Sony KV-G21MW3 Service Manual ▷ View online
MODEL
COMMANDER DEST.
CHASSIS NO.
MODEL
COMMANDER DEST.
CHASSIS NO.
KV-G21MW3
RM-869 ME
SCC-U07U-A
KV-G21QW3
RM-869 ME
SCC-U07T-A
SERVICE MANUAL
BG-2S
CHASSIS
TRINITRON
®
COLOR TV
– 2 –
KV-G21MW3/G21QW3
RM-869
Note
Power requirements
110-240 V AC, 50/60 Hz
Power consumption (W)
Indicated on the rear of the TV
Television system
B/G
KV-G21QW3
B/G, I, D/K, M
KV-G21MW3
Color system
PAL, PAL 60, SECAM, NTSC4.43, NTSC3.58
KV-G21MW3
PAL, PAL 60, SECAM, NTSC4.43
KV-G21QW3
Channel coverage
VHF: E2 to E12 / UHF: E21 to E69 / CATV: S01 to S03, S1 to S41
Audio output (speaker)
3W + 3W
Inputs
˘ (antenna): 75 ohms external terminal
… (video input) jacks: phono jacks
D (video): 1 Vp-p, 75 ohms
D (video): 1 Vp-p, 75 ohms
≥
(audio): 500 mVrms, high impedance
Outputs
A (earphone) jack: mini jack
Ú (monitor output) jacks: phono jacks
D (video): 1 Vp-p, 75 ohms
D (video): 1 Vp-p, 75 ohms
≥
(audio): 500 mVrms
Picture tube
21 in.
Tube size (cm)
54
Measured diagonally
Screen size (cm)
51
Measured diagonally
Dimensions (w/h/d, mm)
516
×
464
×
478
Mass (kg)
22
Design and specifications are subject to change without notice.
SPECIFICATIONS
CAUTION
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.
THE ANODE CAP TO THE METAL CHASSIS, CRT SHIELD, OR
CARBON PAINTED ON THE CRT, AFTER REMOVING THE
ANODE.
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY SHADING AND MARK
!
ON
THE SCHEMATIC DIAGRAMS, EXPLODED VIEWS AND IN THE
PARTS LIST ARE CRITICAL TO SAFE OPERATION. REPLACE
THESE COMPONENTS WITH SONY PARTS WHOSE PART
NUMBERS APPEAR AS SHOWN IN THIS MANUAL OR IN
SUPPLEMENTS PUBLISHED BY SONY.
PARTS LIST ARE CRITICAL TO SAFE OPERATION. REPLACE
THESE COMPONENTS WITH SONY PARTS WHOSE PART
NUMBERS APPEAR AS SHOWN IN THIS MANUAL OR IN
SUPPLEMENTS PUBLISHED BY SONY.
– 3 –
KV-G21MW3/G21QW3
RM-869
TABLE OF CONTENTS
SELF DIAGNOSIS FUNCTION
..................................
4
1. GENERAL
....................................................................
5
2. DISASSEMBLY
2-1.
Rear Cover Removal ............................................
10
2-2.
A Board Removal ................................................
10
2-3.
Service Position ...................................................
10
2-4.
Replacement of Parts ...........................................
11
2-4-1.
Replacement of Multi Button ....................................
11
2-4-2.
Replacement of Light Guide .....................................
11
2-5.
Terminal Board Bracket Removal .......................
11
2-6.
Demagnetization Coil Removal ..........................
11
2-7.
Picture Tube Removal ..........................................
12
3. SET-UP ADJUSTMENTS
3-1.
Beam Landing ......................................................
13
3-2.
Convergence .........................................................
14
3-3.
Focus Adjustment ................................................
15
3-4.
Remote Commander Adjustment ........................
16
3-5.
G2 (Screen) and White Balance Adjustments .....
16
4. CIRCUIT ADJUSTMENTS
4-1.
Adjustments with Commander ............................
17
4-2.
Adjustment Method .............................................
18
4-3.
A Board Adjustment after IC003 (Memory)
Replacement .........................................................
Replacement .........................................................
23
4-4.
Picture Distortion Adjustment .............................
23
5. DIAGRAMS
5-1.
Block Diagram ......................................................
25
5-2.
Circuit Boards Location .......................................
28
5-3.
Schematic Diagrams and Printed Wiring Boards
28
(1)
Schematic Diagram of A Board ...........................
33
(2)
Schematic Diagram of C Board ...........................
37
5-4.
Semiconductors .....................................................
41
6. EXPLODED VIEW
6-1.
Chassis ..................................................................
43
7. ELECTRICAL PARTS LIST
....................................
45
Section
Title
Page
Section
Title
Page
– 4 –
KV-G21MW3/G21QW3
RM-869
If no acknowledgement is returned from a device which is turned "ON", the device has a problem.
In this case, one of the LED's responding to the problem device will flicker a defined number of times.
Flickering is operated by lighting the LED's for 60ss each time.
The flickering frequency responding to each failed device is shown below.
SELF DIAGNOSIS FUNCTION
Board name
Ref. No.
Device
Flickering Frequency
A Board
IC003
NONVOLATILE
MEMORY
(ST24C08FB6)
1
A Board
IC300
Y/C JUNGLE
(TDA8374A)
3
All the devices are checked one after another from the left of the table.
If an error is found, the responding LED will start flickering.
So, if more than 1 device have failed, only the one on the left side will flicker.