Panasonic TX-20LA70F / TX-20LA70P / TX-20LA7F / TX-20LA7P Service Manual ▷ View online
Adjustment Method
How to enter Service 1
•
Set the Bass to maximum position, set the Treble to minimum position then keep pressing the INDEX button on the
remote control and press the down button (-/v) on the TV set, this will place the TV set into the Service Mode 1.
remote control and press the down button (-/v) on the TV set, this will place the TV set into the Service Mode 1.
Key Command
• Press
the
RED / GREEN buttons to step up / down through the functions.
• Press
the
YELLOW / BLUE buttons to alter the function values, to alter White Rasters use +/- buttons
• Press
the
OK button after each adjustment has been made to store the required values.
•
To exit the Service Mode, press the "N" button.
Keep adjusting sequence: DVCO, Sub-Contrast, other items.
Item
Setting indication
Note: All setting values are approximate
Settings / Special features
Sub-Contrast
Sub-Contrast
32
Receive a 80% white level Philips Pattern with correct
sound system (B/G, D/K) via aerial input. For Sub-
Contrast alignment press "Blue" button, wait until the
figure colour is changed from red to black colour.
Press the OK.
DVCO
DVCO
63
Receive a 80% white level Philips Pattern via aerial
input. For DVCO alignment press "Blue" button, wait
until the figure colour is changed from red to black
colour. Press the OK.
Highlight
Lowlight
For correct setting see White Balance Adjustment
Sub-Brightness
Sub-Brightness
-5
Optimum setting.
White Balance Adjustment
Instrument
• Remote
Control
•
LCD WB meter (Minolta CA-210 or equivalent)
Condition
•
Switch on the TV Set. Enter Service1. Step down to Highlight line and keep the aging time more than 20 minutes.
Procedure
•
After aging time above set White Raster No.12 for Highlight and No.4 for Lowlight
Press the OK button
to store.
•
Put Minolta Sensor to the center of the LCD Panel with 25mm gap between Minolta Sensor and LCD Panel. Adjust "x"
and "y" values by changing Red and Blue values.
and "y" values by changing Red and Blue values.
• Press
OK button to store setting.
High
12
0410
0410
0410
Low
4
0064
0064
0064
High
12
Low
4
Item Value
x
2850
±150
Highlight
y
2940
±150
x
2860
±150
Lowlight
y
2900
±150
9
10
Video & Stereo Audio Block Diagram
IC1501
TUNER
T
U
001
V
IDE
O OUT
2
1
SIF
_O
U
T
11
A
M
10
15,1
6
A
M
31
191
T
UNER CVB
S
IN
SIF
L
R
JK3002
26
25
M
O
NITOR OUT
R
M
O
NITOR OUT
L
M
O
NITOR OUT
1
3
2
6
7
11
15
20
AV1 21 PIN SCART
JK3000
L OUT
R OUT
R IN
L IN
B IN
G I
N
R IN
CVB
S
IN
CVB
S
OUT
19
AV
1
R
O
U
T
23
9
AV
1
R
I
N
24
AV
1
L
O
U
T
10
AV
1
L
I
N
179
A
V
1 BLUE IN
AV
1
G
R
E
E
N
I
N
180
A
V
1 RED/
C
IN
181
A
V
1 CVB
S
IN
190
AV
1
C
V
B
S
O
U
T
195
R
L
V
L
R
Y
C
13
AV
3
R
I
N
AV
3
L
I
N
14
A
V
3 CVB
S
IN
182
188
AV
3
Y
I
N
AV
3
C
I
N
187
IC 251
A
UDIO
A
M
P.
