3.1 No Display, Power Indicator Is Off Or Blinking
3.2 No Display, Power Indicator Is Orange
3.3 No Display, Power Indicator Is Green
4.0 Video Connector Pin Assignment
5.0 Visual Inspection Criteria-LCD Panel
5.1 Criteria (acceptable)
5.2 External inspection
6.0 Spare Parts List
Page 3
7.0 Circuit Diagram
7.1 Power Distribution
7.2 VGA Input
7.3 ADC
7.4 Damping Network
7.5 Frame Rate Conversion
7.6 ASI 321
7.7 ASI 321 Power & EXT. OSD
7.8 Micro controller
7.9 Panel Interface
8.0 Layout Diagram
(To be confirmed)
9.0 Parts List
Page 4
Audience
This service manual is primarily for system engineers, service engineers, dealers and
distributors. It carries the assumption that reader understands the basic operating concepts.
Purpose
This manual contains reference data for LP-10T21 LCD monitor. It gives information
regarding the operating principles of monitors, as well as technical service and maintenance
information.
1.0 Introduction
About This Manual
The LP-10T is a high performance 10.4” TFT LCD monitor. This micro-controlled monitor is
designed for continuous operation from 31.5 to 48 KHz and is capable of displaying up to a
resolution of 800 *600 in interface mode. The razor sharp flicker-free image, and the
delicate ergonomic design of this monitor elevate not only productivity but also the user’s
comfort.
1.1 Operation Specification
1.1.1 Operation Environment
Temperature
Operation:0 to 40℃
Storage:-20 to 60℃
Humidity (Relative)
Operation:10 to 80% non-condensing
Storage:10 to 90% non-condensing
Altitude
Operation:0~8000ft
Storage:0~40000ft
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1.1.2 Safety, Ergonomic, EMC Compliance
This monitor complies with the following safety, ergonomic, and EMC standard
UL:UL1950, Third Edition
FCC:FCC Rules and CISPR22 (Docket NO. 92-152, SEP. 1993) and FCC/
ANSIC63.K-1992
TUV-GS:EN60950→ 1992+A1+A2+A3+A4+A11 and EK1-ITB2000
CUL:CAN / CSA C22.2 NO.950
CE(EMC):EN55022/1998 and EN61000-3-2 / 1995 +A12/1996 +A13 / 1997
+A1/1998 +A2/1998 and EN61000-3-3/1995 and EN5502K / 1998
CE(LVD):EN60950→ 1992+A1+A2+A3+A4+A11
1.1.3 Signal Input Requirement
Connector:
15 pin D-Sub high-density connector for video and sync signals. See chapter 4 for
pin assignment.
Video Signals:
Type: Red, Green, Blue channels analog input.
Level: 0.7Vp-p
Impedance:75 ohms.
Sync Signals:
Type: Separate Horizontal and Vertical Sync
Level: TTL Level
Polarity: Positive or negative
1.1.4 Power Input Requirement
Operating voltage range
100~240 V AC at 50/60 Hz
Power Consumption
Normal Operation: 19W
Stand by: 2.5W
Suspend mode: 2.5W
Off mode: 2.5W
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1.2 Functional Specification
The standard conditions for verifying the following specification are:
Temperature: 25±5℃
Warm-Up Time: 15 minutes minimum
AC line input: 100~240 V AC±10%, 50 / 60±3Hz
View Distance: 30cm
1.2.1 Display Quality
Display Size (H*Z): 211.2mm*158.4mm
Brightness: more than 120 cd/ m
2
Contrast Ratio: 180:1
1.2.2 Color Quality
White Balance (Use full white pattern, set brightness to maximum)
At color temperature of white light CIE9300
o
K+27M..P.C.D
X=0.283±0.02, Y=0.298±0.02
At color temperature of white light CIE6500
X=0.313±0.02, Y=0.329±0.02
1.3 Control And Adjustment
1.3.1 External User Controls
POWER Power On / Off MENU OSD Menu On / Off UP Increase the Value. DOWN Decrease the Value. ENTER Confirm the selection
1.3.2 Controlled Functions From OSD Menu
Brightness: Press (+) key to increase brightness, (-) key to decrease brightness.
Contrast: Press (+) key to increase contrast, (-) key to decrease contrast.
o
K+27M..P.C.D
Auto Adjust: Press (+) or (-) to adjust H-phase & H-position & V-position clock
automatically.
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Phase: By varying this (+)(-) control the exact sampling time within the pixel can
be adjusted.
Clock: Adjust sampling clock of analog to digital converter until clock is equal to
pixel frequency of video input.
H-Position: Press (+) key to shift screen right, (-) key to shift screen left.
V-Position: Press (+) key to shift picture upward, (-) key to shift picture downward.
Sharpness: Press (+) key to increase sharpness, (-) key to decrease Sharpness.
