IBM 6656HG2 - T 560 - 15" LCD Monitor User manual

COLOR MONITOR
SERVICE MANUAL
CAUTION
BEFORE SERVICING THE UNIT,
READ THE SAFETY PRECAUTIONS
IN THIS MANUAL.
MODEL: T560 (6656-HW2)
T560 (6656-HG2)

SPECIFICATIONS
- 2 -
1. LCD CHARACTERISTICS
Type : TFT XGA LCD
Size : 15 inch (38.35cm)
Pixel Pitch : 0.297mm(H) x 0.297mm(V)
Pixel Format : 1024 x 768 pixels (XGA)
RGB Stripe Arrangement
Color Depth : 6-bit with FRC/16M color
Active Video Area : 304.128mm x 228.096mm
Surface Treatment : Anti-Glare, Hard Coating (3H)
Backlight Unit : CCFL (Cold Cathode
Fluorescent Lamp)
2. OPTICAL CHARACTERISTICS
2-1. Viewing Angle by Contrast Ratio
≥ 10
Left : 60° typ., 55° min.
Right : 60° typ., 55° min.
Top : 45° typ., 40° min.
Bottom : 45° typ., 40° min.
2-2. Luminance : 250 cd/m2typ.
2-3. Contrast Ratio : 300 : 1 typ.
3. SIGNAL (Refer to the Timing Chart)
3-1. Analog Video Input
1) Video Input Range : 0~0.7V ± 5%
2) Video Termination Impedance : 75Ω±5%
3) Sync Type : Separate TTL
4) Sync Level : TTL Low ≤0.8V, High ≥2.0V
3-2. Digital Video Input
DDWG DVI Standard 1.0
3-3. Operating Frequency
Horizontal : 31 ~ 61 kHz
Vertical : 56 ~ 75 Hz
4. POWER SUPPLY
4-1. Power Adaptor
Input : AC 90~264V, 50/60Hz 1.2A
Output : DC 12V 3A
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. Altitude : 0~10,000ft (3,657m)
6. DIMENSIONS (with TILT/SWIVEL)
1) Full Up Condition;
Width : 365.2 mm (14.38'')
Depth : 235 mm (9.25'')
Height : 435.8 mm (17.16'')
2) Folded Condition;
Width : 365.2 mm (14.38'')
Depth : 86.5 mm (3.41'')
Height : 305.6 mm (12.03'')
7. WEIGHT (with TILT/SWIVEL)
Net. Weight : 4.9 kg (10.80 lbs)
Gross Weight : 7.7 kg (16.975 lbs)
SPECIFICATIONS ................................................... 2
PRECAUTIONS ....................................................... 5
TIMING CHART ....................................................... 6
OPERATING INSTRUCTIONS .................................7
WIRING DIAGRAM ................................................. 8
DISASSEMBLY ....................................................... 9
BLOCK DIAGRAM ................................................. 11
DESCRIPTION OF BLOCK DIAGRAM.................. 12
ADJUSTMENT ...................................................... 13
TROUBLESHOOTING GUIDE .............................. 14
PRINTED CIRCUIT BOARD................................... 18
EXPLODED VIEW...................................................20
EXPLODED VIEW PARTS LIST..............................21
REPLACEMENT PARTS LIST ...............................23
PIN CONFIGURATION............................................27
SCHEMATIC DIAGRAM......................................... 28
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 30 W
less than 3 W
less than 3 W
less than 3 W
less than 3 W
LED COLOR
GREEN
AMBER
FLASHING AMBER
FLASHING AMBER
OFF
VIDEO
ACTIVE
OFF
OFF
OFF
-
W
H
D
W
D
H

- 3 -
Tilt Range : -37°~ 145°
You can tilt the screen backward and forward as shown below(Figure A).
Height Range
You can adjust height of the screen(Figure B).
Landscape & Portrait
This monitor offers the ability to rotate between landscape and portrait modes(Figure C).
The monitor rotates from Landscape to Portrait through 90°clockwise and from Portrait to
Landscape through 90°anti-clockwise.
Adjusting the Monitor Position
(Figure A)
-37 +145
(Figure B)
Maximum:
4.87 inch(123.8 mm)
Maximum:
3.863 inch(98.1mm)
(Figure C)

