power
Supply , Inverter and
Audio)
Interface Board (VGA input)
Keypad BD
Flat panel (LVDS interface) and CCFL
AC input
Range 100V~240V
Host computer
(VGA signal input and DDC)

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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. R820 and R821 joined between two inputting main circuit to prevent
man from shock. L801 is used to clear up low frequency wave. C801 and C806 are used to discharge
the waves that L801 produced. High frequency waves are damped by C801 and C806. D801 is a
rectifier which composed of 4 build-in diodes, it inverts AC to DC.
3.1.2 High Voltage to Low Voltage Control Circuit
C805 is used to smooth the wave from rectifier. IC802 is a highly integrated PWM controller
which build-in power MOSFET. When rectified DC high voltage is applied to the DRAIN pin during
start-up, the MOSFET is initially off, and the CONTROL pin capacitor is charged through a switched
high voltage current source connected internally between the DRAIN and CONTROL pins. When the
CONTROL pin voltage Vc reaches approximately 5.8V, the control circuitry is activated and the
soft-start begins. The soft-start circuit gradually increases the duty cycle of the MOSFET from zero to
the maximum value over approximately 10ms. If no external feedback/supply current is fed into the
CONTROL pin by the end of the soft-start, the high voltage current source is turned off and the
CONTROL pin will start discharging in response to the supply current drawn by the control circuitry.
Resistor R803, R807, R824 and R825 are for line over voltage shutdown(OV) and line
under-voltage detection(UV).
Resistors R801, R805, R822, R823 are for external current limit adjustment. And used to reduce
the current limit externally to a value close to the operating peak current of primary about 1.35A. The
mean is power will protected when the primary current over about 1.35A.
When PWM is turned off, the main current flow will be consumed through D804, and ZD802,
This will prevent MOSFET which built-in IC802 from being damaged under large current impulse and
voltage spike.
D806 and C815 to provide internal Auxiliary current to CONTROL pin during normal operation.
Otherwise, error amplifier and feedback current input the CONTROL pin for duty cycle control.
3.1.3 DC_5V and DC_14V Output Circuit
For DC 5V, D805 is used to rectify the inducted current. R806 and C811 are used to store energy
when current is reversed. The parts including C814, C814, C822, C821, B801 and L803 are used to
smooth the current waves.
For DC 14V, D803 is used to rectify the inducted current. R802 and C802 are used to store
energy when current is reversed. The parts including C808, C810 and L802 are used to smooth the
current waves.
3.1.4 Feedback and OVP Protect Circuit
Pin R of IC803 is supplied 2.5-v stable voltage. It connects to 5V and 14V output through R811,
R810 and R818. R811, R810 and R818 are output sampling resistor. When the sampling voltage more
than 2.5V or less than 2.5V, current of FB IC802 will change, this can change the voltage from T801.
For 5VDC output OVP, ZD803 is a Zener Diode, when 5 voltage up to 5.6V, the zener current
cause R819 voltage to ground is up to 0.7V, Q801 being triggered and OVP working. For 14VDC
output OVP, ZD804 is a Zener Diode, when 14 voltage up to 18V, the Zener current cause R819
voltage to groung is up to 0.7V, Q801 being triggered and OVP working. The current of potential is
used to make build-in diode light. Current of FB to IC802 will be changed, this can change the voltage
from T801.
Q802, R827, R828 and ZD801 make up of dummy loading circuit. For start-up sequence, during
5V output take place high loading first, this dummy loading circuit operated to insure 14V not be
increased.
3.2 I/F Board Circuit
3.2.1 RGB CAPTURE
- Signal RED,GREEN,BLUE input through CN102 #1,#2,#3, Stop DC via C117, C119 and C121,
and then enter into U104 (RTD2023L) analog input terminal #7,#9,#12, and then RTD2023 deals