Color Temp: Press (+) or (-) to choose three types of color temperature 9300,
6500 and user define.
Language: Press (+) or (-) to choose any one of the following languages: English,
French, German, Italian and Spanish.
OSD: Adjust OSD frame location, timeout, transparency and preset OSD.
Dos-text / graphic: Select display quality (text / graphic) when this monitor is used
in DOS.
Recall: Recall the default value.
1.3.3 Special Functions
Automatic storing: After adjusting the screen parameters, the microprocessor
automatically stores the screen settings in user mode.
Entering factory mode: Press (+) and (-) at same moment before power on, the
monitor will operate in factory mode. In this mode, the value of brightness, contrast,
black-level, red, green, phase, OSD time, color save (color temperature) is stored
as default value. During recall function, these values will be recalled again.
2.0 Theory Of Operation
2.1 Main Board
This module consists of microprocessor, Cheetah chip, AD converter, memory, clock
generator, power conversion, 3.3-volt regulator and backlight controller.
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2.1.1 A/D (AD9884A U8):
U8 is a triple 8-bit ADC with controllable amplifiers and clamps for the digitizing of
large bandwidth RGB signals. The clamp level, the gain and all of the other
settings are controlled via a serial interface, SDA (pin29), SCL (pin30).
Analog video inputs (Rin, Gin, Bin) are internal DC polarized. These inputs are AC
coupled by C46, C52, and C54 - three capacitors. ADC outputs R0~R7, G0~G7,
B0~B7 are connected to scaling IC (ASI-320) via resistor array.
2.1.2 Scaling IC (ASI-320 U14):
U14 provides memory interface, ADC interface, microprocessor interface and flat
panel interface. U14 can work either with or without the external frame buffer. The
scaling IC is the data follow center between SDRAM (U12, U13), A/D converter
(U8), MCU (U17) and LVDS transmitter (U20). Because the LVDS panel is 6
bits/color system, scaling IC also dither the 8 bits/color (from A/D) to 6bits/color
system
2.1.3 Memory:
U12~U13 (A43L0616V-7) for 1M*16 SDRAM frame buffer. 2.1.4 Power conversion:
U1: Main 5 volts output are generated by DC to DC conversion, from adapter we
get 12 volts DC input, convert 12 volts to 5 volts.
2.1.4 Regulator
3.3 volts regulator: U2, U4, U5, U6 are 3.3 volt regulators.
U2 output for LCD panel
U4 output for scaling IC (U14) and AD9884 (U8).
U5 output for SDRAM (U12, U13) and LVDS transmitter (U20)
U5 output for analog power of AD9884 (U8)
2.1.5 LVDS transmitter (U20)
U20 transmits the LVTTL color data via LVDS interface.
2.1.6 MCU (U17)
Dominate the OSD, preset mode, factory initial mode etc.
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2.2 Keypad Board:
The key status input to Main Board for function adjustments ON OSD menu.
2.3 Inverter Board:
Inverts DC to high voltage AC for driving CCFL.
3.0 Troubleshooting Instruction
3.1 No Display, Power Indicator Is Off Or Blinking
3.1.1 Check AC/DC adaptor is proper installed with power code or DC jack.
3.1.2 Make sure having pressed power key.
3.2 No Display, Power Indicator Is Orange
3.2.1 Check the connector VGA1 for RGB signals input to Main board or not.
3.2.2 Change the Main Board
3.3 No Display, Power Indicator Is Green
3.3.1 Check the connector P7 for LVDS signals input to panel or not.
3.3.2 Check the LCD panel connector.
3.3.3 Check CON4 for power input of inverter.
3.3.4 Change the inverter board
3.3.5 Change the Main board
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4.0 Video Connector Pin Assignment
Pin NO. Signal Pin NO. Signal
1 R Signal 9 -----------2 G Signal 10 Sync Ground
3 B Signal 11 -----------4 ------------ 12 DDC Serial Data Line
5 Ground 13 Horizontal Sync
6 R Ground 14 Vertical Sync
7 G Ground 15 DDC Data Clock Line
8 B Ground
5.0 Visual Inspection Criteria-LCD Panel
5.1 Criteria (acceptable)
Random R, G or B 1 dot N≦ 3
Adjacent 2 dots ≦ 1 Pairs
Bright Dot
Adjacent 3 or more dots 0 Pairs
Minimum distance between bright dots 15mm
Random R, G or B 1 dot N≦ 4
Adjacent 2 dots ≦ 1 Pairs
Dark Dot
Adjacent 3 or more dots 0 Pairs
Minimum distance between bright dots 5mm
Total bright and dark dots N≦ 7
(1) Dot smaller than half dot is not counted as a defective dot.
(2) The adjacent dots defect is defined as align vertical, horizontal and diagonal
direction.
(3) The detailed dot defect diagrams are showed as below.