HP GDM-FW9012 User manual

CHASSIS
SERVICE MANUAL
SPECIFICATIONS
G1W
N.Hemisphere Model
Chassis No. SCC-L34E-A
24-inch Color Monitor
GDM-FW9012
HP
()
CRT 0.23 – 0.27 mm aperture grille pitch
24 inches measured diagonally
90-degree deflection
FD Trinitron
Viewable image size Approx. 482.1 ×308.2 mm (w/h)
(19 ×12
1
/ 4 inches)
22.5" viewing image
Resolution Maximum (16:10)
Horizontal: 2304 dots
Vertical: 1440 lines
Maximum (4:3)
Horizontal: 2048 dots
Vertical: 1536 lines
Recommended (16:10)
Horizontal: 1920 dots
Vertical: 1200 lines
Input signal levels Video signal
Analog RGB: 0.700 Vp-p
(positive), 75 Ω
SYNC signal
H/V separate or composite sync:
TTL 2 k Ω , Polarity free
Sync on Green: 0.3 Vp-p
(negative)
Standard image area 16:10
Approx. 474 × 296 mm (w/h)
(18
3
/
4
× 11
3
/
4
inches)
4:3 Approx. 395
× 296 mm (w/h)
(15
5
/
8
× 11
3
/
4
inches)
5:4 Approx. 370
× 296 mm (w/h)
(14
5
/ 8 × 11
3
/ 4 inches)
()
Deflection frequency* Horizontal: 30 to 121 kHz
Vertical: 48 to 160 Hz
AC input voltage/current 100 to 240 V, 50/60 Hz, 2.2 – 1.2A
Power consumption Approx.160W(withnoUSBdevices
connected)
Operating temperature 10˚C to 40˚C
Dimensions
Approx. 571.5 × 500 ×522.5 mm(w/h/
d)
(22
1
/
2
× 19
3
/
4
× 20
5
/
8
inches)
Mass Approx. 42 kg (92 lb 10 oz)
Plug and Play DDC1/DDC2B/DDC2Bi, GTF**
Supplied accessories • Power cord (1)
• Video signal cable (1)
• USB cable (1)
• Exclusive Power Mac G3/G4
adapter (1)
• Warranty card (1)
• Notes on cleaning the screen’s
surface (1)
• This instruction manual (1)
* Recommended horizontal and vertical timing condition
• Horizontal sync width duty should be more than 4.8% of
total horizontal time or 0.8 µs, whichever is larger.
• Horizontal blanking width should be more than 2.3 µsec.
• Vertical blanking width should be more than 450 µsec.
** If the input signal is Generalized Timing Formula (GTF)
compliant, the GTF feature of the monitor will automatically
provide an optimal image for the screen.
Design and specifications are subject to change without notice.

GDM-FW9012(E) 2
LEAKAGE TEST
The AC leakage from any exposed metal part to earth ground and from all
exposed metal parts to any exposed metal part having a return to chassis,
must not exceed 0.5 mA (500 microamperes).
Leakage current can be measured by any one of three methods.
1. A commercial leakage tester, such as the Simpson 229 or RCA WT-
540A. Follow the manufacturers’ instructions to use these instruments.
2. A battery-operated AC milliammeter. The Data Precision 245 digital
multimeter is suitable for this job.
3. Measuring the voltage drop across a resistor by means of a VOM or
battery-operated AC voltmeter. The “limit” indication is 0.75 V, so
analog meters must have an accurate low-voltage scale. The Simpson 250
and Sanwa SH-63Trd are examples of a passive VOMs that are suitable.
Nearly all battery operated digital multimeters that have a 2 V AC range
are suitable. (See Fig. A)
After correcting the original service problem, perform the following safety
checks before releasing the set to the customer:
1. Check the area of your repair for unsoldered or poorly-soldered
connections. Check the entire board surface for solder splashes and
bridges.
2. Check the interboard wiring to ensure that no wires are “pinched” or
contact high-wattage resistors.
3. Check that all control knobs, shields, covers, ground straps, and
mounting hardware have been replaced. Be absolutely certain that you
have replaced all the insulators.
4. Look for unauthorized replacement parts, particularly transistors, that
were installed during a previous repair. Point them out to the customer
and recommend their replacement.
5. Look for parts which, though functioning, show obvious signs of
deterioration. Point them out to the customer and recommend their
replacement.
6. Check the line cords for cracks and abrasion. Recommend the
replacement of any such line cord to the customer.
7. Check the B+ and HV to see if they are specified values. Make sure your
instruments are accurate; be suspicious of your HV meter if sets always
have low HV.
8. Check the antenna terminals, metal trim, “metallized” knobs, screws, and
all other exposed metal parts for AC Leakage. Check leakage as
described right.
Fig. A. Using an AC voltmeter to check AC leakage.
1.5 k Ω 0.15 µ FAC
Voltmeter
(0.75 V)
To Exposed Metal
Parts on Set
Earth Ground
SAFETY CHECK-OUT

