Dell P780 - 17" CRT Display User manual

SPECIFICATIONS
D99CHASSIS
SERVICEMANUAL
P780
P780
Equator Model
Japan Model
N. Hemisphere Model
S. Hemisphere Model
Chassis No. L29K-A
COLOR MONITOR
Picture tube
Video image area
Resolution
Standard image area
Input signal
Video
Sync
0.24-0.25 mm aperture grill pitch
17 inches measured diagonally
90-degree deflection
(16" maximum viewing image)
Approx. 326 X 243 mm (w/h)
(12
7/8
x 9
5/8
inches)
Horizontal: Max. 1280 dots
Vertical: Max. 1024 lines
Approx. 312 x 234 mm (w/h)
(12
1/4
x 9
1/4
inches)
Analog RGB (75 ohms typical)
0.7 Vp-p,
± 5%, Positive
Separate HD/VD,
TTL Polarity Free
External Composite,
TTL Polarity Free (2K ohms impedance)
Power Consumption
Deflection frequency
AC input voltage / current
Dimensions
Mass
Maximum 120W
Minimum 95W
Horizontal: 30 to 85 KHz
Vertical: 48 to 120 Hz
100 to 120 V, 50/60 Hz, 1.7A
220 to 240V, 50/60Hz, 0.9A
414 x 404 x 420mm (w/h/d)
(16
1/4
x 15
7/8
x 16
1/2
inches)
Approx. 18.8 kg (41 lbs. 8 oz.)
Design and specifications are subject to change without notice.

— 2 —
P780
POWER MANAGEMENT
ThepowersavingmodecomplieswiththeVESADisplayPowerManagementSignalingstandard. Each
state of power management shall be activated by the host computer terminating the appropriate sync
signals. Blanking the video must precede termination of the sync signals. The elapsed time counter
shall also be controlled by the host computer. Reactivation of the monitor shall be accomplished from
the host computer by re-establishing the normal sync signal.
TIMING SPECIFICATION
SELF DIAGNOSIS FUNCTION
When a failure occurs, the STANDBY/TIMER lamp will flash a set number of times to indicate the
possible cause of the problem. If there is more than one error, the lamp will identify the first of the
problem areas.
Power consumption Screen Horizontal Vertical Power Recovery time indicator
mode (video) sync signal sync signal consumption
1 Normal operation active yes yes < 120 W -- Green
2 Standby (1st mode) blank no yes < 15 W Approx. 3 sec. Green and Orange
Alternate
3 Suspend (2nd mode) blank yes no < 15 W Approx. 3 sec. Green and Orange
Alternate
4 Active-off (3rd mode) blank no no < 3 W Approx. 10 sec. Orange
5 Power-off -- -- -- 0 W -- Off
Status Area of Failure LED Indication
1 Failure 1 HV or +B Amber (0.5 second)/Off (0.5 second)
2 Failure 2 Amber (1.5 second)/Off (0.5 second)
3 Failure 3 ABL Amber (0.5 second)/Off (1.5 second)
4 Aging/Self Test Amber(0.5 second)/Off (0.5 second)/
Green (0.5 second)/Off (0.5 second)
H Stop or V Stop
MODE 1
Resolution (H x V)
Dot Clock (MHz) 640 x 480 25.175 720 x 400 28.321 640 x 480 31.500
HORIZONTAL
Hor. Freq. (kHz)
H-Total
H-Blanking
H-Front Porch
H-Sync.
H-Back Porch
H-Active
(µsec)
VERTICAL
Ver. Freq. (Hz)
V-Total
V-Blanking
V-Front Porch
V-Sync.
V-Back Porch
V-Active
(lines)
SYNC.
Int (G)
Ext (H/V)/Polarity
Ext (CS)/Polarity
Int/Non Int
31.469
31.778
6.356
0.636
3.813
1.907
25.422
59.940
525
45
10
2
33
480
No
Yes-/-
No
Non Int
640 x 480
36.000 800 x 600 49.500 800 x 600 56.250 1024 x 768
78.750 1024 x 768
94.500 1280 x 1024 135.000 1600 x 1200
31.468
31.779
6.356
0.636
3.178
2.542
25.423
70.084
449
49
13
2
34
400
No
Yes-/+
No
Non Int
37.500
26.667
6.349
0.508
2.032
3.810
20.317
75.000
500
20
1
3
16
480
No
Yes-/-
No
Non Int
43.269
23.111
5.333
1.556
1.556
2.222
17.778
85.008
509
29
1
3
25
480
No
Yes-/-
No
Non Int
46.875
21.333
5.172
0.323
1.616
3.232
16.162
75.000
625
25
1
3
21
600
No
Yes+/+
No
Non Int
53.674
18.631
4.409
0.569
1.138
2.702
14.222
85.061
631
31
1
3
27
600
No
Yes+/+
No
Non Int
60.023
16.660
3.657
0.203
1.219
2.235
13.003
75.029
800
32
1
3
28
768
No
Yes+/+
No
Non Int
68.677
14.561
3.725
0.508
1.016
2.201
10.836
84.997
808
40
1
3
36
768
No
Yes+/+
No
Non Int
79.976
12.504
3.022
0.119
1.067
1.837
9.481
75.025
1066
42
1
3
38
1024
No
Yes+/+
No
Non Int
75.000
13.333
3.457
0.395
1.185
1.877
9.877
60.000
1250
50
1
3
46
1200
No
Yes+/+
No
Non Int
162.000

