Lenovo L2021 Wide User manual

LenovoServiceManual L2021W
1
联想显示器维修手册
Brand: Lenovo
Model: L2021 Wide
L2021WA

LenovoServiceManual L2021W
2
REVISION LIST
Version Release
Date Revision History Model TPV Model No Editors Redactor
A00 May-15-2010 Initial Release L2021W TAASRJEYXAG1HNJ TPV-BJ-Rain
A01 Aug-30-2011 Update Part 9 L2021W
L2021WA
TAASRJEYXAG1HNJ
TAAMRJEYXAG1HNJ
TAASRJEYXAG1H2J
TPV-BJ-Rain

LenovoServiceManual L2021W
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CONTENTS
1. LCD Specifications ....................................................................................................4
1.1 Product Features............................................................................................................................4
1.2 Factory preset modes.....................................................................................................................5
2.Operation instruction................................................................................................. 6
2.1 Control Buttons..............................................................................................................................6
2.2 OSD User mode adjustment..........................................................................................................7
3.Interface description................................................................................................. 11
3.1 VGA Interface description ..........................................................................................................11
3.2 DVI Interface description............................................................................................................11
4. Panel Feature ........................................................................................................... 12
4.1 General Specifications.................................................................................................................12
4.2Absolute Maximum Ratings........................................................................................................12
4.3 Electrical Characteristics............................................................................................................13
4.4 Panel Block Diagroam.................................................................................................................14
4.5 LVDS Connector pinAssignment...............................................................................................14
5.Block Diagram .......................................................................................................... 15
5.1 LCD Block Diagram...................................................................................................................15
5.2 MainBoard Block Diagram.........................................................................................................15
5.3 Power/ Inverter Board Block Diagram......................................................................................16
5.4 Software Flow Chart....................................................................................................................17
6. Circuit Schematic.................................................................................................. 18
6.1 Main Board---715G3327-1 ..........................................................................................................18
6.2 Power Board715G4174-2.............................................................................................................23
6.3 Inverter part.................................................................................................................................24
6.4 Key Board715G3248/715G3249..................................................................................................25
7.Explore Views............................................................................................................ 26
8. PCB Layout.............................................................................................................. 27
8.1 MainBoard- 715G3327-1............................................................................................................27
8.2 PowerBoard 715G4174................................................................................................................29
8.3 KeyBoard......................................................................................................................................31
9. Maintenance........................................................................................................... 32
9.1 Maintainability Requirement .....................................................................................................32
9.2 Disassembly SOP..........................................................................................................................32
9.3 Trouble Shooting..........................................................................................................................37
9.4 software update step....................................................................................................................42
9.5 Writing DDC program step.........................................................................................................48
9.6 Factory mode adjustment............................................................................................................51
10.BOM List................................................................................................................. 53
10.1 Model：TAASRJEYXAG1HNJ...............................................................................................53

LenovoServiceManual L2021W
4
1. LCD Specifications
1.1 Product Features
Model Lenovo L2021Wide / L2021WA
LCD Panel
Driving system TFT Color LCD
Active Display Area 442.8 (W)×249.07(H)mm 508.0mm(20.0”)
Pixel Pitch 0.2768 mm×0.2768mm
Max. Resolution 1600 x 900@75Hz
Display Colors 16.7M Colors
Input
Video
R,G,B Analog Interface，75ohm,0.7V Positive
DVI Digital Interface 150mV~1200mV
Separate Sync. H/V TTL
H-Frequency 30kHz--80kHz
V-Frequency 60Hz--75Hz
Input Connector
D-Sub 15pin
DVI 24pin
Dot Clock 160MHz
Plug & Play VESA DDC/CI
Power Consumption
ON Mode <27W
Power Saving Mode <1W at 100Vac & 240Vac
Switch OFF <0.5W
Power Source 90~264VAC,47~63Hz, 1.5A Max supply current
Environmental
Considerations
Operating Temp: 0° to 40°C
Storage Temp.: -20° to 60°C
Operating Humidity : 8% to 80%
Dimensions(including stand) 475.9(W)x357.5(H)x151.2 (D)mm
Weight (N. W.): 4.20kg
Safety approval CCC CSC EPA TCO5.0 etc

LenovoServiceManual L2021W
5
1.2 Factory preset modes
Display modes Refresh rate
640×350 70Hz
640×480 60Hz,72Hz,75Hz
720×400 70Hz
800×600 56Hz, 60Hz, 72Hz,75Hz
832×624 75Hz
1024×768 60Hz, 70Hz,75Hz
1152×864 75Hz
1280×768 60Hz
1280×1024 60Hz, 70Hz,75Hz
1366×768 60Hz
1440×900 60Hz, 75Hz
1600×900 60Hz, 75Hz

