HP LE1851w - Widescreen LCD Monitor User manual

18.5" LCD Color Monitor HP LE1851w
1
Service
Service
Service
HorizontalFrequency
24-83kHz
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..............................………........3
2. LCD Monitor Description…………………………….......4
3. Operation Instruction…………...............……..........5
3.1. General Instructions...........................…...........5
3.2. Control Button…………….…..............……...............5
3.3 Adjusting the Picture...........................…......... ..6
4. Input/Output Specification............……………...........10
4.1. Input Signal Connector............…………................10
4.2. Factory Preset Display Modes......…..................10
5. Panel Specification.....………………..................11
5.1. General Feature…….....………………..................11
5.2. Optical Characteristics………………………………11
5.3 Parameter guide line for CCFL Inverter……………..13
6. Block Diagram……...................…………................15
6.1 Software Flow Chart………………………………...15
6.2.Electrical Block Diagram……………..….......17
7. Schematic……………......................................19
7.1 Main Board....……….......................................19
7.2 Power Board.….……....................................24
7.3 Key Board…………………………………………..26
8.PCB Layout..…….................................. ........ ..... ...27
8.1. Main Board………........................................27
8.2. Power Board….......................................28
8.3. Key Board………............….......................30
9. Maintainability……….......................................31
9.1. Equipments and Tools Requirement..............31
9.2. Trouble Shooting……….............................32
9.2.1 Main Board…………..............................32
9.2.2 Power Board………..............................34
9.2.3 Key Board…………..............................36
10 White-Balance, Luminance adjustment...37
11.Mechanical Instructions……………..…...….......39
12. Monitor Exploded View………………..…....….......42
13. BOM List………………………………..……………43
14. Different Parts List.........…………..........................53

18.5" LCD Color Monitor HP LE1851w
2
Revision List
Version Date Revision History TPV Model Name
T89MM5DBRWHPNNE
T89MM5DBRWHPNCE
T89SM5DBRWHPNNE
Initial release
T89SM5DBRWHPNCE
M185B1-L02
A00 Mar.-16-2009
Panel List in Item 5
LTM185AT01 Q01 / Q02

18.5" LCD Color Monitor HP LE1851w
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1. Monitor Specification

18.5" LCD Color Monitor HP LE1851w
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2. LCD Monitor Description
The LCD Monitor will contain main board, power board, a key board which house the flat panel control logic, brightness
control logic and DDC.
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
Keyboard

18.5" LCD Color Monitor HP LE1851w
5
3. Operation Instructions
3.1 General Instructions
The monitor settings can be adjusted from the On-Screen Display (OSD) menu. To access the OSD
and adjust screen settings base on your viewing preference, do the following:
1. If the monitor is not already on, press the power button to turn on the monitor. The power indicator
will light up.
2. To access the OSD menu, press the Menu button.
3. To navigate through the Main Menu, press the – or + buttons. Once the desired function is
highlighted, press the Menu button to activate the Submenu. Press the Menu button to select the
highlighted function.
4. Press the – or + button to change the settings of the selected function. Press the – or + button to
select another function in the Submenu.
5. Press Auto/OK to select the highlighted function.
3.2 Control Button

18.5" LCD Color Monitor HP LE1851w
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3.3 Adjust the Picture

18.5" LCD Color Monitor HP LE1851w
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18.5" LCD Color Monitor HP LE1851w
8

18.5" LCD Color Monitor HP LE1851w
9

18.5" LCD Color Monitor HP LE1851w
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4. Input/Output Specification
4.1 Input Signal Connector
4.1.1 D-SUB connector
Pin Signal Pin Signal
1 Red Video 9 +5V Supply
2 Green Video 10 Logic Ground
3 Blue Video 11 NC
4 NC 12 DDC-Serial Data
5 DDC-Return 13 H-Sync.
6 Red Ground 14 V-Sync.
7 Green Ground 15 DDC-Serial Clock
8 Blue Ground
VGA connector layout
PIN 1 PIN 5
PIN 11
4.2 Factory Preset Display Modes

18.5" LCD Color Monitor HP LE1851w
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5. Panel Specification
5.1 General Feature
M185B1-L02
LTM185AT01 Q01/Q02
5.2 Optical Characteristics
M185B1-L02

18.5" LCD Color Monitor HP LE1851w
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LTM185AT01 Q01/Q02

18.5" LCD Color Monitor HP LE1851w
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5.3 Parameter guide line for CCFL Inverter
1.TFT LCD Module:
M185B1-L02
LTM185AT01 Q01/Q02
2. Back Light Unit:
M185B1-L02

18.5" LCD Color Monitor HP LE1851w
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LTM185AT01 Q01/Q02

18.5" LCD Color Monitor HP LE1851w
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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

18.5" LCD Color Monitor HP LE1851w
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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?

