Sony SDM-X72 Service Manual
SERVICE MANUAL
SPECIFICATIONS
SDM-X72
US Model
Canadian Model
AEP Model
Chinese Model
LCD panel Panel type: a-Si TFT Active Matrix
Picture size: 17.0 inch
Input signal format RGB operating frequency*
Horizontal: 28 – 92 kHz
Vertical: 56 – 85 Hz
Resolution Horizontal: Max.1280 dots
Vertical: Max.1024 lines
Input signal levels Analog RGB video signal
0.7 Vp-p, 75 Ω , positive
SYNC signal
TTL level, 2.2 kΩ ,
positive or negative
(Separate horizontal and vertical,
or composite sync)
0.3 Vp-p, 75Ω , negative
(Sync on green)
Digital RGB (DVI) signal: TMDS
(Single link)
Power requireme n ts 100 – 240 V, 50 – 60 Hz,
0.9
Max. A
Power consumption
Operating temperature 5 – 35
Max. 40 W
°
C
Dimensions (width/height/depth)
Display (upright):
Approx. 438 ×410 × 227 mm
1
/4 × 16 1/4 × 9 inches)
(17
(with stand)
Approx. 438 × 356 × 84 mm
1
/4 × 14 1/8 ×3 3/8inches)
(17
(without stand)
Mass
Plug & Play DDC2B
* Recommended horizon tal and vertical timing condition
• Horizontal sync width dut y should be more than 4. 8% of total
horizontal time or 0.8 µs, whichever is larger.
• Horizontal blanking width should be more than 2.5 µsec.
• Vertical blanking width sh ould be more than 450 µsec.
Design and specification s are subject to change without noti ce.
Approx. 7.1 kg (15 lb 10 oz) (with
stand)
Approx. 5.3 kg (11 lb 11 oz)
(without stand)
TFT LCD Color Computer Display
1.5 k
Ω
0.15 µF
AC
Voltmeter
(0.75 V)
To Exposed Metal
Parts on Set
Earth Ground
SAFETY CHECK-OUT
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 connector shell, metal trim, “metallized” knobs, screws, and
all other exposed metal parts for AC Leakage. Check leakage as described right.
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 WT540A. 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)
Fig. A. Using an AC voltmeter to check AC leakage.
SDM-X72(E) 2
WARNING!!
AVERTISSEMENT!!
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY SHADING AND MARK ! ON THE
SCHEMATIC DIAGRAMS, EXPLODED VIEWS AND IN THE
PARTS LIST ARE CRITICAL FOR SAFE OPERATION. REPLACE
THESE COMPONENTS WITH SONY PARTS WHOSE PART
NUMBERS APPEAR AS SHOWN IN THIS MANUAL OR IN
SUPPLEMENTS PUBLISHED BY SONY. CIRCUIT ADJUSTMENTS THAT ARE CRITICAL FOR SAFE OPERATION ARE
IDENTIFIED IN THIS MANUAL. FOLLOW THESE PROCEDURES
WHENEVER CRITICAL COMPONENTS ARE REPLACED OR IMPROPER OPERATION IS SUSPECTED.
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. LES RÉGLAGES DE CIRCUIT DONT L’IMPORTANCE EST
CRITIQUE POUR LA SÉCURITÉ DU FONCTIONNEMENT SONT
IDENTIFIÉS DANS LE PRÉSENT MANUEL. SUIVRE CES
PROCÉDURES LORS DE CHAQUE REMPLACEMENT DE
COMPOSANTS CRITIQUES, OU LORSQU’UN MAUVAIS
FONCTIONNEMENT EST SUSPECTÉ.
SDM-X72(E) 3
POWER SAVING FUNCTION
g
AUTOMATIC PICTURE QUALITY ADJUSTMENT
FUNCTION
(ANALOG RGB)
This monitor meets the power-saving guidelines set by VESA,
E
NERGY STAR, and NUTEK. If the monitor is connected to a
computer or video graphics board that is DPMS (Display Power
Management Signaling) compliant, the monitor will
automatically reduce power consumption as shown below.