- 4 -
To obtain the correct cables and/or to get further instructions on installing them, call the IBM
HELPCENTER at the above numbers or contact your dealer, retailer, or other IBM authorized Servicer.
Alternative mounting options for your IBM Flat Panel Monitor may be available from specialist suppliers.
To attach the monitor to an arm or a surface of wall, please follow the instructions below:
1. Power off the monitor.
2. Fold the monitor arm in the order of Figure (A), (B) and (C) as shown above.
3. Place the monitor on a stable and shock-resistant floor, with the front of the monitor at the bottom.
4. Hold the metal clip and push it carefully until it clamps both of the stand and the arm firmly, as shown in
Figure (D) above. (The metal clip is used to keep the arm folded.)
5. You have to use the four screw holds on the bottom of the stand to attach the monitor to the surface of
wall. For additional information, see the instructions supplied with the purchased arm.
6. Locate a place to which you want to attach the monitor. When locating the place, you have to consider
the lengths of the signal cable and the power cord.
7. Attach the monitor to the place you selected in the step 6, and then reconnect the signal cable and the
power cord to the monitor.
(A) (B) (C)
( )
Metal clip
Screw holds
VESA Wall Mounting

- 5 -
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 Inc. 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
- 6 -
VIDEO
SYNC
B
D
CFE
A
H / V
H (Pixels)
V (Lines)
H (Pixels)
V (Lines)
H (Pixels)
V (Lines)
H (Pixels)
V (Lines)
H (Pixels)
V (Lines)
H (Pixels)
V (Lines)
H (Pixels)
V (Lines)
H (Pixels)
V (Lines)
H (Pixels)
V (Lines)
H (Pixels)
V (Lines)
H (Pixels)
V (Lines)
H (Pixels)
V (Lines)
H (Pixels)
V (Lines)
Sync
Polarity
+
–
–
+
–
–
–
–
–
–
+
+
+
+
+
+
+
+
–
–
–
–
–
–
+
+
Dot
Clock
25.175
28.322
25.175
30.24
31.5
36.0
40.0
50.0
49.5
57.2832
65
75
78.75
Frequency
31.468 KHz
70.0 Hz
31.468 KHz
70.0 Hz
31.469 KHz
60.0 Hz
35.00 KHz
66.67 Hz
37.50 KHz
75.0 Hz
35.156 KHz
56.25 Hz
37.879 KHz
60.3 Hz
48.077 KHz
72.188 Hz
46.875 KHz
75.0 Hz
49.725 KHz
74.55 Hz
48.363 KHz
60.0 Hz
56.476 KHz
70.0 Hz
60.023 KHz
75.0 Hz
Resolution
640 x 350
720 x 400
(TEXT)
640 x 480
640 x 480
640 x 480
800 x 600
800 x 600
800 x 600
800 x 600
832 x 624
(MAC)
1024 x 768
1024 x 768
1024 x 768
Total
Period
( E )
800
449
900
449
800
525
864
525
840
500
1024
625
1056
628
1040
666
1056
625
1152
667
1344
806
1328
806
1312
800
Video
Active
Time ( A )
640
350
720
400
640
480
640
480
640
480
800
600
800
600
800
600
800
600
832
624
1024
768
1024
768
1204
768
Blanking
Time
( B )
160
99
180
49
160
45
224
45
200
20
224
25
256
28
240
66
256
25
320
43
320
38
304
38
288
32
Sync
Duration
( D )
96
2
108
2
96
2
64
3
64
3
72
2
128
4
120
6
80
3
64
3
136
6
136
6
96
3
Back
Porch
( F )
48
60
55
34
48
33
96
39
120
16
128
22
88
23
64
23
160
21
224
39
160
29
144
29
176
28
Front
Porch
( C )
16
37
17
13
16
10
64
3
16
1
24
1
40
1
56
37
16
1
32
1
24
3
24
3
16
1
MODE
1
2
3
4
5
6
7
8
9
10
11
12
13

OPERATING INSTRUCTIONS
- 7 -
FRONT VIEW REAR VIEW
Front Control Panel
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
1) Exits from menus, sub menus.
2) Exits from OSD.
321
4
5
Front Control Panel
DVI Port DSub signal
Adapter Jack

WIRING DIAGRAM
- 8 -
P704 P703
J1
Inverter Cable :
6631T11012L
Module link Cable :
6631T11012M

