AOC L1950g Service Manual
19" LCD Color Monitor HP L1950g
Service
Service
Service
Horizontal Frequency
24- 83 kHz
TABLE OF CONTENTS
Description Page Description Page
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......…..................11
5. Panel Specification.....………………..................12
5.1. General Feature…….....………………..................12
5.2. Optical Characteristics………………………………14
6. Block Diagram……...................…………................16
6.1 Software Flow Chart………………………………...16
6.2.Electrical Block Diagram……………..….......18
7. Schematic……………......................................20
7.1 Main Board....……….......................................20
7.2 Power Board.….……....................................24
7.3 Key Board…………………………………………..26
7.4 USB Board…………………………………………27
8.PCB Layout..…….......................................28
8.1. Main Board………........................................28
8.2. Power Board….......................................29
8.3. Key Board………............….......................31
8.4 USB Board…………………………………………32
9. Maintainability……….......................................33
9.1. Equipments and Tools Requirement..............33
9.2. Trouble Shooting……….............................34
9.2.1 Main Board…………..............................34
9.2.2 Power Board………..............................36
9.2.3 Key Board…………..............................38
10 White-Balance, Luminance adjustment...39
11.Mechanical Instructions……………..…...….......41
12. Monitor Exploded View………………..…....….......47
13. BOM List………………………………..……………48
14. Different Parts List.........…………..........................62
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
1
19" LCD Color Monitor HP L1950g
Revision List
Version Date Revision History TPV Model Name
T98HMMDKHNHEQNE
T98SMMDKHNHEQNE
A00 Jun.-27-2008
Add TPVDW Model in Item 14
A01 Nov.-06-2008
Initial release
Panel List
T98HMMDBHNHEQNE
T98SMMDBHNHEQNE
T98HMMDLHNHEQNE
HSD190MEN3
LTM190EX-L31 QLC
T98GMMDKHNHEQ1E
T98GMMDKHNHEQNE
T98GMMDLHNHEQNE
T98GMMDTHNHEQNE
T98GMMDBHNHEQNE
T98GMMDBHNHEQ1E
T98GMMDDHNHEQ1E
T98GMMDBHNHEQCE
T98GMMDKHNHEQCE
T98GMMDLHNHEQCE
T98GMMDLHNHEQ1E
T98GMMDKHNHE11E
T98GMMDTHNHEQCE
T98GMMDTHNHEQ1E
T98HMMDDHNHEQNE
T98AMMDDHNHEQNE
T98GMMDDHNHEQNE
T98AMMDLHNHEQNE
T98GMMDDHNHEQCE
LM190E08-TLG2 GZ LPL
Add Second Panel list in Item 5
LM190E08-TLL1 LPL
M190EG02 V400 SZ AUO
2
19" LCD Color Monitor HP L1950g
1. Monitor Specification
3
19" LCD Color Monitor HP L1950g
(
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.
Power Board
Include adapter board)
AC-IN
110V-240V
Monitor Block Diagram
CCFT Drive.
Main Board
Keyboard
Flat Panel and
CCFL backlight
RS232 Connector
For white balance
adjustment in
factory mode
Video signal, DDC
HOST Computer
4
19" LCD Color Monitor HP L1950g
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
5
19" LCD Color Monitor HP L1950g
3.3 Adjust the Picture
6
19" LCD Color Monitor HP L1950g
7
19" LCD Color Monitor HP L1950g
8
19" LCD Color Monitor HP L1950g
9
19" LCD Color Monitor HP L1950g
4. Input/Output Specification
4.1 Input Signal Connector
4.1.1 D-SUB connector
Pin Signal Pin Signal
1 Red Video 9 3.3/+5 V (from PC)
2 Green Video 10 Sync Ground
3 Blue Video 11 None
4 None 12 DDC Data
5 Ground (DDC Return) 13 Horizontal Sync
6 Red GND 14 Vertical Sync
7 Green GND 15 DDC Clock
8 Blue GND
4.1.2 DVI-D connector
Pin No.
