Sony Monitor Gdm F520 Manual

							CHASSIS
SERVICE MANUAL
SPECIFICATIONS
GDM-F520
CR1
AEP ModelUS Model
Canadian Model
Chassis No. SCC-L33D-A
TORINITORON® COLOR GRAPHIC DISPLAY
CRT
0.22 mm aperture grille pitch, 90-degree deflection, FD Trinitron 
21 inches measured diagonally
Viewable image size Approx. 403.8 × 302.2 mm (w/h) (16  × 12 inches) 
19.8 viewing image
Resolution (H:Horizontal, V:Vertical) Maximum: H: 2048 dots, V: 1536 lines
Recommended: H: 1600 dots, V: 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 kΩ, Polarity free
Sync on Green: 0.3 Vp-p (negative)
Standard image area Approx. 388 × 291 mm (4:3) 
(15 
3/8  ×  11 1/2 inches) or 
Approx. 364  × 291 mm (5:4) 
(14 
3/8  ×  11 1/2 inches)
Deflection frequency  (H:Horizontal, V:Vertical) H: 30 to 137 kHz, V: 48 to 170 Hz AC input voltage/current
100 to 240 V, 50 – 60 Hz, 2.0 – 1.0 A
Power Consumption (with no USB devices connected) Approx. 145 W
Operating temperature
10 ºC to 40 ºC
Dimensions Approx. 497  × 499  × 487 mm (w/h/d)
 (19 
5/8  ×  19 3/4 ×  19 1/4 inches)
Mass Approx. 30 kg (66 lb 2 oz)
Plug and Play DDC2B/DDC2Bi
Supplied accessories Power cord
HD15 video signal cable
USB cable
Exclusive Power Mac G3/G4 adapter
This instruction manual
Design and specifications are subject to change without notice.  
						

							GDM-F520(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, s\
oanalog 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 saf\
ety
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, screw\
s, 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  µF
\bC
Vo\ftmeter
(0.75 V)
To Exposed Meta\f
Parts on Set
Earth Ground
SAFETY  CHECK-OUT  
						

							GDM-F520(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 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.
Note: Hand degauss 
must be used on stand-by or power-off condition.
This model has an automatic earth magnetism correction function
by using an earth magnetism sensor and a LCC coil. When using a
hand degauss while monitor (LCC coil) is being operated, it some-
times gets magnetized, and the system may not work properly as a
result.  
						

							GDM-F520(E) 4
POWER  SAVING  FUNCTIONThis monitor meets the power-saving guidelines set by VESA, TCO’99, 
and 
ENERGY 
STAR. If no signal is input to the monitor from your 
computer, the monitor will automatically reduce power consumption as 
shown below.
*
1Figures reflect power consumption when no USB compatible 
peripherals are connected to the monitor.
*2When your computer enters power saving mode, NO SIGNAL appears 
on the screen. After a few seconds, the monitor enters power saving 
mode.
*3“Deep sleep” is power saving mode defined by the Environmental 
Protection Agency. 
Power mode Power consumption
*
1
! (power) 
indicator
normal operation ≤ 145 W  green
active off*
2
(deep sleep)*
3
≤  3 W orange  
						

							GDM-F520(E) 5
DIAGNOSIS
Failre
+B failure
Horizontal / Vertical Deflection failure,Thermal protector
ABL protectorHV failureAging / Self TestOut of scan range
Power LED
Amber →Off
(0.5 sec) (0.5 sec)
Amber →Off(1.5 sec) (0.5 sec)
Amber →Off(0.5 sec) (1.5 sec)
Amber →Off →Amber →Off(0.25 sec) (0.25 sec) (0.25 sec) (1.25 sec)
Amber →Off →Green →Off(0.5 sec) (0.5 sec) (0.5 sec) (0.5 sec)
Green (OSD indication)
Aging Mode (Video Aging) : During Power Save, press MENU button for longer than 2 second.
Self Test (OSD Color Bar) : During Power Save, push up Control button for longer than 2 second.
Reliability Check Mode : During Power Save, push down Control button for longer than 2 second.  
						

