IBM T860 9494-HWN User manual

COLOR MONITOR
SERVICE MANUAL
CAUTION
BEFORE SERVICING THE UNIT,
READ THE SAFETY PRECAUTIONS
IN THIS MANUAL.
MODEL: T860 (9494-HBN), (9494-HWN)
T860 (9494-HB0), (9494-HW0)

1. LCD CHARACTERISTICS
Type : TFT SXGA LCD
Size : 18inch(459.74mm)
Pixel Pitch : 0.2805(H) x 0.2805(V)
Color Depth : 8-bit, 16,777,216 colors
Electrical Interface : LVDS
Surface Treatment : Anti-Glare, Hard Coating (3H)
Operating Mode : Normally Black
Backlight Unit : Six-CCFL (Cold Cathode
Fluorescent Lamp)
2. OPTICAL CHARACTERISTICS
2-1. Viewing Angle by Contrast Ratio
≥ 10
Left : -60° min., -80°(Typ)
Right : +60° min., +80°(Typ)
Top : +60° min., +80°(Typ)
Bottom : -60° min., -80°(Typ)
2-2. Luminance : 200(min)
2-3. Contrast Ratio : 200(min)
3. SIGNAL (Refer to the Timing Chart)
3-1. Sync Signal
• Type : Separate, TTL, Positive/Negative
Composite, TTL, Positive/Negative
SOG (Sync On Green)
Digital
3-2. Video Input Signal
1) Type : R, G, B Analog
2) Voltage Level : 0~0.71 V
a) Color 0, 0 : 0 Vp-p
b) Color 7, 0 : 0.467 Vp-p
c) Color 15, 0 : 0.714 Vp-p
3) Input Impedance : 75 Ω
3-3. Operating Frequency
Horizontal : 30 ~ 80kHz
Vertical : 56 ~ 85Hz
4. POWER SUPPLY
4-1. Power Adaptor(Built-in Power)
Input : AC 100~240V, 60/50 ±3Hz , 1.0A
4-2. Power Consumption
5. ENVIRONMENT
5-1. Operating Temperature: 10°C~35°C (50°F~95°F)
(Ambient)
5-2. Relative Humidity : 10%~80%
(Non-condensing)
5-3. MTBF : 50,000 Hours(Min)
6. DIMENSIONS
Without Tilt/Swivel
Width : 397.0 mm (15.63'')
Depth : 77.4 mm ( 3.04'')
Height : 330.5 mm (13.01'')
With Tilt/Swivel
Width : 397.0 mm (15.63'')
Depth : 259.0 mm (10.19'')
Height : 349.7 mm (13.7'')
7. WEIGHT
Without Stand : 5.7kg (12.57 lbs)
With Stand : 8.1kg (17.86 lbs)
CONTENTS
SPECIFICATIONS
- 2 -
SPECIFICATIONS ................................................... 2
PRECAUTIONS ....................................................... 3
TIMING CHART ....................................................... 4
OPERATING INSTRUCTIONS ................................ 5
WIRING DIAGRAM ................................................. 7
BLOCK DIAGRAM ................................................... 8
DESCRIPTION OF BLOCK DIAGRAM.....................9
ADJUSTMENT ...................................................... 12
TROUBLESHOOTING GUIDE .............................. 13
PRINTED CIRCUIT BOARD................................... 18
EXPLODED VIEW...................................................22
REPLACEMENT PARTS LIST ...............................24
PIN CONFIGURATION............................................29
SCHEMATIC DIAGRAM......................................... 35
MODE
POWER ON (NORMAL)
STAND-BY
SUSPEND
OFF
POWER OFF
H/V SYNC
ON/ON
OFF/ON
ON/OFF
OFF/OFF
-
POWER CONSUMPTION
less than 55 W
less than 3 W
less than 3 W
less than 3 W
less than 3 W
LED COLOR
GREEN
AMBER
AMBER
AMBER
OFF
VIDEO
ACTIVE
OFF
OFF
OFF
-
H
D
W
H
D
W