LenovoServiceManual L2021W
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2.Operation instruction
2.1 Basic connection
The power cord should be connected.
Connect the video cable from the video card of the PC to the monitor.
Press the power button to turn on the monitor, the power indicator will light up.
Press the power button to turn the monitor on or off.
The other control buttons are located at front panel of the monitor. By changing these settings, the picture can be
adjusted to your personal preferences.
2.2 Control Buttons

LenovoServiceManual L2021W
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Icon Control Description
1
Input select Switches the video input source.DVI/D-SUB
DDC-CI Pressed till 10 seconds, will enable/disable the DDC/CI.
Exit Exit current OSD return to last level.
2
Auto Press，Automatically adjust the image
Decrease - adjusting OSD, it will decrease current value of bar, or move to last
item of menu.
3
Brightness If there is no any OSD,Direct access to Brightness.
Increase + adjusting OSD, it will increase current value of bar, or move to next
item of menu.
4
Menu
/Enter/OK
Active main menu while no OSD display,enter next level on
main menu or sub menu status, or enter last level on
adjustment bar.Continued pressing 10 seconds will lock
menu or un-lock menu.
5 Power Button Power ON/OFF,and power indicator(Green and Amber).
2.3 OSD User mode adjustment
a) OSD Menu adjustment steps:

LenovoServiceManual L2021W
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LenovoServiceManual L2021W
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LenovoServiceManual L2021W
10

LenovoServiceManual L2021W
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3.Interface description
3.1 VGA Interface description
Pin No. Description Pin No. Description
1. Red Input 9. +5VDC
2. Green Input 10. GND
3. Blue Input 11. GND
4. GND 12. SDA- DDC-Serial Data
5. Connection detect 13. H Sync
6. Red GND 14. V Sync
7. Green GND 15. SCL- DDC-Serial Clock
8. Blue GND
VGA Connector layout
15
610
11 15
3.2 DVI Interface description
Pin No. Description Pin No. Description
1. TMDS Data 2- 13. TMDS Data 3+
2. TMDS Data 2+ 14. +5V Power
3. TMDS Data 2/4 Shied 15. To detect signal cable connected
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
8. Analog Vertical Sync 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-
DVI Connector layout

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4. Panel Feature
The Panel is a LTM200LT03-20.0 inch wide color TFT-LCD module . this module supports 1600×900 mode and
displays up to 16.7 millions colors.This model is composed of a TFT LCD panel,a driver circuit and a back light unit
（2CCFLs）.
4.1 General Specifications
4.2Absolute Maximum Ratings

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4.3 Electrical Characteristics
a) TFT LCD module
b) Backlight unit

LenovoServiceManual L2021W
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4.4 Panel Block Diagroam
4.5 LVDS Connector pinAssignment

LenovoServiceManual L2021W
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5.Block Diagram
5.1 LCD Block Diagram
5.2 MainBoard Block Diagram
Main Board Block Diagram Crystal24MHz
(X401)
LCD PANEL
(CN601/CN602)
RTD2122
(Include ADC, OSD, MCU)
(U401)
FLASH ROM
M24C16
(U403)/NC
Key Board Control
(CN402)
D-Sub
Connector
(CN301)
DVI
Connector
(CN302)
SDA
SCL
H sync
V sync
DVI_SDA
DVI_SCL
DB15_SDA
DB15
_
SCL
Scalar IC RTD2525
Signal access
U501
Voltage converter
5V
5V 3.3V 1.8V
DC-AC inverter
AC-DC
(5V/12V)
Power Board
Main Board
Key board Computer VGA
Computer DVI
2-CCFL backlight
Panel LVDS
AC supply
90V-264V
LCD Block Diagram
Input signal

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5.3 Power/ Inverter Board Block Diagram
Fuse EMI Rectifier Smoothing
Capacitor
C907
Transformer
T901
MOS
Q901
IC-PWM
IC901
12V
Rectifie
r
5V
Rectifie
r
12V
5V
Sense
resisto
r
Vcc
Rectifie
r
regulating
Sampling
PhotoCoupler
Vcc
Open Lamp Protection
12V DC
IC Power Supply
Converter
DC-AC
Transformer
T801
High Voltage
Output
Resonance NET
Switching MOS
Q802-AM9945
AC input
100-240V
2- CCFL
PWM Control IC
IC801-TL494
Current Sampling
Power part
Inverter part

