HP LP2275w - 22" LCD Monitor User manual

22" LCD Color Monitor HP LP2275w
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Service
Service
Service
Horizontal Frequency
30-93kHz
TABLE OF CONTENTS
Description Page Description Page
SAFETY NOTICE
ANY PERSON ATTEMPTING TO SERVICE THIS CHASSIS MUST FAMILIARIZE HIMSELF WITH THE CHASSIS
AND BE AWARE OF THE NECESSARY SAFETY PRECAUTIONS TO BE USED WHEN SERVICING ELECTRONIC
EQUIPMENT CONTAINING HIGH VOLTAGES.
CAUTION: USE A SEPARATE ISOLATION TRANSFOMER FOR THIS UNIT WHEN SERVICING
Table Of Contents.......…..............................…........1
Revision List.…..................................……......2
1. Monitor Specification............................………........4
2. LCD Monitor Description……………………….......5
3. Operation Instruction…………..............……...........6
3.1.General Instructions.........................….............6
3.2. Control Button…………….….........……...............6
3.3 Adjusting the Picture...........................…............7
4. Input/Output Specification......……………............12
4.1. Input Signal Connector............………................12
4.2. Factory Preset Display Modes......…..................15
4.3. Power Supply Requirements..............................15
5. Panel Specification.....………………..................16
5.1.General Feature…..........................................16
5.2. Optical Characteristics…………………………17
6. Block Diagram……...................………................18
6.1 Software Flow Chart……………………………...18
6.2. Electrical Block Diagram……………..….......20
7. Schematic……………......................................22
7.1 Main Board..……….......................................22
7.2 Power Board.…….……....................................31
7.3 Inverter Board……………………………………33
7.4 Key Board.……..……....................................35
8.PCB Layout…...…….......................................36
8.1.Main Board………........................................36
8.2 Inverter Board.................................................38
8.3.Power Board…................................................39
8.4.Key Board………............….......................40
8.5.USB Board………............….......................41
9. Maintainability……….......................................42
9.1.Equipments and Tools Requirement..............42
9.2.Trouble Shooting………..............................43
10.White-Balance, Luminance adjustment...49
11.Mechanical Instructions………….…...….......51
12.Monitor Exploded View…….…………....….......56
13.BOM List……………….…………………………58
14. Different Parts List………………………………86

22" LCD Color Monitor HP LP2275w
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Revision List
Version Date Revision History TPV Model Name
A00 Jun.-25-08 Initial release TC8SGKDKW9HPEN
TC8SGKDBW9HFGN
TC8SGKDBW9HEGN
TC8SGKDLW9HPEN
A01 Aug.-19-2008 Add new BOM in item 14
TC8SGKDJW9HPEN

22" LCD Color Monitor HP LP2275w
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ECN History
ECN No. Change Description Service
Deposition
Cut-in date SMR
SCR
AOC-LP2275w-001
Update Insam firmware version
fromV0.53 to V0.58, and matching
changed Safe-Lite firmware version
from SL0528 to SL0716
N/A Jul-29-08 A01
SCR
AOC-LP2275w-002
Update the Insam firmware from
SPG058 to SPG060 to fix this issue. N/A Jul-30-08 A01
SCR
AOC-LP2275w-004
1. Re-layout the scalar board with the
PN changed from 715G2973-1 to
715G2973-2 to add the location of
R200.
2. Install R200 resistor (4.7K in
value).
3. At the same time, update Insam
firmware version from SPG058 to
SPG062, and keeping Safe-Lite
firmware version the same.
Item 13 Aug-20-08 A01
SCR
AOC-LP2275w-006
Change R852 on the inverter board
from 510 OHM to 270 OHM Item 13 Sep-10-08 A01
SCR
AOC-LP2275w-007
change the FB902 on the power
board according to FEB N/A Sep-15-08 A01
SCR
AOC-LP2275w-008
Change the screws with the longer
length and add glue to prevent hinge
screw loose
N/A Aug-12-2008 A01

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1. Monitor Specification

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2. LCD Monitor Description
The LCD Monitor will contain a main board, a power board, a key board and a USB board which house the flat panel
controllogic,brightnesscontrollogicandDDC.
The power board will provide AC to DC Inverter voltage to drive the backlight of panel and the main board chips each
voltage.
Video signal, DDC
Power Board
(
Include ada
p
ter board
)
Flat Panel and
CCFL backlight
Main Board RS232 Connector
For white balance
adjustment in
factory mode
HOST Computer
CCFT Drive.
AC-IN
110V-240V
Monitor Block Diagram
Key board USB board

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3. Operation Instructions
3.1 General Instructions
Press the power button to turn the monitor on or off. The other control buttons are located at front of the panel. By
changing these settings, the picture can be adjusted to your personal performance.
-The power cord should be connected and insert to adaptor.
- Connect the video cable from the monitor to the computer VGA card.
- Press the power button to turn on the monitor, the power indicator will light up to Green.
3.2 Control Button

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Using the On-Screen Display Menu
3.3 Adjust the Picture
The following table lists the On-Screen Display (OSD) menu selections and their functional descriptions.
After changing an OSD menu item, and if the menu screen has these options, you may choose to:
●Cancel—to return to the previous menu level.
●Save and Return—to save all changes and return to the OSD Main Menu screen. This Save and
Return option is only active if you change a menu item.
●Reset—to change back to the previous setting.