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P780
TABLE OF CONTENTS
Section Title Page
Safety Check Out Instructions............................................................... 4
1. GENERAL .................................................................................. 5
2. DISASSEMBLY
2-1. Cabinet Removal.......................................................... 10
2-2. Service Position ........................................................... 10
2-3. A and D Board Removal............................................... 10
2-4. Picture Tube Removal...................................................11
3. SAFETY RELATED ADJUSTMENTS............................. 12
4. ADJUSTMENTS..................................................................... 13
5. DIAGRAMS
5-1. Block Diagram .............................................................. 19
5-2. Circuit Boards Location ................................................ 22
5-3. Schematic Diagrams and Printed Wiring Boards ........ 22
1. A Board - Schematic Diagram ................................ 23
2. D Board - Schematic Diagram................................ 27
5-4. Semiconductors............................................................ 33
6. EXPLODED VIEWS
6-1. Chassis......................................................................... 34
6-2. Packing Materials ......................................................... 35
7. ELECTRICAL PARTS LIST ............................................... 37

— 4 —
P780
SAFETY CHECK-OUT
After correcting the original service problem, perform the
following safety checks before releasing the set to the
customer:
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
microampere).Leakage currentcan bemeasured byany oneof
three methods.
WARNING!!
NEVER TURN ON THE POWER IN A CONDITION IN WHICH THE
DEGAUSS COIL HAS BEEN REMOVED.
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY SHADINGAND 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 ENLEVEE.
ATTENTION AUX COMPOSANTS RELATIFS ALA SECURITE!!
LES COMPOSANTS IDENTIFIES PAR UNE TRAME ET PAR UNE
MARQUE SUR LES SCHEMAS DE PRINCIPE, LES VUES
EXPLOSEES ET LES LISTES DE PIECES SONT D'UNE
IMPORTANCE CRITIQUE POUR LA SECURITE DU
FONCTIONNEMENT. NE LES REMPLACER QUE PAR DES
COMPOSANTS SONY DONT LE NUMERO DE PIECE EST
INDIQUE DANS LE PRESENT MANUEL OU DANS DES
SUPPLEMENTS PUBLIES PAR SONY. LES REGLAGES DE
CIRCUIT DONT L'IMPORTANCE EST CRITIQUE POUR LA
SECURITE DU FONCTIONNEMENT SONT IDENTIFIES DANS LE
PRESENT MANUEL. SUIVRE CES PROCEDURES LORS DE
CHAQUE REMPLACEMENT DE COMPOSANTS CRITIQUES, OU
LORSQU'UN MAUVAIS FONTIONNEMENT SUSPECTE.
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,thatwereinstalled during a previous repair.
Point them out to the customer and recommend their
replacement.
5. Lookforparts 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. Checkthe B+ and HV toseeifthey are specified values.
Makesure your instruments areaccurate;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.
1. A commercial leakage tester, such as the Simpson 229 or
RCAWT-540A.Follow the manufacturers'instructionstouse
these instructions.
2. Abattery-operatedACmilliammeter.The DataPrecision245
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"
indicationis 0.75 V,soanalog meters musthavean accurate
low voltage scale.The Simpson's 250and Sanwa SH-63Trd
are examples of passive VOMs that are suitable. Nearly
all battery operated digital multimeters that have a 2V AC
range are suitable. (See FigureA)
Figure A
1.5 k Ω 0.15 µ FAC
Voltmeter
(0.75 V)
To Exposed Metal
Parts on Set
Earth Ground

— 5 —
P780
SECTION 1
GENERAL
The following are partial abstracts from the Operating Instruction Manual. The page numbers shown reflect those of the Operating Instruction Manual.
4
Getting Started
Setup Connect the monitor to your computer system. This monitor will sync to platforms running at horizontal frequencies between 30 and 85 kHz. Step 1 Make sure the computer system is switched off and attach
the video signal cable to the video output of the computer. Step 2 Make sure the computer is switched off and attach the
power cord to the monitor. Then, attach the other end of the power cord to a power outlet.
Step 3 Switch on the monitor and computer. Step 4 Adjust the user controls according to your personal
preference. Installation is complete.
Parts and Controls
1(RESET) button (pages 6, 9)
This button resets the adjustments to the factory settings.
2(BRIGHTNESS) (v/V) buttons (page 5)
These buttons adjust the picture brightness and function as the (v/V) buttons when adjusting other items.
3(MENU) button (page 6)
This button displays the MENU OSD.
46(CONTRAST) (B/b) buttons (page 5)
These buttons adjust the contrast and function as the (B/b)
buttons when adjusting other items.
51(POWER) switch and indicator
This button turns the monitor on and off. The indicator lights up green when the monitor is on, and lights up green and orange when the monitor is in Power Saving mode.
6AC IN connector
This connector provides AC power to the monitor.
7Video input connector (HD15) (page 5)
This connector inputs RGB video signals and SYNC signals.
Computer
to the video output
to a power outlet
Power cord
Front Rear
5
Getting Started Customizing Your Monitor
US
This monitor can be adjusted within the angles shown below. To turn the monitor vertically or horizontally, hold it at the bottom with both hands. 1Press the (BRIGHTNESS) v/V or 6(CONTRAST)
B/b buttons. The BRIGHTNESS/CONTRAST OSD appears.
2To adjust the brightness.
Press the (BRIGHTNESS) v/V buttons. To adjust the contrast. Press the 6(CONTRAST) B/b buttons.
Use of the Tilt/Swivel
Video Connector
Pin No. Signal Pin No. Signal 1 Red video 8 Blue return 2 Green video 9 Not used (no pin) 3 Blue video 10 Ground 4 Ground 11 Ground 5 CPU host ground 12 SDA (serial data) 6 Red ground 13 Horizontal Sync 7 Green return 14 Vertical Sync
15 SCL (serial clock)
90°
5°
90°
15°
12345
987 10
11 12 13 14 15
6
Adjusting the Picture Brightness and Contrast
BRIGHTNESS/CONTRAST
26 26