Power mode Power consumption
1
(power)
indicator
normal
40 W (max.) green
operation
active off*
3 W (max.) orange
(deep sleep)**
1 (power) off 1 W red
main power of f 0 W off
* When your computer enters the “active off” mode, the input signal is
cut and NO INPUT SI GNAL appears on the screen . After 10 s econds,
the monitor enters the po w er sa vin g m ode .
** “Deep sleep” is a powe r saving mode defined by t he Environmental
Protection Agency.
Note
ZZ...
If the (POWER SAVE) is set to OFF (page 16), th e monitor does not
enter the power saving mode.
When the monitor receives an input signal, it
automatically adjusts the picture’s position and
sharpness (phase/pitch), and ensures that a clear
picture appears on the screen.
The factory preset mode
When the monitor receives an input signal, it automatically
matches the signal to one of the fact ory preset modes stored in th e
monitor’s memory to provide a high quality picture at the center
of the screen. If the input signal matches the factory pre set mode,
the picture is appears on the screen automatically with the
appropriate default adjustment.
If input signals do not match one of the factory
preset modes
When the monitor receives an input signal , the automat ic pict ure
quality adjustment function of this monitor is activated and
ensures that a clear picture always appears on the screen (wit hin
the following monitor frequency ranges):
Horizontal frequency:
Vertical frequency:
Consequently, the first time the monitor receives input signals
that do not match one of the factory preset modes, the monitor
may take a longer time than normal for displaying the picture on
the screen. This adjustment data is automatically stored in
memory so that next time, the monitor will function in the same
way as when the monitor receives the signals that match one of
the factory preset modes.
28 – 92 kHz
56 – 85 Hz
If you adjust the phase, pitch, and pictures
position manually
For some input signals, the automatic picture quality adjustment
function of this monitor may not completely adjust the picture
position, phase, and pitch. In this case, yo u can manually set these
adjustments (page 13). If you manually set these adjustments,
they are stored in memory as user modes and automatically
recalled whenever the monitor receives the same input si
nals.
SDM-X72(E) 4
TABLE OF CONTENTS
Section Title Page Section Title Page
1. DISASSEMBLY
1-1. Rear Cover and Cabinet Assy Removal ............... 1-1
1-2. H Board Removal ................................................ 1-2
1-3. I Board Removal .................................................. 1-3
1-4. A Board Removal ................................................ 1-4
1-5. G Board Removal ................................................ 1-5
1-6. U Board and LCD Unitl Removal......................... 1-6
1-7. LCD Panel Removal ............................................ 1-7
2. ADJUSTMENTS
2-1. Service Functions of Buttons in Front Panel ........ 2-1
2-2. Usea of Service Mode .......................................... 2-2
2-3. Functions of Service Mode .................................. 2-3
3. DIAGRAMS
3-1. Block Diagrams .................................................... 3-1
3-2. Circuit Boards Location........................................ 3-2
3-3. Schematic Diagrams and Printed Wiring Boards.. 3-3
(1)Schematic Diagram
of A(a,b,c,d,e,f,g,h) Board......... 3-4
(2)Schematic Diagram of H Board. ...................... 3-13
(3)Schematic Diagram of I Board......................... 3-15
(4)Schematic Diagram of U Board. ...................... 3-17
(5)Schematic Diagram of G Board. ...................... 3-19
4. EXPLODED VIEWS
4-1. Chassis ................................................................. 4-2
2-4. White Balance Adjustment .................................. 2-3
2-5. Action after Replacing
