Read Sony GDM-400PS / GDM-400PST Service Manual online
SERVICE MANUAL
SPECIFICATIONS
CHASSIS
MICROFILM
TRINITRON
®
COLOR GRAPHIC DISPLAY
GDM-400PS/400PST
N3
GDM-400PS
US Model
Canadian Model
GDM-400PST
AEP Model
UK Model
Chassis No. SCC-L17A-A
Picture tube
0.25 – 0.27 mm aperture grille pitch
19 inches measured diagonally
90-degree deflection
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
Vertical: Max. 1200 lines
Standard image area
Approx. 330
×
264 mm (w/h)
(13
×
10
1
/
2
inches)
or
Approx. 352
Approx. 352
×
264 mm (w/h)
(13
7
/
8
×
10
1
/
2
inches)
Deflection frequency
Horizontal: 30 to 94 kHz
Vertical: 48 to 160 Hz
Vertical: 48 to 160 Hz
AC input voltage/current
100 to 240 V, 50 – 60 Hz, 1.8 – 1.0 A
Power consumption
Max. 130 W
Dimensions
444
×
467
×
453 mm (w/h/d)
(17
1
/
2
×
18
1
/
2
×
17
7
/
8
inches)
Mass
Approx. 25 kg (55 lb 2 oz)
Supplied accessories
See page 6
N-3 17inch
GDM-400PS/400PST
– 2 –
SAFETY CHECK-OUT
(US Model only)
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.
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.
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.
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.
BOBINE DE DEMAGNETISATION EST ENLEVÉE.
ATTENTION AUX COMPOSANTS RELATIFS À LA
SÉCURITÉ!!
LES COMPOSANTS IDENTIFIÉS PAR UNE TRAME ET
UNE MARQUE
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.
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.
CAUTION ON DAS (ECS) CONNECTOR
•
The connector for DAS (ECS) adjustment is provided inside
the cover shown below. Be careful with an electrical shock
when connecting the connector with the power supplied. Also,
return the removed cover to the home position.
1.5 k W
0.15 µF
AC
Voltmeter
(0.75 V)
Voltmeter
(0.75 V)
To Exposed Metal
Parts on Set
Parts on Set
Earth Ground
Fig. A. Using an AC voltmeter to check AC leakage.
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.
Left side
GDM-400PS/400PST
– 3 –
DIAGNOSIS
Failre
+B failure
Horizontal / Vertical Deflection
failure, Thermal protector
failure, Thermal protector
ABL protector
HV failure
Aging / Self Test
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)
(0.5 sec)
(0.25 sec)
(1.25 sec)
Amber
→
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)
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.
Recovery time
—
Approx. 3 sec.
Approx. 3 sec.
Approx. 10 sec.
—
u
indicator
Green
Green and orange
alternate
alternate
Green and orange
alternate
alternate
Orange
Off
Power consumption
mode
mode
Normal operation
Standby (1st mode)
Suspend (2nd mode)
Active-off (3rd mode)
Power-off
Screen
active
blank
blank
blank
—
Horizontal
sync signal
sync signal
present
absent
present
absent
—
Vertical
sync signal
sync signal
present
present
absent
absent
—
Power consumption
≤
160 W (GDM-500PS)
≤
130 W (GDM-400PS)
≤
100 W (GDM-500PS)
≤
85 W (GDM-400PS)
≤
15 W
≤
5 W
0 W
1
2
3
4
5
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 16.
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 16.
Note
If no video signal is input to the monitor, the “NO INPUT
SIGNAL” message (page 20) 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.
SIGNAL” message (page 20) 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.
POWER SAVING FUNCTION
GDM-400PS/400PST
– 4 –
TIMING SPECIFICATION
MODE AT PRODUCTION
MODE 1
MODE 2
MODE 3
RESOLUTION
738 X 414
1280 X 960
1600 X 1200
CLOCK
28.322 MHZ
148.500 MHZ
202.500 MHZ
-- HORIZONTAL --
H-FREQ
H-FREQ
31.469 kHz
85.938 kHz
93.750 kHz
usec
usec
usec
H. TOTAL
31.777
11.636
10.667
H. BLK
5.720
3.017
2.765
H. FP
0.318
0.431
0.316
H. SYNC
3.813
1.077
0.948
H. BP
1.589
1.508
1.501
H. ACTIV
26.057
8.620
7.901
-- VERTICAL --
V. FREQ(HZ)
V. FREQ(HZ)
70.087 Hz
85.002 Hz
75.000 Hz
lines
lines
lines
V. TOTAL
449
1011
1250
V. BLK
35
51
50
V. FP
5
1
1
V. SYNC
2
3
3
V. BP
28
47
46
V. ACTIV
414
960
1200
-- SYNC --
INT(G)
INT(G)
NO
NO
NO
EXT(H/V)/POLARITY
YES N/P
YES P/P
YES P/P
EXT(CS)/POLARITY
NO
NO
NO
INT/NON INT
NON INT
NON INT
NON INT
97. 10. 24 VER.
