SONY CPDG420 without LC - Service Manual Immediate Download

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CHASSIS

SERVICE MANUAL

SPECIFICATIONS

CPD-G420

[with LCC]

CR1

S. Hemisphere Model

Equator Model

Chassis No. SCC-L33C-A

TRINITRON® COLOR COMPUTER DISPLAY

CRT

0.24 mm aperture grille pitch

19 inches measured diagonally

90-degree deflection

FD Trinitron

Viewable image size

Approx. 365

× 274 mm (w/h)

(143/8

× 107/8 inches)

18.0" viewing image

Resolution

Maximum

Horizontal: 1920 dots

Vertical: 1440 lines

Recommended

Horizontal: 1280 dots

Vertical: 1024 lines

Input signal levels

Video signal

Analog RGB: 0.700 Vp-p

(positive), 75

SYNC signal

H/V separate or composite sync:

TTL 2 k

, Polarity free

Sync on Green: 0.3 Vp-p

(negative)

Standard image area

Approx. 352

× 264 mm (w/h)

(137/8

× 101/2 inches)

Approx. 330

× 264 mm (w/h)

(13

× 101/2 inches)

Deflection frequency*

Horizontal: 30 to 110 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. 130 W (with no USB devices

connected)

Dimensions

Approx. 451

× 471 × 461 mm (w/h/d)

(177/8

× 185/8 × 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 will automatically

provide an optimal image for the screen.

Design and specifications are subject to change without notice.

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CPD-G420

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 microam-

peres).

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)

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

Voltmeter

(0.75 V)

To Exposed Metal

Parts on Set

Earth Ground

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.

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CPD-G420

POWER SAVING FUNCTION

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)

Amber

Off

(1.5 sec)

(0.5 sec)

Amber

Off

(0.5 sec)

(1.5 sec)

Amber

Off

Amber

Off

(0.25 sec)

(1.25 sec)

Amber

Off

Green

Off

(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, push up Control button for longer than 2 second.

Reliability Check Mode

: During Power Save, push down Control button for longer than 2 second.

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.

Figures reflect power consumption when no USB compatible

peripherals are connected to the monitor.

** 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 a few seconds, the monitor enters power saving

mode.

*** "Deep sleep" is power saving mode defined by the Environmental

Protection Agency.

Power mode

Power

consumption*

! (power)

indicator

normal

operation

135 W (CPD-G520)

130 W (CPD-G420)

green

active off**

(deep sleep)***

3 W

orange

power off

Approx. 0 W

off

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CPD-G420

TIMING SPECIFICATION

MODE AT PRODUCTION

MODE 1

MODE 2

MODE 3

RESOLUTION

640 X 480

1280 X 1024

1600 X 1200

CLOCK

25.175 MHz

157.500 MHz

229.500 MHz

-- HORIZONTAL --

H-FREQ

31.469 kHz

91.146 kHz

106.250 kHz

usec

H. TOTAL

31.778

10.971

9.412

H. BLK

6.356

2.844

2.440

H. FP

0.636

0.406

0.279

H. SYNC

3.813

1.016

0.837

H. BP

1.907

1.422

1.325

H. ACTIV

25.422

8.127

6.972

-- VERTICAL --

V. FREQ (HZ)

59.940 Hz

85.024 Hz

85.000 Hz

lines

V. TOTAL

525

1072

1250

V. BLK

V. FP

V. SYNC

V. BP

V. ACTIV

480

1024

1200

-- SYNC --

INT(G)

EXT (H/V) /POLARITY

YES N/N

YES P/P

EXT (CS) /POLARITY

INT/NON INT

NON INT

2000.8.9 VER.

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CPD-G420

TABLE OF CONTENTS

Section

Title

Page

1. GENERAL ................................................................. 1-1

2. DISASSEMBLY

2-1.

Cabinet Removal ............................................... 2-1

2-2.

A1 Board (C BLOCK) Removal ....................... 2-2

2-3.

A1 Board, US Board Removal .......................... 2-2

2-4.

Bezel Assembly, H1 Board Removal ............... 2-3

2-5.

D Board Removal .............................................. 2-3

2-6.

Service Position .................................................. 2-4

2-7.

Picture Tube Removal ........................................ 2-5

2-8.

Harness Location ............................................... 2-6

3. SAFETY RELATED ADJUSTMENT ............. 3-1

4. ADJUSTMENTS ..................................................... 4-1

5. DIAGRAMS

5-1.

Block Diagrams .................................................. 5-1

5-2.

Frame Schematic Diagram ................................. 5-7

5-3.

Circuit Boards Location ..................................... 5-9

5-4.

Schematic Diagrams and Printed Wiring

Boards ................................................................. 5-9

(1)

Schematic Diagram of A1 Board ...................... 5-11

(2)

Schematic Diagram of US Board ...................... 5-15

(3)

Schematic Diagram of DA Board ..................... 5-17

(4)

Schematic Diagram of N Board ........................ 5-19

(5)

Schematic Diagrams of

D (

a, b, c) Board ........................................ 5-21

(6)

Schematic Diagram of H1 Board ....................... 5-29

(7)

Schematic Diagram of L2 Board ....................... 5-31

5-5.

Semiconductors ................................................. 5-33

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