DOWNLOAD Sony GDM-90W10 Service Manual ↓ Size: 1.14 MB | Pages: 50 in PDF or view online for FREE

Model
GDM-90W10
Pages
50
Size
1.14 MB
Type
PDF
Document
Service Manual
Brand
Device
Monitor
File
gdm-90w10.pdf
Date

Sony GDM-90W10 Service Manual ▷ View online

CHASSIS
SERVICE MANUAL
MICROFILM
SPECIFICATIONS
W1
COLOR GRAPHIC DISPLAY
GDM-90W10
N. Hemisphere Model
Chassis No. SCC-K49C-A
– 2 –
GDM-90W10
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
Fig. A. Using an AC voltmeter to check AC leakage.
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-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.
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 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 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.
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 CRITIQUES, OU LORSQU’UN MAUVAIS
FONCTIONNE-MENT EST SUSPECTÉ.
– 3 –
GDM-90W10
PRIMARY MODE
Primary
MODE AT PRODUCTION
MODE1
MODE2
MODE3
MODE4
MODE5
RESOLUTION
1920 X 1200
1600 X 1000
1600 X 1000
1440 X 900
1280 X 800
CLOCK
219.375 MHz
170.100 MHz
135.000 MHz
135.000 MHz
101.250 MHz
 — HORIZONTAL —
H-FREQ
87.192 kHz
79.934 kHz
68.598 kHz
71.809 kHz
64.490 kHz
µ
sec
µ
sec
µ
sec
µ
sec
µ
sec
H. TOTAL
11.469
12.510
14.578
13.926
15.506
H. BLK
2.717
3.104
2.726
3.259
2.864
H. FP
0.109
0.188
0.296
0.296
0.198
H. SYNC
1.039
1.270
1.007
1.185
1.126
H. BP
1.568
1.646
1.422
1.778
1.541
H. ACTIV
8.752
9.406
11.852
10.667
12.642
  — VERTICAL —
V. FREQ(HZ)
70.316 Hz
76.055 Hz
66.023 Hz
76.068 Hz
76.230 Hz
lines
lines
lines
lines
lines
V. TOTAL
1240
1051
1039
944
846
V. BLK
40
51
39
44
46
V.  FP
1
2
2
2
3
V. SYNC
3
3
5
3
7
V. BP
36
46
32
39
36
V. ACTIV
1200
1000
1000
900
800
 — SYNC  —
INT(G)
NO
NO
NO
NO
NO
EXT(H/V)/POLARITY
NO
NO
NO
NO
NO
EXT(CS)/POLARITY
YES N
YES N
YES N
YES N
YES N
INT/NON INT
NON INT
NON INT
NON INT
NON INT
NON INT
96.11.29 VER.
POWER  SAVING  FUNCTION
This monitor is capable of three states of reduced power consumption. By sensing the absence of video signals and one or both sync signals
coming from the host computer, it will reduce power consumption as follows.
Recovery time
Approx. 3 sec.
Approx. 3 sec.
Approx. 10 sec.
Power consumption
 200 W
 140 W
 15 W
 8 W
0 W
Power consumption
state
1 Normal operation
2 Standby (1st state)
3 Suspend (2nd state)
4 Active-off (3rd state)
5 Power-off
u
 power indicator
Green on
Green on
Green on
Off
Off
Failure
HV, +B failure
Horizontal/Vertical deflection failure, thermal
protector
ABL protector
Aging/Self Test
Power Saving LED
Off
Blink Amber
Blink Amber
Off
Power LED
Blink Amber
Off
Blink Amber
Amber (0.5 sec) 
Off (0.5 sec) 
Green (0.5 sec) 
Off (0.5 sec) 
DIAGNOSIS
Aging Mode: Video aging
During Power Save, press “OPTION” Key for longer than 2 seconds.
Self Test: OSD color-bar indication
During Power Save, press “CONTRAST+” Key for longer than 2 seconds.
Self Test: OSD All White indication
During Poewr Save, press “COLOR” key for longer than 2 seconds.
@
 power saving indicator
Off
Orange on
Orange on
Orange on
Off
TIMING  SPECIFICATION
– 4 –
GDM-90W10
TABLE  OF  CONTENTS
Section
Title
Page
1. GENERAL
...................................................................
5
2. DISASSEMBLY
2-1.
Cabinet Removal ................................................. 14
2-2.
D Board Removal ................................................ 14
2-3.
G Board Removal ................................................. 15
2-4.
A Board Removal ................................................. 15
2-5.
M Board Removal ................................................ 16
2-6.
L Board Removal ................................................. 16
2-7.
Service Position .................................................... 17
2-8.
Harness Location
(1) D Block Side ....................................................... 17
(2) G Block Side ....................................................... 18
2-9.
H1, H2 and J Boards Removal ............................. 18
2-10. Picture Tube Removal ......................................... 19
3. SAFETY  RELATED  ADJUSTMENT
............. 20
4. ADJUSTMENTS
...................................................... 21
5. DIAGRAMS
5-1.
Block Diagrams ................................................... 23
5-2.
Frame Schematic Diagram .................................. 29
5-3.
Circuit Boards Location ...................................... 31
5-4.
Schematic Diagrams and Printed Wiring Boards ... 31
(1) Schematic Diagram of D Board .......................... 35
(2) Schematic Diagrams of G, GA, GB and
J Boards ........................................................... 39
(3) Schematic Diagrams of H1, H2, L and
M Boards ......................................................... 43
(4) Schematic Diagram of A Board .......................... 47
5-5.
Semiconductors ................................................... 54
6. EXPLODED  VIEWS
6-1.
Chassis ................................................................. 56
6-2.
Picture Tube ........................................................ 57
6-3.
Packing Materials ................................................ 58
7. ELECTRICAL  PARTS  LIST
............................ 59
Page of 50
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Sony GDM-90W10 Service Manual ▷ Download

  • DOWNLOAD Sony GDM-90W10 Service Manual ↓ Size: 1.14 MB | Pages: 50 in PDF or view online for FREE
  • Here you can View online or download the Service Manual for the Sony GDM-90W10 in PDF for free, which will help you to disassemble, recover, fix and repair Sony GDM-90W10 Monitor. Information contained in Sony GDM-90W10 Service Manual (repair manual) includes:
  • Disassembly, troubleshooting, maintenance, adjustment, installation and setup instructions.
  • Schematics, Circuit, Wiring and Block diagrams.
  • Printed wiring boards (PWB) and printed circuit boards (PCB).
  • Exploded View and Parts List.