Sony KV-28WF3A Service Manual ▷ View online
22
KV-28WF3/32WF3
B
G
R
B
G
R
B
G
R
H M C c o r r e c t i o n ( A )
H M C c o r r e c t i o n ( B )
A < B
A = B
R G
B
R G B
A > B
A = B
R
G B
R G B
C < D
C = D
C > D
C = D
R
G
G
B
C
D
C
D
R
G
B
R
G
B
R
G
B
V M C c o r r e c t i o n ( A )
V M C c o r r e c t i o n ( B )
Y-splitting axis correction magnet
V STAT convergence magnet
BMC (Hexaploe) magnet
Purity magnet
a
b
c
d
Permalloy Assy
X-4387-214-1
X-4387-214-1
Convergence adjustment with permalloy
c).
By rotating the V.STAT magnet clockwise, the red, green and
blue dots move in the direction indicated below.
blue dots move in the direction indicated below.
d).
By opening or closing the V.STAT magnet, the red, green and
blue dots move in the direction indicated below.
blue dots move in the direction indicated below.
Note :
If the blue dot does not coincide with the red and
green points correct the points by using the BMC
[Hexapole] magnet.
green points correct the points by using the BMC
[Hexapole] magnet.
e).
Correction for HMC [horizontal mis-convergence] and
VMC [vertical mis-convergence] by using the BMC
[Hexapole] magnet.
VMC [vertical mis-convergence] by using the BMC
[Hexapole] magnet.
5.
HMC correction by BMC [Hexapole] magnet and movement
of the electron beam.
of the electron beam.
a).
VMC correction by BMC [Hexapole] magnet and movement
of the electron beam.
of the electron beam.
Layout of each control
Fig 3-5
Note :
If you are unable to adjust the corner convergence
properly, this can be corrected with the use of
permalloys.
properly, this can be corrected with the use of
permalloys.
a-d: screen-corner
convergence defect
convergence defect
a
b
c
d
23
KV-28WF3/32WF3
FOCUS
3-3. FOCUS
1.
Receive a television broadcast signal.
2.
Normalize the picture setting.
3.
Adjust the focus control located on the flyback transformer to
obtain the best focus at the centre of the screen.
Bring only the centre area of the screen into focus, the
magenta-ring appears on the screen. In this case, adjust the
focus to optimize the screen uniformly.
obtain the best focus at the centre of the screen.
Bring only the centre area of the screen into focus, the
magenta-ring appears on the screen. In this case, adjust the
focus to optimize the screen uniformly.
3-4. SCREEN (G2), WHITE BALANCE
[Adjustment in the service mode using the remote
commander]
commander]
G2 adjustment (RV702)
1.
Input a dot signal from the pattern generator.
2.
Set the Picture, Brightness and Colour to minimum.
3.
Apply 170V DC from an external power supply to the
R, G and B cathodes of the CRT.
R, G and B cathodes of the CRT.
4.
Whilst watching the picture, adjust the G2 control
RV701 [SCREEN] located on the C Board to the point
just before the flyback return lines disappear.
RV701 [SCREEN] located on the C Board to the point
just before the flyback return lines disappear.
White balance adjustment
1.
Input an all-white signal.
2.
Enter into the Service Mode by pressing ‘TEST’,
‘TEST’ and ‘MENU’ on the Service Commander.
‘TEST’ and ‘MENU’ on the Service Commander.
3.
Select ‘VIDEO PROC’ from the on screen menu
display and press ‘OK’.
display and press ‘OK’.
4.
The ‘VIDEO PROC TDA4780’ menu will appear on
the screen.
the screen.
Video Proc. TDA4780
5.
Set the picture to MAX.
6.
Switch the Blue Stretch OFF.
7.
Set the ‘R GAIN’ to 31.
8.
Adjust the ‘G GAIN’ and ‘B GAIN’ so that the white
balance becomes optimum.
balance becomes optimum.
9.
Press the ‘OK’ button to write the data for each item.
10.
Set the picture to MIN.
11.
Set the ‘R LVL REF’ to 31.
12.
Adjust the ‘G LVL REF’, and ‘B LVL REF’ with the
left and right buttons on the remote commander so that the
white balancebecomes optimum.
left and right buttons on the remote commander so that the
white balancebecomes optimum.
13.
Press the ‘OK’ button to write the data for each item.
14.
Switch the Blue Stretch to ON.
Item No
Adjustment item
Data Amount
1
BRT
31
2
COL
31
3
PIC
53
4
HUE
31
5
R GAIN
31
6
G GAIN
Adj
7
B GAIN
Adj
8
R LVL REF
31
9
G LVL REF
Adj
10
B LVL REF
Adj
11
PEAK DRV LIMIT
48
12
GAMMA
0
13
SCP ON = 3LEV OFF = 2LEV
OFF
14
DELAY
OFF
24
KV-28WF3/32WF3
SECTION 4
CIRCUIT ADJUSTMENTS
VOL PROG
AV INPUT
AV INPUT
Headphone
jack
jack
4-1. ELECTRICAL ADJUSTMENTS
Service adjustments to this model can be performed
using the supplied Remote Commander RM-862.
using the supplied Remote Commander RM-862.