— 6 —
P780
6
Customizing Your Monitor
The OSD (On-screen Display) System You can adjust most of the monitor’s settings using the OSDs (On- screen Display). All of the OSDs in this illustration aredescribed on the following pages in order. You can access any of these OSDs from the MENU OSD. To adjust monitor settings using the OSDs, follow the steps below: Basic controls: • Use the (MENU) button to display the MENU OSD and to
select menu items.
• Use the (BRIGHTNESS) v/V buttons to highlight menu
items and to adjust settings.
To adjust the monitor settings: 1Press the MENU button to display the MENU OSD. 2Highlight the desired OSD using the BRIGHTNESS buttons and
press the MENU button again.
3If necessary, use the BRIGHTNESS buttons to select a specific
item.
4Adjust the monitor setting using the BRIGHTNESS and
CONTRAST buttons. • To reset the current item to its original setting, press the
(RESET) button while the item’s adjustment OSD is displayed.
5When you finish adjusting the setting, press the MENU button to
return to the MENU OSD. Press the MENU button twice to return to normal viewing. • Resetting: If you press the RESET button while an OSD is
displayed, only the current adjustment item is reset. For additional information on using the reset function, see the “Resetting the Adjustments” section on page 9.
• Each of the adjustment’s OSD automatically disappears after
30 seconds.
Introducing the OSD System
OK
MENU
MENU
EXIT SIZE/CENTER GEOMETRY COLOR CONVERGENCE LANGUAGE OPTION HELP
80.0kHz/ 75Hz
1280 X 1024
1
2 3 4 5 6 7
Horizontal/Vertical frequencies for current input signal
Resolution for current input signal
1SIZE/CENTER 2GEOMETRY 3COLOR
4CONVERGENCE 5LANGUAGE 6OPTION
7HELP
SIZE/CENTER
26 26
GEOMETRY
COLOR
9300K 5000K
26
CONVERGENCE LANGUAGE
ENGLISH FRANÇAIS DEUTSCH ESPAÑOL ITALIANO NEDERLANDS SVENSKA
ON
DEGAUSS
OPTION
HELP
RETURN TO MAIN MENU RECOMMENDED RESOLUTION FLICKER THIN HORIZONTAL LINE DISTORTED SHAPE OUT OF FOCUS DISCOLORATION
7
Customizing Your Monitor
US
1Adjusting the size and centering
of the picture (SIZE/CENTER)
This setting is stored in memory for the current input signal. 1Press the MENU button.
The main MENU appears on the screen.
2Press the v/V buttons to highlight SIZE/
CENTER and press the MENU button again. The SIZE/CENTER menu appears on the screen.
3Press the v/V buttons to select the desired
adjustment item. Then press the 6B/b buttons to adjust the setting. The OSD automatically disappears after about 30 seconds. To close the OSD, press the MENU button again.
Note Adjustment stops when either the horizontal or vertical size reaches its maximum or minimum value. 2Adjusting the shape of the
picture (GEOMETRY)
The GEOMETRY settings allow you to adjust the rotation and shape of the picture. The rotation setting is stored in memory for all input signals. All other settings are stored in memory for the current input signal. 1Press the MENU button.
The main MENU appears on the screen.
2Press the v/V buttons to highlight GEOMETRY
and press the MENU button again. The GEOMETRY menu appears on the screen.
3First press the v/V buttons to select the desired
adjustment item. Then press the 6 B/b buttons to adjust the setting. The OSD automatically disappears after about 30 seconds. To close the OSD, press the MENU button again.
3Adjusting the color of the picture
(COLOR)
The COLOR settings allow you to adjust the picture’s color temperature by changing the color level of the white color field. Colors appear reddish if the temperature is low, and bluish if the temperature is high. This adjustment is useful for matching the monitor’s colors to a printed picture’s colors. This setting is stored in memory for all input signals. 1Press the MENU button.
The main MENU appears on the screen.
2Press the v/V buttons to highlight COLOR and
press the MENU button again. The COLOR menu appears on the screen.
3Press the v/V buttons to select a color
temperature. The preset color temperatures are 9300K and 5000K. Since the default setting is 9300K, the whites change from a bluish hue to a reddish hue as the temperature is lowered to 5000K. You can also fine tune the color temperature by selecting in step 2 above, and using the 6B/b buttons to adjust the color temperature manually. This OSD allows you to adjust the color temperature between 9300K and 5000K. Press the 6B/b buttons to adjust the color temperature. The OSD automatically disappears after about 30 seconds. To close the OSD, press the MENU button again.
Adjusting the Settings
Select To
HORIZONTAL CENTERING shift the picture to the left or
right
VERTICAL CENTERING shift the picture up or down HORIZONTAL SIZING enlarge or reduce the picture
width
VERTICAL SIZING enlarge or reduce the picture
height
ZOOM enlarge or reduce the picture
width and height proportionally
Select To
ROTATION rotate the picture PINCUSHION expand or contract the picture sides PIN BALANCE shift the picture sides to the left or right KEYSTONE adjust the picture width at the top of the
screen
KEY BALANCE shift the picture to the left or right at the
top of the screen
COLOR
9300K 5000K
26