22" LCD Color Monitor HP LP2275w
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22" LCD Color Monitor HP LP2275w
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22" LCD Color Monitor HP LP2275w
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22" LCD Color Monitor HP LP2275w
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4. Input/Output Specification
4.1 Input Signal Connector
Pin Signal Pin Signal Pin Signal
1 TMDS Data 2 - 9 TMDS Data 1 - 17 TMDS Data 0 -
2 TMDS Data 2 + 10 TMDS Data 1 + 18 TMDS Data 0 +
3 TMDS Data 2 / 4 Shield 11 TMDS Data 1 / 3 Shield 19 TMDS Data 0 / 5 Shield
4 TMDS Data 4 - 12 TMDS Data 3 - 20 TMDS Data 5 -
5 TMDS Data 4 + 13 TMDS Data 3 + 21 TMDS Data 5 +
6 DDC Clock 14 +3.3/+5V Power (from PC) 22 TMDS Clock Shield
7 DDC Data 15 Ground (Return for +5V) 23 TMDS Clock +
8 No Connect 16 Hot Plug Detect (connect internally
to pin-14) 24 TMDS Clock -
DVI-D digital connector layout

22" LCD Color Monitor HP LP2275w
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PIN MNEMONIC SIGNAL
1 ML Lane 0 (p) Lane 0 +
2 GND Ground
3 ML Lane 0 (n) Lane 0 -
4 ML Lane 1 (p) Lane 1 +
5 GND Ground
6 ML Lane 1 (n) Lane 1 -
7 ML Lane 2 (p) Lane 2 +
8 GND Ground
9 ML Lane 2 (n) Lane 2 -
10 ML Lane 3 (p) Lane 3 +
11 GND Ground
12 ML Lane 3 (n) Lane 3 -
13 GND Ground
14 GND Ground
15 AUX CH (p) Aux Channel +
16 GND Ground
17 AUX CH (n) Aux Channel +
18 HPD Hot Plug Detect
19 Return Return
20 DP PWR Source Power Out (to sink)
DISPLAY-PORT DIGITAL Source connector

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PIN MNEMONIC SIGNAL
1 ML Lane 3 (n) Lane 3 -
2 GND Ground
3 ML Lane 3 (p) Lane 3 +
4 ML Lane 2 (n) Lane 2 -
5 GND Ground
6 ML Lane 2 (p) Lane 2 +
7 ML Lane 1 (n) Lane 1 -
8 GND Ground
9 ML Lane 1 (p) Lane 1 p
10 ML Lane 0 (n) Lane 0 -
11 GND Ground
12 ML Lane 0 (p) Lane 0 +
13 GND Ground
14 GND Ground
15 AUX CH (p) Aux Channel +
16 GND Ground
17 AUX CH (n) Aux Channel +
18 HPD Hot Plug Detect
19 Return Return
20 DP PWR Source Power In
DISPLAY-PORT DIGITAL SINK connector

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4.2 Factory Preset Display Modes
4.3 Power Supply Requirements
Parameter Range
AC Input Voltage 90 to 265V
AC Input Frequency 45 to 63 Hz
Inrush Current 50A MAX AT 220VAC and 30A AT 120VAC
Leakage Current 5 mA MAX at 120VAC

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5. Panel Specification
LTM1220M3-L02 is a Color Active Matrix Liquid Crystal Display (LCD)that uses amorphous silicon TFT （Thin Film
Transistor）as switching components。This model is composed of a TFT LCD panel, a driver circuit and a back light
unit.The resolution of a 22.0” is 1680 X 1050 and this model can display up to 16.7 million colors.
Features:
High contrast ratio,high aperture structure,high color gamut
Wide viewing anle
High speed reponse
WSXGA+(1680 x 1050 pixels)resolution
S-PVA(super patterened vertical alignment)mode
U-type 6CCFTS(Cold cathode fluorescent Tube)
DE (Data Enable)mode
LVDS(Low Voltage differential Signaling)interface(2pixel/clock)
ROHS compliance
Pb-free compliance
5.1 General Feature
Absolute Maximum Ratings

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5.2 Optical Characteristics

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6. Block diagram
6. 1 Software Flow Chart
1
2
N
Y
5
Y
N
10
Y
N
12
Y
N
7
Y
N
6
4
3
8
9
14
11
13
Y
N
15
Y
N
16
17
19
Y
N
18

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REMARK:
1) MCU initialize.
2) Is the EEprom blank?
3) Program the EEprom by default values.
4) Get the PWM value of brightness from EEprom.
5) Is the power key pressed?
6) Clear all global flags.
7) Are the AUTO and SELECT keys pressed?
8) Enter factory mode.
9) Save the power key status into EEprom.
Turn on the LED and set it to green color.
Scalar initialize.
10) In standby mode?
11) Update the lifetime of back light.
12) Check the analog port, are they’re any signals coming?
13) Does the scalar send out an interrupt request?
14) Wake up the scalar.
15) Are there any signals coming from analog port?
16) Display "No connection Check Signal Cable" message. And go into standby mode after the message
disappear.
17) Program the scalar to be able to show the coming mode.
18) Process the OSD display.
19) Read the keyboard. Is the power key pressed?

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6.2 Electrical Block Diagram
6.2.1 Scalar Board
PANEL Interface
CN403
Scalar GM5862H-LF PQFP-256
(Include: MCU, ADC, OSD etc)
U401
Crystal
14.318MHZ
X401
EEPROM
SST25LF040A
U402
MST30D1-LF
U110
DISPLAY PROTECION
GM69010
U104
DVI CN101
EEPROM
U102& U103
DISPLAY PORT
CN102
SDRAM
EM636165TS-5G
U404
SDRAM
EM636165TS-5G
U405