- 3 -
WARNING FOR THE SAFETY-RELATED COMPONENT.
• There are some special components used in LCD
monitor that are important for safety. These parts are
marked on the schematic diagram and the
replacement parts list. It is essential that these critical
parts should be replaced with the manufacturer’s
specified parts to prevent electric shock, fire or other
hazard.
• Do not modify original design without obtaining written
permission from IBM or you will void the original parts
and labor guarantee.
TAKE CARE DURING HANDLING THE LCD MODULE
WITH BACKLIGHT UNIT.
• Must mount the module using mounting holes arranged
in four corners.
• Do not press on the panel, edge of the frame strongly
or electric shock as this will result in damage to the
screen.
• Do not scratch or press on the panel with any sharp
objects, such as pencil or pen as this may result in
damage to the panel.
• Protect the module from the ESD as it may damage the
electronic circuit (C-MOS).
• Make certain that treatment person’s body are
grounded through wrist band.
• Do not leave the module in high temperature and in
areas of high humidity for a long time.
• The module not be exposed to the direct sunlight.
• Avoid contact with water as it may a short circuit within
the module.
• If the surface of panel become dirty, please wipe it off
with a softmaterial. (Cleaning with a dirty or rough cloth
may damage the panel.)
WARNING
BE CAREFUL ELECTRIC SHOCK !
• If you want to replace with the new backlight (CCFL) or
inverter circuit, must disconnect the AC adapter
because high voltage appears at inverter circuit about
650Vrms.
• Handle with care wires or connectors of the inverter
circuit. If the wires are pressed cause short and may
burn or take fire.
PRECAUTION
CAUTION
Please use only a plastic screwdriver to protect yourself
from shock hazard during service operation.

TIMING CHART
- 4 -
VIDEO
SYNC
B
D
CFE
A
<< Dot Clock (MHz), Horizontal Frequency (kHz), Vertical Frequency (Hz), Horizontal etc... (µs), Vertical etc... (ms) >>
H – 37.5 840 640 16 64 120
V – 75 500 480 1 3 16
H – 43.269 832 640 56 56 80
V – 85.0 509 480 1 3 25
H – 31.469 840 640 16 96 48
V – 59.94 525 480 10 2 33
H – 31.468 900 720 18 108 54
V + 70.8 449 400 12 2 35
H + 31.469 800 640 16 96 48
V – 70.8 449 350 38 2 59
H + 37.879 1056 800 40 128 88
V + 60.317 628 600 1 4 23
H + 46.875 1056 800 16 80 160
V + 75.0 625 600 1 3 21
H + 53.674 1048 800 32 64 152
V + 85.061 631 600 1 3 27
H +/– 49.725 1152 832 32 64 224
V +/– 74.55 667 624 1 3 39
H – 48.363 1344 1024 24 136 160
V – 60.0 806 768 3 6 29
H – 60.123 1312 1024 16 96 176
V – 75.029 800 768 1 3 28
H + 68.677 1376 1024 48 96 208
V + 84.997 808 768 1 3 36
H +/– 68.681 1456 1152 32 128 144
V +/– 75.062 915 870 3 3 39
H +/– 61.805 1504 1125 18 134 200
V +/– 65.96 937 900 2 4 31
H + 63.981 1688 1280 48 112 248
V + 60.02 1066 1024 1 3 38
H + 79.976 1688 1280 16 144 248
V + 75.035 1066 1024 1 3 38
Mode H/V
Sort
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
25.175
31.5
36.0
25.175
28.321
40.0
49.5
56.25
57.283
65.0
78.75
94.5
100.0
92.978
108.0
135.0
640x480
75Hz
640x480
85Hz
640x480
60Hz
720x400
70Hz
640x350
70Hz
800x600
60Hz
800x600
75Hz
800x600
85Hz
832x624
75Hz
1024x768
60Hz
1024x768
75Hz
1024x768
85Hz
1152x870
75Hz
1152x900
65Hz
1280x1024
60Hz
1280x1024
75Hz
Sync
Polarity Frequency
Dot
Clock Total Period
(E)
Video Active Time
(A)
Sync Duration
(D)
Back Porch
(F)
Front Porch
(C)
Resolution

