IBM 6551-T3N User manual

CHASSIS
SPECIFICATIONS
SERVICE MANUAL
F99
TRINITRON ® COLOR
GRAPHIC DISPLAY
6551-T3N/6551-U3N
AEP Model
Chassis No. SCC-L40A-A (6551-T3N)
Chassis No. SCC-L40B-A (6551-U3N)
MODEL SPEC.
BODY COLOR DEST.
6551-T3N WHITE TYPE AEP
6551-U3N BLACK TYPE AEP
Picture tube 0.24 mm aperture grille pitch
19 inches measured diagonally
90-degree deflection
Viewable image size pprox. 365 × 274 mm (w/h)
(14 3/8 × 10 7/8 inches)
18.0” viewable diagonal
Resolution Horizontal: Max. 1600 dots
Vertical: Max. 1200 lines
Standard image area pprox. 352 × 264 mm (w/h)
(13 7/8 × 10 1/2 inches)
Deflection frequency* Horizontal: 30 to 107kHz
Vertical: 48 to 120 Hz
256 < Total Line < 2048
C input voltage/current
220 to 240 V, 50 – 60 Hz, Max. 1.0
Power consumption Max. 140 W
Operating temperature 10°C to 40°C
Dimensions pprox. 462 × 462 × 474 mm
(w/h/d)
(18 1/4 × 18 1/4 × 18 3/4 inches)
Mass pprox. 27 kg (59 lb 8 oz)
* Recommended horizontal and vertical timing condition
• Horizontal sync width should be more than 1.0 µsec.
• Horizontal blanking width should be more than
3.0µsec.
• Vertical blanking width should be more than 450 µsec.
Design and specifications are subject to change without
notice.

6551-T3N/6551-U3N
– 2 –
LEAKAGE TEST
The AC leakage from any exposed metal part to earth ground
and from all exposed metal parts to any exposed metal part hav-
ing a return to chassis, must not exceed 0.5 mA (500
microampers).
Leakage current can be measured by any one of three methods.
1. A commercial leakage tester, such as the Simpson 229 or
RCA WT-540A. Follow the manufacturers’ instructions to
use these instruments.
2. A battery-operated AC milliammeter. The Data Precision
245 digital multimeter is suitable for this job.
3. Measuring the voltage drop across a resistor by means of a
VOM or battery-operated AC voltmeter. The “limit” indica-
tion is 0.75 V, so analog meters must have an accurate low-
voltage scale. The Simpson 250 and Sanwa SH-63Trd are
examples of a passive VOMs that are suitable. Nearly all
battery operated digital multimeters that have a 2 V AC
range are suitable. (See Fig. A)
WARNING!!
NEVER TURN ON THE POWER IN A CONDITION IN
WHICH THE DEGAUSS COIL HAS BEEN REMOVED.
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY SHADING AND MARK
¡ON THE SCHEMATIC DIAGRAMS, EXPLODED
VIEWS AND IN THE PARTS LIST ARE CRITICAL FOR
SAFE OPERATION. REPLACE THESE COMPONENTS
WITH SONY PARTS WHOSE PART NUMBERS AP-
PEAR AS SHOWN IN THIS MANUAL OR IN SUPPLE-
MENTS PUBLISHED BY SONY. CIRCUIT ADJUST-
MENTS THAT ARE CRITICAL FOR SAFE OPERATION
ARE IDENTIFIED IN THIS MANUAL. FOLLOW THESE
PROCEDURES WHENEVER CRITICAL COMPONENTS
ARE REPLACED OR IMPROPER OPERATION IS
SUSPECTED.
After correcting the original service problem, perform the fol-
lowing safety checks before releasing the set to the customer:
1. Check the area of your repair for unsoldered or poorly-sol-
dered connections. Check the entire board surface for solder
splashes and bridges.
2. Check the interboard wiring to ensure that no wires are
“pinched” or contact high-wattage resistors.
3. Check that all control knobs, shields, covers, ground straps,
and mounting hardware have been replaced. Be absolutely
certain that you have replaced all the insulators.
4. Look for unauthorized replacement parts, particularly tran-
sistors, that were installed during a previous repair. Point
them out to the customer and recommend their replacement.
5. Look for parts which, though functioning, show obvious
signs of deterioration. Point them out to the customer and
recommend their replacement.
6. Check the line cords for cracks and abrasion. Recommend
the replacement of any such line cord to the customer.
7. Check the B+ and HV to see if they are specified values.
Make sure your instruments are accurate; be suspicious of
your HV meter if sets always have low HV.
8. Check the antenna terminals, metal trim, “metallized”
knobs, screws, and all other exposed metal parts for AC
Leakage. Check leakage as described below.
Fig. A. Using an AC voltmeter to check AC leakage.
SAFETY CHECK-OUT
1.5 k Ω 0.15 µF
AC
Voltmeter
(0.75 V)
To Exposed Metal
Parts on Set
Earth Ground