1 TMDS Data 2- 13 TMDS Data 3+
2 TMDS Data 2+ 14 +5V Power
3 TMDS Data 2/4 Shield 15 Ground(for+5V)
4 TMDS Data 4- 16 Hot Plug Detect
5 TMDS Data 4+ 17 TMDS Data 0-
6 DDC Clock 18 TMDS Data 0+
7 DDC Data 19 TMDS Data 0/5 Shield
PIN 1
PIN 11
Signal Name
VGA connector layout
PIN 5
Pin No.
Signal Name
8 N.C. 20 TMDS Data 5-
9 TMDS Data 1- 21 TMDS Data 5+
10 TMDS Data 1+ 22 TMDS Clock Shield
11 TMDS Data 1/3 Shield 23 TMDS Clock +
12 TMDS Data 3- 24 TMDS Clock -
24 - Pin Color Display Signal Cable
10
19" LCD Color Monitor HP L1950g
4.2 Factory Preset Display Modes
11
19" LCD Color Monitor HP L1950g
5. Panel Specification
5.1 General Feature
HSD190MEN3
LTM190EX-L31 QLC
12
19" LCD Color Monitor HP L1950g
LM190E08-TLG2/LM190E08-TLL1 LPL
M190EG02 V400 SZ AUO
13
19" LCD Color Monitor HP L1950g
5.2 Optical Characteristics
HSD190MEN3
LTM190EX-L31 QLC
14
19" LCD Color Monitor HP L1950g
LM190E08-TLG2/LM190E08-TLL1 LPL
M190EG02 V400 SZ AUO
15
19" LCD Color Monitor HP L1950g
6. Block diagram
6. 1 Software Flow Chart
1
Y
2
N
3
4
5
N
Y
6
N
7
8
Y
9
10
N
11
12
Y
13
N
N
Y
14
15
Y
N
16
Y
17
18
N
19
Y
16
19" LCD Color Monitor HP L1950g
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?
17
19" LCD Color Monitor HP L1950g
6.2 Electrical Block Diagram
6.2.1 Scalar Board
EEPROM
(U402)
EPR_SDA
EPR SCL
DB15_SDA,
DB15 SCL
Panel Interface
H sync
V sync
D-Sub Connector
RGB
(CN101)
(CN401)
Scalar HUM56AWL-LF
(Include ADC、OSD、MCU)
(U401)
Crystal
X201
14.318Mhz
DVI Connector
RGB
CLK+
CLK-
(CN102)
SDA,
SCL
EEPROM
M24C02
(U101)
EEPROM
M24C02
(U102)
18
19" LCD Color Monitor HP L1950g
6.2.2 Inverter / Power Board
AC input
EMI filter
Bridge
Rectifier
and Filter
Start Circuit
Transformer
Rectifier
diodes
CN902
12V
Lamp
PWM Control IC
LC
Resonance
Feedback
Circuit
Over
Voltage
Transformer
Over
Voltage
Protect
MOSFET
PWM
Control IC
Feedback
Circuit
5V
ON/OFF
ON/OFF
Control
DIM
19
19" LCD Color Monitor HP L1950g
7. Schematic
7.1 Main Board
2
D107
RLZ5.6B
2
1
R102 100R 1/16W