Back Cover
- 9 -
DISASSEMBLY
(a)
(b)
(a)
(c)
1. TILT SWIVEL REMOVAL
(1) Remove the Cover Hinge.
(2) Remove two screws (a).
(3) Remove the Cover Piece Back.
(4) Remove two connectors (c).
(5) Remove the Module Link Cable connector.
(6) Remove the screw (b).
(7) Remove the Tilt Swivel.
2. BACK COVER REMOVAL
(1) Remove four Screw Covers (a).
(2) Remove four screws (b).
(3) Remove the Back Cover Ass’y.
(b)
(b)
(a)
(a)
(a)
(a)
(b)
(b)
3. CABINET ASS’Y REMOVAL
(1) Remove four Screws (a).
(2) Remove the Control PCB connerctor.
(3) Remove the Cabinet Ass’y.
(a)
(a)
(a)
(a)
Cover Hinge
Cover Piece Back
Module Link Cabel
Cabinet
Control PCB Connector

- 10 -
(a)
(b)
(c) (c)
(d)
(d)
(d)
(e) (e)
(d) (d)
6. TILT SWIVEL ASS’Y REMOVAL
(1) Remove the Cover Hnge (a).
(3) Remove the Cover Stand Body. (Change the Cable)
(2) Remove the Cover Stand Rear(b).
(4) Remove two screws(c).
(5) Remove the Cover Stand Top.
(6) Remove five screws (d) and Metal Shield Main.
(7) Remove two screwS (e).
4. LCD MODULE REMOVAL
(1) Remove Inverter Connector.
(2) Remove eight Screws (a).
(3) Remove the Metal Frame from the LCD MODULE.
(a)
(a)
(a)
(a)
(a)
(a)
(a)
(a)
Inverter Connector
5. INVERTER ASS’Y REMOVAL
(1) Disconnector the CN3, CN4.
(2) Remove the Inverter Ass’y.
Inverter Ass’y
Cover Stand Top
Cover Hinge
Remove the Cover Stand Body
Cover Stand Body
Metal Shield Main
LCD Module

- 11 -
BLOCK DIAGRAM

DESCRIPTION OF BLOCK DIAGRAM
- 12 -
1. Genesis Chip (Scaler chip)
GM5020 (U201) is one chip IC which it supports six function block of Video pre amp, PLL, A/D converter
OSD IC, TMDS receiver and scaler.
Video signal (0.7Vp.p) clamped through C204, 210, 211 inputs to U201. These R, G, and B analog signals
converted to 8bit digital signals through pre amp’s amplifying(1/0.7 time) to match AD converter’s operation
range from 0V to 1V and AD converter’s converting analog to 8 bit digital.
Internal PLL inputs horizontal sync signal and outputs clock to ADC and scaler for precise data catching.
Scaler inputs 8bit digital signals and clock, and carries out image processing that interpolates input signal
less than 1024*768 resolution to that of 1024*768 resolution, mixes OSD(On Screen Display) signal by
interfacing with internal OSD IC, and outputs clock, H/V sync, 24bit RGB data, and DE(data enable) signals
which Transmitter(U401) needs.
For supporting digital interface, this IC has internal TMDS receiver converting serial data signal to parallel.
And parallel signal almost similar as 24bit RGB data signal of AD converter’s output goes to scaler which
conducts same operation of analog interface flow that described before.
2. Panel-Link Circuit
Panel link transmitter (U401) delivers digital signal to the receiver inside LCD module by method of abstraction.
The abstracted signals are pairs of TX0+-, TX1+-, TX2+-, TXC+- of which voltage swing is 0.5V each.
Its swing is similar to LVDS (Low Voltage Differential Signal).
Transmitter (U401) gets signals of clock, H/V sync, 24bit RGB data, and DE(data enable) from U201, and outputs
TMDS (Transition Minimized Differential Signal) through TX pins.
When PD pin’s input is low, transmitter goes to power down mode.
3. System Controller (Microprocessor) Circuit
1) Microprocessor (U501) distinguishes polarity and frequency by calculating horizontal and vertical sync input
from signal source.
2) Microprocessor (U501) carries out power control by sending power-down trigger signal to U201, LCD module
and inverter for required power sequence and low power consumption.
3) Microprocessor (U501) communicates with EEPROM (U506), and GM5020 (U201) through IIC(2 lines) or
6 bit bus line. It makes all devices proper operating with communication channel.
4) Microprocessor (U4) lets User adjust screen by each OSD function.
4. DC/ DC Converter
This circuit supplies DC power for each device needing DC voltage of AVDD3.3V, DVDD3.3V, PVDD3.3V,
AVDD2.5V, DVDD2.5V, and 5VST.
L4973D5.1(U803) , the DC/DC controller IC converts input 12Vdc into +5Vdc and +3.3Vdc with peripheral circuit
composed of Coil (L805), condensing components (ZD801, C829, C830) and Regulators (U801, U821).
+3.3VMOD for LCD module power are switched by U802, switching FET, controlled by Microprocessor.

