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CHASSIS
SERVICE MANUAL
SPECIFICATIONS
6557-03N/03S/43N/43S
N3
COLOR MONITOR
6557-03N/43N
N. Hemisphere Model
AEP Model
Japan Model
6557-03S/43S
S. Hemisphere Model
Picture tube
0.25 ­ 0.27 mm aperture grille pitch
19 inches measured diagonally
90-degree deflection
Viewable image size
Approx. 365
× 273 mm (w/h)
(14 3/8
× 10 3/4 inches)
18.0" viewing image
Resolution
Horizontal: Max. 1600 dots
Vertical: Max. 1200 lines
Standard image area
Approx. 330
× 264 mm (w/h)
(13
× 10 1/2 inches)
or
Approx. 352
× 264 mm (w/h)
(13 7/8
× 10 1/2 inches)
Deflection frequency
Horizontal: 30 to 94 kHz
Vertical: 50 to 160 Hz
256
< Total Line < 2048
AC input voltage/current
100 to 240 V, 50 ­ 60 Hz, 1.8 ­ 1.0
A
Power consumption
Max. 130 W
Dimensions
462.2
× 477.5 × 475.5 mm (w/h/d)
(18 1/4
× 18 7/8 × 18 3/4 inches)
Mass
Approx. 25 kg (55 lb 2 oz)
Design and specifications are subject to change without
notice.
MODEL
SPEC.
BODY COLOR
DEST.
6557-03N
WHITE TYPE
NH, AEP, J
6557-03S
SH
6557-43N
BLACK TYPE
NH, AEP, J
6557-43S
SH


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6557-03N/03S/43N/43S
­ 2 ­
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 FONCTIONNE-MENT
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
(US Model only)
1.5 k
0.15
µF
AC
Voltmeter
(0.75 V)
To Exposed Metal
Parts on Set
Earth Ground
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.


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6557-03N/03S/43N/43S
­ 3 ­
POWER SAVING FUNCTION
DIAGNOSIS
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.
You can set the delay time before the monitor enters the
power saving mode using the OSD. Set the time according
to "Setting the power saving delay time" on page 15.
1
2
3
4
5
Note
If no video signal is input to the monitor, the "NO INPUT
SIGNAL" message (page 18) appears. After the delay time has
passed, the power saving function automatically puts the
monitor into the active-off mode and the u indicator lights up
orange. Once the horizontal and vertical sync signals are
detected, the monitor automatically resumes its normal operation
mode.
Recovery time
--
Approx. 3 sec.
Approx. 3 sec.
Approx. 15 sec. max.
--
u
indicator
Green
Green and orange
alternate
Green and orange
alternate
Orange
Off
Power
consumption
130 W
80 W
15 W
5 W
0 W
Power consumption
mode
Normal operation
Standby (1st mode)
Suspend (2nd mode)
Active-off (3rd mode)
Power-off
Screen
active
blank
blank
blank
--
Horizontal
sync signal
present
absent
present
absent
--
Vertical
sync signal
present
present
absent
absent
--
Failure
+B failure
Horizontal / Vertical Deflection
failure, Thermal protector
ABL protector
HV failure
Aging / Self Test
Power LED
Orange
Off
(0.5 sec)
(0.5 sec)
Orange
Off
(1.5 sec)
(0.5 sec)
Orange
Off
(0.5 sec)
(1.5 sec)
Orange
Off
Orange
Off
(0.25 sec)
(0.5 sec)
(0.25 sec)
(1.25 sec)
Orange
Off
Green
Off
(0.5 sec)
(0.5 sec)
(0.5 sec)
(0.5 sec)
Aging Mode (Video Aging) : During Power Save, press "MENU" key for longer than 2 second.
Self Test (OSD Color Bar) : During Power Save, press "CONTRAST" + (
/) key for longer than 2 second.
Reliability Check Mode
: During Power Save, press "CONTRAST"­ (
?) key for longer than 2 second.