GDM-FW9012(E) 3
WARNING!!
NEVER TURN ON THE POWER IN A CONDITION IN WHICH THE
DEGAUSS COIL HAS BEEN REMOVED.
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY SHADING AND MARK !ON THE
SCHEMATIC DIAGRAMS, EXPLODED VIEWS AND IN THE
PARTS LIST ARE CRITICAL FOR SAFE OPERATION. REPLACE
THESE COMPONENTS WITH SONY PARTS WHOSE PART
NUMBERS APPEAR AS SHOWN IN THIS MANUAL OR IN
SUPPLEMENTS PUBLISHED BY SONY. CIRCUIT ADJUST-
MENTS THAT ARE CRITICAL FOR SAFE OPERATION ARE
IDENTIFIED IN THIS MANUAL. FOLLOW THESE PROCEDURES
WHENEVER CRITICAL COMPONENTS ARE REPLACED OR IM-
PROPER OPERATION IS SUSPECTED.
AVERTISSEMENT!!
NE JAMAIS METTRE SOUS TENSION QUAND LA BOBINE DE
DEMAGNETISATION EST ENLEVÉE.
ATTENTION AUX COMPOSANTS RELATIFS À LA SÉCURITÉ!!
LES COMPOSANTS IDENTIFIÉS PAR UNE TRAME ET UNE
MARQUE !SONT CRITIQUES POUR LA SÉCURITÉ. NE LES
REMPLACER QUE PAR UNE PIÈCE PORTANT LE NUMÉRO
SPECIFIÉ.LES RÉGLAGES DE CIRCUITDONTL’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.

GDM-FW9012(E) 4
POWER SAVING FUNCTION
This monitor meets the power-saving guidelines set by VESA,
E NERGY S TAR, and NUTEK. If the monitor is connected to a
computer or video graphics board that is DPMS (Display Power
ManagementSignaling) compliant, the monitor will automatically
reduce power consumption in three stages as shown below
.
* Figures reflect power consumption when no USB compatible
peripherals are connected to the monitor.
** “Sleep” and “deep sleep” are power saving modes defined by the
Environmental Protection Agency.
*** When your computer enters power saving mode, the input signal is
cut and NO INPUT SIGNAL appears on the screen before the
monitor enters active off mode. After a few seconds, the monitor
enters power saving mode.
Power mode Power
consumption*!(power) indicator
normal
operation ≤170 W green
1 standby ≤15 W green and orange
alternate
2 suspend
(sleep)** ≤15 W green and orange alternate
3 active off***
(deep sleep)** ≤1 W orange
power off 0 W off

GDM-FW9012(E) 5
DIAGNOSIS
This monitor is equipped with a self-diagnosis function. If there is
a problem with your monitor or computer(s), the screen will go
blank and the !(power) indicator will either light up green or
flash orange. If the !(power) indicator is lit in orange, the
computer is in power saving mode. Try pressing any key on the
keyboard or moving the mouse.
xIf the !(power) indicator is green
1 Disconnect any plugs from the video input 1 and 2
connectors, or turn off the connected computer(s).
2 Pressthe !(power) buttontwice toturn the monitor
off and then on.
3 Move the joystick to the right for 2 seconds before
the monitor enters power saving mode.
If all four color bars appear (white, red, green, blue), the monitor
is working properly. Reconnect the video input cables and check
the condition of your computer(s).
If the color bars do not appear, there is a potential monitor failure.
Inform your authorized Sony dealer of the monitor’s condition.
xIf the !(power) indicator is flashing orange
Press the !(power) button twice to turn the monitor off
and then on.
If the !(power) indicator lights up green, the monitor is working
properly.
If the !(power) indicator is still flashing, there is a potential
monitor failure. Count the number of seconds between orange
flashes of the !(power) indicator and inform your authorized
Sony dealer of the monitor’s condition. Be sure to note the model
name and serial number of your monitor. Also note the make and
model of your computer and graphic board.
MENU
INPUTASCRESET 21
!(power) indicator