6551-T3N/6551-U3N
– 3 –
This monitor meets the power-saving guidelines set by
VESA and
E NERGY S TAR, as well as the more stringent
N TEK .
If the monitor is connected to a computer or video graphics
board that is VESA DPMS (Display Power Management
Signaling) compliant, the monitor will automatically reduce
power consumption in three stages as shown below.
1
2
3
4
5
Recovery time
—
Approx. 5 sec.
Approx. 5 sec.
Approx. 15 sec.
—
indicator
Green
Green and orange
alternate
Green and orange
alternate
Orange
Off
Power
consumption
≤ 140 W
≤ 15 W
≤ 15 W
≤ 3 W
≤ 0.5 W
Screen
active
blank
blank
blank
—
Horizontal
sync signal
present
absent
present
absent
—
Vertical
sync signal
present
present
absent
absent
—
Notes
• When your computer is in a power saving mode, MONITOR IS
IN POWER SAVE MODE appears on the screen if you press any
button on the monitor (page 17). After a few seconds, the
monitor enters the power saving mode again. Once the
horizontal and vertical sync signals are detected, the monitor
automatically resumes its normal operation mode.
• The power management feature is invoked when the computer
recognizes that you have not used your mouse or keyboard for a
user-definable period of time.
• IBM recommends that you switch off your monitor at the end of
each working day, or whenever you expect to leave it unused for
long periods during the day.
Power consumption
mode
Normal operation
Standby (1st mode)
Suspend (2nd mode)
(sleep)*
Active-off (3rd mode)
(deep sleep)*
Power-off
* “Sleep” and “deep sleep” are power saving modes defined by the Environmental Protection Agency.
This monitor is equipped with a self-diagnosis function. If
there is a problem with your monitor or computer, the
screen will go blank and the indicator will either light up
green or flash orange.
If the indicator is green
1 Disconnect the video input cable or turn off the
connected computer.
2 Press the button twice to turn the monitor off and
then on.
3 Press and hold the button for 2 seconds before
the monitor enters power saving mode.
If all four color bars appear (white, red, green, blue), the
monitor is working properly. Reconnect the video input
cable and check the condition of your computer.
If the color bars do not appear, there is a potential monitor
failure. Inform the IBM HelpCenter of the monitor’s
condition.
If the indicator is flashing orange
Press the button twice to turn the monitor off and
then on.
If the indicator lights up green, the monitor is working
properly.
If the indicator is still flashing, there is a potential
monitor failure. Inform the IBM HelpCenter of the monitor’s
condition. Be sure to note the model name and serial
number of your monitor. Also note the make and model of
your computer and video board.
indicator
POWER SAVING FUNCTION
DIAGNOSIS