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with signal internally. TVS101, TVS102, TVS103 are ESD protector to prevent U104 from ESD.
- Signal DDC_SCL (series clock) inputs via CN102#15, and then passes through ZD102 Zener for
ESD protection, goes into EDID EEPROM IC U103 #6.
- Signal DDC_SDA (series data) inputs via CN102#12, and then passes through ZD105 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 R124, and then goes into IC U104 (RTD2023L) #4.
- Signal TTL horizontal sync. (Hsync) inputs via CN102 #13, and then clamped byZD104 Zener,
passes through R125,R126, and then goes into IC U104 (RTD2023L) #5.
- CN102#5 is defined as cable detect pin, this detector realize passes through R152 Pull hight, go
into U105#9.
- U103 +5V is supplied by PC via CN102#9, or supplied by Monitor self via D101.
- U103 is an EEPROM IC which is memory and EDID data saved in it.
3.2.2 Buttons Control
- Button “Power” on right side bezel connects to U105 (MTV512) #48 through R177, via
CN104#4.
- Button “UP” “DOWN ““MENU” “AUTO” on right side bezel connects to U105 (MTV512)
#11,#12,#47,#46 through R175,R173,R172,R176,via CN104 #6, #7, #8, #5.
- U106 is an EEPROM IC which memory factory setting and save the value adjusted by user.
- SCL on U106 #6 and SDA on U106 #5 flow into U105 (MTV512) #37, #38.
- LED Indicator on Front Bezel
a.When press button “power”, U105 (MTV512) #1 sends out high potential, via R174, flow to
CN104 #2 on keypad, LED Blue ON.
b. When in “Suspend” mode, U105 (MTV512) #2 sends out a high potential, via R178, flows to
CN104 #1 on keypad, LED Amber ON.
3.2.3 Realtek CHIP U104 (RTD2023L)
- U104 (RTD2023L) #21~#30 output 8 bit even LVDS digital data to panel control circuit through
CN103.
- U104 (RTD2023L) #31~#40 output 8 bit odd LVDS digital data to panel control circuit through
CN103.
- U104 (RTD2023L) #15 outputs Brightness “PWM” signals to control CCFL brightness.
Please refer to RTD2023L Pin Assignments table in page
3.2.4 Myson chip U105(MTV512)
- U105 (MTV512) #39 output PPWR ”H” potential to make Q103 conducted, and then make Q101
conducted, +5V flow to CN103#1~#3 as Panel VDD .
- U105 (MTV512) #40 output CCFL_ON/OFF ”H” potential to control Inverter on/off.
- TCLK by Crystal 24MHz input to U105 (MTV512) #15,#16.
3.2.4 Regulator Circuit
- +5V is from switching mode power supply for Panel used.
- +3.3V generates from +5V through C101 and C103 filtering and U101 which is output +3.3V
LDO for U103, U104 and U105 used.
- +1.8V generates from +5V through C101 and C103 filtering and U102 which is output +1.8V
LDO, for U104 used.
3.2.5 Audio circuit
- Audio Signal R,L,GND input through P701,#2,#5,#1, Stop DC via C711, C712, and then enter
into U701 (TDA7496L) analog input terminal #4,#9.
- U701 (TDA7496L) #14,#17 output R,L audio data to Speaker through CN701.
- U105 (MTV512) #14 output MUTE “H” potential to control U701on/off.
- U105 (MTV) #45 outputs Volume “PWM” signals to control U701 Volume.

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4. Inverter circuit
4.1 Low voltage to high voltage circuit
14VDC provides the power for IC501 through F501; 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, R526, D515, R529, C505 make up a
network of delaying time circuit and R523, R524 make up a divided voltage network, C504 is used to
dump noise. The operation frequency is determined by the external Resistor R522 and capacitor C529
connected to pin5 of IC501. BURST MODE dimming pulse frequency and duty is regulated by I/F
board. C503 is used for soft start and compensation, C502, C528 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, and each of U501, U502 is consist of a N channel
MOSFET and a P channel MOSFET. U501 and U502 work as full-bridge topology, it is high efficient,
zero voltage switching.
During start up, VSEN (pin9) 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 R509, R511. The
feedback voltage through R506, R507, C508 connected to Pin11 (ISEN), then compared with a
reference voltage (1.5V) via a current amplifier, resulting in PWM drive outputs to full-bridge switches.
4.2 Protection circuit
Over Voltage Protection: R501and R502 are connected in high voltage output connector, the
divided AC voltage is inverted DC voltage through D508, R505 and C507are 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 resistors R510, R511, R512, R509 are sensed a
high level AC voltage, the AC signal OP1 invert DC voltage through D509, R515, C533, and the high
level DC voltage reaches the gate pin of Q502, similarly, the gate pin of Q503, Q504, Q505 has high
level DC voltage. So the gate pin of Q501 has a low level voltage, and the IC501 is normal operation.
Once one of signal OP1, OP2, OP3, and OP4 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
Note:
The DIS assembly direction please following direction of arrowhead
ASSY, BASE
BASE*1
RUBBER FOOT *4
GASKET*1
PLATE,BASE*1
T4*6,Zn, ROHS *2
BACK COVER
SCREW T4*8, Zn ROHS *2
SPEAKER*1
ASSY STAND
M4*6,Black Zn,NL ROHS *6
BRACKET FINGER *1
HINGE *1
STAND
M4*18,Zn ROHS *3
ASSY FRONT BEZEL
LE 1918
LCD Monitor
ASSY PANEL UNIT
M3*4,Zn ROHS *4
CABLE 30P FFC
BOLT,#4-40x11.8,Ni ROHS
*2
PANEL INNOLUX
MT190EN02_V0
CHASSIS *1
PCBA I/F BOARD *1
PCBA INV.&DC-DC *1
HRN ASS'Y 8P
M3*6,Zn ROHS *7
GASKET*1
FRONT BEZEL *1
FUNCTION KEY *1
POWER BUTTON *1
LED LENS
HINGE COVER*1