OPERATING INSTRUCTIONS
- 5 -
FRONT VIEW REAR VIEW
Front Control Panel
Front Control Panel
Power Connect
Power ON/OFF
Switch
AUDIO DC OUT
D-sub Siganl Port
DVI Port
321
4
5
1. Power Indicator
This indicator lights up green when the monitor
operates normally; In DPMS (Energy Saving) mode,
-stand-by, suspend, or power off mode -its color
changes to orange.
2. Power ON/OFF Button
Switches the monitors on and off.
3. ENTER Button
1) Displays main OSD menu.
2) Enters highlighted menus and submenus.
3) Selects highlighted option.
4. Arrow Key
Moves the cursor to highlight icons or make adjustments.
1) Brings up Contrast control OSD.
2) Left and Right arrows pressed together bring up auto
setup.
5. Exit Button
OSD on
1) Exits from menus, sub menus.
2) Exits from OSD.
OSD off
1) Change the input signals(DVI-I↔D-Sub).

- 6 -
On-Screen-Display (OSD) Control
The settings adjustable with the user controls are viewed through the On -Screen Display (OSD). Press the enter
button [ ] to display the main OSD menu.
Initial appearance of OSD
Image Set-Up: The IMAGE SET-UP function
is used to adjust the level of noise in the video
signal which causes horizontal lines or areas
on the screen where the image appears to be
unstable and jitters or shimmers. This can be
done automatically or manually.
If manual is selected, the user will go to the
manual adjustment screen.
Color: Select the Color Mode you find most
comfortable and then fine tune the colors using
the User Color Mode menu, if necessary.
Brightness: To adjust the screen brightness level.
Contrast: To adjust the image contrast level.
Icon Description
Listed below are icons, icon names.
OSD Position: Changes the position of the
OSD on the screen.
Reset: Reset should return all available
functions (apart from language which should not
change unless adjusted via the LANGUAGE
menu) for their factory presets.
Icon Description
H-Position: Moves the screen left and right.
V-Position: Moves the screen left and right.
Image Size: This function displays the image in
its original size or enlarged size so as to fit in
the full screen of the LCD panel.
Language: The language chosen affects only
the language of the OSD.
Select one of the five language to use for the
OSD. It has no effect on any software running
on the computer.
Information: The model name, serial number,
year of manuracture and current display mode
should be included in the Information screen.
To inform users of the current mode the
monitor is using, and also shows the preset
and user modes stored in the monitor. The
current display mode be shown at the base
of the preset mode and user mode displays.
Use the left and rigth buttons to see the preset
modes and user modes screens.
MAIN MENU
DVI-DIGITAL INPUT
BRIGHTNESS
MAIN MENU
DSUB-ANALOG INPUT
BRIGHTNESS
BRIGHTNESS
75
Sub Menu;
When the Digital Signal input When the Analog Signal input
INPUT SELECT: Use this button to make the
analog or digital connector active. This feature
is used when two computers are connected to
the monitor. The default setting is analog.

MODULE
MAIN PCB
REAR SHIELD
MATAL FRAME
MATAL FRAME
J702
J801J705 P902 P903
J710
CN1
CN4
CN5
CN6
CN7
CN8
CN9
CN_C01 CN301
CN_C02
- 7 -
WIRING DIAGRAM
Connector Ass’y P/N: 6631T11012P
Connector Ass’y P/N: 6631T25005E

- 8 -
D-SUB DVI-I
Gm5020
including
(ADC / TMDS Rx )
LVDS
(THC63LVD823)
Memory
(KM416S102BT)
H-Sync A
V-Sync A
Micom
68HC08-BD48
M-CLK
Out - CLK
DE ,H/V Sync out
R,G,B Even/Odd
LCD Module
R,G,B differential LVDS:Low Voltage Differential Signaling
Data 48Bit
Address
Inverte r CTL
Module CTL
R,G,B
Inverter
Digital Signal
3.3V
Reg.
DVDD 3.3V AVDD 3.3V
12V
Power CTL
V-Sync
5V
2.5V
Reg.
DVDD2.5V AVDD2.5V
3.3V
Reg.
PVDD 3.3V
3.3VM
5V 5V
DVI-Analog Signal
R,G,B
H-Sync B
V-Sync B
BA7657
(Video Switch)
R,G,B
5V
H/V-Sync
Hsync
Switch
(A or B)
H-Sync A
H-Sync
H-Sync B
3.3VM
Power Board
12V
5V
BLOCK DIAGRAM