6551-T3N/6551-U3N
–4 –
TIMING SPECIFICATION
MODE TEST MODE
MODE AT PRODUCTION MODE 1 MODE 2 MODE 3 MODE 4 MODE 5
RESOLUTION 640 X 480 640 X 480 800 X 600 800 X 600 1024 X 768
CLOCK 25.175 MHz 36.000 MHz 49.500 MHz 56.250 MHz 78.750 MHz
HORIZONTAL
H-FREQ 31.469 kHz 43.269 kHz 46.875 kHz 53.674 kHz 60.023 kHz
usec usec usec usec usec
H. TOTAL 31.778 23.111 21.333 18.631 16.660
H. BLK 6.356 5.333 5.172 4.409 3.657
H. FP 0.636 1.556 0.323 0.569 0.203
H. SYNC 3.813 1.556 1.616 1.138 1.219
H. BP 1.907 2.222 3.232 2.702 2.235
H. ACTIV 25.422 17.778 16.162 14.222 13.003
–VERTICAL –
V. FREQ(HZ) 59.940 Hz 85.008 Hz 75.000 Hz 85.061 Hz 75.029 Hz
lines lines lines lines lines
V. TOTAL 525 509 625 631 800
V. BLK 45 29 25 31 32
V.FP 101111
V. SYNC 2 3333
V. BP 33 25 21 27 28
V. ACTIV 480 480 600 600 768
–SYNC –
INT(G) NO NO NO NO NO
EXT(H/V)/POLARITY YES N/N YES N/N YES P/P YES P/P YES P/P
EXT(CS) /POLARITY NO NO NO NO NO
INT/NON INT NON INT NON INT NON INT NON INT NON INT
SIZE 352 X 264 mm 352 X 264 mm 352 X 264 mm 352 X 264 mm 352 X 264 mm
MODE TEST MODE
MODE AT PRODUCTION MODE 6 MODE 7 MODE 8 MODE 9 MODE 10
RESOLUTION 1024 X 768 1280 X 1024 1280 X 1024 1600 X 1200 1600 X 1200
CLOCK 94.500 MHz 135.000 MHz 157.500 MHz 202.500 MHz 229.500 MHz
HORIZONTAL
H-FREQ 68.677 kHz 79.976 kHz 91.146 kHz 93.750 kHz 106.250 kHz
usec usec usec usec usec
H. TOTAL 14.561 12.504 10.971 10.667 9.412
H. BLK 3.725 3.022 2.844 2.765 2.440
H. FP 0.508 0.119 0.406 0.316 0.279
H. SYNC 1.016 1.067 1.016 0.948 0.837
H. BP 2.201 1.837 1.422 1.501 1.325
H. ACTIV 10.836 9.481 8.127 7.901 6.972
–VERTICAL –
V. FREQ(HZ) 84.997 Hz 75.025 Hz 85.024 Hz 75.000 Hz 85.000 Hz
lines lines lines lines lines
V. TOTAL 808 1066 1072 1250 1250
V. BLK 40 42 48 50 50
V.FP 11111
V. SYNC 3 3333
V. BP 36 38 44 46 46
V. ACTIV 768 1024 1024 1200 1200
–SYNC –
INT(G) NO NO NO NO NO
EXT(H/V)/POLARITY YES P/P YES P/P YES P/P YES P/P YES P/P
EXT(CS) /POLARITY NO NO NO NO NO
INT/NON INT NON INT NON INT NON INT NON INT NON INT
SIZE 352 X 264 mm 330 X 264 mm 330 X 264 mm 352 X 264 mm 352 X 264 mm
99.04.26 VER.

6551-T3N/6551-U3N
– 5 –
TABLE OF CONTENTS
Section Title Page
1. GENERAL ................................................................. 1-1
2. DISASSEMBLY
2-1. Cabinet Removal ................................................ 2-1
2-2. Shield (EMI, Video),
Side Cover (L and R) Removal.......................... 2-1
2-3. A Board Removal ............................................... 2-2
2-4. Rear Shield Complete Assy,
D Board Removal ............................................... 2-2
2-5. Service Position .................................................. 2-3
2-6. H Board Removal ............................................... 2-3
2-7. Picture Tube Removal........................................ 2-4
2-8. Harness Location ................................................ 2-5
3. SAFETY RELATED ADJUSTMENT............. 3-1
4. ADJUSTMENTS ..................................................... 4-1
5. DIAGRAMS
5-1. Block Diagrams .................................................. 5-1
5-2. Frame Schematic Diagram ................................. 5-5
5-3. Circuit Boards Location ..................................... 5-6
5-4. Schematic Diagrams and Printed Wiring
Boards ................................................................. 5-7
(1) Schematic Diagram of A Board ......................... 5-9
(2) Schematic Diagrams of D (a,b,c) Board.... 5-11
(3) Schematic Diagrams of N, H Boards................. 5-19
5-5. Semiconductors .................................................. 5-21
6. EXPLODED VIEWS
6-1. Chassis ................................................................ 6-1
6-2. Picture Tube........................................................ 6-2
6-3. Packing Materials ............................................... 6-3
7. ELECTRICAL PARTS LIST ............................ 7-1