GDM-FW9012(E) 6
TIMING SPECIFICATION
PRIMARY MODE PRIMARY
MODE AT PRODUCTION MODE 1 MODE 2 MODE 3 MODE 4 MODE 5 MODE 6 MODE 7 MODE 8 MODE 9
RESOLUTION (HXV) 640 X 480 720 X 400 1920 X 1080 1600 X 1024 1920 X 1200 2304 X 1440 1600 X 1024 1920 X 1080 1920 X 1080
CLOCK 25.175 MHz 28.322 MHz 172.798 MHz 198.832 MHz 282.744 MHz 383.863 MHz 170.447 MHz 216.023 MHz 216.023 MHz
— HORIZONTAL —
H-FREQ 31.469 kHz 31.469 kHz 67.080 kHz 91.375 kHz 107.100 kHz 120.560 kHz 81.320 kHz 84.384 kHz 84.384 kHz
usec usec usec usec usec usec usec usec usec
H. TOTAL 31.778 31.777 14.908 10.944 9.337 8.295 12.297 11.851 11.851
H. BLK 6.356 6.355 3.796 2.897 2.546 2.292 2.910 2.963 2.963
H. FP 0.636 0.636 0.694 0.563 0.538 0.458 0.188 0.222 0.222
H. SYNC 3.813 3.813 1.204 0.885 0.736 0.667 0.939 1.000 1.000
H. BP 1.907 1.907 1.898 1.448 1.273 1.167 1.784 1.741 1.741
H. ACTIV 25.422 25.422 11.111 8.047 6.791 6.002 9.387 8.888 8.888
— VERTICAL —
V. FREQ(Hz) 59.940 Hz 70.087 Hz 60.000 Hz 85.000 Hz 85.000 Hz 80.000 Hz 76.000 Hz 72.000 Hz 72.000 Hz
lines lines lines lines lines lines lines lines lines
V. TOTAL 525 449 1118 1075 1260 1507 1070 1172 1172
V. BLK 45 49 38 51 60 67 46 92 92
V. FP 10 12 1 1 1 1 3 3 3
V. SYNC 2 2 3 3 3 3 3 3 3
V. BP 33 35 34 47 56 63 40 86 86
V. ACTIV 480 400 1080 1024 1200 1440 1024 1080 1080
— SYNC —
INT(G) NO NO NO NO NO NO NO NO NO
EXT(H/V)/POLARITY YES N/N YES N/P YES N/N YES N/N YES N/N YES N/N YES N/N YES N/N YES N/N
EXT(CS)/POLARITY NO NO NO NO NO NO NO NO NO
INT/NON INT NON INT NON INT NON INT NON INT NON INT NON INT NON INT NON INT NON INT

GDM-FW9012(E) 7
TABLE OF CONTENTS
Section Title Page Section Title Page
1. DISASSEMBLY
1-1. Cabinet Assy Removal ......................................... 1-1
1-2. D Board Removal ................................................ 1-2
1-3. G Board Removal ................................................ 1-3
1-4. A Board and I/O Terminal Board Assy
Removal ............................................................... 1-4
1-5. S Board Removal ................................................. 1-5
1-6. N Board Removal ................................................ 1-6
1-7. Service Position .................................................... 1-7
1-8. Picture Tube Removal .......................................... 1-8
1-9. Control Block Assy Removal .............................. 1-9
1-10.J Board Removal .................................................. 1-10
1-11.US Board Removal .............................................. 1-11
1-12.Harness Location ................................................. 1-12
2. SAFETY RELATED ADJUSTMENT .......................... 2-1
3. ADJUSTMENTS ..................................................................................... 3-1
4. DIAGRAMS
4-1. Block Diagrams .................................................... 4-1
4-2. Frame Schematic Diagram.................................... 4-6
4-3. Circuit Boards Location........................................ 4-7
4-4. Schematic Diagrams and Printed Wiring
Boards ................................................................... 4-8
(1) Schematic Diagram of A Board .................................. 4-10
(2) Schematic Diagram of D Board .................................. 4-13
(3) Schematic Diagram of G Board .................................. 4-16
(4) Schematic Diagrams of H Boards .............................. 4-18
(5) Schematic Diagrams of J Boards ................................ 4-20
(6) Schematic Diagrams of N (a, b, c) Board ........... 4-21
(7) Schematic Diagram of S Board ................................... 4-25
(8) Schematic Diagram of US Board ................................ 4-27
4-5.Semiconductors .......................................................... 4-29
5. EXPLODED VIEWS
5-1. Chassis ................................................................. 5-1
5-2. Picture Tube ......................................................... 5-2
5-3. Packing Materials ................................................. 5-3
6. ELECTRICAL PARTS LIST ................................................. 6-1

