Sony CPD-G520P User manual

CHASSIS
SERVICE MANUAL
SPECIFICATIONS
CPD-G520P
CR1
US Model
Canadian Model
Chassis No. SCC-L45B-A
TRINITRON ® COLOR COMPUTER DISPLAY
CRT 0.24 mm aperture grille pitch
21 inches measured diagonally
90-degree deflection
FD Trinitron
Viewable image size Approx. 403.8 ×302.2 mm (w/h)
(16 ×12 inches)
19.8" viewing image
Resolution
Maximum Horizontal: 2048 dots
Vertical: 1536 lines
Recommended Horizontal: 1600 dots
Vertical: 1200 lines
Input signal levels Video signal
Analog RGB: 0.700 Vp-p
(positive), 75 Ω
SYNC signal
H/V separate or composite sync:
TTL 2 kΩ, Polarity free
Sync on Green: 0.3 Vp-p
(negative)
Standard image area Approx. 388 ×291 mm (w/h)
(15 3/
8 ×11 1/ 2 inches)
or
Approx. 364 ×291 mm (w/h)
(14 3/
8 ×11 1/ 2 inches)
Deflection frequency* Horizontal: 30 to 130 kHz
Vertical: 48 to 170 Hz
AC input voltage/current 100 to 240 V, 50 – 60 Hz, 2.0 – 1.0 A
Power consumption Approx.135W(withnoUSBdevices
connected)
Dimensions Approx. 497 ×499 ×487 mm (w/h/d)
(19 3/
4 ×19 ×19 1/ 5
1/
2 inches)
Mass Approx. 30 kg (66 lb 2 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 will automatically
provide an optimal image for the screen.
Design and specifications are subject to change without notice.

CPD-G520P (E) 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 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 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”indication 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)
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
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 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.
Fig. A. Using an AC voltmeter to check AC leakage.
1.5 k Ω 0.15 µF
AC
Voltmeter
(0.75 V)
To Exposed Metal
Parts on Set
Earth Ground
SAFETY CHECK-OUT

CPD-G520P (E) 3
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 APPEAR AS SHOWN IN THIS MANUAL OR IN
SUPPLEMENTS 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 IM-
PROPER OPERATION IS SUSPECTED.
AVERTISSEMENT!!
NE JAMAIS METTRE SOUS TENSION QUAND LA BOBINE DE
DEMAGNETISATION EST ENLEVÉE.
ATTENTION AUX COMPOSANTS RELATIFS ÀLA 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 SÉCURITÉDU FONCTIONNEMENT SONT
IDENTIFIÉS DANS LE PRÉSENT MANUEL. SUIVRE CES
PROCÉDURES LORS DE CHAQUE REMPLACEMENT DE
COMPOSANTS CRITIQUES, OU LORSQU’UN MAUVAIS
FONCTIONNEMENT EST SUSPECTÉ.

CPD-G520P (E) 4
POWER SAVING FUNCTION
This monitor meets the power-saving guidelines set by VESA,
ENERGY STAR, and NUTEK. If no signal is input to the
monitor from your computer, the monitor will automatically
reduce power consumption as shown below.
* When your computer enters power saving mode, the input signal is
cut and NO SIGNAL appears on the screen before the monitor enters
active off mode.After afew seconds, themonitorenterspower saving
mode.
** Deep sleep is power saving mode defined by the Environmental
Protection Agency.
Power mode Power consumption !(power)
indicator
normal
operation ≤135 W green
active off*
(deep sleep)** ≤3 W orange
power off Approx. 0 W off

CPD-G520P (E) 5
DIAGNOSIS
Failre
+B failure
Horizontal / Vertical Deflection
failure, Thermal protector
ABL protector
HV failure
Aging / Self Test
Out of scan range
Power LED
Amber →Off
(0.5 sec) (0.5 sec)
Amber →Off
(1.5 sec) (0.5 sec)
Amber →Off
(0.5 sec) (1.5 sec)
Amber →Off →Amber →Off
(0.25 sec) (0.25 sec) (0.25 sec) (1.25 sec)
Amber →Off →Green →Off
(0.5 sec) (0.5 sec) (0.5 sec) (0.5 sec)
Green (OSD indication)
Aging Mode (Video Aging) : During Power Save, press MENU button for longer than 2 second.
Self Test (OSD Color Bar) : During Power Save, hold the control button upward for longer than 2 second.
Reliability Check Mode : During Power Save, hold the control button downward for longer than 2 second.