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3. Assembly Block
PCBA INV.&DC-DC *1
M3*6,Zn ROHS *4
PCBA I/F BOARD *1
CABLE 30 PIN FFC
M3*6,Zn ROHS *1
BOLT,#4-40x11.8,Ni ROHS
*2
GASKET*1
PANEL INNOLUX
MT190EN02_V0
ASSY STAND*1
M4*6,Black Zn,NL ROHS *6
BACK COVER*1
SPEAKER*1
SCREW T4*8, Zn ROHS *2
TAPE ACE *2
ASSY PANEL*1
M3*4,Zn ROHS *4
ASSY BEZEL*1
LE 1918
LCD Monitor
BEZEL*1
BUTTON,POWER KEY*1
BUTTON,FUNCTION*1
LENS*1
CHASSIS *1
KEY PAD*1
HRN ASS'Y 8P
M3*6,Zn ROHS *2
STAND*1
HINGE*1
BRACKET FINGER*1
M4*18,Zn ROHS *3
ASSY BASE*1
BASE*1
RUBBER*4
GASKET*1
PLATE,BASE*1
T4*6,Zn, ROHS *2
HINGE COVER*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 Stereo source: Music or signal generator input
1.1.6 Auto shock fixture
1.1.7 Temperature and humidity sensor
1.1.8 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 Red, Green, Blue, White, and Black
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 [►],adjust volume high;
press [◄]adjust volume low
[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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1.6 Burn-in (Aging) Pattern
1.6.1 Burn-in patterns are: full Red, Green, Blue, White and Black
1.6.2 Stop burn-in pattern by providing with video signal from D-sub connector
1.6.3 Enter or exit burn-in mode by setting “burn-in” to be “on” or “off” in the factory mode
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 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: 2k2 ohms the
signals are defined as follow:
Separate sync TTL level, Positive/Negative
2.1.2 Input signal mode
PRESET TEST MODE TIMING
Resolution H-Freq. (kHz) V-Freq. (Hz) Dot Clock (MHz) Mode
31.5 60.0 25.175
37.9 72.0 31.500
640 x 480
37.5 75.0 31.500
35.1 56.0 36.000
37.9 60.0 40.000
48.1 72.0 50.000
800 x 600
46.9 75.0 49.500
48.4 60.0 65.000
56.5 70.0 75.000
1024 x 768
60.0 75.0 78.750
64.0 60.0 108.000
1280 x 1024 80.0 75.0 135.000
VESA
IBM-AT
Compatible
machine
PC-9800 series
640 x 350 31.5 70.0 25.175
720 x 400 31.5 70.0 28.322 US/IBM Text
832 x 624 49.7 74.6 57.283
60.2 75.0 80.000
1024 x 768 48.8 60.0 64.000
Power Macintosh
series
2.1.3 VGA signal cable
15 pin D-sub VGA connector of signal cable.
2.1.4 Interface
Analog signal: The input signals are applied to display through D-sub cable.
Length: 1.8 m +/- 50 mm (fixed)
Connector type: D-sub male.
With DDC_2B pin assignments.

