Sony MCM-19T1 Schematic

SERVICE MANUAL

MCM-19T1

AEP Model

Chassis No. SCC-L20GA

Picture tube

Video image area

Resolution

Standard image area

Input signal

Video

Sync

SPECIFICA TIONS

0.25 mm aperture grill pitch 19 inches measured diagonally 90-degree deflection

(18" maximum viewing image) Approx. 365 X 274 mm (w/h)

3/8

7/8

x 10

7/8

inches)

1/2

inches)

(14

Horizontal: Max. 1600 dots Vertical: Max. 1200 lines

Approx. 352 x 264 mm (w/h) (13

Analog RGB (75 ohms typical)

0.7 Vp-p, Positive External HD/VD, Composite Polarity Free TTL Video Composite (Sync on Green)

0.3 Vp-p, Negative

D98

Power Consumption

Maximum Nominal

Deflection frequency

AC input voltage /current

Dimensions

Mass

Design and specifications are subject to change without notice.

CHASSIS

125 W, 436 BTU/h 100 W, 300BTU/h

Horizontal: 30 to 96 KHz Vertical: 48 to120 Hz

100 to 120 V, 50/60 Hz, 1.7A 220 to 240V, 50/60Hz, 1.2A

444 x 467 x 455 (w/h/d)

1/2

x 18

1/2

x 18 inches)

(17

Approx. 26 kg (57 lb 5 oz)

COLOR COMPUTER DISPLA Y

MCM-19T1

POWER SAVING FUNCTION

This monitor has three Power Saving modes. By sensing the absence of a video signal from the computer, it reduces power consumption as follows:

Power

State

1 Normal O peration 2 Standby (1st mode) 3 Suspend (2nd mode) 4 Active-off (3rd mode)

5 Power-off 0W — Off 6 Failure modes — — See below

TIMING SPECIFICATION

Ext (H/V)/Polarity

Consumption

≤

130W

≤

15W

≤

15W

≤

MODE 123

Resolution (H x V)

Dot Clock (MHz)

HORIZONTAL

Hor. Freq.(kHz)

H-Total

H-Blanking

H-Fron t Porch

H-Sync.

H-Back Porch

H-Active

(µsec)

VERTICAL

Ver. Freq. (Hz)

V-Total

V-Blan king

V-Front Porch

V-Sync.

V-Back Porch

V-Active

(lines)

SYNC.

Int (G)

Ext (CS)/Polarity

Int/Non Int

NOTE:

Required Recovery

approx. 5 sec. Green and orange alternate approx. 5 sec. Green and orange alternate

approx. 5 sec. Orange

720 x 400

28.321

31.468

31.779

6.356

0.636

3.178

2.542

25.423

70.084 449

400

Yes -/+

Non Int

If no video signal is input to the monitor, the "NO INPUT SIGNAL" message appears. After about 30 seconds, the Power Saving function automatically puts the monitor into active-off mode and the indicator lights up orange. Once the monitor detects horizontal and vertical sync signals, the monitor automatically resumes normal operation mode.

Time Power Indicator

—Greenon

1280 x 960

148.500

85.938

11.636

3.017

0.431

1.077

1.508

8.620

85.002

49 13

Yes +/+

Non Int

1600 x 1200

1011

1 3

960

202.500

93.750

10.667

2.765

0.316

0.948

1.501

7.901

75.000 1250

1 3

1200

Yes +/+

Non Int

— 2 —

1.5 k

Ω

0.15 µF

AC Voltmeter (0.75 V)

To Exposed Metal Parts on Set

Earth Ground

SAFETY CHECK-OUT

MCM-19T1

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 poorlysoldered 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 follows.

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 current can be measured by any one of thr ee methods.

1. A commercial leakage tester, such as the Simpson 229 or RCA WT-540A. Follow the manufacturers' instructions to use these instructions.

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's 250 and 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 Figure A)

WARNING!!

NEVER TURN ON THE POWER IN A CONDITION IN WHICH THE DEGAUSS COIL HAS BEEN REMOVED.

SAFETY-RELATED COMPONENT W ARNING!!