the LCD Panel and Board ..................................... 2-5
4-2. Packing Materials ................................................. 4-3
5. ELECTRICAL PARTS LIST ............................... 5-1
SDM-X72(E) 5
1-1. REAR COVER AND CABINET ASSY REMOVAL
SECTION 1
DISASSEMBLY
1 Rear cover
3 Four screws
(+PWH 3X12)
4 Cabinet assy
Protection sheet
2 Four screws
(+PSW 4X10)
SDM-X72(E) 1-1
1-2. H BOARD REMOVAL
2 Three screws
(+PTP 3X8)
3 H Board
CN901
1 Connector
SDM-X72(E) 1-2
1-3. I BOARD REMOVAL
2 Invertor shield
3 Connector
CN03
1 Screw
(+PWH 3X6)
3 Connector
CN01
4 Screw
(+PWH 3X6)
3 Connector
CN02
5 I Board
SDM-X72(E) 1-3
1-4. A BOARD REMOVAL
1 Four screws
(+PWH 3X6)
2 Interface shield
4 Connector
CN304
5 Four screws
(+PWH 3X6)
4 Connector
CN202
4 Connector
CN501
4 Connector
CN201
4 Connector
CN801
6 A Board
4 Six connector screws
SDM-X72(E) 1-4
1-5. G BOARD REMOVAL
3 Connector
CN203
1 Two screws
(+PWH 3X6)
2 Power shield
4 Screw
(+PWH 3X6)
5 G Board
3 Connector
CN102
3 Connector
CN101
SDM-X72(E) 1-5
1-6. U BOARD AND LCD UNIT REMOVAL
3 Two screws
(+PTP 4X10)
3 Two screws
(+PTP 4X10)
4 LCD unit
2 Screw
(+PWH 3X6)
1 Connector
CN851
6 Screw
(+PTP 3X8)
7 U Board
5 Connector
CN852
SDM-X72(E) 1-6
1-7. LCD PANEL REMOVAL
2 LCD panel
1 Two screws
(+P 3X4)
1 Two screws
(+P 3X4)
SDM-X72(E) 1-7
SECTION 2
ADJUSTMENTS
2-1. Service Functions of Buttons in Front Panel
The following functions are available for servicing the set.
1. To display the model information
Press the MENU button for five seconds or more in the ordinary power-on state,
and the following information is displayed on the screen:
- Model name
- Serial number
- Manufactured year and week
This function is described in the instruction manual also.
2. To display ETI (Elapsed Time Indicator)
Press the OK button for five seconds or more in the ordinary power-on state, and
the cumulative power-on time excluding the power-off and power saving state is
displayed on the screen.
3. All mode recall
Press the POWER button with pressing the OK button in the power-off state, and
the user memory is completely cleared and the system is reset to the factory setting.
This reset is similar to RESET in the OSD menu, but differs from it in the
following:
- The NO SYNC AGING flag is cleared.
- LANGUAGE is set to ENGLIDH.
- INPUT is set to INPUT1: DVI-D.
5. To enter the service mode
Press the POWER button with pressing the UP (↑) and DOWN (↓)
buttons in the power-off state, and the system is set to the service mode. The service
mode will be explained later.
To exit from the service mode, turn off the power.
6. To copy EDID to the EEPROM and to clear ETI
Press the POWER button with pressing the UP (↑) and OK buttons in the
power-off state, and the data for the model information are copied to the EEPROM
for the internal microcontroller from EDID of INPUT2: HD15, and the model
information display is made correct.
When replacing the A board, this operation is required after writing EDID and at
the same time ETI is reset to 0.
7. To enter the ISP mode
Turn on the MAIN POWER switch with pressing the DOWN (↓) button in the
main-power-off state, and the system enters the ISP mode. The POWER LED goes
off, and both input LED's 1 and 2 light on, and the picture disappears, and any
button becomes invalid.
In the ISP mode, the internal software can be updated with an external personal
computer using a special fixture.
To cancel the ISP mode, turn off the MAIN POWER switch.
4. To set the NO SYNC AGING flag
Press the POWER button with pressing the UP (↑) button in the power-off
state, and the NO SYNC AGING flag is set. In this setting, when the input with no
input signal is selected, the system goes into the AGING MODE.
The NO SYNC AGING flag is held until it is cleared. To clear the NO SYNC
AGING flag, go into the service mode and then set the AGING MODE to OFF, or
execute the all mode recall.