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5.4 Software Flow Chart
------Just for your reference.
Start
Initial_MCU
Check if DataBuffer Is blank
Check if Sum is chan
g
ed ?
To Write default values
Read parameter_from Buffer
PowerHandler
Init_GlobalVariables
Initial_MCU Device
while
InputTiming
ModeHandler
MenuHandler
DebugHandler
if standby mode?
Brightness
Contrast
Language
InputType InputTimingStableCounter
OsdCounter
PowerDownCounter
LED turn-on
Show power on logo
if factory mode?
No signal message
UnsupportModeFlag
END
OSD Menu
Software Flow Chart
InputTiming
Phaes/Frequency
Image setup
Color
Oi
Enter factory mode OSD
Y
N
Y

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6. Circuit Schematic
6.1 Main Board---715G3327-1
input part---VGA/DVI/DDC
RX1N
ESD_VCC
RTD_G+
DSUB_5V
DVII_DETECT {4}
DDC1_SCL
U106
AZC 199-04S
1
2
3 4
5
6
I/O1
GND
I/O2 I/O3
VDD
I/O4
R329 100R 1/10W 5%
ESD_VCC
C308
5pF/ 50V
RTD_R+ {5}
R316 10K 1/16W
R325 10R 1/16W
ESD_VC C
C121
0.1uF /16V
R315 100R 1/16W
R441100R 1/ 10W 5%
R331
200R 1/10W 5%
R301 100R 1/16W
C303
33pF
CBPCRRHBFQ1 1.2
BenQ G920HD B
36
Monday , March 30, 2009
715G3327-1 <
称爹 >
3.INPUT
G3327-1-X-X-1-081127
OEM MOD EL 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
RTD_B+ {5}
DDC1-SDA
R326
100K 1/16W 5%
ZD 304
RLZ5.6B
1 2
VGA_B-
ESD_VC C1
C311
0.047uF
RTD_R-
RX2P
RTD_V {5}
V_Sy nc
C305
5pF/ 50V
R311
100R 1/16W DSUB_CONNECT {4}
R323 10R 1/16W
RX0P {5}
RTD_R- {5}
C304
0.047uF
VGA_G+
VGA_G-
R309 100R 1/16W
DDC1_SDA{4}
RXCP
C309
0.047uF
DGND
CN 302
JACK
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
26 25
DAT2-
DAT2+
2/4s hield
DAT4-
DAT4+
DDC SCL
DDC SDA
VSYNC
DAT1-
DAT1+
1/3s hield
DAT3-
DAT3+
+5V
SYNC GND
HPD
DAT0-
DAT0+
0/5s hield
DAT5-
DAT5+
clk shield
clk+
clk-
GND GND
Q301
MMBT3904
C306
0.047uF
R307
75R 1/10W 5%
VGA_CON
DSUB_H
C414
0.1uF/16V
R317 100R 1/16W
RX0P
R319 10R 1/16W
RTD_H {5}
VGA_R+
VGA_B+
HPD_CTL
DDC2_SCL
CN 301
DB15
1
6
2
7
3
8
4
9
5
11
12
13
14
15
10
17 16
FB302
19R BEAD
1 2
C310
5pF/ 50V
FB301
19R BEAD
1 2
D109
BAT54C
3
1 2
DSUB_V
H_Sy nc
R428 22R 1/10W 5%
U107
AZC199-04S
1
2
3 4
5
6
I/O1
GND
I/O2 I/O3
VDD
I/O4
R318 10R 1/16W
RX1P {5}
R322 10R 1/16W
RXCP {5}
C301
0.047uF
VGA_G+
VGA_B-
R324 10R 1/16W
H_Sy nc
R320 10R 1/16W
2007-02-06 add for EMI
RTD_G-
RX2N
VGA_R+
RTD_B+
R306 100R 1/16W
RX1P
ESD_VC C1
MCU_VCC_S
C316
0.1uF/16V
VGA_B+
R304
2K2 1/16W
DDC1_SCL{4}
RX1N {5}
VGA_B+
R312 100R 1/16W
VGA_G-
HOT_PLUG
06' 11/23 del R328-R329
R321 10R 1/16W
R305
2K2 1/16W
DDC2_SDA {4}
RX2N {5}
DDC2_SDA
C307
0.047uF
ESD_VCC1
U103
AZC 199-04S
1
2
3 4
5
6
I/O1
GND
I/O2 I/O3
VDD
I/O4
R426 22R 1/10W 5%
VGA_R-
ZD306
NC
1 2
FB109
300 OHM
FB108
300 OHM
DDC1_SDA
R313 100R 1/16W
FB303
19R BEAD
1 2
U104
AZC199-04S
1
2
3 4
5
6
I/O1
GND
I/O2 I/O3
VDD
I/O4
C101
0.1uF/16V
GND POWER
R308 100R 1/16W
R303 100R 1/16W
R330 200R 1/10W 5%
候綼 U103
DSU B_5V
ESD_VCC2
RTD_B- {5}
RX2P {5}
V_Sy nc
U105
AZC199-04S
1
2
3 4
5
6
I/O1
GND
I/O2 I/O3
VDD
I/O4
ESD_VCC2
DDC2_SCL {4}
RTD_R+
R332
200R 1/10W 5%
VGA_R+
DVI _5V
DSUB_V {4}
RTD_B-
VGA_R-
FB304
150 OHM
RXCN {5}
C120
0.1uF/16V
C302
33pF
RX0N
R314
75R 1/10W 5%
DDC1-SCL
R327
4K7 1/16W
R310
75R 1/10W 5%
RXCN
VGA_G+
ZD305
RLZ5.6B
1 2
R328 100R 1/10W 5%
RTD_G- {5}
RTD_G+ {5}
RX0N {5}
C415
0.1uF/16V
C112
0.1uF/16V
R440100R 1/ 10W 5%
C119
0.1uF/16V
Power part---5V/3.3V/1.8V