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 P ARTS WHOSE PART NUMBERS APPEAR AS SHOWN IN THIS MANUAL OR IN SUPPLEMENTS PUBLISHED BY SONY. CIRCUIT ADJUSTMENTS THA T ARE CRITICAL FOR SAFE OPERATION ARE IDENTIFIED IN THIS MANUAL. FOLLOW THESE PROCEDURES WHENEVER CRITICAL COMPONENTS ARE REPLACED OR IMPROPER OPERATION IS SUSPECTED.

Figure A

AVERTISSEMENT!!

NE JAMAIS METTRE SOUS TENSION QUAND LA BOBINE DE DEMAGNETISATION EST ENLEVEE.

ATTENTION AUX COMPOSANTS RELATIFS A LA 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 IMPORT ANCE 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.

— 3 —

Section Title Page

1. GENERAL ........................................................................................ 5

2. DISASSEMBLY

2-1. Cabinet Removal ......................................................... 10

2-2. Service Position ........................................................... 1 0

2-3. D, A, H and N Board Removal..................................... 10

2-4. Picture Tube Removal ................................................. 11

3. SAFETY RELA TED ADJUSTMENT ................................................ 12

4. ADJUSTMENTS ............................................................................ 13

5. DIAGRAMS

5-1. Block Diagram ............................................................. 1 9

5-2. Circuit Boards Location ............................................... 2 2

5-3. Schematic Diagrams and Printed Wiring Boards ...... 22

1. D Board - Schematic Diagram .............................. 23

2. A Board - Schematic Diagram ............................... 27

3. N Board - Schematic Diagram .............................. 31

4. H Board - Schematic Diagram .............................. 35

5-4. Semiconductors .......................................................... 37

6. EXPLODED VIEWS

6-1. Chassis ....................................................................... 39

6-2. Packing Materials ........................................................ 40

7. ELECTRICAL PARTS LIST............................................................ 41

The following are partial abstracts from the Operating Instruction Manual.

to a power outlet

Power cord

The page numbers shown reflect those of the Operating Instruction Manual.

SECTION 1

GENERAL

Table of Contents

Precautions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Setup. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Parts and Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

The OSD (On-screen Display) System. . . . . . . . . . . . . 6

Resetting the adjustments . . . . . . . . . . . . . . . . . . . . . 10

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Precautions

Installation

Do not install the monitor in the following places:

• on surfaces (rugs, blankets, etc.) or near materials (curtains, draperies) that may block the ventilation holes

• near heat sources such as radiators or air ducts, or in a place subject to direct sunlight

• in a place subject to severe temperature changes

• in a place subject to mechanical vibration or shock

• on an unstable surface

• near equipment which generates magnetism, such as a transformer or high voltage power lines

• near or on an electrically charged metal surface

Maintenance

• Clean the screen with a soft cloth. If you use a glass cleaning liquid, do not use any type of cleaner containing an anti-static solution or similar additive as this may scratch the screen’s coating.

• Do not rub, touch, or tap the surface of the screen with sharp or abrasive items such as a ball point pen or screwdriver. This type of contact may result in a scratched picture tube.

• Clean the cabinet, panel and controls with a soft cloth lightly moistened with a mild detergent solut ion. D o not use any type of abrasive pad, scouring powder or solvent, such as alcohol or benzene.

Transportation

When you transport this monitor for repair or shipment, use the original carton and packing materials.

Getting Started

Monitor Information. . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Power Saving Function and LED Indicators. . . . . . . . 11

If thin lines appear on your screen (damper wires). . . 11

Warning Messages. . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Warning on power Connection

• Use the supplied power cord. If you use a different power cord, be sure that it is compatible with your local power supply.

For the customers in the US

If you do not use the appropriate cord, this monitor will not conform to mandatory FCC Standards.

Example of plug types

for 100 to 120 V AC for 200 to 240 V AC

• Before disconnecting the power cord, wait at least 30 seconds after turning off the power to allow the static electricity on the screen’s surface to discharge.

• After the power is turned on, the screen is demagnetiz ed (degaussed) for about 3 seconds. This generates a strong magnetic field around the screen, which may affect data stored on magnetic tapes and disks placed near the monitor. Be sure to keep magnetic recording equipment, tapes and disks away from the monitor.

The equipment should be installed near an easily accessible outlet.

Getting Started

Setup

Connect the monitor to your computer system. This monitor will sync to platforms running at horizontal frequencies between 30 and 96 kHz.