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6557-03N/03S/43N/43S
­ 4 ­
MODE AT
MODE 1
MODE 2
MODE 3
MODE 4
MODE 5
MODE 6
MODE 7
MODE 8
MODE 9
PRODUCTION
RESOLUTION
656 X 496
640 X 480
800 X 600
1024 X 768
1024 X 768
1280 X 1024
1280 X 960
1280 X 1024 1600 X 1200
CLOCK
25.175 MHz
36.000 MHz
56.250 MHz
78.750 MHz
94.500 MHz
135.000 MHz 148.500 MHz 157.500 MHz 202.500 MHz
-- HORIZONTAL --
H-FREQ
31.469 kHz
43.269 kHz
53.674 kHz
60.023 kHz
68.677 kHz
79.976 kHz
85.938 kHz
91.146 kHz
93.750 kHz
usec
usec
usec
usec
usec
usec
usec
usec
usec
H. TOTAL
31.778
23.111
18.631
16.66
14.561
12.504
11.636
10.971
10.667
H. BLK
5.72
5.333
4.409
3.657
3.725
3.022
3.017
2.844
2.765
H. FP
0.318
1.556
0.569
0.203
0.508
0.119
0.431
0.406
0.316
H. SYNC
3.813
1.556
1.138
1.219
1.016
1.067
1.077
1.016
0.948
H. BP
1.589
2.222
2.702
2.235
2.201
1.837
1.508
1.422
1.501
H. ACTIV
26.058
17.778
14.222
13.003
10.836
9.481
8.62
8.127
7.901
-- VERTICAL --
V. FREQ(HZ)
59.940 Hz
85.00 Hz
85.061 Hz
75.029 Hz
84.997 Hz
75.025 Hz
85.002 Hz
85.024 Hz
75.000 Hz
lines
lines
lines
lines
lines
lines
lines
lines
lines
V. TOTAL
525
509
631
800
808
1066
1011
1072
1250
V. BLK
29
29
31
32
40
42
51
48
50
V. FP
2
1
1
1
1
1
1
1
1
V. SYNC
2
3
3
3
3
3
3
3
3
V. BP
25
25
27
28
36
38
47
44
6
V. ACTIV
496
480
600
768
768
1024
960
1024
1200
-- SYNC --
INT(G)
NO
NO
NO
NO
NO
NO
NO
NO
NO
EXT(H/V)/POLARITY
YES N/N
YES N/N
YES P/P
YES P/P
YES P/P
YES P/P
YES P/P
YES P/P
YES P/P
EXT(CS)/POLARITY
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
98.1.13 VER.
TIMING SPECIFICATION


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6557-03N/03S/43N/43S
­ 5 ­
TABLE OF CONTENTS
Section
Title
Page
1. GENERAL ................................................................. 1-1
2. DISASSEMBLY
2-1.
Cabinet Removal ............................................... 2-1
2-2.
A Board Removal .............................................. 2-1
2-3.
AC inI/O TERMINAL Board Removal ............. 2-2
2-4.
D Board Removal .............................................. 2-2
2-5.
Service Position .................................................. 2-3
2-6.
H Boards Removal ............................................ 2-3
2-7.
Picture Tube Removal ....................................... 2-4
3. SAFETY RELATED ADJUSTMENT ............. 3-1
4. ADJUSTMENTS ..................................................... 4-1
5. DIAGRAMS
5-1.
Block Diagrams
(with Frame Schematic Diagram) ...................... 5-1
5-2.
Circuit Boards Location ..................................... 5-4
5-3.
Schematic Diagrams and Printed Wiring
Boards ................................................................. 5-4
(1)
Schematic Diagram of D Board ........................ 5-5
(2)
Schematic Diagram of A Board ........................ 5-13
(3)
Schematic Diagram of H Board ........................ 5-16
5-4.
Semiconductors ................................................. 5-17
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