SPK
L
SPK
R
28
27
2
4
A5
R
L
SPK
O
U
T
R
8
9
SPK
O
U
T
L
-
SPK
R R
+
11
12
SPK
O
U
T
R -
SPK
O
U
T
L
SPK
R L
+
4
1
2
3
IC 1120
EEPRO
M
168
7
WR
E
N
VCT6753
G
A
UDIO
VIDEO
T
E
X
T
PRO
C
E
SSO
R
A
–
BOA
RD
B BUS
G BUS
R BUS
TO LCD PANEL
129,
130
,13
1,
132,
135,
136
141,
142
,14
3,
144,
145,
146
153,
154
,15
5,
156,
157,
158
AV
2
A6
17-23
7-13
27-33
JK3600
HP
Control Block Diagram
IC1501
167
91
89
161
202
1
VCT6753
G
A
UDIO
VIDEO
T
E
X
T
PRO
C
E
SSO
R
TUNER
T
U
001
C
S
L
5V
13
SD
A
5
V
14
8
AV1 21 PIN SCART
JK3000
SL
O
W
A2
6
7
A8
2
1
3
AV
1
S
L
O
W
3
Q1700 / Q1701
PA
N
E
L
O
N
A7
16
18
20
1
P2
16
18
20
1
2
2
90
162
PW
M
O
U
T
INVE
RT
ER O
F
F
INV PSU
O
N
KEY
S
C
A
N
Q1100
LE
V
E
L SH
IFT
E
R
SERVICE CONNECTOR
IC 1120
EEPRO
M
SCL
3
V3
A
UDI
O M
UTE
A
UDIO M
U
T
E
KEYSCA
N
NOT
ST
B
Y
Q841
NOT
ST
B
Y
Q842
Q843
INV PSU
O
N
INVERTER
205
ON LE
D
IR
208
ST
BY
LED
V2
2
1
3
D1051
G
R
RM
1050
REM
O
T
E
IR
P
–
BO
A
R
D
V
–
BO
A
R
D
PROTECTI
ON
7
IC 251
AU
D
AM
P
.
83
6
5
7
WR
E
N
SD
A
3
V3
84
SD
A
3
V3
A
–
BOA
R
D
201 SD
A
INT
168
2
205
BUS REQU
EST
Q952
INVE
RT
ER O
N
11
12
Power Supply Block Diagram
F 800
SW 800
P1
1
1
4
LINE
FILTER
LF 800
-
D801
~
IC800
M
A
IN
P
S
CONT
ROL
7 9
5
3
2
4
1
T
800
12
10
PC
801
PC
802
8
P2
14
,13
,12
4
,6
Q802
7
IC840
6
5
F840
1
12V
24
V
4
3
Q843
INVERTER
A
7
14
,13
,12
4
,6
Q873
A
U
D
9V_16V
Q890
12V
8V
D
875
D
876
30V
IC881
24V
5V
LCF´S
V
SU
PD
IG 3,3V
V
SU
PD
R
I 3,
3V
V
SU
PC
OM
3,
3V
V
SU
PIO
1
3,
3V
V
SU
PIO
3
3
,3V
V
SU
PVO 3
,3V
V
SU
PFE 3
,3V
V
SU
PDA
C
3
,3V
V
SU
PLVD
S 3
,3V
IC862
STB
Y
3.3V
IC861
STB
Y
1.8V
V
SU
PD
IG 1.8V
V
SU
PFE 1.8V
LCF´S
LCF
V
SU
P
A
U
8V
IC1501
33
36
45,7
5
77
86
,96
,11
4
124
133,
15
0
164
169
,18
5
170
192
197
V
SU
PSIF 5V
V
SU
PD
IG 3
,3V
V
SU
PD
R
I 3
,3V
VSU
PC
OM
3,
3V
V
SU
PIO
1
3,
3V
VSU
PD
IG
1,8V
V
SU
PLVD
S 3,3
V
VSU
PDA
C
3,3
V
V
SU
PFE 1,8V
VSU
PFE 3,3V
VSU
PVO 3,3
V
V
SU
PIO
3
3
,3V
A
U
D
IO
VID
E
O
P
R
O
C
E
SSO
R
IC251
AUDIO
AM
P
5V
A
U
D
9V_16V
TUNER
TU001
30V
5V
IC1120
E
E
P
R
O
M
7
5
8
STB
Y
3.3V
Q170
1
5V
P
A
N
E
L 5V
A
6
42-45
24V
A8
5
V2
5
STB
Y
3.3V
RM1050
STB
Y
3.3V
Q800
LCF
VSU
PSIF 5V
18
VSU
PA
U
8
V
A2
1
SERVICE
STB
Y
3.3V
PROTECTION
ST
BY
3.3V
5V
8V
30V
M
A
IN
IN
P
–
BO
A
R
D
A
–
BOA
R
D
V
–
BO
A
R
D
PANEL
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