Make sure the compuer system is switched off and attach

Step 1

the video signal cable to the video output of the computer.

Computer

to the video output

Make sure the compuer is switched off and attach the

Step 2

power cord the monitor. Then, attach the other end of the power cord to a power outlet.

Switch on the monitor and computer.

Step 3

Adjust the user controls according to your personal

Step 4

preference. Installation is complete.

Parts and Controls

Front

1 (RESET) button (pages 6, 10)

Resets the adjustments to the factory settings .

2 Auto Sizing and Centering button (page 5)

Automatically adjusts the picture size and position.

3 (BRIGHTNESS) (v/V) buttons (page 5)

Adjust the picture brightness. Operate as the (v/V) buttons when adjusting other items.

4 (MENU) button (page 6)

Displays the MENU OSD.

5 6 (CONTRAST) (B/b) buttons (page 5)

Adjust the contrast. Operate as the (B/b) buttons when adjusting other items.

Rear

6 1 (POWER) switch and indicator

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.

7 AC IN connector

Provides AC power to the monitor.

8 Video input connector (HD15) (page 5)

Inputs RGB video signals and SYNC signals.

Getting Started Customizing Your Monitor

Customizing Your Monitor

Use of the Tilt/Swivel

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.

90°

15°

90°

5°

Video Connector

1234

11 12 13 14 15

Pin No. Signal Pin No. Signal

1 Red 8 Blue Ground 2 Green (Composite

Sync on Green) 3Blue 10Ground 4Ground 11Ground 5 CPU Snense 12 SDA (serial data) 6 Red Ground 13 Horizontal Sync 7 Green Ground 14 Vertical Sync

987

9 Not used (no pin)

15 SCL (serial clock)

Adjusting the Picture Brightness and Contrast

26 26

v/V

or 6 (CONTRAST)

Press the (BRIGHTNESS)

B/b

buttons.

The BRIGHTNESS/CONTRAST OSD appeears.

To adjust the brightness.

Press the (BRIGHTNESS) v/V buttons.

To adjust the contrast.

Press the 6 (CONTRAST) B/b buttons.

BRIGHTNESS/CONTRAST

Automatically Sizing and Centering the Picture

You can easily adjust the picture to fill the screen by pressing the Auto Sizing and Centering button.

Press the Auto Sizing and Centering button.

The picture automatically fills the screen.

Note

This function is intended for use with a computer running Windows or similar graphic user interface software that provides a full-screen picture. It may not work properly if the background color is dark or if the input picture does not fill the screen to the edges (such as an MS-DOS prompt).

The OSD (On-screen Display) System

If necessary, use the BRIGHTNESS buttons to select a spe cific

Introducing the OSD System

You can adjust most of the monitor’s settings using the OSDs (Onscreen Display). All of the OSDs in this illustration are described 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:

Press the MENU button to display the MENU OSD.

Highlight the desired OSD using the BRIGHTNESS buttons and

press the MENU button again.

Resolution for current

CENTER

ZOOM

OSD POSITION

ZOOM

input signal

SIZE

COLOR

OPTION

1 2

9300K

MANUAL DEGAUSS

item. Adjust 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.

When 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 10.

• The each of the adjustment’s OSD automatically disappears after 30 seconds.

EXIT CENTER SIZE GEOMETRY ZOOM COLOR CONVERGENCE OSD POSITION OPTION GRAPHIC ENHANCEMENT

80.0kHz/ 75Hz

1280 X 1024

Horizontal/Vertical frequencies for current input signal

GEOMETRY

ROTATION

CONVERGENCE

9 GRAPHIC ENHANCEMENT

GRAPHIC ENHANCEMENT

STANDARD MODE PRESENTATION MODE GRAPHICS/VIDEO MODE

Adjusting the Settings

1 Adjusting the centering of the

picture (CENTER)

This setting is stored in memory for the current input signal.

Press the MENU button.

The main MENU appears on the screen.

Press the and press the MENU button again.

The CENTER menu appears on the screen.

Press the centering, and the 6 horizontal centering.

The OSD automatically disappears after about 30 seconds. To close the OSD, press the MENU button again.

v/V

buttons to highlight CENTER

v/V

buttons to adjust the vertical

B/b

buttons to adjust the

2 Adjusting the size of the picture

(SIZE)

This setting is stored in memory for the current input signal.