- 9 -
DESCRIPTION OF BLOCK DIAGRAM
1. Input signal switching part(BA7657).
There are two anolog inputs which are D-Sub analog and DVI-anolog input.
They come from each 15 pin D-Sub and 29 pin DVI-I connector.
2. Video Controller Part(GM5020).
This part amplifies the level of video signal for the anolog to digital conversion and converts from the analog video
signal to the digital video signal using a pixelclock.
The pixel clock for each mode is generated by the PLL.
The range of the pixel clock is from 25MHz to 135MHz.
This part consists of the Scaler and frame buffers which converts frame rate of input signal to 60Hz frame rate.
The Scaler gets the video signal converted analog to digital, interpolates input to1280 X 1024 resolution signal and
outputs 8-bit R, G, B signal to transmitter.
Especially pre-amp / ADC / Video controller are merged to one chip ‘Gm5020’by Genesis.
Also FRC is separate.
3. Display Data Transmitter Part(LVDS).
This part transmit digital signal from the Scaler to the receiver of module.
4. Power Part.
This part consists of the one 5V, two 3.3V and one 2.5 regulators to convert power which is provided 12V, 5V in
Power Board.
12V is provided for inverter, 5V is provided for Micom and LCD Panel.
Also, 5V is converted 3.3V and 2.5V by regulator. Converted power is provided for IC in the main board.
5. MICOM Part.
This part consists of EEPROM IC which stores control data, Reset IC and the Micom.
The Micom distinguishes polarity and frequency of the H/V sync are supplied from signal cable.
The controlled data of each modes is stored in EEPROM.
6. Inverter
The inverter converts from DC12V to AC 700Vrms and operate back-light lamp of module.

- 10 -
EMI
COMPONENTS
LINE
100 ~ 240V
INPUT RECTIFIER
AND FILTER ENERGY
TRANSFER OUTPUT RECTIFIER
AND FILTER
12V
5V
GND
SIGNAL
COLLENTION
PHOTO-COUPLER
ISOLATION
PWM CONTROL
CIRCUIT
HVDC 100KHz
PRIMARY SECONDARY
50 ~ 60Hz

- 11 -
Operation description_Power
1. EMI components.
This part contains of EMI components to comply with global marketing EMI standards like FCC, VCCI CISPR,
the circuit included a line-filter, across line capacitor and of course the primary protection fuse.
2. Input rectifier and filter.
This part function is for transfer the input AC voltage to a DC voltage through a bridge rectifier and a bulk capacitor.
3. Energy Transfer.
This part function is transfer the primary energy to secondary through a power transformer.
4. Output rectifier and filter.
This part function is to make a pulse width modulation control and to provide the driver signal to power switch, to
adjust the duty cycle during different AC input and output loading condition to achive the dc output stablize, and also
the over power protection is also monitor by this part.
5. Photo-Coupler isolation.
This part function is to feed back the dc output changing status through a photo transistor to primary controller to
achive the stablized dc output voltage.
6. Signal collection.
This part function is to collect the any change from the dc output and feed back to the primary through photo
transistor