HOW TO ENTER INTO SERVICE MODE
1.
Turn on the main power switch of the set while pressing
PROG + (plus) and PROG - (minus) buttons on the front
panel.
PROG + (plus) and PROG - (minus) buttons on the front
panel.
2.
"TT" will appear in the upper right corner of the
screen.
screen.
3.
Press the ‘MENU’ button on the remote commander to
obtain the service menu on the screen.
obtain the service menu on the screen.
4.
Push the joystick up (green) or down (blue) on the remote
commander to select the adjustment item.
commander to select the adjustment item.
5.
Press the centre button to proceed to the next menu.
6.
If the required adjustment item is ‘Video Proc’, push the down
button to move to ‘Video Proc’.
button to move to ‘Video Proc’.
7.
The Menu indicated in Fig 4-3 will appear on the screen.
8.
Move the joystick up or down to move to the adjustment item
and press the centre (OK) button.
and press the centre (OK) button.
9.
Change the data in order to comply with each standard.
Fig 4-3
DEVICES
Init TV
Pip, Lumisponder & Autoside
Sub Adjust
Video Proc
TDA4780
Col Dec Main
TDA9144
Deflect. Cont
SDA9361
Col Dec Sub
TDA9143
Feature Box
S87C654
AI
TDA9170
DA
SDA9280
Single PIP
SDA9288
Sound
Line23 det
Item No
Adjustment item
Data Amount
1
BRT
31
2
COL
31
3
PIC
53
4
HUE
31
5
R GAIN
31
6
G GAIN
Adj
7
B GAIN
Adj
8
R LVL REF
31
9
G LVL REF
Adj
10
B LVL REF
Adj
11
PEAK DRV LIMIT
48
12
GAMMA
0
13
SCP ON = 3LEV OFF = 2LEV
OFF
14
DELAY
OFF
15
DATA BUFF
OFF
16
NTSC MATRIX
OFF
17
HDTV
OFF
18
FSBL
OFF
19
AUTO CUT OFF
ON
20
FSW 2 DIS
OFF
21
FSW 2
OFF
22
FSW 1 DIS
OFF
23
FSW 1
OFF
24
ADAPT BLACK
OFF
25
Y HIGH 1V
OFF
26
MOD2
OFF
27
BLUE STRETCH
During White Balance
adjustment OFF, After
adjustment OFF, After
W/B adjustment ON
28
VM OUT
OFF
29
PEAK DRV ABS
ON
30
TIME CNST PEAK LIMIT
OFF
KV-28WF3/32WF3
25
SDA9361 (VIDEO PROC)
Item No
Adjustment item
Data Amount
1
V Size
Adj
2
V Centre
Adj
3
V Linearity
Adj
4
S Correction
Adj
5
H Size
Adj
6
Pin Amp
Adj
7
Up Corner Correction
Adj
8
Low Corner Correction
Adj
9
V Bow
Adj
10
Pin Phase
Adj
11
V Angle
Adj
12
HDE
ON
13
VR
0
14
RABL
ON
15
Blk Dis
OFF
16
2FH 2xLine Freq
ON
17
Stand-by Mode
OFF
18
Vertical
ON
19
BSE Blk Select
OFF
20
SSE Start Scan
OFF
21
SRSE Start Red Scan
OFF
22
GBE Guard Board
OFF
23
STE Scan time table
OFF
24
NSA Self Adaption
ON
25
V EHT comp
28” = 111
32” = 90
26
H EHT comp
28” = 85
32” = 90
32” = 90
27
H Centre
32
28
PWM Start
0
Item No
Adjustment item
Data Amount
29
D/A
0
30
V Blk Time
27
31
H Blk Time
41
32
Start V Scan
0
33
H Blk Phase
61
34
V Scan width 0
0
35
V Scan width 1
0
36
Guard Band
0
37
Start Red Scan
0
38
Number fields
1
39
NI Non Interface
OFF
40
NR V Sync Noise Red
OFF
41
SSC with VBL
ON
42
Min lines/field
0
43
Max lines/field
0
44
AFC EHT comp
0
45
PLL Freq
6
46
VCR
ON
47
Gen Mode
OFF
48
HSWID
ON
49
Int H Phase
Adj
50
PWM width
0
51
Noisy VCR
OFF
52
Killzip
OFF
53
tc3rd
OFF
54
Bandgap 4 off
OFF
55
Bandgap off
OFF
56
Bandgap
0
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