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SERVICE MANUAL
19CR1 CHASSIS
Design and specifications are subject to change without notice.
TRINITRON® COLOR MONITOR
AEP Model
Chassis No: SCC-L33CA
CPD-G420
9-978-887-01
SPECIFICATIONS
Self Diagnosis
Supported model
Deflection frequency*
Horizontal: 30 to 110 kHz
Vertical: 48 to 170 Hz
AC input voltage/current 100V to 240V, 50 - 60Hz,
2.0 - 1.0 A
Dimensions
451 x 471 x 461 mm (w/h/d)
(177/8 x 185/8 x 181/4 inches)
Mass
Approx. 25.5 kg (56 lb 3 oz.)
Plug and Play
DDC2B/DDC2Bi, GTF**
*
Recommended horizontal and vertical timing condition
· Horizontal sync width duty should be more than 4.8% of
total horizontal time or 0.8 µs , whichever is larger.
· Horizontal blanking width should be more than 2.3 µsec.
· Vertical blanking width should be more than 450 µsec.
** If the input signal is Generalized Timing Formula (GTF)
compliant, the GTF feature of the monitor automatically
provides an optimal image for the screen.
Picture tube
0.24 mm aperture grill pitch (center)
19 inches measured diagonally
90-degree deflection
FD Trinitron
Video image area
18" maximum viewing image
Approx. 365 X 274 mm (w/h)
(143/8 x 107/8 inches)
Resolution
Maximum:
Horizontal: Max. 1920 dots
Vertical: Max. 1440 lines
Recommended:
Horizontal: Max. 1280 dots
Vertical: Max. 1024 lines
Standard image area
Approx. 352 x 264 mm (w/h)
(137/8 x 101/2 inches)
Input signal
Video
Analog RGB (75 ohms typical)
0.700 Vp-p Positive
Sync
H/V Separate or Composite Sync:
TTL 2k ohms, Polarity Free
Sync on Green:
0.3 Vp-p Negative
Power Consumption
Approx. 130 W (without any
USB Devices Connected)


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CPD-G420
SECTION TITLE
PAGE
Power Management.................................................................................................................................. 4
Self Diagnosis Function ............................................................................................................................ 4
Timing SpeciÞcation.................................................................................................................................. 4
Warnings and Cautions............................................................................................................................. 5
Safety Check-Out .................................................................................................................................... 6
1. Disassembly
1-1. Cabinet Removal............................................................................................................................... 7
1-2. Service Position ................................................................................................................................ 8
1-3. A1 Board (C Block) Removal ............................................................................................................ 9
1-4. A1 Board and US Board Removal .................................................................................................... 9
1-5. Bezel Assembly and H1 Board Removal ........................................................................................ 10
1-6. D Board Removal............................................................................................................................ 10
1-7. Picture Tube Removal......................................................................................................................11
Anode Cap Removal ........................................................................................................................11
1-8. Harness Location ............................................................................................................................ 12
2. Safety Related Adjustments
2-1. HV Regulator Circuit Check ............................................................................................................ 13
2-2. HV Protector Circuit Check ............................................................................................................. 13
2-3. Beam Current Protector Circuit Check............................................................................................ 13
3. Adjustments
3-1. Landing Rough Adjustment ............................................................................................................. 14
3-2. Landing Fine Adjustment................................................................................................................. 14
3-3. Convergence Rough Adjustment .................................................................................................... 15
3-4. White Balance Adjustment SpeciÞcation......................................................................................... 15
3-5. Vertical and Horizontal Position and Size SpeciÞcation .................................................................. 15
3-6. Focus Adjustment............................................................................................................................ 15
4. Diagrams
4-1. Circuit Boards Location ................................................................................................................... 16
4-2. Printed Wiring Board and Schematic Diagram Information............................................................. 16
4-3. Block Diagrams ............................................................................................................................... 17
4-4. Schematics and Supporting Information ......................................................................................... 20
A1 Board - Schematic Diagram....................................................................................................... 20
D Board - Schematic Diagram ........................................................................................................ 22
DA Board - Schematic Diagram ...................................................................................................... 24
N Board - Schematic Diagram ........................................................................................................ 25
H1 Board - Schematic Diagram ...................................................................................................... 26
US Board - Schematic Diagram ...................................................................................................... 27
4-5. Semiconductors .............................................................................................................................. 29
5. Exploded Views
5-1. Picture Tube ................................................................................................................................... 31
5-2. Chassis ........................................................................................................................................... 32
5-3. Packing Materials............................................................................................................................ 33
6. Electrical Parts List ....................................................................................................................................... 34
TABLE OF CONTENTS


