Dell P992 Manuale utente
CHASSIS
SERVICE MANUAL
SPECIFICATIONS
P992
CRV
US Model
Canadian Model
Chassis No. SCC-L42A-A
AEP Model
Chassis No. SCC-L42E-A
N. Hemisphere Model
S. Hemisphere Model
Equator Model
Japan Model
Chinese Model
Chassis No. SCC-L42B-A
P992 COLOR MONITOR
R
Screen dimensions
Preset Image Size
4:3 Diagonal 17.32 inches (440 mm)
Horizontal 13.86 inches (352 mm)
Vertical 10.39 inches (264 mm)
Viewable Image Size (VIS) Diagonal 17.97 inches (456.4 mm)
Horizontal 14.37 inches (365 mm)
Vertical 10.79 inches (274 mm)
Aperture Grille Pitch 0.24 - 0.25 mm
Deflection angle 90°
Faceplate coating AR Coating
Resolution
Horizontal scan range 30 kHz to 107 kHz (automatic)
Vertical scan range 48 Hz to 170 Hz (automatic)
Optimal preset resolution 1024 x 768 at 85 Hz
Highest preset resolution 1600 x 1200 at 85 Hz
Highest addressable resolution* 1920 x 1200 at 75 Hz
* Addressable means the monitor will sync up to this mode. However, Dell
does not guarantee the image will be sized and centered correctly.
Dell guarantees image size and centering for all preset modes listed in the
following table.
Electrical
Video input signals Analog, 0.7 Vpp, positive at 75 ohm
Synchronization input signals Separate horizontal and vertical; and
composite TTL level, positive or
negative Sync on Green at 0.3 Vp-p
AC input voltage / frequency / 100 to 240 VAC / 50 or 60 Hz ±3 Hz /
current 2.0 A (RMS) at 120 VAC and
1.0 A (RMS) at 220 VAC
Inrush current at 120 V 50 A
Inrush current at 240 V 80 A
Physical Characteristics
Connector type 15-pin D-subminiature
Signal cable type Attached to monitor
Dimensions:
Height 471 mm (18.54 inches)
Width 451 mm (17.76 inches)
Depth 461 mm (18.15 inches)
Weight (monitor only) 25.5 kg (56.1 lb)
Weight (with packaging) 30.0 kg (66.0 lb)
Environmental
Temperature:
Operating 32°to 104°F (0°to 40°C)
Nonoperating -4°to 140°F (-20°to 60°C)
Humidity:
Operating 10% to 80% (noncondensing)
Nonoperating 5% to 90% (noncondensing)
Altitude:
Operating 3,048 m (10,000 ft)
Nonoperating 10,675 m (35,000 ft)
Thermal dissipation 461 BTU/hour (maximum)
427 BTU/hour (typical)
P992 (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
P992 (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 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.LESRÉGLAGESDECIRCUITDONTL’IMPORTANCEEST
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
FONCTIONNEMENT EST SUSPECTÉ.
P992 (E) 4
POWER SAVING FUNCTION
If you have VESA's DPMS compliance display card or software installed in
your PC, the monitor can automatically reduce its power consumption when
not in use. The monitor will automatically "wake up" if the keyboard, mouse
or other input devices are detected. The following table shows the power
consumption and signaling of this automatic power saving feature:
Power Management Definition
VESA's Mode Video H-sync V-sync Power Used LED color
maximum
135 W
ON Active Yes Yes typical Green
125 W
minimum
80 W
Active-OFF Blanked No No < 3 W Amber
OFF* N/A N/A N/A 0 W OFF
This monitor is ENERGY STAR®-compliant and TCO'99 power
management compatible.
*Zero power consumption in OFF mode can only be achieved by
disconnecting the power cable from the monitor.
P992 (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, press BRT/+ button for longer than 2 second.
Reliability Check Mode : During Power Save, press CONT/–button for longer than 2 second.
P992 (E) 6
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 135.000 MHz 229.500 MHz
— HORIZONTAL —
H-FREQ
31.469 kHz 79.976 kHz 106.250 kHz
usec usec usec
H. TOTAL
31.778 12.504 9.412
H. BLK
6.356 3.022 2.440
H. FP
0.636 0.119 0.279
H. SYNC
3.813 1.067 0.837
H. BP
1.907 1.837 1.325
H. ACTIV
25.422 9.481 6.972
— VERTICAL —
V. FREQ (HZ)
59.940 Hz 75.025 Hz 85.000 Hz
lines lines lines
V. TOTAL
525 1066 1250
V. BLK
45 42 50
V. FP
10 1 1
V. SYNC
23 3
V. BP
33 38 46
V. ACTIV
480 1024 1200
— SYNC —
INT(G)
NO NO NO
EXT (H/V) /POLARITY
YES N/N YES P/P YES P/P
EXT (CS) /POLARITY
NO NO NO
INT/NON INT
NON INT NON INT NON INT
2001.6.15 VER.
P992 (E) 7
TABLE OF CONTENTS
Section Title Page Section Title Page
1. DISASSEMBLY
1-1. Cabinet Removal ............................................... 1-1
1-2. A Board (C BLOCK) Removal ......................... 1-2
1-3. A Board Removal .............................................. 1-3
1-4. Bezel Assembly, H4 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 A Board ........................ 4-8
(3) Schematic Diagram of DA Board ..................... 4-14
(4) Schematic Diagram of H4 Board ....................... 4-16
(5) Schematic Diagram of N Board 4-18
4-5. Semiconductors ................................................. 4-20
5. EXPLODED VIEWS
5-1. Chassis ............................................................... 5-2
5-2. Picture Tube ...................................................... 5-3
5-3. Packing Materials ............................................... 5-4
6. ELECTRICAL PARTS LIST ............................ 6-1
(2) Schematic Diagrams of
D (a, b, c) Board ........................................ 4-10
........................
P992 (E) 1-1
SECTION 1
DISASSEMBLY
1-1. CABINET REMOVAL
1
B
A
C
Two screws
(+BVTP 4 x 16)
6
Slide the EMI shield in the direction
of arrow Cand remove four claws.
7
EMI shield
4
Two screws
(+BVTT 3 x 8)
5
Six screws
(+BVTT 4 x 8)
2
Two claws
3
Push the upper side of the cabinet
inthe direction of arrow A, disconnect claws
then remove the cabinet
lifting it up in the direction of arrow B.
Bezel assembly Bezel assembly
EMI shield
Cabinet Cabinet
Push in the tip of a screwdriver
about 10mm to unlock the claw.
P992 (E) 1-2
1-2. A BOARD (C BLOCK) REMOVAL
1
A board
CN315
CN318
GND
GND
P992 (E) 1-3
1-3. A BOARD REMOVAL
Two screws
(+BVTT 4 x 8)
Video block assembly
3
Four screws
(+BVTT 3 x 8)
Screw
(+BVTP 3 X 10)
Video case
CN315
CN313
CN304
CN604
CN1102
1
4
6
A board
5
GND
2
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