- 12 -
ADJUSTMENT
All adjustment are thoroughly checked and corrected
when the monitor leaves the factory, but sometimes
several minor adjustment may be required.
Adjustment should be following procedure and after
warming up for a minimum of 10 minutes.
•Alignment appliances and tools.
- IBM compatible PC
- Programmable Signal Generator.
(eg. VG-819 made by Astrodesign Co.)
- E(E)PROM with each mode data saved.
1. Adjustment Start
1) Display any pattern at any Mode.
2) Run alignment program for LI884E on the IBM
compatible PC.
3) Select EEPROM →ALL INIT command and Enter
4) This will make all data to default state
5) Select COMMAND →PRESET START command
and Enter
2. Adjustment for Factory Preset Mode
1) Select DIST. ADJ →FOS DEFAULT command
and Enter
2) It will copy all factory default data to EEPROM
automatically.
3. Adjustment for White Balance
1) Display color 0,0 pattern at Mode 15.
2) Set External Bright to MAX position and Contrast to
MAX Position.
3) Select PRESET START → BIAS CAL command
and Enter.
4) No attempt to manually adjust, BIAS data is auto-
matically adjusted and saved to the EEPROM.
5) Display color 15,0 pattern at Mode 15.
6) Select DRIVE CAL command and Enter.
7) 7200K and 9300K are automatically adjusted and
saved to the EEPROM.
8) Select PRESET EXIT command and Enter.
4. Adjustment for EDID
1) Use this procedure only when there is some
probelm on EDID data.
2) Connect the D-sub cable.
3) Select EEPROM →EDID Write command and
Enter.
4) Select DDC(A) Write command and Enter.
5) Connect the DVI-I cable.
6) Select DDC(D) Write command and Enter.
220
IBM
Compatible PC
PARALLEL PORT
Power inlet (required)
Power LED
ST Switch
Power Select Switch
(110V/220V)
Control Line
Not used
RS232C
PARALLEL
V-SYNC POWER
ST
VGS MONITOR
E
E
V-Sync On/Off Switch
(Switch must be ON.)
F
F
A
A
B
B
C
C
1510
5
569
1
1
1
14
13
25
6
5V
5V
5V
4.7K
4.7K
4.7K
74LS06
74LS06
OFF ON
OFF
ON
11
Figure 1. Cable Connection

TROUBLESHOOTING GUIDE
- 13 -
1. NO POWER
TROUBLE IN
BULT-IN POWER
CHECK J801
5VST VOLTAGE
(5V) ?
NO
NO POWER
(POWER INDICATOR OFF)
TROUBLE
SOMEWHERE ELSE
TROUBLE IN
BULT-IN POWER
CHECK J801
INPUT VOLTAGE
(12V) ?
NO
TROUBLE IN
U501 or X501
NO
YES
YES
YES
CHECK
U501’s PIN 6.
IS THIS PIN
OSCILLATED?

- 14 -
2. NO RASTER
TROUBLE IN
INVON PATTERN
CHECK
J702 PIN 8 (5V) ? NO
NO RASTER
TROUBLE IN
POWER ADATER
or L703, L704
CHECK
J702 PIN 1, 2, 3
(12V) ?
NO
TROUBLE IN
X501
CHECK
X501
H. PULSE ?
NO
TROUBLE IN
U201
CHECK
U201(GM5020) ? NO
TROUBLE IN
U201
NO
TROUBLE IN
U201
CHECK
U301, U302, U303
PIN 35
MEMORYCLK?
NO
YES
YES
YES
YES
YES
CHECK
L201, L202, L203
PULSE?

- 15 -
CHECK DOT CLOCK
PATTERN
NO
TROUBLE IN
U201
NO
CHECK
DVS PATTERN
NO
CHECK
DHS PATTERN
NO
YES
YES
YES
YES
YES
TROUBLE IN
LCD MODULE
CHECK
U401 PIN 8
V.PULSE?
CHECK
U401 PIN 7
V.PULSE?
CHECK
U401 PIN 10
PULSE ?
CHECK
L204
PULSE ?

- 16 -
3. NO CLOCK (CLOCK GENERATOR)
NO DOT CLOCK
TROUBLE IN
X201
CHECK
X201 24MHz ? NO
TROUBLE IN
U201
CHECK
L201
CLOCK ?
NO
YES
YES

- 17 -
4. TROUBLE IN DPM
TROUBLE IN DPM
TROUBLE IN PC
CHECK PC
PC IS NOT GOING
INTO DPM OFF MODE
NO
TROUBLE IN
X501
NO
TROUBLE IN
SIGNAL CABLE
NO
YES
YES
YES
CHECK
U501 PIN 6
WAVEFORM
(24MHz) ?
CHECK
R233, R234?
CHECK
U501 PIN 11
(0V) ?