SECTION 1
GENERAL
The operating instructions mentioned here are partial abstracts from the Operating Instruction Manual. The page numbers of the Operating Instruction Manual remain as in the manual.
1-1
2

1-2
4

1-3

1-4

1-5

1-6

1-7

1-8

1-9

1-10

6551-T3N/6551-U3N
5
Two screws (+BVTP 4 x 16)
3
Screw cover (UL)
1
Screw cover (UR)
6
Bucket assy
Push in the tip of a
screwdriver to
unlock the claw.
2
2
1
Screw cover (LL)
4
Screw cover (LR)
5
Two screws (+BVTP 4 x 16)
Four screws
(+BVTT 4 x 8)
5
Four screws
(+BVTT 4 x 8)
7
Five screws
(+BVTT 4 x 8)
8
Video shield
3
Two screws
(+BVTT 4 x 8)
1
2
EMI shield (Upper)
4
Side cover (L)
6
Side cover (R)
2-1. CABINET REMOVAL
SECTION 2
DISASSEMBLY
2-2. SHIELD (EMI, VIDEO),
SIDE COVER (L and R) REMOVAL
2-1

6551-T3N/6551-U3N
5
Three screws
(+BVTP 3 x 8)
CN904
CN601
CN600
CN303
7
D board
N board
6
Screw
(+P 3.5 x 20)
2
Screw
(+BVTT 4 x 8)
4
Rear shield
complete assembly
1
Cable cover
3
Widening the chassis toward
the direction A , disengage
two claws.
A
A
Refering to 2-3, disconnect five connectors
(CN303, CN305, CN306, CN309 and CN311).
4
Three screws
(+BVTT 3 x 8)
5
A board
CN308
CN306
CN311
CN303
CN309
CN305
1
Screw
(+BVTT 4 x 8)
2
Cable stopper
3
Two screws
2-3. A BOARD REMOVAL
2-4. REAR SHIELD COMPLETE ASSY,
D BOARD REMOVAL
2-2

6551-T3N/6551-U3N
Four screws
(Tapping screw (5))
H board
Two screws
(+ BVTP 4 x 16)
Input selection
CN2001
Picture tube shield
Before removing the bezel assembly,
secure the picture tube shield at the
positions shown with the arrow (diagonal
two places) to prevent the picture tube
from falling. (Use the screws +BVTT 4 8
that fix shield.)
6
Bezel assembl
y
3
5
4
2
1
AC inlet
D board
A board
1
2
3
2-6. H BOARD REMOVAL
2-5. SERVICE POSITION
2-3

6551-T3N/6551-U3N
a
b
2-7. PICTURE TUBE REMOVAL
2-4
CN11
CN2001
CN1
2pin
4
Four screws
(Tapping screw (5))
3
Three connectors
7
Neck assembly
1
Anode cap
2
A board
8
Deflection yoke
6
Picture tube
5
Bezel assembly
3When one side of the rubber cap is
separated from the anode button, the
anode-cap can be removed by turning
up the rubber cap and pulling up it in the
direction of the arrow c.
•HOW TO HANDLE AN ANODE-CAP
1Don’t scratch the surface of anode-caps with sharp shaped
material!
2Don’t press the rubber hardly not to damage inside of anode-
caps!
A material fitting called as shatter-hook terminal is built in the
rubber.
3Don’t turn the foot of rubber over hardly!
The shatter-hook terminal will stick out or damage the rubber.
•REMOVAL OF ANODE-CAP
NOTE: Short circuit the anode of the picture tube and the anode cap to the metal chassis, CRT shield or carbon painted on the CRT, after
removing the anode.
•REMOVING PROCEDURES
1Turn up one side of the rubber cap in
the direction indicated by the arrow a.2Using a thumb pull up the rubber cap firmly in the direction indicated by the
arrow b.
c
Anode Button

6551-T3N/6551-U3N
CN603
CN501
CN600
H board
Degaussing coil
N board
FBT
A board
Picture tube
Rear shield
Side cover (L)
CN11
CN2001
CN1
CN702
CN701
CN904
CN901
CN601
CN315
CN309
CN301
CN313
CN302
CN1003 CN1002
CN1004
D board
AC inlet
CN310
CN306
CN311
CN303 CN308
2-8. HARNESS LOCATION
2-5