LenovoServiceManual L2021W
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VCC3
C_PANEL_INDEX
R202
4K7 1/16W
C206
0.1uF /16V
Near to Connect
CMVCC
+ C203
PANEL_ID# {4}
POWER _KEY # {4}
LED_G
Q202
MMBT3904
* BKLT-EN High ON(3.3V)
MVC C
FB201
120Ω
CN202
CONN
1
2
3
4
5
6
Back light
Dimming(0.5V~3V)
R213 10K 1/16W
'07-01-10 change to Elite
Mut e
'06-12-29-3 Change R207,R208 Value
from 470ohm to 120ohm
LED_R # {4}
R207
120R 1/16W
R201
200Ω1/16W
CMVCC
Volume# {4}
KEY1 {4}
CMVCC
C204
0.1uF /16V
LED_G
CN 201
CONN
1
2
3
4
5
6
7
8
9
CBPCRRHBFQ1 1.2
BenQ G920HD B
26
Monday , March 30, 2009
715G3327-1 <
称爹 >
2.POW ER
G3327-1-X-X-1-081127
OEM MODEL Size
Rev
Date Sheet of
TPV MODEL
PCB N AME
称爹
T P V ( Top Victory Electronics Co . , Ltd. )
Key Component
絬 隔 瓜 絪 腹
C210
0.1uF /16V
POWER _KEY #
R208
120R 1/16W
Mut e {4}
BKLT-EN
ZD201
NC/UDZSNP5.6B
1 2
'07-01-10 change to Elite
BKLT-VBRI
C205
0.1uF /16V
KEY0 {4}
Q205
MMBT3906
1
23
Q204
MMBT3906
1
23
R210 10K 1/16W
+ C202
U201
AP1117E33LA
1
23
VSS
VOUTVIN
C201
0.1uF /16V
KEY1
VCC3
INV_ON# {4}
CMVCC
BKLT-EN
ZD202
NC/UDZSNP5.6B
1 2
ZD203
NC/UDZSNP5.6B
1 2
LED_R
C209
0.1uF /16V
Volume#
Panel ID(0.5V~3V)
DIM# {4}
FB202
NC/120OHM
KEY0
LED_R
LED_G# {4}
VCC3
'06-11-3 Remove R209(470 ohm)
MCU-RTD2122L/MCU_Vcc/DDC

