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CHASSIS
SERVICE MANUAL
SPECIFICATIONS
D99
AEP Model
Chassis No. SCC-L29T-A(6550-T3N)
Chassis No. SCC-L29U-A(6550-U3N)
COLOR MONITOR
6550-T3N/U3N
Picture tube
0.24 mm aperture grille pitch
17 inches measured diagonally
90-degree deflection
Viewable image size
Approx. 327
× 243 mm (w/h)
(12 7/8
× 9 5/8 inches)
16.0" viewable diagonal
Resolution
Horizontal: Max. 1600 dots
Vertical: Max. 1200 lines
Standard image area
Approx. 312
× 234 mm (w/h)
(12 3/8
× 9 1/4 inches)
Deflection frequency
Horizontal: 30 to 94 kHz
Vertical: 48 to 120 Hz
300
< Total Line < 1700
AC input voltage/current
220 to 240 V, 50 ­ 60 Hz, Max. 1.0 A
Power consumption
Max. 130 W
Dimensions
Approx. 406
× 416 × 431 mm
(w/h/d)
(16
× 16 1/2 × 17 inches)
Mass
Approx. 20 kg (44 lb 1 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 500
µsec.
Design and specifications are subject to change without
notice.
MODEL
BODY COLOR
6550-T3N
WHITE TYPE
6550-U3N
BLACK TYPE


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6550-T3N/U3N
­ 2 ­
DIAGNOSIS
Failure
Power LED
HV/+B Failure
Blink Amber (On 0.5 sec, Off 0.5 sec)
H Stop or V Stop (Included S-Cap)
Blink Amber (On 0.5 sec, Off 0.5 sec)
ABL Failure
Blink Amber (On 0.5 sec, Off 1.5 sec)
Aging/Self-Test
Blink Amber (On 0.5 sec, Off 0.5 sec) .... Blink Green (On 0.5 sec, Off 0.5 sec)
TIMING SPECIFICATION
PRIMARY MODE
PRIMARY
MODE AT PRODUCTION
MODE 1
MODE 2
MODE 3
MODE 4
MODE 5
MODE 6
MODE 7
MODE 8
MODE 9
MODE 10
RESOLUTION
640 X 480
640 X 480
640 X 480
800 X 600
800 X 600
1024 X 768
1024 X 768
1280 X 1024
1280 X 1024 1600 X 1200
CLOCK
25.175 MHz
31.500 MHz
36.000 MHz
49.500 MHz
56.250 MHz
78.750 MHz
94.500 MHz
135.000 MHz
157.500 MHz 202.500 MHz
-- HORIZONTAL --
H-FREQ
31.469 kHz
37.500 kHz
43.269 kHz
46.875 kHz
53.674 kHz
60.023 kHz
68.677 kHz
79.976 kHz
91.146 kHz
93.750 kHz
usec
usec
usec
usec
usec
usec
usec
usec
usec
usec
H. TOTAL
31.778
26.667
23.111
21.333
18.631
16.660
14.561
12.504
10.971
10.667
H. BLK
6.356
6.349
5.333
5.172
4.409
3.657
3.725
3.022
2.844
2.765
H. FP
0.636
0.508
1.556
0.323
0.569
0.203
0.508
0.119
0.406
0.316
H. SYNC
3.813
2.032
1.556
1.616
1.138
1.219
1.016
1.067
1.016
0.948
H. BP
1.907
3.810
2.222
3.232
2.702
2.235
2.201
1.837
1.422
1.501
H. ACTIV
25.422
20.317
17.778
16.162
14.222
13.003
10.836
9.481
8.127
7.901
-- VERTICAL --
V. FREQ(HZ)
59.940 Hz
75.000 Hz
85.008 Hz
75.000 Hz
85.061 Hz
75.029 Hz
84.997 Hz
75.025 Hz
85.024 Hz
75.000 Hz
lines
lines
lines
lines
lines
lines
lines
lines
lines
lines
V. TOTAL
525
500
509
625
631
800
808
1066
1072
1250
V. BLK
45
20
29
25
31
32
40
42
48
50
V. FP
10
1
1
1
1
1
1
1
1
1
V. SYNC
2
3
3
3
3
3
3
3
3
3
V. BP
33
16
25
21
27
28
36
38
44
46
V. ACTIV
480
480
480
600
600
768
768
1024
1024
1200
-- SYNC --
INT(G)
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
EXT(H/V)/POLARITY
YES -/-
YES -/-
YES +/+
YES +/+
YES +/+
YES +/+
YES +/+
YES +/+
YES +/+
YES +/+
EXT(CS)/POLARITY
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
INT/NON INT
NON INT
NON INT
NON INT
NON INT
NON INT
NON INT
NON INT
NON INT
NON INT
NON INT
99.5.18 VER.
Power Saving Function
This monitor meets the power-saving guidelines set by
VESA and
ENERGY STAR, as well as the more stringent
NUTEK .
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.
--
u
indicator
Green
Green and orange
alternate
Green and orange
alternate
Orange
Off
Power
consumption
130 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 15). 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.