Press the MENU button.

The main MENU appears on the screen.

Press the press the MENU button again.

The SIZE menu appears on the screen.

Press the and the 6

The OSD automatically disappears after about 30 seconds. To close the OSD, press the MENU button again.

v/V

buttons to highlight SIZE and

v/V

buttons to adjust the vertical size,

B/b

buttons to adjust the horizontal size.

Customizing Your Monitor

3 Adjusting the shape of the

picture (GEOM)

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.

Press the MENU button.

The main MENU appears on the screen.

v/V buttons to highlight GEOM and

Press the press the MENU button again.

The GEOMETRY menu appears on the screen.

First 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.

Select To

ROTATION PINCUSHION PIN BALANCE KEYSTONE

KEY BALANCE

Enlarging or reducing the picture

rotate the picture expand or contract the picture sides shift the picture sides to the left or right adjust the picture width at the top of the

screen shift the picture to the left or right at the

top of the screen

(ZOOM)

This setting is stored in memory for the current input signal.

Press the MENU button.

The main MENU appears on the screen.

Press the v/V buttons to highlight ZOOM and press the MENU button again.

The ZOOM menu appears on the screen.

Press the right 6 b button to enlarge the picture or the left 6 B button to reduce the picture.

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.

Customizing Your Monitor

5 Adjusting 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.

Press the MENU button.

The main MENU appears on the screen.

v/V

Press the press the MENU button again.

The COLOR menu appears on the screen.

Press the temperature.

The preset color temperatures are 1 (9300K) and 2 (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 6 B/b buttons to adjust the color temperature manually.

If you are using the Presentation or Graphic/Video mode, the following COLOR OSD appears when “ COLOR” is selected.

This OSD allows you to adjust the color temperature between 11,000K to 9,300K. Press the 6 B/b buttons to adjust the color temperature. The OSD automatically disappears after about 30 seconds. To close the OSD, press the MENU button again.

buttons to highlight COLOR and

v/V

buttons to select a color

COLOR

1 2

VARIABLE

COLOR

VARIABLE

6 Adjusting the quality of the

picture (CONV)

The CONV 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.

Press the MENU button.

The main MENU appears on the screen.

Press the press the MENU button again.

The CONVERGENCE menu appears on the screen.

Press the 6 convergence, or the vertical convergence.

The OSD automatically disappears after about 30 seconds. To close the OSD, press the MENU button again.

v/V

buttons to highlight CONV and

B/b

buttons to adjust the horizontal

v/V

buttons to adjust the

7 Adjusting the OSD position

(OSD)

This setting is stored in memory for the current input signal.

Press the MENU button.

The main MENU appears on the screen.

Press the press the MENU button again.

The OSD POSITION menu appears on the screen.

Press the position or the 6 position.

The OSD automatically disappears after about 30 seconds. To close the OSD, press the MENU button again.

v/V

buttons to highlight OSD and

v/V

buttons to adjust the vertical

B/b

buttons to adjust the horizontal

8 Additional settings (OPTION)

You can manually degauss (demagnetize) the screen, lock the controls, change the OSD language, restore the color image, and cancel the moire.

Press the MENU button.

The main MENU appears on the screen.

Press the press the MENU button again.

The OPTION menu appears on the screen.

Press the 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.

v/V

buttons to highlight OPTION and

v/V

buttons to highlight the desired

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 6 b button.

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.

Locking the controls

To protect adjustment data by locking the controls, first press the (CONTROL LOCK). Then press the right 6 b button to turn the lock ON.

Only the 1 (power) switch, EXIT and (CONTROL LOCK) of the OPTION menu will operate. If any other items are selected, the mark appears on the screen.

To cancel the control lock

Repeat the procedure above and set (CONTROL LOCK) to OFF.

Changing the OSD language

To change the language of the OSD, first press the

v/V

press the 6 language.

• ENG: English

• FRA: French

•DEU: German

• ESP: Spanish

•ITA: Italian

• NLD: Dutch

• SWE: Swedish

• RUS: Russian

• JPN: Japanese

Restoring the Color Image

The color of most display monitors tend to gradually lo se brilliance after several years of service. The Color Ret ur n fe at ur e al lo ws you to restore the color to the original factory preset levels.