							GDM-F520(E) 6
TIMING  SPECIFICATIONMODE AT PRODUCTION
MODE 1 MODE 2 MODE 3 MODE 4
RESOLUTION
640 X 480 1600 X 1200 1920 X 1440 1920 X 1440
CLOCK
25.175 MHz 229.500 MHz 341.000 MHz 297.000 MHz
 — HORIZONTAL —
H-FREQ
31.469 kHz 106.250 kHz 128.485 kHz 112.500 kHz usec usec usec usec
H. TOTAL
31.778 9.412 7.783 8.889
H. BLK
6.356 2.440 2.152 2.424
H. FP 0.636 0.279 0.457 0.485H. SYNC
3.813 0.837 0.622 0.754
H. BP
1.907 1.325 1.073 1.185
H. ACTIV
25.422 6.972 5.630 6.465
 — VERTICAL —
V. FREQ (HZ)
59.940 Hz 85.000 Hz 84.977 Hz 75.000 Hz lines lines lines lines
V. TOTAL
525 1250 1512 1500
V. BLK
45 50 72 60
V. FP
10 1 1 1
V. SYNC
233 3
V. BP
33 46 68 56
V. ACTIV
480 1200 1440 1440
 — SYNC  —INT(G)
NO NO NO NO
EXT (H/V) /POLARITY
YES N/N YES P/P YES P/P YES N/P
EXT (CS) /POLARITY
NO NO NO NO
INT/NON INT
NON INT NON INT NON INT NON INT
2000.8.9 VER.  
						

							GDM-F520(E) 7
1. DISASSEMBLY
1-1. Cabinet Assembly Removal ................................. 1-1
1-2. A2 Board (C Block) Removal .............................. 1-2
1-3. A2 Board, US Board Removal ............................. 1-3
1-4. Bezel, H2 Board, Magnetic Sensor Removal ....... 1-4
1-5. D Board Removal ................................................ 1-5
1-6. Service Position .................................................... 1-6
1-7. Picture Tube Removal ........................................... 1-7
1-8. Harness Location ................................................. 1-9
2. SAFETY  RELATED  ADJUSTMENT
................ 2-1
3. ADJUSTMENTS
...................................................... 3-1
4. DIAGRAMS
4-1. Block Diagrams .................................................... 4-1
4-2. Frame Schematic Diagram .................................... 4-4
4-3. Circuit Boards Location ........................................ 4-5
4-4. Schematic Diagrams and Printed Wiring Boards ................................................................... 4-6
TABLE  OF  CONTENTS
Section
Title
Page
Section
Title
Page
(1) Schematic Diagram of A2 Board ......................... 4-8
(2) Schematic Diagrams of D ( a, b , c ) Board .... 4-10
(3) Schematic Diagram of DA Board ........................ 4-14
(4) Schematic Diagram of H2 Board ......................... 4-16
(5) Schematic Diagram of L2 Board ......................... 4-18
(6) Schematic Diagram of N Board ............................ 4-20
(7) Schematic Diagram of US Board .......................... 4-22
4-5. Semiconductors .................................................... 4-24
5. EXPLODED  VIEWS
.............................................. 5-1
5-1. Chassis ................................................................. 5-2
5-2. Picture Tube ......................................................... 5-3
5-3. Packing Materials ................................................. 5-4
6. ELECTRICAL  PARTS  LIST
............................... 6-1  
						

							GDM-F520(E) 1-1
SECTION  1
DISASSEMBLY
1-1. CABINET ASSEMBLY REMOVAL
1
B
B
A
A
C
CTwo screws
(+BVTP 4 x 16)
6
Slide the EMI shield in the direction
of arrow     and remove four claws.
7
EMI shield 
5
Three screws
(+BVTT 4 x 8)
4
Four screws
(+BVTT 4 x 8) Two claws
3
Push the upper side of the cabinet assembly
in the direction of arrow    , disconnect claws, 
then remove the cabinet assembly
lifting it up in the direction of arrow    .
Bezel
EMI shield
Cabinet assembly
Cabinet assembly
Bezel
Push in the tip of a screwdriver
about 10mm to unlock the claw.
22  
						

							GDM-F520(E) 1-2
1-2. A2 BOARD (C BLOCK) REMOVAL
1
A2 board (C block)
CN318
CN315GND  
						

							GDM-F520(E) 1-3
1-3. A2 BOARD, US BOARD REMOVAL
Two screws
(+BVTT 4 x 6)
2
Video block assembly
11
Screw (+BVTT 4 x 8)
Five screws
(+BVTT 3 x 8)
USB case
15
US board
12
USB block assembly
3
Four screws
(+BVTP 3 x 8)
Video shield
Two screws (HEX)
Screw
(+BVTP 3 X 8)
7
Video case
9
Terminal board 
assembly
10
A2 board
CN315
CN313
CN2601
1
4
5
6
Two screws 
(+BVTT 3 X 8)
8
13
14