SDM-X72(E) 2-1
2-2. Uses of Service Mode
1. Turn off the power with the POWER button in the front panel. The red POWER
LED lights on.
2. Press the POWER button in the front panel with pressing the UP (↑) and
DOWN (↓) buttons, and the system enters the service mode.
When no signal is input to the selected input terminal, the following functions are
disabled.
3. Press the MENU button, and the main menu is displayed. Then go to page 2 of the
main menu with the UP (↑) or DOWN (↓) button, then select the MAINTAIN icon
on the bottom line, and then press the OK button.
4. In this menu screen, the version number and released date of the internal software
can be checked.
5. The structure of the MAINTAIN menu is shown below.
MAINTAIN
CONFIGURATI ON
CHIPS
EXIT
COLOR TEMP
INITIAL EEPROM
CLEAR ETI TIME
EEPROM TEST
RGB RESET
EXIT
AGING MODE
REGISTERS VALUE
9300K
6500K
EXIT
ON
OFF
CONTROL REG
EXIT
SUB-BRIGHTNESS
R
G
B
SUB-CONTRAST
R
G
B
EXIT
000~1FF
The operation procedure is basically same as that of the ordinary user controls.
The function of each menu is explained in next section.
SDM-X72(E) 2-2
2-3. Functions of Service Mode
2-4. White Balance Adjustment
1. COLOR TEMP
This is used for the white balance adjustment at color temperature 9300 K and 6500
K. The adjustment requires to be done for every input (INPUT1: DVI-D, INPUT1:
HD15, or INPUT2: HD15) by switching the input. The adjustment data is stored into
the register for respective inputs.
2. INITIAL EEPROM
This sets the data of the EEPROM to the default data. This operation is not required
usually.
3. CLEAR ETI TIME
This resets the ETI (Elapsed Time Indicator) counter to 00000 H.
4. EEPROM TEST
This tests writing and reading of the EEPROM.
5. RGB RESET
This adjust the offset and gain of the input AD converter for the analog inputs
(INPUT1: HD15 and INPUT2:HD15). As these adjustments are common to both
inputs, perform them for either input. It is unnecessary for another input.
Execute the adjustments under the condition where the signal specified in "White
Balance Adjustment" is input.
6. AGING IN MODE
This sets and clears the NO SYNC AGING flag.
AGING MODE = ON: Sets the NO SYNC AGING flag.
AGING MODE = OFF: Clears the NO SYNC AGING flag.
When the NO SYNC AGING flag is set and the input with no input signal is
selected, the system goes into the AGING MODE. The NO SYNC AGING flag is
held until it is cleared. To clear the NO SYNC AGING flag, go into the service mode
and then set the AGINGN MODE to OFF, or execute the all mode recall.
< Preparation >
(1) Measurement point : Center of screen
(2) Measurement distance : 50 cm
(3) Measurement angle : 90°
(4) Color analyzer (Minolta CS-1000 or equivalent)
(5) Signal generator (Astro Design VG-828D or equivalent)
Be sure to calibrate the analog RGB output level with 75Ω termination.
1. Service mode setting
Enter the service mode referring to step 1 and 2 of Section 2-2.
2. Aging
Set the AGING MODE in the service mode to ON. Disconnect the signal input
terminal or select the input with no signal input, and the system goes into the
AGING MODE.
Execute aging for 30 minutes or more.
3. User control setting
Feed a signal to the selected input, and then execute reset in the menu screen. Then,
move the menu display position to avoid the measurement point. Or, set the
following for respective inputs.
BACKLIGHT (Brightness of backlight) = 100
CONTRAST = 70
BRIGHTNESS = 50
Menu display position = not center of screen (Avoid the measurement point.)
(The setting of the menu display position is common to respective inputs.)
ECO = OFF (The setting of ECO is common to respective inputs.)
Do not change the above setting until the white balance adjustment is completed.
7. CONTROL REG.
This can check the data of the internal registers. This operation is not required
usually.
SDM-X72(E) 2-3
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