ADJUSTMENT
- 13 -
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
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.
- Alignment Adapter and Software.
1. Adjustment for Factory Preset Mode
1) Run alignment program for LI561G on the IBM
compatible PC.
2) Select EEPROM all clear command and Enter.
3) Display cross hatch pattern at Mode 1.
4) Select COMMAND PRESET START command.
5) Select FOS DEFAULT command and Enter.
6) Press "Y" key, it will automatically save all FOS data
to EEPROM.
2. Adjustment for White Balance
1) Display color 0,0 pattern at Mode 13.
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 13.
6) Select DRIVE CAL command and Enter.
7) Color 2 (7200K) and Color 3 (9300K) are
automatically adjusted and saved to the EEPROM.
8) Select PRESET EXIT command and Enter.
3. DDC Data Write Procedure
1) Use this procedure only when there is some
probelm on EDID data.
2) Select EEPROM →EDID Write command and
Enter.
3) This will write the EDID data to EEPROM.

- 14 -
TROUBLESHOOTING GUIDE
1. NO POWER
CHECK X501.
CHECK
X501’S WAVEFROM
OSCILLATE AS
24MHZ ?
NO
NO POWER
(POWER INDICATOR OFF)
CHECK ADAPTER,
AND FIND OUT
SHORT POINT OF
EACH DC LINE OF
2.5V AND 3.3V
CHECK J801’S
VOLTAGE
(12V) ?
NO
CHECK U803 AND
L805’S OPEN
CHECK
U803 PIN 2, 3
WAVEFROM?
NO
YES
YES
YES
CHECK KEY CONTROL
CONNECTOR ROUTINE
200kHz
40% duty
12V

- 15 -
2. NO RASTER (OSD IS NOT DISPLAYED) – INVERTER
CHECK MICOM INV
ON/OFF PORT.
J703 PIN5
5V? NO
NO RASTER
(OSD IS NOT DISPLAYED)
CHECK ADAPTER
J703 PIN10
12V? NO
1. CONFIRM BRIGHTNESS
OSD CONTRL STATE.
2. CHECK MICOM DIM-ADJ
PORT
J703 PIN1
5V? NO
REPLACE
INVERTER ASS’Y
CHECK
PULSE AS
CONTACTING SCOPE
PROBE TO CAUTION LABEL.
(CONTACT PROBE TO
CAUTION LABEL.
CAN YOU SEE PULSE
AT YOUR
SCOPE?
NO
REPLACE CCFL LAMP
IN THE LCD MODULE
YES
YES
YES
YES

CHECK U802, U881
NO
- 16 -
1. CHECK PIN34, 35
SOLDERING CONDITION
2. CHECK X201
3. TROUBLE IN U201
U821
POWER PINS
3.3V, 2.5V?
NO CHECK U801, U821
X201
OSCILLATE AS 24M? NO
CHECK U201 OR U401’S
SOLDERING CONDITION
AND CHECK CONNECTION
LINE FROM U201 TO U401
NO
TROUBLE IN CABLE
OR LCD MODULE
J703’S PIN1
3.3V?
YES
YES
YES
YES
3. WHITE SCREEN (OSD IS NOT DISPLAYED)
WHITE SCREEN
(OSD IS NOT DISPLAYED)
U401
PIN12 IS 65MHz CLOCK?
PIN2 IS 48KHz H-SYNC?
PIN3 IS 60Hz V-SYNC?
PIN1 IS 48KHz H-SYNC?
IS PULSE APPEARED
AT SIGNAL
PINS?
Input
1024x768@60Hz Signal.