GDM-FW9012(E) 1-1
SECTION 1
DISASSEMBLY
1-1. CABINET ASSEMBLY REMOVAL
1Screw cover(L)
0Video shield assembly
8Top cover
6Cabinet assembly
4Two claws
5Two claws
5Two claws
2Screw cover(R)
3Four screws
(+ BVTP 4 x 16)
7Four screws
(+ BVTT 4 x 8)
9Three screws
(+ BVTT 4 x 8)
Claw Bezel
Knock lightly cabinet
assembly in the
direction of arrow A.
A

GDM-FW9012(E) 1-2
1-2. D BOARD REMOVAL
4Two screws
(+ BVTP 3 x 12)
6D board
Tow hooks
GND
CN504
1Three screws
(+ BVTT 4 x 8)
5Printed circuit board holder
3Screw
(+ P 3.5 x 20)
2Open the D block in the direction
of the arrow A. and remove of
the arrow B.
CN505
A
B

GDM-FW9012(E) 1-3
1-3. G BOARD REMOVAL
Two hooks
3Two screws
(+BVTP 3 x 8)
4G shield
7G board
8Two screws
(+ KTP 3 x 8)
1Three screws
(+ BVTT 4 x 8)
5Screw
(+BVTP 3 x 8)
9AC inlet (3P)
CN654
CN653
CN652
CN655
CN601
CN603
CN650
CN651
GND
GND
CN602
GND
2Open the G block in the direction
of the arrow A. and remove of
the arrow B.
6Two printed circuit board holders
B
A

GDM-FW9012(E) 1-4
1-4. A BOARD,U BOARD AND I/O TERMINAL BOARD ASSY REMOVAL
4A board (2/2)
2Screw(M4)
(EXT TOOTH Washer)
1Three screws
(+BVTT 4 x 8)
5Two screws
(HD15)
6Terminal board assembly
3A board (1/2)
A board (1/2)
When installing terminal
bracket,be sure to apply
screw lock on 2 spots after
screws (HD15) are fixed.
A board (1/2)
Screw lock

GDM-FW9012(E) 1-5
1-5. S BOARD REMOVAL
CN3003
CN3002
CN3001
2S board
1Screw
(+ BVTT4 x 8)

GDM-FW9012(E) 1-6
1-6. N BOARD REMOVAL
2N board
1Two printed circuit board holders
CN010
CN011
CN001
CN007
CN002
CN003
CN5002 CN5001
CN5003

GDM-FW9012(E) 1-7
1-7. SERVICE POSITION
D board (Refer to 2-2.)
CN602
Rear shield
D,G boards
G board
(Refer to 2-3.)
AC inlet (3P)
CAUTION : SHORT
If the claw is hooked,
opening and closing
the board is impossible.
Do not try to do it by force.
If the claw is hooked,
opening and closing
the board is impossible.
Do not try to do it by force.

GDM-FW9012(E) 1-8
1-8. PICTURE TUBE REMOVAL
GND
P5
P6
0Picture tube
8Anode cap
!™ Neck assembly
!¡ Deflection yoke
5Bezel
3Four screws
(Tapping screw 7 + crown washer)
4Four screws
(+BVTP 4 x 16)
9Four screws
(+BVTT 4 x 8)
1Open the D block.
(Refer to 2-2.)
2Open the G block.
(Refer to 2-3.)
6A board
7Three connectors
PROTECTION SHEET
NOTE: When replaced the picture tube,
stick the PROTECTION SHEET
(Part No. 4-036-700-01) on the
picture tube band.