CPD-G520P (E) 6
TIMING SPECIFICATION
MODE AT PRODUCTION MODE 1 MODE 2 MODE 3 MODE 4
RESOLUTION 640 X 480 1600 X 1200 1920 X 1440 1920 X 1440
CLOCK 25.175 MHz 229.500 MHz 341.000 MHz 297.000 MHz
— HORIZONTAL —
H-FREQ
31.469 kHz 106.250 kHz 128.485 kHz 112.500 kHz
usec usec usec usec
H. TOTAL 31.778 9.412 7.783 8.889
H. BLK 6.356 2.440 2.152 2.424
H. FP 0.636 0.279 0.457 0.485
H. SYNC 3.813 0.837 0.622 0.754
H. BP 1.907 1.325 1.073 1.185
H. ACTIV 25.422 6.972 5.630 6.465
— VERTICAL —
V. FREQ (HZ)
59.940 Hz 85.000 Hz 84.977 Hz 75.000 Hz
lines lines lines lines
V. TOTAL 525 1250 1512 1500
V. BLK 45 50 72 60
V. FP 10 1 1 1
V. SYNC 23 33
V. BP 33 46 68 56
V. ACTIV 480 1200 1440 1440
— SYNC —
INT(G) NO NO NO NO
EXT (H/V) /POLARITY YES N/N YES P/P YES P/P YES N/P
EXT (CS) /POLARITY NO NO NO NO
INT/NON INT NON INT NON INT NON INT NON INT
2000.8.9 VER.

CPD-G520P (E) 7
TABLE OF CONTENTS
Section Title Page Section Title Page
1. DISASSEMBLY
1-1. Cabinet Assembly Removal ............................... 1-1
1-2. A1 Board (C BLOCK) Removal ........................ 1-2
1-3. A1 Board Removal ............................................. 1-3
1-4. Bezel, H2 Board Removal .................................. 1-4
1-5. D Board Removal ............................................... 1-5
1-6. Service Position................................................... 1-6
1-7. Picture Tube Removal......................................... 1-7
1-8. Harness Location ................................................ 1-9
2. SAFETY RELATED ADJUSTMENT ............... 2-1
3. ADJUSTMENTS ...................................................... 3-1
4. DIAGRAMS
4-1. Block Diagrams................................................... 4-1
4-2. Frame Schematic Diagram .................................. 4-4
4-3. Circuit Boards Location ...................................... 4-5
4-4. Schematic Diagrams and Printed Wiring
Boards ................................................................. 4-6
(1) Schematic Diagram of A1 Board ....................... 4-8
(2) Schematic Diagrams of D (a, b, c) Board .. 4-10
(3) Schematic Diagram of DA Board ...................... 4-14
(4) Schematic Diagram of H2 Board ....................... 4-16
(5) Schematic Diagram of L2 Board ........................ 4-18
(6) Schematic Diagram of N Board .......................... 4-20
4-5. Semiconductors .................................................. 4-22
5. EXPLODED VIEWS .............................................. 5-1
5-1. Chassis ............................................................... 5-2
5-2. Picture Tube ...................................................... 5-3
5-3. Packing Materials................................................ 5-4
6. ELECTRICAL PARTS LIST ............................... 6-1

CPD-G520P (E) 1-1
SECTION 1
DISASSEMBLY
1-1. CABINET ASSEMBLY REMOVAL
1
Two screws
(+BVTP 4 x 16)
6
Slide the EMI shield in the direction
of arrow Cand remove four claws.
7
EMI shield
4
Four screws
(+BVTT 4 x 8)
5
Five screws
(+BVTT 4 x 8)
2
Two claws
Bezel Bezel
EMI shield
Cabinet assembly Cabinet assembly
Push in the tip of a screwdriver
about 10mm to unlock the claw.
B
A
C
3
Push the upper side of the cabinet assembly
in the direction of arrow A, disconnect claws,
then remove the cabinet assembly
lifting it up in the direction of arrow B.