LenovoServiceManual L2021W
20
MCU_VCC
1
WP
X4 0 1
24mhz
1 2
C409
NC /10pF
R403
3.9KΩ1/ 16W
C411
10pF
2006-12-8 change R437,R401 from 10K to 3.9K
C403
0.1uF/ 16V
LED_R#{2}
R409 NC
2007-1/3 change ref from Y401
to X401
R431
6K8 1/16W
Volume#
'06-11-03
DVI I_DETECT{3}
DSUB_V {3}
MCU_VCC_S
C406
0.1uF/ 16V
+
C405
10UF50V
R432 100R 1/16W
PANEL_VCC
'06-11-03
R445 4K7 1/16W
MCU_VCC
R425
10K 1/16W
R437
3.9K OHM +-1% 1/16W
DSUB_V
R410 NC
D402
BAV70
C412
1uF 10V
MCU_VCC_S
KEY0 {2}
KEY0
KEY1
U402
AZ431AN-AE1
RTD_SD3/SDI {5}
R439
6K8 1/16W
Q401
MMBT390 4
RTD_SCLK {5}
PANEL_ID#
WP
R411
4K7 1/16W
R4134K7 1/16W
2007-02-06 add for EMI
'06-11-24 D402 change
Value from BAT54 to
BAV70
DVI_5V
R406
NC /4K7 1/16W 5%
MCU_VCC
'07-01-10
change to
Elite
LED_G#
R427 NC/1K 1/16W 5%
IICSCL
RTD2122L
U401 RTD2122L-LF
1
2
3
4
5
6 7
8
17 15
41 40 39 38 37 36 35 34 33
19
28
29
20
21
22
23
24
25
26
27
16
9
10
11
12
13
14
18
30
31
32
43 42
44
45
46
47
48
P5.5/PWM5
DSCL2/P5.6
DSDA2/P5.7
RST
ASCL1/ P3.0/R XD
NC NC
ASDA1/P3.1/TXD
VSS XO
VCC
P1.0/ T2
P1.1 P1.2 P1.3 P1.4 P1.5 P1.6 P1.7
NC
VSYNC
NC
P6.0/ADC0
P6.1/ADC1
P6.2/ADC2
P6.3/ADC3
P6.4
P6.5
P6.6/CLKO1
P6.7
XI
P3.2/INT0
P3.3/INT1
P3.4/T0
P3.5/T1
P7.6/CLKO2
P7.7
NC
NC
NC
NC
NC NC
P5.0/PWM0
P5.1/PWM1
P5.2/PWM2
P5.3/PWM3
P5.4/PWM4
DDC2_SCL
KEY1 {2}
INV_ON#{2}
C404
NC
2006-11/7 R423-R424 change from
100R to 1K
DSUB_V1
2
2007-1-15
change
from 4.7K
to 2.2K
VCC3
DSUB_CONNECT
CRYSTAR_OUT
'06-11-24
ADD D403
R423 NC
POWER _KEY #
R422 NC
R405
NC /4K7 1/16W 5%
CMVCC
C401
10pF
R420 NC
R444 4K7 1/16W
MCU_VCC_S
2007-01-11 ADD
DDC1_SDA{3}
C410
0.1uF/ 16V
PANEL_ID#{2}
Closed to MCU
IICSCL
R442 100R 1/16W
DSUB_5V
CRYSTAR_OUT {5}
POWER _KEY #
Volume#{2}
R401
3.9K OH M +-1% 1/16W
3
CBPCRRHBFQ1 1.2
BenQ G920HD B
46
Monday, March 30, 2009
715G3327-1 <
称爹 >
4.MCU/RTD2122L
G3327-1-X-X-1-081127
OE M MOD EL Size
Rev
Date Sheet of
TPV MODEL
PCB N AME
称爹
T P V ( Top Victory Electronics Co . , Ltd. )
Key Component
絬 隔 瓜 絪 腹
HPD_CTL
{3}
INV_ON#
2006-11/23 change R413-4,R443-R444
pull high pin from DSUB_VCC ,DVI_VCC
to MCU_VCC
07-01-10 change to 93G22-45-H
DDC1_SCL{3}
Mut e
IICSDA
R434 100R 1/16W
IICSDA
DIM#
2006-11/7 Add pull high R451 to MVCC
,R453,R454 pull up MCU_VCC
MVC C
MCU_VCC
Mut e{2}
DDC2_SDA
R453
1K 1/16W
DSUB_CONNECT {3}
POWER _KEY # {2}
DDC1_SDA
R408 NC
MCU_VCC_S
RTD_SCLK
MCU_VCC_S
DDC2_SDA
{3}
R424 1K 1/16W
C402
NC
CMVCC
D403
LL4148
R430 100R 1/16WPPWR_ON#
R433 100R 1/16W
DDC2_SCL{3}
BAT54C
R4144K7 1/16W
DIM#{2}
D401 is Reserve for
powerBoard CMVCC=3V
R443 4K7 1/16W
RTD_SD3/SDI
R404
10K 1/16W
MCU_VCC
R407
4K7 1/16W 5%
D401
NC
1
3
2
LED_R# R435 100R 1/ 16W
U403
NC/M24C16
1
2
3
4 5
6
7
8
NC
NC
NC
VSS SDA
SCL
WC
VCC
R454
NC
LED_G#{2}
R451
4K7 1/16W
R436
10K 1/16W
MCU_VCC
PPWR _ON#{6}
R438
3.9K OH M +-1% 1/16W
R415
6K8 1/16W
FB401
150 OHM
DDC1_SCL
R429 0R05 1/16W
R412
4K7 1/16W
2006-11-3 change R431 from 1K to 6.8K
Closed to X'tal
R416
10K 1/16W 5%
R402
1K 1/16W