To restore the image, first press the to select (COLOR RETURN). Then press the right

6 b

button.

A white rectangle appears in the center of the screen while the image is being restored (about two seconds).

v/V

buttons to highlight

buttons to highlight (LANGUAGE). Then

B/b

buttons to select the desired

OPTION

• ENG

• FRA

• DEU

• ESP

• ITA

• NLD

• SWE

• RUS

• JPN

LANGUAGE

v/V

buttons

OPTION

COLOR RETURN

Customizing Your Monitor

Note

• Before using this feature, the monitor must be in normal operation mode (Green power indicator) for at least 30 minutes. If the monitor goes into power saving mode, you must return the monitor to normal operation mode and wait for 30 minutes for the monitor to be ready. You may need to adjust your computer’s power saving settings to help keep the monitor in normal operation mode for the full 30 minutes. If the monitor is not ready, the following message will appear.

OPTION

AVAILABLE AFTER WARM UP

COLOR RETURN

• The monitor may gradually lose its ability to perform this function due to the natural aging of the picture tube.

Cancelling the moire

To turn the moire cancellation function on or off, first press the MOIRE). Then press the 6 moire cancellation ON or OFF.

Adjusting the amount of the moire cancellation

Before you can adjust this setting, the Cancel Moire setting must be turned ON.

To adjust the amount of moire cancellation, first press the Then press the 6 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.

v/V

buttons to highlight (CANCEL

B/b

buttons to turn the

v/V

buttons to highlight (MOIRE ADJUST).

B/b

buttons to adjust the amount of

Example of moire

Customizing Your Monitor

9 Using the GRAPHIC

ENHANCEMENT OSD

This setting is stored in memory for the current input signal.

Press the MENU button.

The main MENU appears on the screen.

Press the ENHANCEMENT and press the MENU button again.

GRAPHIC ENHANCEMENT OSD appears.

Press the v button to select the mode.

The STANDARD MODE is ideal for spreadsheets, word processing, and other text oriented applications.

The PRESENTATION MODE is useful for presentation programs that require vivid colors.

The GRAPHICS/VIDEO MODE gives movies and games enhanced visual appeal by increasing the sharpness and brightness.

The selected mode indication appears on the screen fo r about th ree seconds.

If the screen appears too white, adjust the color temperature (see “Adjusting the color of the picture (COLOR)” on page 8).

Note

The PRESENTATION MODE and GRAPHICS/VIDEO MODE may produce ghost images when displaying text oriented applications. These modes change the brightness of the picture dynamically according to changes in moving pictures. If ghost images appear, set the Video Enhancement Mode to STANDARD MODE.

v/V

buttons to highlight GRAPHIC

STANDARD MODE

PRESENTATION MODE

GRAPHICS/VIDEO MODE

Resetting the adjustments

Resetting a specific adjustment

Navigate through the on-screen menus to select the adjustment item you want to reset, and press the RESET button. You can do this while you are adjusting an item.

Resetting all of the adjustments for the current input signal

Press the RESET button when no menu is displayed on the screen. Note that the following items are not reset by this method:

• on-screen menu language (page 9)

• on-screen menu position (page 8)

• control lock (page9)

Resetting all of the adjustments for all input signals

Press and hold the reset button for more than two seconds when no menu is displayed on the screen. This resets everything to the factory preset mode.

Resetting all of the adjustment data to the factory presets

Press and hold the reset button for more than five seconds. This resets everything to the factory presets including the input selection.

Note

The RESET button does not function when

set to ON.

(CONTOL LOCK) is

Additional Information

Warning Messages

If there is something wrong with the input signal, one of the following messages appears.

Out of Scan Range

This message indicates that the current input signal is not appropriate by the monitor’s specificatons.

Check signal cable (self test pattern)

This message indicates that there are no input signal is received, or the video cable is not connected.

INFORMATION

MONITOR IS WORKING OUT OF SCAN RANGE

INFORMATION

MONITOR IS WORKING CHECK SIGNAL CABLE WHITE

RED GREEN BLUE

To solve these problems, see the “Troubleshooting” section below.

Troubleshooting

Before calling service technician regarding picture quality related questions, please press and hold (RESET) button for 6 seconds. This resets everything to the factory presets including the input selection.

If the problem is caused by the connected computer or other equipment, please refer to the connected equipment’s instruction manual.