CPD-G520P (E) 1-2
1-2. A1 BOARD (C BLOCK) REMOVAL
1
A1 board (C BLOCK)
CN315
CN318
GND
GND

CPD-G520P (E) 1-3
1-3. A1 BOARD REMOVAL
1
Two screws
(+BVTT 4 x 8)
2
Video block assembly
3
Four screws
(+BVTP 3 x 8)
4
Video shield
5
Four screws (HEX)
6
Screw
(+BVTP 3 X 8)
7
Video case
8
A1 board
CN315

CPD-G520P (E) 1-4
1-4. BEZEL, H2 BOARD REMOVAL
2
1
Four tapping screws (5)
3
Bezel
4
Screw
(+BVTP 4 x 16)
4
Screw
(+BVTP 4 x 16)
5
Three screws
(+BVTP 3 x 10)
10
Two claws
8
Menu button
9
H2 board
7
Selector input
6
Control panel assembly
12
Magnetic
MIU-221D sensor
11
L1 blacket
CN1400
CN1500
CN1401
Picture tube shield
Before removing the bezel assembly, secure
the picture tube by attaching two screws to
the picture tube shield at the positions shown
with an arrow (diagonal two places) to prevent
the picture tube from falling.
(Use the screws +BVTT 4 x 8 that fix EMI shield.)

CPD-G520P (E) 1-5
1-5. D BOARD REMOVAL
1
A1 board
(C block)
2
Two screws
(+BVTT 4 x 8)
4
Two screws
(+BVTP 3 x 10)
D board
3
Video block assembly
5
Rear plate assembly
6
Five screws
(+BVTP 3 x 10)
CN315
CN602
CN601
CN1103
CN1601
CN1600
CN1003
CN605
CN701
Connector (4P)
Connector (4P)
CN501
GND
GND
8
Screw (+BVTP 3X10)
7

CPD-G520P (E) 1-6
1
2
4
1
Remove the D board.
D board
2
Remove the Video block assembly.
3
Install the Adaptor board
(XT MOUNT) (A-1391-123-A).
4
Lay the Video block assembly.
Video block assembly
Video block assembly
5
Install the video block assembly.
6
Put a box which is about 15cm in height
under the D board to fix it.
(Please disconnect the CN 701 first.)
D board
Box
3
1-6. SERVICE POSITION

CPD-G520P (E) 1-7
1-7. PICTURE TUBE REMOVAL
4
Picture tube
1
Anode cap (Refer to 1-8)
2
A1 board (C block)
3
Neck assembly
CN1 CN2
CN3
CN2
GND

CPD-G520P (E) 1-8
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.
a
b
c
Anode Button

CPD-G520P (E) 1-9
1-8. HARNESS LOCATION
CN602
CN601 CN604 CN1102
CN312 CN311
CN318
CN319
CN320
CN316
CN315
CN303
CN1103
CN1400
CN1500
CN1401
CN701
CN501
CN1601
CN1600
CN1602
CN2
CN1
CN1
5P
CN3
CN1003
CN904
4P
4P
D board
A1 board
N board
L2 board
Magnetic sensor
H2 board
Picture tube
AC inlet (3P)

CPD-G520P (E) 2-1
SECTION 2
SAFETY RELATED ADJUSTMENT
HV Regulator
Circuit Check
HV Protector
Circuit Check
When replacing or repairing the shown below table, the
following operational checks must be performed as a
safety precaution against X-rays emissions from the unit.
Part Replaced ([)
RV901
HV ADJ
* Confirm one minute after turning on the power.
a) HV Regulator Circuit Check
1) Turn the RV901 slowly, and adjustment so that high
voltage is in the specified range.
[Specification]: 27.00 ±0.05 kV
2) Check that the voltage of D912 cathode on the D
board is 17.0 V or more.
b) HV Protector Circuit Check
1) Using external DC Power Supply, apply the voltage
shown below between cathode of D912 and GND,
and check that the RASTER disappers.
[Specification]: 19.95 + 0.00/–0.05 V
Part Replaced (])
D Board C925, IC901, R901,
R902, R905, R924,
R925, R926, RV901,
T901 (FBT)
•Mounted D Board
D Board C920, C923, D911,
D912, R903, R917,
R918, R919, R920,
R923, T901 (FBT)
•Mounted D Board
N Board IC1001, RB1001
•Mounted N Board
Beam Current
Protector Circuit
Check
Part Replaced (])
D Board C930, D917, R921,
R932, R933, R935,
T901 (FBT)
•Mounted D Board
N Board IC1001, RB1001
•Mounted N Board

CPD-G520P (E) 2-2
c) Beam Current Protector Circuit Check
1) Connect constant current source to a section between
T901 (FBT) qa pin and GND, and check that the
RASTER disappers when the specified current flows
to the qa pin.
[Specification]: 2.12 + 0.00/–0.01 mA