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6550-T3N/U3N
­ 3 ­
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 SUS-
PECTED.
AVERTISSEMENT!!
NE JAMAIS METTRE SOUS TENSION QUAND LA
BOBINE DE DEMAGNETISATION EST ENLEVÉE.
ATTENTION AUX COMPOSANTS RELATIFS À LA
SÉCURITÉ!!
LES COMPOSANTS IDENTIFIÉS PAR UNE TRAME ET
UNE MARQUE
¡ SONT CRITIQUES POUR LA SÉCURITÉ.
NE LES REMPLACER QUE PAR UNE PIÈCE PORTANT LE
NUMÉRO SPECIFIÉ. LES RÉGLAGES DE CIRCUIT DONT
L'IMPORTANCE EST CRITIQUE POUR LA SÉCURITÉ DU
FONCTIONNEMENT SONT IDENTIFIÉS DANS LE
PRÉSENT MANUEL. SUIVRE CES PROCÉDURES LORS
DE CHAQUE REMPLACEMENT DE COMPOSANTS CRI-
TIQUES, OU LORSQU'UN MAUVAIS FONCTIONNEMENT
EST SUSPECTÉ.
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
0.15
µF
AC
Voltmeter
(0.75 V)
To Exposed Metal
Parts on Set
Earth Ground


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6550-T3N/U3N
­ 4 ­
TABLE OF CONTENTS
Section
Title
Page
1. GENERAL .................................................................. 1-1
2. DISASSEMBLY
2-1.
Cabinet and EMI Shield Removal ...................... 2-1
2-2.
A and D Boards Removal ................................... 2-2
2-3.
Service Position .................................................... 2-2
2-4.
Picture Tube Removal .......................................... 2-3
3. SAFETY RELATED ADJUSTMENT ............. 3-1
4. ADJUSTMENTS ...................................................... 4-1
5. DIAGRAMS
5-1.
Block Diagrams ................................................... 5-1
5-2.
Circuit Boards Location ...................................... 5-5
5-3.
Schematic Diagrams and Printed Wiring Boards ....... 5-6
(1) Schematic Diagram of D Board .......................... 5-7
(2) Schematic Diagram of A Board .......................... 5-19
5-4.
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


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1-1
SECTION 1
GENERAL
The operating instructions mentioned here are partial abstracts
from the Operating Instruction Manual. The page numbers of
the Operating Instruction Manual remein as in the manual.
2
Getting Started
Use of the Tilt-Swivel
This monitor can be adjusted within the angles shown
below. To find the center of the monitor's turning radius,
align the center of the monitor's screen with the centering
dots on the stand.
Hold the monitor at the bottom with both hands when you
turn it horizontally or vertically. Be careful not to pinch
your fingers at the back of the monitor when you tilt the
monitor up vertically.
Note
Do not remove the tilt-swivel base from the monitor.
Warning on power connection
· Use an appropriate power cord for your local power
supply.
Examples of plug types:
· Before disconnecting the power cord, wait at least 30
seconds after turning off the power to allow the static
electricity on the CRT display surface to discharge.
· After the power has been turned on, the CRT is
demagnetized (degaussed) for about 5 seconds. This
generates a strong magnetic field around the metal frame,
which may affect the data stored on magnetic tapes and
disks near the bezel. Place magnetic recording equipment,
tapes, and disks away from this monitor.
The equipment should be installed near an easily
accessible electrical outlet.
Precautions
Installation
· Prevent internal heat build-up by allowing adequate air
circulation. Do not place the monitor on surfaces (rugs,
blankets, etc.) or near materials (curtains, draperies) that
may block the ventilation holes.
· Do not install the monitor near heat sources such as
radiators or air ducts, or in a place subject to direct
sunlight, excessive dust, mechanical vibration, or shock.
· Do not place the monitor near equipment which generates
magnetism, such as a transformer or high voltage power
lines.
Maintenance
· Clean the cabinet, panel and controls with a soft cloth
lightly moistened with a mild detergent solution. Do not
use any type of abrasive pad, scouring powder, or
solvent, such as alcohol or benzine.
· Do not rub, touch, or tap the surface of the screen with
sharp or abrasive items such as a ballpoint pen or
screwdriver. This type of contact may result in a scratched
picture tube.
· Clean the screen with a soft cloth. If you use a glass
cleaning liquid, do not use any type of cleaner containing
an anti-static solution or similar additive as this may
scratch the screen's coating.
Transportation
When you transport this monitor for repair or shipment, use
the original carton and packing materials.
Getting started
for 200 to 240 V AC
for 240 V AC only
90
°
90
°
15
°
5
°
Centering dots
3
Getting Started
Getting Started
F
EN
ES
C
Identifying Parts and Controls
See the pages in parentheses for further details.
Front
1 ? (reset) button (page 13)
Resets the adjustments to the factory settings.
2 ¨ (brightness) down and up (./>) buttons
(pages 5 ­ 13)
Adjust the picture brightness.
Function as the (./>) buttons when adjusting other
items.
3
(menu) button (pages 5 ­ 13, 15)
Displays the MENU OSD.
4 > (contrast) left and right (?//) buttons
(pages 5 ­ 13, 18)
Adjust the contrast.
Function as the (?//) buttons when adjusting other
items.
5 u (power) switch and indicator (pages 14,
18)
Turns the monitor on or off.
The power indicator lights up in green when the
monitor is turned on, and either flashes in green and
orange, or lights up in orange when the monitor is in
power saving mode.
Rear
6 AC IN connector (page 4)
Provides AC power to the monitor.
7 Video input connector (HD15) (page 4)
Inputs RGB video signals (0.700 Vp-p, positive) and
SYNC signals.
Pin No.
1
2
3
4
5
6
7
Pin No.
8
9
10
11
12
13
14
15
Signal
Red
Green
(Sync on Green)
Blue
ID (Ground)
DDC Ground*
Red Ground
Green Ground
Signal
Blue Ground
--
Ground
ID (Ground)
Bi-Directional
Data (SDA)*
H. Sync
V. Sync
Data Clock(SCL)*
*
Display Data Channel (DDC) Standard of VESA
1 2
3 4 5
8
7
6
11 12 13 14 15
10
9