— 7 —
P780
9
Customizing Your Monitor
US
7Using the HELP OSD
1Press the MENU button.
The main MENU appears on the screen.
2Press the v/V buttons to highlight HELP and
press the MENU button again. The HELP OSD appears on the screen.
3Press the v/V to select an option from the HELP
menu, then press the MENU button to view the HELP information.
Resetting the adjustments Navigate through the on-screen menus to select the adjustment item you want to reset, and press the RESET button before the OSD disappears. Press the RESET button when no OSD is displayed on the screen. Note that the following items are not reset by this method: • on-screen menu language (page 8) • on-screen menu position (page 8) Press and hold the reset button for more than two seconds. This resets everything to the factory presets including the input selection.
Note The RESET button does not function when (CONTROL LOCK) is
set to ON.
HELP
RETURN TO MAIN MENU RECOMMENDED RESOLUTION FLICKER THIN HORIZONTAL LINE DISTORTED SHAPE OUT OF FOCUS DISCOLORATION
Resetting a specific adjustment
Resetting all of the adjustments for the current input signal
Resetting all of the adjustment data to the factory presets
8
Customizing Your Monitor
4Adjusting the quality of the
picture (CONVERGENCE)
The CONVERGENCE settings allow you to adjust the quality of the picture by eliminating red or blue shadows around letters, characters and lines. Both settings are stored in memory for all input signals.
1Press the MENU button.
The main MENU appears on the screen.
2Press the v/V buttons to highlight
CONVERGENCE and press the MENU button again. The CONVERGENCE menu appears on the screen.
3Press the 6B/b buttons to adjust the horizontal
convergence, or the v/V buttons to adjust the vertical convergence. The OSD automatically disappears after about 30 seconds. To close the OSD, press the MENU button again.
5Changing the OSD language
(LANGUAGE)
This setting is stored in memory for the current input signal. 1Press the MENU button.
The main MENU appears on the screen.
2Press the v/V buttons to highlight LANGUAGE
and press the MENU button again. The LANGUAGE menu appears on the screen.
3Press the v/V buttons to select the language you
prefer. The OSD automatically disappears after about 30 seconds. To close the OSD, press the MENU button again.
6Additional settings (OPTION) You can manually degauss (demagnetize) the screen, cancel the moire, adjust the OSD horizontal position, adjust the OSD vertical position and lock the controls using the OPTION OSD. 1Press the MENU button.
The main MENU appears on the screen.
2Pressthe v/V buttons to highlight OPTION and
press the MENU button again. The OPTION menu appears on the screen.
3Press the v/V buttons to highlight the desired
adjustment item. Adjust the selected item according to the following instructions. The OSD automatically disappears after about 30 seconds. To close the OSD, press the MENU button again.
Degaussing the monitor The monitor is automatically degaussed (demagnetized) when the power is turned on.
To manually degauss the monitor, first press the
v/V buttons to highlight (MANUAL DEGAUSS).
Then press only the right 6bbutton. The monitor is degaussed for about three seconds. If a second degauss cycle is needed, allow a minimum interval of 20 minutes for the best result.
Adjusting the amount of the moire cancellation
Toadjustthe amount of moirecancellation,firstpress the
v/V buttons to highlight ( MOIRE
CANCEL). Then press the 6B/b buttons to adjust the amount of moire cancellation until the moire effect is at a minimum.
* Moire is a type of natural interference which produces soft, wavy lines on
your screen. It may appear due to interference between the pattern of the picture on the screen and the phosphor pitch pattern of the monitor.
Adjusting the OSD Horizontal Position
To change the horizontal position of the OSD, first press the v/V buttons to highlight (OSD H POSITION). Then press the 6B/b buttons to adjust the horizontal position of the OSD.
Adjusting the OSD Vertical Position
To change the vertical position of the OSD, first press the
v/V buttons to highlight (OSD V
POSITION). Then press the 6B/b buttons to adjust the vertical position of the OSD.
Locking the controls
To protect adjustment data by locking the controls, first press v/V buttons to highlight (CONTROL LOCK). Then press the 6B/b buttons to toggle the Control Lock on or off. Only the 1(power) switch and MENU button will operate.
Example of moire
OSD H POSITION
OPTION
26
OSD V POSITION
OPTION
26
Design and specifications are subject to change without notice. Monitor Information
You can display the model name, serial number and year of manufacture using the INFORMATION OSD. Press and hold the MENU button for 5 seconds. The INFORMATION OSD appears. The INFORMATION OSD includes the model name, serial number and year of manufacture. The OSD automatically disappears after about 30 seconds.
IfThin LinesAppearon Your
Screen (damper wires) The lines you may be seeing on your screen are normal for the Trinitron monitor and are not a malfunction. These are shadows from the damper wires that stabilize the aperture grille,and are most noticeable when the screen’s background is light (usually white). The aperture grille is the essential element that makes a Trinitron picture tube unique by allowing more light to reach the screen, resulting in a brighter, more detailed picture.
INFORMATION MODEL : CPD–24**** MANUFACTURED : 1999–53 SER NO : 1234567
Damper wires
Approx. 6 cm
Approx. 6 cm