- 17 -
CHECK
CMF 401, 402,
403, 404’S
WAVEFORM?
NO CHECK U401
CHECK J703’S
SOLDERING CONDITION
YES
4. RAINBOW SCREEN
RAINBOW SCREEN
(OSD IS NOT DISPLAYED)

PRINTED CIRCUIT BOARD
- 18 -
1. MAIN BOARD (Component Side)
C825 C824
C827
R805
R804 U821
C828
C802
C803 C801 R801
R806
U803
15 20
C826 R5
C806
R210
C534
L803
L801
L703
L702
L701
J801
C832
1
10
U801 R7
R6
C808
C807
L802
C809
C535
R1
R541
R539
R542
R540 C530
R537
L503
L1
C831
ZD801
C510 R506 C512 C515 C511 R504 R505 R503 C513 C538 R507 R502
C841 C840
R8
X201
C201
R216
C202
U504
C533
C528
R535
Q501
D713
D717
J702
U506
C539
R229
R208
Y
W
V
U
T
R
R215
R201
J
K L M
P
N
R217
C D
E
F
G
H
L502
U201
1
A
B
R538
Q502
R523
R509
234 567
L805
R545
C540 C541
R543
R508
R544
8 9 10 11 12 13
U503
D720 D714
R555
R556
R557
R558 R563
R562
R561
R560
C829
C502 R510
C537 U510
14 15 16 17 18 19
ZD703 D710 D712
D701
C834
C833
C543
C542 R809
R554 R559
R567 R525
C501 R501
X501
BA204 BA205
20
C280
R548 R547
C219
R549 R546
R228
D716
C830
C821
BA201
C234
L203
L202
BA202 BA203
BA206
C268 C267 C266
C210
C211
C204
C282
C281
C213
C215
R220
R221
R222
R223
R226
R224
R225
R227
D708 D709
ZD705
C429
C425
C433
R409
R408
L810
U501
L204
CA201
C217
C233
1
CA202
60 CA204
CA203
50
CA206
CA205
ZD702 C414
C702 C701
R721
R720 ZD701
D705
D706 D707
L707
C422 C423 C424
C427 C428
L706
C431
C432
R406
R407
C820 L804 10
U401
40
C401
R402
L401
C415
D704D703
P/N :6870T326A12 DATE :2001.07.16
MODEL:LI561G(IBM)
R740 R743
C426
R536
R534
R533
Q705
C430
R529
L403
20 CMF403
30 CMF404
R401 C819
R803
J701
R739
R742
C712
R710
Q704
L705
L712
L711
L710
C719
C718
C713
CMF401 CMF402
C417
C416
R711
R736
R737 C818
C837
L402
U881
U802
R802
C709
C710 R735 R734
D504
ZD704
D505
C711
R741
J704
1
L720
L714
L713
L715
C421
J703
C817 C816
R738
ZD502
R551
R553
R552
ZD501 C536
R550
U505

- 19 -
2. MAIN BOARD (Solder Side)
C810
C813
R808
R807
C835
C836
C812
C815
C811
C814
C265
C277
C272
C269
C278
C284
R519
C216
C218
C225
C226
C804
C256
C255
C257
C285
C286
R219 R520
R521
R522
R207
C229
C249
C261
C260
C289
C288
C287
R724
R723
R722
R725
R726
R518
C505
C205
C206
C207
C250
C262
R218
C290
C291
C292
R728
R727
R511
R512
C212
C208
C209
C263
C264
C294
C295
C293
R516
R532
C507
C508
C214
C238
C203
C274
C296
R701
C506
R517
C509
R531
L201
C275
C276
R702
R704
R703
R709
C504
C842
C843
C404
C419
C408
C418
C420C240
C241
C239
C237
C245
C251
R706
R705
C503
C402
R9
C405
R403
R405
C409
C242
C243
C244
C412
C411
C248
C247
C246
C253
C254
C252
R708
R707
C403
C410
C406
C413
C838
C850
R810
C714
C407
C839
C715
25
20
30
15
35
10
5
40
1

- 20 -
1
2
7
6
5
89
3
10 14
15 16
17
20
30 29
21
23
24
22
25
27
28
26
19
12
11
4
13
32
31
18
EXPLODED VIEW