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CPD-G420
Power consumption
Screen
Horizontal
Vertical
Power
Recovery time
Indicator
mode
(video)
sync signal sync signal consumption
1
Normal operation
active
yes
yes
< 130 W
--
Green
2
Active-off (3rd mode)
blank
no*
no*
< 3 W
Approx. 10 sec.
Amber
3
Power-off
--
--
--
0 W (approx)
--
Off
* In this mode, the signal appears in one of three ways: The Horizontal Sync Signal alone off, the Vertical Sync Signal
alone off, or both signals off.
POWER MANAGEMENT
The power saving mode complies with the VESA Display Power Management Signaling standard. Each state of power management shall be
activated by the host computer terminating the appropriate sync signals. Blanking the video must precede termination of the sync signals. The
elapsed time counter shall also be controlled by the host computer. Reactivation of the monitor shall be accomplished from the host computer by
re-establishing the normal sync signal.
TIMING SPECIFICATION
SELF DIAGNOSIS FUNCTION
When a failure occurs, the STANDBY/TIMER lamp will flash a set number of times to indicate the possible cause of the problem. If there is more
than one error, the lamp will identify the first of the problem areas.
1
2
3
5
4
Status
Area of Failure
LED Indication
Amber (0.5 second) / Off (0.5 second)
Amber (0.5 second) / Off (1.5 second)
+B
Horizontal/Vertical Deflection Failure
Thermal Protector
ABL Protector
HV Failure
Failure 1
Failure 2
Failure 3
Failure 4
Aging/Self Test
6
Out of scan range
Amber (1.5 second) / Off (0.5 second)
Green (0.5 second) / Off (0.5 second)
Green (OSD Indication)
Amber (0.25 second) / Off (0.25 second)
Amber (0.25 second) / Off (1.25 second)
Amber (0.5 second) / Off (0.5 second)
Aging Mode (Video Aging):
During Power Save, press MENU button for longer than 2 seconds.
Self Test (OSD Color Bar):
During Power Save, push up Control button for longer than 2 seconds.
Reliability Check Mode:
During Power Save, push down Control button for longer than 2 seconds.
MODE
123
Resolution (H x V)
640 X 480
1280 X 1024
1600 X 1200
Dot Clock (MHz)
25.175
157.500
229.500
HORIZONTAL
Hor. Freq. (kHz)
31.469
91.146
106.250
H-Total
31.778
10.971
9.412
H-Blanking
6.356
2.844
2.440
H-Front Porch
0.636
0.406
0.279
H-Sync.
3.813
1.016
0.837
H-Back Porch
1.907
1.422
1.325
H-Active
25.422
8.127
6.972
(µsec)
VERTICAL
Ver. Freq. (Hz)
59.940
85.024
85.000
V-Total
525
1072
1250
V-Blanking
45
48
V-Front Porch
10
V-Sync.
V-Back Porch
33
2
46
V-Active
480
1
44
3
50
1
3
1024
1200
(lines)
SYNC.
Int (G)
Ext (H/V)/Polarity
YES -/-
YES +/+
YES +/+
Ext (C/S)/Polarity
NO
NO
NO
NO
NO
NO
Int/Non Int
NON INT
NON INT
NON INT


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CPD-G420
WARNINGS AND CAUTIONS
CAUTION
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.
WARNING!!
An isolation transformer should be used during any service to avoid possible shock hazard, because of live chassis. The chassis of this
receiver is directly connected to the ac power line.
! 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 appear as shown in this manual or in supplements published
by Sony. Circuit adjustments that are critical for safe operation are identified in this manual. Follow these procedures whenever critical
components are replaced or improper operation is suspected.
ATTENTION!!
Apres avoir deconnecte le cap de l'anode, court-circuiter l'anode du tube cathodique et celui de l'anode du cap au chassis metallique de
l'appareil, ou la couche de carbone peinte sur le tube cathodique ou au blindage du tube cathodique.
Afin d'eviter tout risque d'electrocution provenant d'un chássis sous tension, un transformateur d'isolement doit etre utilisé lors de tout
dépannage. Le chássis de ce récepteur est directement raccordé à l'alimentation du secteur.
! ATTENTION AUX COMPOSANTS RELATIFS A LA SECURITE!!
Les composants identifies par une trame et par une marque ! sur les schemas de principe, les vues explosees et les listes de pieces
sont d'une importance critique pour la securite du fonctionnement. Ne les remplacer que par des composants Sony dont le numero de
piece est indique dans le present manuel ou dans des supplements publies par Sony. Les reglages de circuit dont l'importance est
critique pour la securite du fonctionnement sont identifies dans le present manuel. Suivre ces procedures lors de chaque remplacement
de composants critiques, ou lorsqu'un mauvais fonctionnement suspecte.


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CPD-G420
SAFETY CHECK-OUT
After correcting the original service problem, perform the following
safety checks before releasing the set to the customer:
1. Check the area of your repair for unsoldered or poorly soldered
connections. Check the entire board surface for solder splashes and
bridges.
2. Check the interboard wiring to ensure that no wires are "pinched" or
touching 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 transistors,
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.
Leakage Test
The AC leakage from any exposed metal part to earth ground and from
all exposed metal parts to any exposed metal part having a return to
chassis, must not exceed 0.5 mA (500 microamperes). 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
instructions.
2. A battery-operated AC milliampmeter. 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" indication is 0.75
V, so analog meters must have an accurate low voltage scale.
The Simpson's 250 and Sanwa SH-63TRD are examples of
passive VOMs that are suitable. Nearly all battery-operated digital
multimeters that have a 2 VAC range are suitable (see Figure A).
How to Find a Good Earth Ground
A cold-water pipe is a guaranteed earth ground; the cover-plate retaining
screw on most AC outlet boxes is also at earth ground. If the retaining
screw is to be used as your earth ground, verify that it is at ground
by measuring the resistance between it and a cold-water pipe with an
ohmmeter. The reading should be zero ohms.
If a cold-water pipe is not accessible, connect a 60- to 100-watt trouble-
light (not a neon lamp) between the hot side of the receptacle and the
retaining screw. Try both slots, if necessary, to locate the hot side on the
line; the lamp should light at normal brilliance if the screw is at ground
potential (see Figure B).
g
AC Outlet Box
Ohmmeter
Cold-water Pipe
Figure A. Using an AC voltmeter to check AC leakage.
Figure B. Checking for earth ground.
To Exposed Metal
Parts on Set
0.15 µF
1.5 K
AC
Voltmeter
(0.75 V)
Earth Ground