— 8 —
P780
12
Additional Information
* If a second degauss cycle is needed, allow a minimum interval of 20 minutes for the best result. A humming noise may be heard, but this is not a malfunction.
Picture is fuzzy • Adjust the brightness and contrast (page 5).
• Degauss the monitor* (page 8). • If CANCEL MOIRE is ON, the picture may become fuzzy. Decrease the moire cancellation
effect (page 8) or set CANCEL MOIRE to OFF.
Picture is ghosting • Eliminate the use of video cable extensions and/or video switch boxes.
• Check that all plugs are firmly seated in their sockets.
Picture is not centered or sized properly • Adjust the size (page 7) or centering (page 7). Note that some video modes do not fill the
screen to the edges.
Edges of the image are curved • Adjust the geometry (page 7). Wavy or elliptical pattern (moire) is visible • Cancel the moire (page 8).
xProblems caused by the connected computer or other equipment • Change your desktop pattern.
Color is not uniform • Degauss the monitor* (page 8). If you place equipment that generates a magnetic field, such
as a speaker, near the monitor, or if you change the direction the monitor faces, color may lose uniformity.
White does not look white • Adjust the color temperature (page 7). Letters and lines show red or blue shadows at the edges • Adjust the convergence (page 8). Monitor buttons do not operate • If the control lock is set to ON, set it to OFF (page 8). A hum is heard right after the power is turned on • This is the normal sound of the auto-degauss cycle. When the power is turned on, the monitor
is automatically degaussed for 3 seconds.
Symptom Check these items
11
Additional Information
Warning Messages If there is something wrong with the input signal, one of the following messages appears. To solve these problems, see the “Troubleshooting” section below.
Troubleshooting If the problem is caused by the connected computer or other equipment, please refer to the connected equipment’s instruction manual. 1Out of Scan Range
This message indicates that the current input signal is not appropriate for the monitor’s specificatons.
2Power Save Mode
This message indicates that the monitor has reduced power consumption.
3Check Signal Cable (self test pattern)
This message indicates that either no input signal is received, or the video cable is not connected.
Symptom Check these items No picture
If the 1(power) indicator is not lit • Check that the power cord is properly connected.
• Check that the 1(power) switch is in the “on” position.
If the CHECK SIGNAL CABLE message appears on the screen, or if the 1(power) indicator is either orange or alternating between green and orange
• Check that the video signal cable is properly connected and all plugs are firmly seated in
their sockets.
• Check that the HD15 video input cable’s pins are not bent or pushed in. xProblems caused by the connected computer or other equipment • The computer is in power saving mode. Try pressing any key on the computer keyboard. • Check that the computer’s power is “on.” • Check that the graphic video board is completely seated in the proper bus slot.
If the OUT OF SCAN RANGE message appears on the screen
xProblems caused by the connected computer or other equipment • Check that the video frequency range is within that specified for the monitor. If you replaced
an old monitor with this monitor, reconnect the old monitor and adjust the frequency range to the following: Horizontal: 30 – 85 kHz Vertical: 48 – 120 Hz
Picture flickers, bounces, oscillates, or is scrambled • Isolate and eliminate any potential sources of electric or magnetic fields such as other
monitors, laser printers, electric fans, fluorescent lighting and televisions.
• Move the monitor away from power lines or place a magnetic shield near the monitor. • Try plugging the monitor into a different AC outlet, preferably on a different circuit. • Try turning the monitor 90°to the left or right. xProblems caused by the connected computer or other equipment • Check your graphic video board manual for the proper monitor setting. • Confirm that the graphics mode (VESA, VGA, etc.) and the frequency of the input signal are
supported by this monitor (Appendix). Even if the frequency is within the proper range, some graphic video boards may have a sync pulse that is too narrow for the monitor to sync correctly.
• Adjust the computer’s refresh rate (vertical frequency) to obtain the best possible picture.
INFORMATION
MONITOR IS WORKING OUT OF SCAN RANGE CHANGE PC SETTING
INFORMATION
MONITOR IS IN POWER SAVE MODE ACTIVATE USING PC
INFORMATION
MONITOR IS WORKING CHECK SIGNAL CABLE RED GREEN BLUE WHITE

— 9 —
P780
Damper Wires
Geometric Distortion Screen not sized or centered
correctly •Perform monitor reset
•Ensure monitor is in proper video mode •Adjust the appropriate geometric control
Moiré (Thin Curvy Lines) Screen has wavy or elliptical
lines Screen has wood grain patterns
•Ensure monitor is in proper video mode •Adjust size first then the moiré controls
Horizontal/Vertical Lines Screen has one or more lines •Perform monitor self test feature check
•Check for bent or broken pins •Horizontal lines could be damper wires
Sync Problems Screen is scrambled or
appears torn •Perform monitor self test feature check
•Check for bent or broken pins •Boot up in the "safe mode"
Audible Noise Problems Has humming sound or high
frequency squeal •Ensure monitor is in proper video mode
•Reposition the monitor •Loud hum when turning on is normal
CRT Scratched Screen has scratches or
smudges •Turn monitor off and clean the screen
Safety Related Issues Visible signs of smoke or
sparks •Do not perform any troubleshooting
steps
•Monitor needs to be replaced
Intermittent Problems Monitor malfunctions on & off •Ensure monitor is in proper video mode
•Perform monitor reset •Perform monitor self test feature check
PRODUCT SPECIFIC SYMPTOMS
SPECIFIC SYMPTOMS WHAT YOU SEE POSSIBLE SOLUTIONS
Two fine lines on the screen. Two fine horizontal lines
(wires) are visible. These damper wires stabilize the vertically striped
aperture grille. This aperture grille allows more light to pass through to the screen giving the Trinitron CRT more color and brightness
The following table contains general information about common monitor problems you might encounter.
COMMON SYMPTOMS WHAT YOU SEE POSSIBLE SOLUTIONS
No Video/LED off No picture, monitor's dead. •Check connection integrity
•Electric outlet verification •Ensure power button depressed fully
No Video/LED on No picture or no brightness •Increase brightness & contrast controls
•Perform monitor self test feature check •Check for bent or broken pins
Poor Focus Picture is fuzzy, blurry or
ghosting •Eliminate video extension cables
•Perform monitor reset •Decrease brightness & contrast controls •Lower video resolution or increase font
size
Shaky/Jittery Video Wavy picture or fine
movement •Perform monitor reset
•Check environmental factors •Relocate and test in other room
Color Purity Problems Color is not uniform
Has color blotches or shades
•Perform degauss •Perform monitor reset •Check environmental factors esp.
woofers
Color Convergence Problems Characters show red or blue
at edges •Perform monitor reset
•Adjust the color convergence controls
Missing Color or Color Flood Entire screen is purple or
yellow Entire screen is red, green or blue
•Perform monitor reset •Perform monitor self test feature check •Check for bent or broken pins •Reseat the video card
Missing Pixels CRT screen has spots, specs
or blemishes on the glass •If the blemish is on the outside of the
glass, try cleaning the CRT screen
Brightness Problems Picture too dim or too bright •Perform monitor reset
•Adjust brightness & contrast controls