Symptom Check these items No picture

If the 1 (power) indicator is not lit • Check that the power cord is properly connected.

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

If the OUT OF SCAN RANGE message appears on the screen

Picture flickers, bounces, oscillates, or is scrambled

• Check that the 1 (power) switch is in the “on” position.

• 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 ke y 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.

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: 30–96 kHz Vertical: 48–120 Hz

• 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 fre quency 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.

Additional Information

Symptom Check these items Picture is fuzzy • Adjust the brightness and contrast (page 5).

Picture is ghosting • Eliminate the use of video cable extensions and/or video switch boxes.

Picture is not centered or sized properly

Edges of the image are curved • Adjust the geometry (page 7). Wavy or elliptical pattern (moire) is

visible

Color is not uniform • Degauss the monitor* (page 9). If you place equipment that generates a magnetic field, such

White does not look white Letters and lines show red or blue

shadows at the edges Monitor buttons do not operate • If the control lock is set to ON, set it to OFF (page 9). COLOR RETURN does not function • COLOR RETURN does not work unless the monitor has been in normal operation (Green

OPTION

AVAILABLE AFTER WARM UP

COLOR RETURN

A hum is heard right after the power is turned on

* If a second degauss cycle is needed, allow a minimum interval of 20 minutes for the be st res ult. A h umming n oise m ay be h eard, but this is not a malfunction.

• Degauss the monitor* (page 9).

• If CANCEL MOIRE is ON, the picture may become fuzzy. Decrease the moire cancellation effect (page 9) or set CANCEL MOIRE to OFF.

• Check that all plugs are firmly seated in their sockets.

• Check the Graphic Enhancement mode, if you are using a still picture application such as Excel.

• Press the Auto Sizing and Centering button (page 5).

• Adjust the size (page7) or centering (page 7). Note that some video modes do not fill the screen to the edges.

• Cancel the moire (page 9).

Problems caused by the connected computer or other equipment

• Change your desktop pattern.

as a speaker, near the monitor, or if you change the direction the monitor faces, color may lose uniformity.

• Adjust the color temperature (page 8).

• Adjust the convergence (page 8).

power indicator) for at least 30 minutes. See page 9 for detailed information about Image Restoration.

• In order to keep the monitor “on”, you may need to check the PC’s power saving setting.

• The monitor may gradually lose its abili ty to perfor m this functio n due to th e natural ag ing of the picture tube.

• This is the normal sound of the auto-degauss cycle. When the power is turned on, the monitor is automatically degaussed for three seconds.

MCM-19T1

SECTION 2

DISASSEMBLY

2-1. CABINET REMOV AL

Two claws

Cabinet

Two screws

2-2. SERVICE POSITION

PUSH

(BVTP 4 x 16)

2-3. D, A, H and N BOARD REMOV AL

A board

H board

(additional board)

A board

Five screws

(BVTP 3 x 12)

rotate 180º

D board

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.

H board

N board

Holder

— 10 —

One screw

(BVTT 4 x 8)

Two Cable stoppers

Two screws

(BVTP 3 x 12)

Cable bracket

D board

2-4. PICTURE TUBE REMOVAL

Demagnetization coil

Tension spring

A board

Neck assy

Deflection yoke

Four screws

(Tapping screw 5)

Picture tube shield

Two screws

Stand assy

(D board)

MCM-19T1

(BVTP 4 x 16)

Anode cap

Cushion

REMOVAL OF THE 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.

REMOVAL PROCEDURES

1. Turn up one side of the rubber cap in the direction indicated by arrow a .

2. Use your thumb to pull the rubber cap firmly in the direction indicated by

arrow b .

HOW TO HANDLE AN ANODE-CAP

1. Do not use sharp objects which may cause damage to the surface of the anode-cap.

2. Do not squeeze the rubber covering too hard to avoid damaging the anode-cap. A material fitting called a shatter-hook terminal is built into the rubber.

3. Do not force turn the foot of the rubber cover. This may cause the shatter-hook terminal to protrude and damage the rubber.

Anode Button

3. When 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 .

— 11 —

+ 23 hidden pages

Sony MCM-19T1 Schematic

SAFETY CHECK-OUT

TABLE OF CONTENTS

GENERAL

DISASSEMBLY