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...

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...

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...

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...

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...

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...

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...

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...

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