— 10 —
P780
2-3. A and D BOARD REMOVAL
2-1. CABINET REMOVAL 2-2. SERVICE POSITION
SECTION 2
DISASSEMBLY
1 When the D-board is
placed in service
position, the Safety Earth
Wire (green and yellow
wire) is disconnected.
2 After service is
completed and the
D-board reinstalled, the
Safety Earth Wire must
be reattached to the
chassis with the proper
screw. This must be
confirmed before any
subsequent procedures
are attempted.
A board
D board
Cabinet
Two screws
(BVTP 4 x 16)
Two claws
PUSH
PUSH
EMI Shield
Four screws
(BVTP) 3 x 8)
Three screws
(BVTP) 3 x 8)
Cable stopper
Five screws
(BVTP 3 x 12)
D board
One screw
(BVTT 4 x 8)
Holder
Aboard
Chassis base

— 11 —
P780
2-4. PICTURE TUBE REMOVAL
1Turn up one side of the rubber cap in
the direction indicated by arrow a . 3When one side of the rubber cap
separates from the anode button,
the anode cap can be removed by
turning the rubber cap and pulling
it in the direction of arrow c .
2Use your thumb to pull the rubber
capfirmly in the directionindicated
by arrow b .
HOW TO HANDLEAN ANODE-CAP
WARNING: High voltage remains in the CRTeven after the power is disconnected. To avoid electric shock, discharge CRT
before attempting to remove the anode cap. Short between anode and CRT coated earth ground strap.
NOTE: After removing the anode, short circuit the anode of the picture tube and the anode cap to either the metal
chassis, CRT shield, or carbon painted on the CRT.
REMOVAL PROCEDURES
1Do not use sharp objects which may cause damage to the
surface of the anode cap.
2Do not squeeze the rubber covering too hard to avoid damag-
ing the anode cap. A material fitting called a shatter-hook ter-
minal is built into the rubber.
3Do not force turn the foot of the rubber cover. This may cause
the shatter-hook terminal to protrude and damage the rubber.
a
b
Anode Button
c
WARNING:
BEFORE REMOVING
THE ANODE CAP
High voltage remains in the CRT even
after the power is disconnected. To
avoid electric shock, discharge CRT
before attempting to remove the anode
cap. Short between anode and CRT
coated earth ground strap.
ANODE CAP REMOVAL
Coated Earth
Ground Strap
Demagnetization coil
Tension spring
Stand
ass'y
(D board)
Aboard
Neck assy
Deflection yoke
Four screws
(Tapping screw 5)
Anode cap
Cushion
Picture tube shield
Two screws
(BVTP 4 x 16)
1
6
9
10
5
4
3
2
7
8

— 12 —
P780
7) Verify the High Voltage as shown above (26.9 KV
±0.4 KV) is within specification. If not, set H. SIZE
data at minimum (-127) and then adjust RV501 on
"D" Board.
8) After adjusting the High Voltage within specification,
put the RV cover on RV501 as shown below and apply
sufficient amount of RTV around RV501.
b) HV Protector Circuit Check
1) Confirm that the voltage between cathode of D517 an
GND is more than 27.5 VDC.
2) Using an external DC Power supply, apply the voltage
shown below between cathode of D517 on "D" and
GND, and confirm that the HV Hold-Down circuit
works. (Raster disappears) Apply DC Voltage: Less than
35.5 VDC
Check Condition
• Input voltage : 120 ±2 VAC
• Input signal : (fH = 80 kHz), White Cross Hatch
• Controls : CONT (max) & BRT (center)
• B+ Voltage : 180 ±3.0 VDC
c) Beam Protector Check (Software logic)
1) Using an external current source, apply < 1.55mA
between pin of FBT (T501) and GND, and confirm
that the raster fades out.
Check Condition
• Input voltage : 120 ±2 VAC
• Input signal : (fH = 80 kHz), White Cross Hatch
• Controls : CONT (max) & BRT (min)
d) B+Voltage Check
1) Input white cross hatch (fH = 80 kHz) signal.
2) CONT (max) & BRT (center)
3) Input voltage: 120 ±2 VAC
Note: Use NF power supply or make sure that
distortion factor is 3% or less.
4) Confirm that the voltage is within the voltage
range shown below.
Standard voltage: 180 ±3.0 VDC
SECTION 3
SAFETY RELATED ADJUSTMENTS
When replacing parts shown in the table below, the
following operational checks must be performed as a
safety precaution against X-ray emissions from the unit.
*Allow the unit to warm up for one minute prior to
checking the following conditions:
a) HV Regulator Check
1) Input white cross hatch signal. (fH = 80 kHz)
2) CONT maximum and BRT center
3) Cut off Screen VR (G2).
4) Input voltage: 120 ±2 VAC
5) Confirm that the voltage is within the voltage range
shown below.
Standard voltage: 26.9 KV ±0.4 KV
6) When replacing components identified by ], make
sure to recheck the High Voltage.
RV501
Part Replaced ( [)
RV501
HV ADJ
Part Replaced ( ])
D board T501, IC501, RV501, R540,
R541, R542, R544, R564, R567,
R568, C532, C534, C539, C553,
C554, C555, C556, C558, C561
HV Regulator
Circuit
D board T501, R510, R543, R547, R549,
R552, R595, D515, D517, C540,
C542, C544, IC607, IC901
HV HOLD
DOWN Circuit
D board T501, R545, R546, R548, R550,
R596, R934, C535, C541,
IC605, IC607, IC901
Beam Current
Protector Circuit