PRINTED CIRCUIT BOARD
- 18 -
1. MAIN BOARD (Component Side)
ZD721
U301
C301
U302
C302
U303
C318
Q703
R730
R740 R741
ZD722
J705
1
C526
30
1
J706
20
30
30
20
20
C533
Q704
U504
C729
R731
R744
U507
R742 R743
J710
50
4030
C408
L401
10
10
10
RA238
RA239
C547
60
U401
20
50
R236
RA225
1
50
50
1
1
RA237
RA240
RA242 RA241
R587
R588
R591
R585
R586
R572
R573
C546
J802
R570
R571
70
10
1
L403
CA201
RA226 RA227 RA228 RA229 RA230 RA231 RA232 RA233 RA234 RA235 RA236
Q501
R592
U508
D502 D501
C817
C409
80
C410
90100
C413
CA202
RA216 RA214
V
W
Y
L206
C229
R218
D503
D504
C532
R574
R575
ZD711
ZD704 ZD703
U802
R810
L402
CA211 CA210 CA209 CA208 CA207
CA212CA203
RA220 RA218
N
P
R
T
U
M
L207
C230
R219
R593
R594
R597
X201
C115
R595
R596
C114
R705
R807
R809
R406
RA212
CA206
CA205 CA204
RA222RA224
C271
R235
L K
J
H
G
F
C548
C117
C118 C116
R704
C850
C844
U821
RA208RA210 RA206 RA204 RA202
20
U201
1918171615141312111098765432
C270
E D C B
A
1
C278 C279 R220
R221
C258
R223
R145 U509
C119 R703
C845
C834
R582 R545
C201
C202
C203
C206
C205
C204
C276 C280 R222
R224
C259
C260
C261
J704
L820
L810
C531
U503
C517
C516 R581
R542
R543
R544
R508 R510
MODEL:LB886F
DATE :2001.11.23
C822
P/N :6870T402A12
C828
L805
C825
C130
U109
L101
C128
C124
R225
U106
C109
C113
C111
R767
R766
C112
ZD705
C707
C840
R514
R515
C831
L804
R151
R153
R152
C125
C122
C108
R765
C110
C701
R517
R502
U502
U820
C160 C161
Q104
C727
R726
R129
R122
R149
R148
D738
D739
ZD702 D716
L821
L811
R702
C706
R701
R520
C502R501
X501
U803
C870
C871
C841
R822
U107
U110
C106
Q102
C107
R727R131
R130
Q103
D734 D736
ZD701
C728
D735 D737
J801
J702
R745
R746
C522
C501
C503
C872
U804
C843
R821
R824
U105
U108
R133
R132
D733
C521
U501
C873 C842 D732
J708

- 19 -
2. MAIN BOARD (Solder Side)
R732
C738
C730 C731
C307
C303
R206
R207
R205 R203
R210
C403
C402
C308 C314
C311
C306
C310C316
C309
C313 C305
C312 C304
R214
R215
R204 R216
C406
C404
C401
R404
R403
R402
R401
R405
C317
C315
R213
R209 R211 R212
C407
C405
R208
C820
C207
C209
R232
L205
C263
R237 R238
L823
C819
C860
L822
C411
C412
C221
C216 C215 C213
C214
C212
C211
C210 C219
C208
R233 R234
C262
D704
R711
C818
R825
C835 C836
C232
L201 L202 C220 C231
C234 C225 C224 C217
R201
C222 C223
C265 C218
C226 C227
C240
C239 C264
D702D703
R712 C715
C714
C236
L203
L204
C235
C233
C237
R202
C228
C275
C269
C273
R240
D701
R150
D731
R714
R715
C514
R511
R524
C515
C257
C238
C272 C274
R139
R137 R138
R239
R140 R141 R142
R147
R760
R769
R716
D730
R713
C504
C505
R512 R513
R527
R526
R525
C507
C506
C823
C829
C827
C131
R135
C120
D715
D712
R535 R539
R536 R538
R537
R564 C519
R505
C508
R531
R580
C832
C824
C830
C826
R154
R155
R146
D714
R729
R534
C520
R518
R516
C513
C833
R827 R831
R815 R826
C123
D713
R761R768
R718
R719
R728C742
C710
L703
L704
R522
R519
R541
C511
C510
C530
R817 R818 R816
R811 R814
R813 R812
U702
U701
R750
R751
C741
C740
R523
R540
R529
R528
R830 R819
R820
R829 R828
C861
R136
C121
R134
R752
R754
R753
20
30
10
40
1

- 20 -
3. POWER B OARD (Component Side)
4. POWER B OARD (Solder Side)