R103 100R 1/16W
C102
22pF
R106
2K2 1/16W
VGA_PLUG
DSUB_5V
ZD103
RLZ5.6B
VGA_G+
3
D103
BAV99
2
1
R119 100R 1/16W
R122 100R 1/16W
D108
RLZ5.6B
3
3
D113
BAV99
2
1
VGA_B+
3
D114
BAV99
D104
BAV99
1
1
ZD104
RLZ5.6B
2
DSUB_H 2
DSUB_V 2
C103
22pF
CMVCC
C118
C112
0.1uF/ 16V
0.1uF/ 16V
DDC2_SCL
DDC2_SDA
R126 10R 1/16W
R127 10R 1/16W
R128 10R 1/16W
R129 10R 1/16W
R130 10R 1/16W
R131 10R 1/16W
3
3
D115
D116
BAV99
BAV99
1
1
2
3
2
VGA_B+
VGA_B-
VGA_G+
VGA_G-
VGA_R+
VGA_R-
DDC2_SCL 2
DDC2_SDA 2
RX0P
RX0N
RX1P
RX1N
RX2P
RX2N
R133 10R 1/16W
R136 10R 1/16W
CMVCC
12
D117
BAV99
1
C117
0.1uF/ 16V
1 2
1 2
1 2
RX0P 2
RX0N 2
RX1P 2
RX1N 2
RX2P 2
RX2N 2
FB104
120OHM
C119
0.1uF/ 16V
FB102
BEAD
FB103
BEAD
FB101
BEAD
RXCP
RXCN
R107
75R 1/16W
R112
75R 1/16W
R116
75R 1/16W
R125
NC
RXCP 2
RXCN 2
DVI_HPD
R138 10K 1/16W
VGA_PLUG
R139 6K8 1/16W
T P V ( Top Victory Electronics Co . , Ltd. )
G2559-1-3-X-2-070719
线路图编号
Key Component
02 Input
Date
R104 100R 1/16W
C104
5pF/50V
R108 100R 1/16W
R109 470R 1/16W
R111 100R 1/16W
C108
5pF/50V
R114 100R 1/16W
R115 100R 1/16W
C111
5pF/50V
R117 100R 1/16W
R124 NC
Q101
NC
VCC3.3
R137
10K 1/16W
HPD_CTRL 2
DET_CABLE 2
C101
0.047uF
C105
0.047uF
C106
1000pF
C107
0.047uF
C109
0.047uF
C110
0.047uF
C113
0.047uF
OEM MODEL Size
TPV MOD EL
PCB NAME
Sheet
DSUB_B+ 2
DSUB_B- 2
DSUB_SOG 2
DSUB_G+ 2
DSUB_G- 2
DSUB_R+ 2
DSUB_5V
CMVCC
1
DSUB_R- 2
R120
4K7 1/16W
DDC1_SCL
DDC1_SDA
DDC_WP2
4K7 1/16W
DDC2_SCL
DDC2_SDA
DDC_WP2
HP L1750/L1950 B
715G2559-1-3
of
25Thursday, July 19, 2007
R134
R121
4K7 1/16W
R135
4K7 1/16W
2
3
R118
10K 1/16W
8
7
6
CMVCC
2
3
R132
10K 1/16W
8
7
6
U101
VCC
WP
SCL
M24C02-WMN6TP
DVI_5V
1
U102
VCC
WP
SCL
M24C02-WMN6TP
Rev
备注
D105
BAV70
0.1uF/ 16V
A0
A1
A2
VSSSDA
D101
BAV70
0.1uF/ 16V
A0
A1
A2
VSSSDA
备注
C114
1
2
3
45
C116
1
2
3
45
-1-3
DDC1_SCL2
DDC1_SDA2
CN102 JACK
VSYN C
SYN C GND
DDC SCL
DDC SDA
1/3shield
2/4shield
0/5shield
clk shield
DAT0+
DAT0-
DAT1+
DAT1-
DAT2+
DAT2-
DAT3+
DAT3-
DAT4+
DAT4-
DAT5+
DAT5-
GND
26
25
GND POWER