— 13 —
P780
SECTION 4
ADJUSTMENTS
4-1. Landing Rough Adjustment
1. Display the all white pattern.
2. Adjust the contrast to maximum value.
3. Display the plain green pattern.
4. Slide the DY back and roughly adjust the plain green
pattern with the purity magnet so that it is centered on
the screen.
5. Moving the DY forward, adjust so that an entire screen
becomes pure green.
6. Adjust the tilt of DY and tighten lightly with a clamp.
4-2. Landing Fine Adjustment
1. Place the monitor in the Helmholtz coil.
2. Set TLH plate to zero position.
3. Display plain green pattern.
4. Degauss CRT face and iron parts with degauss equipment or
hand-degausser.
5. Perform auto degauss.
6. Attach a wobbling coil to the specified position of CRT neck.
7. Put the sensor of landing checker to CRT face.
8. Adjust purity, DY position and DY tilt.
9. Tighten DY screw.
10. Perform auto degauss.
11. Adjust top and bottom pin by pitching DY up and down with
two wedges so that [a] is equal to [b].
Connect the communication cable of the connector located on the D board on the monitor. Run the service software and then follow the
instructions.
*Allow a 30 minute warm-up period prior to making the following adjustments:
12. If the corner landing is out of specification, use a disk
magnet for the landing correction.
13. If disk magnets were used, perform an auto degauss.
14. Remove the wobbling coil and sensor.
15. Fix the purity magnet on DY with white paint.
4-3. Convergence RoughAdjustment
1. Enter the white crosshatch signal.
2. Roughly adjust the horizontal (H.STAT) and vertical
(V.STAT) convergence at four-pole magnet.
3. Roughly adjust HMC and VMC at six-pole magnet.
4-4.
Convergence and V. Key (H. Trp) Fine Adjustment
CRT
Neck Ass’y
A Board
Purity
Magnet XCV VR
6-pole
Mg TLH Plate
DY
4-pole
Mg
H-Trp VR TLV VR
YCV VR
1. Display crosshatch pattern with green lines and black field.
2. Adjust V. Key (=H. Trapezoid) with H-Trp VR so that [a]
is equal to [b].
3. Change "CONV_OFF_NDX" to "7".
IBM AT Computer
as a Jig
1-690-391-21
1A-1500-819-A
Interface Unit
2
D-sub
(9 Pin [female]) mini Din (8Pin) 4 Pin
3-702-691-01
Connector Attachment
3
To BUS CONNECTOR
4 Pin 4 Pin
* The parts above ( ~ ) are necessary for DAS adjustment.
3
1

— 14 —
P780
4. Display crosshatch pattern with red and blue lines and
black field.
5. Adjust H.STAT and V.STAT with 4 pole magnet. Use 4
pole magnet, not "HSTAT" and "VSTAT".
4 Pole Magnet
6. Display crosshatch pattern with white lines and black field.
7. Adjust HMC and VMC with 6 pole magnet.
6 Pole Magnet
8. Display crosshatch pattern with red and blue lines and
black field.
9. If necessary, repeat steps 5-8.
10. Change "CONV_OFF_NDX" to "3".
11. Adjust H.TILT with TLH plate.
TLH movement
12. Adjust XCV with XCV VR.
XCV movement
13. Adjust YCH with YCH VR.
YCH movement
RB
14. Adjust V.TILT with TLV VR.
4-5. Vertical and Horizontal Position and
Size Specification
4-6. Focus adjustment
Adjust focus (V) and focus (H) for optimum focus.
Focus (V)
Focus (H)
FBT
TLV movement
15. If necessary, repeat steps 3-14 to make the
optimum condition for the entire screen.
16. Fix 4-pole magnet, 6-pole magnet and XCV VR
with white paint
Zero Position NECK Ass'y
R B B R
bb
a
a
A
B
fH> 60kHz fH< kHz
a = 2.0 mm 2.4 mm
b = 2.0 mm 2.4 mm
A B
234 312

— 15 —
P780
4-7. Digital Convergence Adjustment
Convergence (Low) Mode
1. Adjust the H.STAT and V.STAT with "HSTAT" and
"VSTAT".
A. Horizontal Convergence
9
11
19
17
1
10
12
20
18
2
5
6
CBH-T-L-LO
MBH-T-L-LO
APH-L-LO
MBH-B-L-LO
CBH-B-L-LO
CBH-T-R-LO
MBH-T-R-LO
APH-R-LO
MBH-B-R-LO
CBH-B-R-LO
YBH-T-LO
YBH-B-LO
HSTAT
Adjust each misconvergence point in sequence.
B. Vertical Convergence
13
15
23
21
3
14
16
24
22
4
7
8
CCV-T-L-LO
MCV-T-L-LO
XBV-L-LO
MCV-B-L-LO
CCV-B-L-LO
CCV-T-R-LO
MCV-T-R-LO
XBV-R-LO
MCV-B-R-LO
CCV-B-R-LO
V STAT-T-LO
V STAT-B-LO
VSTAT
Adjust each misconvergence point in sequence.
2. Repeat the procedure of Aand B so that the convergence
of the entire screen is within the specification.
Convergence (High) Mode
1. Adjust the H.STAT and V.STAT with "HSTAT-HI" and
"VSTAT-HI".
A. Horizontal Convergence
9
11
19
17
1
10
12
20
18
2
5
6
CBH-T-L-HI
MBH-T-L-HI
APH-L-HI
MBH-B-L-HI
CBH-B-L-HI
CBH-T-R-LHI
MBH-T-R-HI
APH-R-HI
MBH-B-R-HI
CBH-B-R-HI
YBH-T-HI
YBH-B-HI
HSTAT-HI
Adjust each misconvergence point in sequence.
B. Vertical Convergence
13
15
23
21
3
14
16
24
22
4
7
8
CCV-T-L-HI
MCV-T-L-HI
XBV-L-HI
MCV-B-L-HI
CCV-B-L-HI
CCV-T-R-HI
MCV-T-R-HI
XBV-R-HI
MCV-B-R-HI
CCV-B-R-HI
V STAT-T-HI
V STAT-B-HI
VSTAT-HI
Adjust each misconvergence point in sequence.
2. Repeat the procedure of A and B so that the convergence
of the entire screen is within the specification.
4-8.Convergence Specification
B
C
A
312 mm
234 mm
A Zone:
Primary Mode
H: <0.25mm
V: <0.2mm
B Zone:
Primary Mode
H: <0.3mm
V: <0.3mm
C Zone:
Primary Mode
H: <0.35mm
V: <0.35mm
Others
H: <0.3mm
V: <0.3mm
Others
H: <0.4mm
V: <0.4mm
Others
H: <0.4mm
V: <0.4mm