18.5" LCD Color Monitor HP LE1851w
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6.2 Electrical Block Diagram
6.2.1 Scalar Board
Scalar TSUM1PFR-LF
(Include ADC、OSD、MCU)
(U401)
FLASH MEMORY
PM25LV010A (U402)
D-Sub Connector
(CN101)
EPR_SDA
EPR SCL
Panel Interface
(CN403)
EEPROM
M24C02
(U104)
H sync
V sync
RGB
EEPROM
M24C04
(U403)
DB15_SDA,
DB15 SCL

18.5" LCD Color Monitor HP LE1851w
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6.2.2 Inverter / Power Board
CN902
DIM
EMI filter Bridge
Rectifier
and Filter
Start Circuit
PWM
Control IC
Transformer Rectifier
diodes
AC input
12V
ON/OFF
Control
PWM
Control IC
Feedback
Circuit
LC
Resonance
Transformer MOSFET
Over
Voltage
Lamp
ON/OFF
Feedback
Circuit
Over
Voltage
Protect
5V

18.5" LCD Color Monitor HPLE1851w
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7. Schematic
7.1 Main Board
05.Power
on_BACKLIGHT
BKLT_VBRI
VCC1.8
CMVCC
VCC3.3
DSUB_5V
VCTRL
ESD_VCC
ESD_VCC
PA[0..1]
TSUM1PFR SCHEMATIC
CMVCC
ESD_VCC
03.Scalar
DSUB_R+
DSUB_G+
DSUB_SOG
DSUB_B+
DSUB_R-
DSUB_G-
DSUB_B-
DSUB_H
DSUB_V
BKLT_VBRI
VCC1.8
VCC3.3
PA[0..1]
PB[0..9]
DDC1_SDA
DDC1_SCL
DET_CABLE
on_BACKLIGHT
PPWR_ON#
CMVCC
PA[4..9]
VCTRL
DDC_WP
CMVCC
1E
HP L1908w LE1851w A
37Tuesday , February 10, 2009
715G3083-1E <
称爹 >
01.COVER & REVISE HISTORY & TOP
G3083-1E-X-X-2-090210
OEM MODEL Size
Rev
Date Sheet of
TPV MODEL
PCB NAME
称爹
T P V ( Top Victory Electronics Co . , Ltd. )
Key Component
絬 隔 瓜 絪 腹
02.Input
DSUB_R+
DSUB_G+
DSUB_B+
DSUB_V
DSUB_R-
DSUB_G-
DSUB_B-
DET_CABLE
DSUB_H
DSUB_SOG
DDC1_SDA
DDC1_SCL
DSUB_5V
ESD_VCC
VCC3.3
DDC_WP
XGA/SXGA
VCC1.8
VCC1.8
PA[4..9]
04.Output
CMVCC
PB[0..9]
PA[0..1]
PPWR_ON#
PA[4..9]
DSUB_5V
VCC3.3
VCC3.3
CMVCC
PB[0..9]
DSUB_5V
LVDS OUTPUT
VCC3.3

18.5" LCD Color Monitor HPLE1851w
20
1E
HP L1908w LE1851w B
47Wednesday , F ebruary 18, 2009
715G3083-1E <
称爹 >
02.Input
G3083-1E-X-X-2-090210
OEM MOD EL Si ze
Rev
Date Sheet of
TPV MO DEL
PCB NAME
称爹
T P V ( Top Victory Electronics Co . , Ltd. )
Key Component
絬 隔 瓜 絪 腹
DSUB_SCL
DSUB_5V
R107
75R 1/16W 5%
R110
100R 1/16W 5%
C101
22pF
R112
470R 1/16W 5%
ESD_VC C
DSUB_R+ 5
R117
100R 1/16W 5%
DSUB_5V
C110
0.047uF
C114
NC
C107
0.047uF
DDC1_SDA5
V_Sy nc
DSUB_G- 5
ESD_VC C 7
R115
75R 1/16W 5%
DDC1_SCL5
DSUB_H 5
C102
0.047uF
C103
22pF
VGA_R+
R116
100R 1/16W 5%
R106
2K2 1/16W 5%
DDC_WP 5
Close to U102
GND POWER
C109
0.047uF
VGA_G-
VGA_R+
DGND
C108
5pF/50V
DDC1_SCL
ESD_VCC
U104
M24C02-WMN6TP
1
2
3
4 5
6
7
8
A0
A1
A2
VSS SDA
SCL
WP
VCC
VGA_B+
R114
100R 1/16W 5%
Add EDID Eeprom stucture
R121
10K 1/16W 5%
DSUB_SDA
U101
AZC099-04S
1
2
3 4
5
6
I/O1
GND
I/O2 I/O3
VDD
I/O4
R108
10K 1/16W 5%
C104
5pF/50V
DDC1_SDA
DSUB_SDA
VGA_G+
VCC3.3 5,7
VCC3.3
CMVCC
VGA_R+
R118
75R 1/16W 5%
VGA_B-
ESD_VC C
VGA_PLUG
R105
2K2 1/16W 5%
DET_CABLE 5
C112
0.047uF
DDC1_SDA
U102
AZC099-04S
1
2
3 4
5
6
I/O1
GND
I/O2 I/O3
VDD
I/O4
VGA_PLUG
VGA_B-
VGA_G+
FB103
BEAD
1 2
CN101
DB15
1
6
2
7
3
8
4
9
5
11
12
13
14
15
10
17 16
C106
1000pF
C113
NC
C105
0.047uF
R101 0R05 1/10W 5%
R103 1K 1/16W 5%
VGA_R-
DSUB_SCL
ESD_VC C
V_Sy nc
DSUB_V 5
VGA_B+
R109
10K 1/16W 5%
R104
100R 1/16W 5%
C111
5pF/50V
FB101
BEAD
1 2
R120
10K 1/16W 5%
Close to U101
R111
100R 1/16W 5%
DSUB_SOG 5
VGA_PLUG
FB102
BEAD
1 2
VGA_R-
D101
BAV70
3
1 2
R119
100R 1/16W 5%
R102 1K 1/16W 5%
DSUB_B- 5
DDC1_SCL
DSUB_5V
DSUB_R- 5
H_Sy nc
DSUB_B+ 5
C115
0.1uF/16V
VGA_G+
R113
100R 1/16W 5%
DGND
H_Sy nc
VGA_G-
ZD101
RLZ5.6B
1 2
VGA_B+
DSUB_G+ 5