HPD
clk+
GND
+5V
clk-
DDC1_SC L
DDC1_SD A
8
15
6
7
14
HOT_PLUG
16
11
3
19
22
18
17
10
9
2
1
13
12
5
4
21
20
23
24
DGND
R110
100R 1/16W
R113
100R 1/16W
ZD105
RLZ5.6B
DVI_HPD
ZD106
RLZ5.6B
DVI_5V
D109
RLZ5.6B
ZD101
RLZ5.6B
C115
0.1uF/ 16V
3
2
15
14
13
12
11
D110
BAV99
R101 0R05 1/16W
ZD102
RLZ5.6B
CN101
10
5
9
4
8
3
7
2
6
1
DB15
17 16
2
R123 10K 1/16W
D106
RLZ5.6B
3
D111
BAV99
1
2
1
2K2 1/16W
DSUB_5V
VGA_R+
3
2
R105
VGA_BVGA_B+
VGA_GVGA_G+
VGA_RVGA_R+
D102
BAV99
1
3
D112
BAV99
20
19" LCD Color Monitor HP L1950g
VDDC
VDDP
VMPLL
14
AVDD_D VI
98
AVDD_D VI
VPLL
163249
AVDD_PLL
AVDD_M PLL
GND
GND
GND
2
5
112933
24
AVDD
AVDD_ADC
GND
GND
VDDP
VDDP
LVDS
GND
GND
GND
5057767983
56
75
VDDP
VDDP
GND
GND
U401
51
668234
HUM56AWL-LF
VCTRL
VDDC
VDDC
VDDC
VDDC
LVA3P
LVA3M
LVACKP
LVACKM
LVA2P
LVA2M
LVA1P
LVA1M
LVA0P
LVA0M
LVB3P
LVB3M
LVBCKP
LVBCKM
LVB2P
LVB2M
LVB1P
LVB1M
LVB0P
LVB0M
GPIO_P23
GPIO_P22
GPIO_P15/PW M0
PWM2/GPIO_P24
GPIO_P12
PWM1/GPIO_P25
RSTN
GPIO_P00/SAR1
GPIO_P01/SAR2
GPIO_P02/SAR3
GPIO_P06
GPIO_P07
PWM0/GPIO_P26
GPIO_P13
GPIO_P14
GPIO_P16/PW M2
GPIO_P10/I2C_MCL
GPIO_P11/I2C_MDA
81
54
55
58
59
60
61
62
63
64
65
67
68
69
70
71
72
73
74
77
78
36
NC
45
NC
46
NC
41
42
35
47
85
86
87
88
89
90
91
92
93
94
95
99
44
43
PA0
PA1
PA2
PA3
PA4
PA5
PA6
PA7
PA8
PA9
PB0
PB1
PB2
PB3
PB4
PB5
PB6
PB7
PB8
PB9
EE_WP
R207 100R 1/16W
R213 100R 1/16W
R214 100R 1/16W
R215 100R 1/16W
R217 4K7 1/16W
R218 4K7 1/16W
R220 NC
R221 NC
R222 100R 1/16W
R224 100R 1/16W
R225 100R 1/16W
MSCL
MSDA
PA[0..9]
PB[0..9]
PANEL_VCC
WP
HPD_CTRL 1
Mute 4
R233
6K8 1/16W
R234 10K 1/16W
C231
0.1uF/ 16V
KEY2
KEY1
PA[0..9] 3
PB[0..9] 3
R202
22K 1/16W
R203
10K 1/16W
on_BACKLIGH T 4
adj_BACKLIGHT 4
DET_CABLE 1
POWER_KEY#
R223 10K 1/16W
C217
0.1uF/16V
VCC3.31
Q201
2N3904S-RTK/PS
VCC3.3
VCC3.3
VCC1.84
DDC_WP 1
CMVCC
R208
6K8 1/16W
R211 10K 1/16W
C219
0.1uF/ 16V
VCC1.8
1
C202
10uF/50V
FB205
0R05 1/8W
C209
NC
10K 1/16W
32
Q205
NC
VDDP
+
C203
0.1uF/1 6V
VDDC
+
0.1uF/ 16V
VCC3.3
R209
