Dell P992 User manual

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

P992 (E) 1-4
1-4. BEZEL ASSEMBLY, H4 BOARD REMOVAL
2
1
Four tapping screws (5)
5
Bezel assembly
3
Screw
(+BVTP 4 x 16)
4
Screw
(+BVTP 4 x 16)
Three screws
(+BVTP 3 x 10)
7
H4 board
CN1400
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.)
6

P992 (E) 1-5
1-5. D BOARD REMOVAL
2
A board
(C block)
1
Anode cap
(Refer to 1-8)
3
Two screws
(+BVTT 4 x 8)
7
Two screws
(+BVTT 3 x 8)
Pig tail cover
14
D board
13
PWB bracket
4
Video block assembly
6
Cable with connector
8
Rear plate assembly
Screw (+BVTT 3 x 8)
11
Seven screws
(+BVTP 3 x 10)
12
9
Extension bar
CN315 CN313
CN304
GND
CN600 CN601
CN1103
CN1602
Connector (2P)
CN501
CN701 GND
GND
GND
CN
10
5

P992 (E) 1-6
4
5
7
4
Remove the D board.
D board
5
Remove the Video block assembly.
1
Prepare a connector (10Pin: Black) (1-766-921-11),
cut of the boss on the 10-pin side.
Adaptor board (XT Mount) is reconstructied to use for this set.
2
Remove the connector (17Pin: Black) (CN9997)
from Adaptor board (XT MOUNT) (A-1391-123-A).
3
Install the connector (10Pin: Black) onto XT Mount.
6
Install the Adaptor board
(XT MOUNT) (A-1391-123-A).
7
Lay the Video block assembly.
Video block assembly
Connector (10Pin: Black)
Boss
Connector
(10Pin: Black)
Adoptor board
(XT mount)
Video block assembly
8
Install the video block assembly.
9
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
6
1-6. SERVICE POSITION

P992 (E) 1-7
1-7. PICTURE TUBE REMOVAL
4
Picture tube
1
Anode cap (Refer to 1-8)
2
A board (C block)
3
Neck assembly
CN1
CN
Connector (2p)
GND

P992 (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

P992 (E) 1-9
1-8. HARNESS LOCATION
CN600
CN602
CN601 CN604 CN1102
CN312 CN311
CN313
CN304
CN318
CN319
CN320
CN316
CN315
CN303
CN1
CN
CN1103
CN1400
CN1602
CN701
CN501
CN904
Picture tube
A board
D board
H4 board
AC inlet

P992 (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 ±0.20 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]: 19.85 + 0.00/–0.05 V
Part Replaced (])
D Board C909, IC501, R901,
R902, R906, R910,
R913, 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

P992 (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]: 1.92 + 0.00/–0.01 mA

P992 (E) 3-1
SECTION 3
ADJUSTMENTS
•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 ΣIK 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. With landing checker, adjust DY position, purity, DY center and
landing of the 4 corners.
11. Check landing of the 4 corners, and adjust using magnet if they are not
in the specification.
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
Note:(1) Do not attach more than 2 magnets on one corner.
(2) Attach magnets within the range of 80 - 100 mm from DY.
(3) Be sure to degauss and check when used magnets.
0 ± 3 0 ± 7.5 0 ± 3
0 ± 3 0 ± 7.5 0 ± 3
0 ± 3 0 ± 7.5 0 ± 3
(µm)
± 6 ± 6 ± 6
± 6 ± 6 ± 6
± 6 ± 6 ± 6
(µm)
10 10 10
10 7 10
10 10 10
(µm)

P992 (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.
12. Tighten DY screw within specified torque, and auto-degauss.
Note:Torque 22 ± 2 kgcm (2.2 ± 0.2Nm)
13. 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.
14. Adjust top and bottom pins correction VR.
15. Adjust the horizontal trapezoid distortion by DY horizontal trapezoid
correction VR.
16. Check landing at each corner and in case not in specification, adjust
landing of 4 corners with landing magnet.
17. Remove the sensor and wobbling coil.
18. Switch signals to R, G, and B, and then check that the pure colors have
good color purity.
19. Fix purity magnets with white paint.