— 16 —
P780
NOTES:

— 17 —
P780
NOTES:

— 18 —
P780
NOTES:

P780
— 22 —— 21 —— 20 —— 19 —
5-1. BLOCK DIAGRAM
5-2. CIRCUIT BOARDS LOCATION
Note:
• All capacitors are in µF unless otherwise noted. pF: µµF
50 WV or less are not indicated except for electrolytic.
• Indication of resistance, which does not have one for rating
electrical power, is as follows.
• All resistors are in ohms.
• f: nonflammable resistor.
• :fusible resistor.
•∆: internal component.
•p:panel designation and adjustment for repair.
• e : earth-ground.
• E : earth-chassis.
• The components identified by [in this basic schematic
diagram have been carefully factory-selected for each set
in order to satisfy regulations regarding X-ray radiation.
Should replacement be required, replace only with the
value originally used.
• When replacing components identified by ],make the necessary
adjustments by using RV501 ([)as indicated. (See page 12)
• Allvariable and adjustable resistorshave characteristic curve B,
unless otherwise noted.
•When replacing parts shown in the table below,
be sure to perform the safety related adjustment.
Pitch: 5 mm
Rating electrical power 1/4 W (CHIP: 1/10 W)
Note: The components identified by shading and
mark ¡ are critical for safety. Replace only
with part number specified.
Note: Les composants identifies per un trame et une
marque ¡sont critiques pour la securite. Ne les
remplacer que par une piece portant le numero specifie.
5-3. SCHEMATIC DIAGRAMS AND PRINTED WIRING BOARDS
SECTION 5
DIAGRAMS
Part Replaced ( )
RV501
HV ADJ
Part Replaced ( )
D board T501, IC501, RV501, R540,
R541, R542, R544, R564, R567,
R568, C532, C534, C539, C553,
C554, C555, C556, C558, C561
HV Regulator
Circuit
D board T501, R510, R543, R547, R549,
R552, R595, D515, D517, C540,
C542, C544, IC607, IC901
HV HOLD
DOWN Circuit
D board T501, R545, R546, R548, R550,
R596, R934, C535, C541,
IC605, IC607, IC901
Beam Current
Protector Circuit
•All voltages are in volts.
•Readings are taken with a 10 ΜΩ digital multimeter
•Readings are taken with a color-bar signal input.
•Voltage variations may be noted due to normal
production tolerances.
•* : Cannot be measured.
•Circled numbers are waveform references.
•: B +bus.
•: B - bus.
FOLDOUT 1 8/6/99, 8:44 AM1

P780
A BOARD SCHEMATIC DIAGRAM
— 25 —— 24 —— 23 —
Schematic diagrams
Block diagram
Aboard
1
A
B
C
D
E
F
G
H
I
J
K
L
2345678910111213141516171819
12 3
1.1 Vp-p (H) 1.1Vp-p (H) 1.2Vp-p (H)
4 5 6
4.1 Vp-p (H) 4.0 Vp-p (H) 4.6 Vp-p (H)
7 8 9
59.3 Vp-p (H) 56.5 Vp-p (H) 58.7 Vp-p (H)
A BOARD WAVEFORMS
12
11
10
54.0 Vp-p (H) 52.2 Vp-p (H) 54.0 Vp-p (H)
A[ VIDEO ]
— 22 —
1
A
B
C
D
E
F
2345678
NOTE:
Portions of this circuit marked as shown are high
voltage areas. Use care to prevent electric shocks
during inspection or repair.
— 26 —
A BOARD LOCATOR LIST
DIODE D105 A-5 IC
D001 E-8 D106 B-5 IC001 B-4
D002 E-2 D111 E-2 IC002 A-6
D003 E-2 D204 B-6 IC003 B-2
D004 E-2 D205 B-6 IC004 C-7
D005 F-6 D206 E-3 IC005 E-7
D007 F-5 D211 E-3 IC006 D-2
D008 F-5 D304 B-6
TRANSISTOR
D014 D-7 D305 B-7 Q001 D-7
D015 E-2 D306 B-6 Q006 C -2
D104 B-6 D311 E-3
A BOARD IC VOLTAGE LIST
IC001 10 3.0 21 3.3 IC002 9 2.1 6 5.0 IC004 10 N C 7 10.4 6 4.6
pin volt 11 2.0 22 11.9 pin volt 10 11.8 7 4.1 pin volt 11 178.4 8 11.6 7 GN D
1 4.0 12 0.2 23 GND 1 50.5 11 2.2 8 4.6 1 GND
IC005 IC006 8 0.3
2 4.6 13 0 24 2.1 2 GN D
IC003 9 5.0 2 11.9 pin volt pin volt 9 0.3
3 3.0 14 0 25 3.3 3 49.8 pin volt 10 0 3 4.8 1 NC 1 N C 10 4.6
4 2.6 15 0 26 GND 4 GND 1 0.5 11 N C 4 4.8 2 NC 2 0 11 GN D
5 2.6 16 11.9 27 2.3 5 49.7 2 1.1 12 0 5 4.8 3 N C 3 0 12 GND
6 3.2 17 0 28 3.3 6 78.7 3 1.1 13 0 6 NC 4 GN D 4 0.5 13 NC
7 2.0 18 0.9 29 11.9 7 GN D 4 5 .0 14 0 7 93.7 5 3.2 5 4.6 14 4.9
8 4.8 19 GND 30 2.6 8 2.1 5 3.6 15 0 8 94.0 6 3.0
All voltages in V
9 2.0 20 2.2 16 GND 9 101.8
A BOARD TRANSISTOR
VOLTAGE LIST
BCE
Q001 11.4 505 10.9
Q006 0.3 3.6 GN D
All voltages are in V
FOLDOUT 2 8/6/99, 10:42 AM2