R216 56 OHM 1/ 16W
C204
0.1uF/1 6V
C211
C212
0.1uF/1 6V
Q203
2N3906S-RTK/PS
Volume# 4
C205
0.1uF/ 16V
C214
C213
0.1uF/ 16V
LED_GRN/BLUE
C206
0.1uF/1 6V
0.1uF/ 16V
10K 1/16W
VCC3.3
R205
VCC3.3
FB203
300OHM
FB201
300OHM
AVDD
C207
0.1uF/ 16V
VMPLL
C210
0.1uF/16V
VCC3.3
Q202
2N3906S-RTK/PS
VCC3.3
FB204
300OHM
VCC3.3
FB206
0R05 1/8W
R212 75R 1/16W
VPLL
VDVI
C215
0.1uF/ 16V
LED_ORANGE
C208
0.1uF/ 16V
C216
0.1uF/16V
VCC3.3
C218
0.22uF16V
R21010K 1/16W
CMVCC
1
CE
2
SO
WP
3
WP#
4 5
GND SI
PM25LV010A
C220
+
10uF/50V
change C221 from
22pf to 33pf
Change C222 from
22pf to 27pf
U402
HOLD#
VCC
SCK
8
7
6
R219
100K 1/16W
C221 33pF
C222 27pF 50V
DSUB_R+1
DSUB_R-1
DSUB_G+1
DSUB_G-1
DSUB_SOG1
DSUB_B+1
DSUB_B-1
DSUB_H1
DSUB_V1
DDC1_SDA1
DDC1_SCL1
DDC2_SDA1
DDC2_SCL1
AVDD
PPWR_ON#3
R201 0R05 1/ 16W
RX2P1
RX2N1
RX1P1
RX1N1
RX0P1
RX0N1
RXCP1
RXCN1
R204 390 OHM 1/16W
0.1uF/ 16V
C201
X201
14.31818MHz
1 2
C223 0.1uF/ 16V
R226
10K 1/16W
VDVI
23
RIN0P
22
RIN0M
20
GIN0P
19
GIN0M
21
SOGIN0
18
BIN0P
17
BIN0M
27
HSYNC0
28
VSYNC 0
30
DDCA_SD A/RS232_TX
31
DDCA_SCL/rs232_RX
3
R+
4
R-
6
G+
7
G-
9
B+
10
B-
12
CK+
13
CK-
100
DDCD_SDA
1
DDCD_SCL
15
REXT
26
REFP
25
REFM
37
SDO
38
SCZ
39
SCK
40
SDI
48
GPIO_P27/PWM1
84
RST
96
XIN
97
XOU T
80
BYPASS
52
MODE [0]
53
MODE [1]
R227
10K 1/16W
8
R230
10K 1/16W
MSCL
MSDA
R231
10K 1/16W
EE_WP
R232
10K 1/16W
U204
8
VCC
NC
7
E1
WC
6
E2
SCL
VSSSDA
M24C04-WMN6TP
C224
0.22uF16V
1
2
3
45
VCC3.3
R236
NC
MSCL
MSDA
HDCP Key EEPROM
8
7
U201 NC
VCC3.3
R228
VCC3.3
1
R235 NC
2
3456
C230
NC
CN201
CONN
3.9K OHM 1/16W
1
2
3
4
5
6
C225
0.1uF/ 16V
Near to Connect
21
R229
3.9K OHM 1/16W
C226
C227
0.1uF/ 16V
0.1uF/ 16V
T P V ( Top Victory Electronics Co . , Ltd. )
线路图编号
Key Component
Date
C228
0.1uF/ 16V
G2559-1-3-X-2-070719
03.Scalar
C229
0.1uF/ 16V
KEY1
KEY2
POWER_KEY#
LED_GRN/BLUE
LED_ORANGE
OEM MODEL Size
HP L1750/L1950 C
TPV MOD EL
PCB NAME
715G2559-1-3
Sheet
of
35Thursday , July 19, 2007
Rev
-1-3
备注
备注
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