GDM-FW9012(E) 1-9
1-9. CONTROL BLOCK ASSY REMOVAL
1Two screws
(+ BVTT 4 x 8)
3Two screws
(
+ BVTP 3 x 12
)
4Control block assembly
2Picture tube shield
complete assembly
Connector(4P)
Connector(11P)
GND
Connector(2P)
Connector(4P)
Connector(2P)
Holder
Remove the picture tube.(Refer to 2-8.)

GDM-FW9012(E) 1-10
1-10. J BOARD REMOVAL
CN891
1Claw
Two hooks
2J board
Remove the control block assembly.(Refer to 2-9.)

GDM-FW9012(E) 1-11
1-11. US BOARD REMOVAL
5US board
2Stand cover
4USB shield
Cushion
1Two screws
(+BVTP 3 x 12)
3Four screws
(+BVTP 3 x 12)
CN2601

GDM-FW9010(NE) 1-12
3When one side of the rubber cap is
separated from the anode button, the
anode-cap can be removed by turning up
the rubber cap and pulling up it in the
direction of the arrow c.
•HOW TO HANDLE AN ANODE-CAP
1Don’t scratch the surface of anode-caps with sharp shaped
material!
2Don’t press the rubber hardly not to damage inside of anode-
caps!
A material fitting called as shatter-hook terminal is built in the
rubber.
3Don’t turn the foot of rubber over hardly!
The shatter-hook terminal will stick out or damage the rubber.
•REMOVAL OF ANODE-CAP
NOTE: Short circuit the anode of the picture tube and the anode cap to the metal chassis, CRT shield or carbon painted on the CRT, after
removing the anode.
•REMOVING PROCEDURES
1Turn up one side of the rubber cap in the
direction indicated by the arrow a.2Using a thumb pull up the rubber cap
firmly in the direction indicated by the
arrow b.
a
bc
Anode Button

GDM-FW9012(E) 2-1
Part Replaced ([)
RV901
SECTION 2
SAFETY RELATED ADJUSTMENT
When replacing or repairing the shown below table, the following
operational checks must be performed as a safety precaution against X-
rays emissions from the unit.
* Confirm one minute after turning on the power.
HV ADJ
HV Regulator
Circuit Check
HV Protector
Circuit Check
Beam Current
Protector Circuit
Check
Part Replaced (])
D Board C901, R923, R924,
R929, R943, T902(FBT)
• Mounted D Board
D Board C922, C926, D912,
D915, D921, Q907,
Q908, R921, R922,
R932, R937, R939,
T902(FBT)
• Mounted D Board
D Board C921, C933, D901,
D913, R920, R928,
R930, 931, T902(FBT)
• Mounted D Board
N Board IC001, R031, R032
• Mounted N Board
a) HV Regulator Circuit Check
1) Enter black crosshatch signal (black on white background), and check
that high voltage is in the specified range.
[Specification]: 28.50 ±0.10 kV
2) Check that the voltage of D912 cathode on the D board is 29.0 V or
more.
b) HV Protector Circuit Check
1) Enter black crosshatch signal (black on white background).
2) Apply the specified voltage to the D912 cathode on the D board, and
check that high voltage is 0.1 kV or less.
[Specification]: 34.00 + 0.00/– 0.05 V
c) Beam Current Protector Circuit Check
(1st Protector): D Board
1) Apply 4.5 V DC to CN504 0pin on the D board, and check high
voltage value.
2) Connect constant current source to a section between T902 (FBT) qapin
and qspin (GND) on the D board, and check that high voltage checked in
1) lowers by 1.50 kV or more when the specified current flows to the qa
pin.
[Specification]: 2.00 + 0.00/– 0.01 mA
d) Beam Current Protector Circuit Check
(2nd Protector): D Board
1) Connect constant current source to a section between T902 (FBT) qapin
and qspin (GND) on the D board, and check that the voltage of CN504 0
pin becomes 0 V or less when the specified current flows to the qa pin.
[Specification]: 1.63 + 0.00/– 0.01 mA