CPD-G520P (E) 3-1
SECTION 3
ADJUSTMENTS
Note:Hand degauss must be used on stand-by or power-off condition.
This model has an automatic earth magnetism correction function by using an earth magnetism sensor and a LCC coil. When
using a hand degauss while monitor (LCC coil) is being operated, it sometimes gets magnetized, and the system may not
work properly as a result.
•Landing Rough Adjustment
1. Display all white pattern (or black dot pattern).
2. Set contrast to 255.
3. Display green plain pattern.
4. Side back DY and roughly adjust green plain pattern to be centered on
the useful screen with Purity Magnet.
5. Adjust DY tilt.
Note:Set ROTATION to 128 and LCC_NS to 128 when adjusting DY tilt.
6.Lightly tighten the DY screw.
•Landing Fine Adjustment
Note: (1) After adjust W/B (9300k), measure the average of IK with all
white video input, while CONTRAST is maximum and
BRIGHTNESS is center. And adjustment shall be made so that the
miss-landing become least after aging 2H with the IK 30% of
measured value shown above.
(2) The magnetic field shall be BH = 0.
(3) When adjusting at other than BH = 0, calculate the shifted value
from BH = 0.
1. Put the monitor in helmholz coil.
2. Set as follows;
LCC_SW = 0 (LCC Correction Current = 0)
FUNCTION_SW bit1 = (Auto Degauss = On)
CONTRAST = 255
3. Display green plain pattern.
4. Degauss the iron part of chassis with a hand degausser and degauss coil.
5. Degauss CRT face with a hand degausser again.
6. Input AC 230V to AC IN and turn the monitor off and on. Then auto-
degauss works.
7. Reset FUNCTION_SW bit1 to 0 (auto-degauss = off)
8. Degauss CRT face with a hand degausser again.
9. Attach wobbling coil to the specified place on CRT neck.
10. Put on landing sensor to CRT face.
11. Set LCC_SW to 12.
12. With landing checker, adjust DY position, purity, DY center and
landing of the 4 corners.
13. Read VX and VY value which are the read out of magnetic sensor, and
write to "LCC_VX_REF" and "LCC_VY_REF".

CPD-G520P (E) 3-2
a
b
cd
<How to place wedge>
Green plain crosshatch pattern
a and b should be equal.
c and d should be equal.
Plaster RTV to both sides for the upper wedge.
Make sure that they settle inside DY.
Plaster RTV to one side for other wedges.
± 6 ± 6 ± 6
± 6 ± 6 ± 6
± 6 ± 6 ± 6
(µm)
10 10 10
10 7 10
10 10 10
(µm)
The red and blue must be within the
specification given right with respect to the
green.
A difference between red and blue must be
within the specification given right.
<Specifications>
Adjust so that the green is within the
specification given right.
4 corner adjust target : within ± 1
0 ± 3 0 ± 7.5 0 ± 3
0 ± 3 0 ± 7.5 0 ± 3
0 ± 3 0 ± 7.5 0 ± 3
(µm)
14. Adjust landing by LCC_NS, LCC_LT, LCC_LB, LCC_RT, and
LCC_RB. Adjustment of registers shall be limited within the following
range.
LCC_NS: 128 ± 15
LCC_LT, LCC_LB, LCC_RT, and LCC_RB: 128 ± 40
Set LCC_SW to 13, and Perform Service Save.
15. Tighten DY screw within specified torque, and auto-degauss.
Note: Torque 22 ± 2 kgcm (2.2 ± 0.2Nm)
16. Adjust the vertical angle of DY to make top and bottom pins equal (a =
b). The horizontal angle shall not be changed (straight). Settle DY
upright without leaning, and insert wedges firmly so that DY shall not
move.
17. Adjust top and bottom pins correction VR.
18. Adjust the horizontal trapezoid distortion by DY horizontal trapezoid
correction VR.
19. Check landing at each corner and in case not in specification, adjust
landing of 4 corners with "LCC_NS", "LCC_LT", "LCC_LB",
"LCC_RT", and "LCC_RB". The limitations of registers are shown
below.
LCC_NS: 128 ± 15
LCC_LT, LCC_LB, LCC_RT, and LCC_RB: 128 ± 40
20. Remove the sensor and wobbling coil.
21. Switch signals to R, G, and B, and then check that the pure colors have
good color purity.
22. Fix purity magnets with white paint.