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Blue connector thumb-operated jack screws
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
3. FUNCTION CHECK
3.1 OSD Function Test
3.1.1 Test mode: 1280x1024 @ 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: 1280x1024 @ 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: 640x480 @ 60 Hz
3.3.2 Test pattern: pattern #42 of 5-MOSAIC
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: 1280x1024 @ 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 < 42W(with audio) 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: 1280x1024 @ 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 1280x1024@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
4.2.1 Test mode: 1280 x 1024@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 THD ˙
Dark dot defect THD ˙
Total bright and dark dots THD ˙
Bright Dots – 2 Adjacent B THD ˙
Bright Dots – 3 or more
Adjacent
THD ˙
Black Dots – 2 Adjacent B THD ˙
Black Dots – 3 or more Adjacent THD ˙
Distance between defect dots THD ˙
Distance between Dark dots THD ˙
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: 1280x1024 @ 60 Hz
5.1.2 Test pattern: pattern #41 of “WHITE”
5.1.3 Test tool: Color Analyzer Chroma7120
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 ●

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5.1.4 Set brightness and contrast to be maximum, apply pattern as Fig.3, it should be the following
requirement:
%≥75
)(backlightpointsnineofluminanceMax.
)(backlightpointsnineofluminanceMin.
Fig. 3
5.2 Color Temperature Check
5.2.1 Test mode: 1280x1024 @ 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
9300K 0.283 ± 0.030 0.298 ± 0.030
USER / /
6500K 0.313 ± 0.030 0.329 ± 0.030
5.3 Brightness Out (Video signal input 700mV ± 2%)
5.3.1 Test mode: 1280x1024 @ 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 cd/m2
Mode BL (cd/cm2) Remark
HSD190WE13-A02 220
LM190E03-TLB1 260
LM190E03-TLB4 260
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".
123
45
L/2 L/4
W/4
W/2
6
789

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18
5.4.4 EDID data: (For example)
For Hannstar HSD190ME13 Panel
00 FF FF FF FF FF FF 00 04 72 63 AD 00 00 00 00
01 0F 01 03 08 26 1E 78 E8 FD 56 A5 53 4A 9D 24
14 4F 54 BF EF 00 01 01 01 01 01 01 01 01 01 01
01 01 01 01 01 01 30 2A 00 98 51 00 2A 40 30 70
13 00 78 2D 11 00 00 1E 00 00 00 FD 00 38 4B 1E
53 0E 00 0A 20 20 20 20 20 20 00 00 00 FF 00 30
30 30 30 30 30 30 30 30 30 30 30 0A 00 00 00 FC
00 41 4C 31 39 31 37 0A 20 20 20 20 20 20 00 39
For LPL LM190E03-TLB1/TLB4 Panel
00 FF FF FF FF FF FF 00 04 72 63 AD 00 00 00 00
01 0F 01 03 08 26 1E 78 E8 A2 A5 A3 57 4C 9D 25
11 50 54 BF EF 00 01 01 01 01 01 01 01 01 01 01
01 01 01 01 01 01 30 2A 00 98 51 00 2A 40 30 70
13 00 78 2D 11 00 00 1E 00 00 00 FD 00 38 4B 1E
53 0E 00 0A 20 20 20 20 20 20 00 00 00 FF 00 30
30 30 30 30 30 30 30 30 30 30 30 0A 00 00 00 FC
00 41 4C 31 39 31 37 0A 20 20 20 20 20 20 00 39
6. AUDIO CHECK
6.1 Audio Sound Check
6.1.1.1. Apply audio source of test program, (1)voice ”LEFT” and “RIGHT” ;(2)500mVrms sine wave
that sweep from 200Hz to 20 KHz, into audio input (light blue), it should be that L speaker sounds
while “LEFT” and R speaker sounds while “RIGHT”
6.1.1.2. Set the volume control (on OSD) at max (100%). It should be that no buzz or rattling sound
occurs over the sweep frequency range.
6.2 Audio control test
6.2.1.1 When OSD is not on screen, press key ” ►”or “◄“, volume adjustment bar appears on screen
and value will grow or decrease and sound volume of speakers should be changed.
If the functional test had been passed, adjust volume bar to be at 90% before exit OSD.
After inspection, set the audio control out of OSD.

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Chapter 6- TROUBLE SHOOTING
1. No Power & LED Off
No power
&LED off
Check pin3 of IC802
voltage about 1V
Check primary
rectifier voltage
Check pin1 of IC802
voltage is 5.8V
END
Check circuit if short
Check R812,
R816, C818
Check R803,
R807, R824,
R825
Check R801,
R805, R822,
R823, R817
Check
F801, F802,
P801, D801
Check IC802,
C805, T801
Check pin2 of IC802
voltage about 2V
YES
YES
YES
YES
YES
YES
NO NO
NO
NO
NO