Panasonic TC-20LA5 / TC-20LE5 Service Manual ▷ View online
7 Measurements and Adjustments
7.1. Video Signal Level Adjustment
Instrument Name
Connect to
Remarks
1.
Remote controller
2.
RF signal
3.
SG
1. Receive studio color bar by RF signal input.
(Viewing mode: standard, LCD AI: OFF, Back Light: +30 )
2. Enter into Main adjustment in the plant adjustment mode, push for one second "8" on the remote controller and make automatic
adjustment of video signal level.
7.2. LCD GAMMA Adjustment
Instrument Name
Connect to
Remarks
1.
Remote controller
2.
LCD WB meter (Minolta CS-1000 equivalent)
3.
Communication jig
4.
Computer for external control
· After 30 minutes aging complete white balance adjustment.
1. Enter into WB adjustment in the plant adjustment mode and measure the WHITE brightness data to check that it is higher than
1. Enter into WB adjustment in the plant adjustment mode and measure the WHITE brightness data to check that it is higher than
300 cd /m
2
.
(Viewing mode: standard, LCD AI: OFF, Back Light: +30 )
(When it is below 300 cd /m
(When it is below 300 cd /m
2
, make re-measurement in 30 minutes after cold-on.)
2. Measure white brightness data and chromaticity coordinate, decide "Standard color 1" and "Standard color 2" at adjustment
peak.
3. Set up objective of coordinate, select two color R-GAIN or G-GAIN or B-GAIN but no use standard color (=0xff), display white
color. When adjustment is not required normal, select two color R-GAIN or G-GAIN or B-GAIN but no use standard color (=0xff).
<< objective of coordinate (x0, y0) = (0.277 ± 0.002, 0.279 ± 0.002) >>
<< objective of coordinate (x0, y0) = (0.277 ± 0.002, 0.279 ± 0.002) >>
Standard color 1/2
RED
GREEN
BLUE
x direction
B-GAIN [1]
R-GAIN [2]
R-GAIN [1]
y direction
G-GAIN [2]
B-GAIN [1]
G-GAIN [2]
· When turn up R-GAIN and G-GAIN chromaticity coordinate get bigger, When turn up B-GAIN chromaticity coordinate get
smaller.
· When adjust for remote control select R-GAIN, G-GAIN and B-GAIN by pressing "3" and "4",and change for "volume +" and
"volume -".
· Adjust preferentially [1] ,converge simply.
4. Set up objective of coordinate, select R-CENT and B-CENT, set standard color green (=0x80), display gray color.
Standard color
GREEN
Adjustment direction
x direction
R-GAIN
When turn up chromaticity coordinate get bigger.
y direction
B-GAIN
When turn up chromaticity coordinate get smaller.
· When adjust for remote control select R-GAIN, G-GAIN and B-GAIN by pressing "3" and "4", and change for "volume +" and
"volume -".
5. Write the values converge objective of coordinate above in the gamma data part in EEPROM.
· When adjust for remote control, push for one second "8" on the remote controller with R-GAIN, G-GAIN and B-GAIN. (OSD
is flash red on upper left of display.)
6. Check that the chromaticity coordinate, at white and gray, are within the values given below.
x= 0.277 ± 0.003
y= 0.279 ± 0.003
13
TC-20LA5 / TC-20LE5
7.3. MTS Adjustment
Caution:
MTS adjustment shall be after the aging of 30 minutes or longer.
7.3.1. RF Audio Input level Adjustment
Instrument name
Connection
Remarks
1. Filter jig
2. RF signal generator
3. RMS voltage meter
2. RF signal generator
3. RMS voltage meter
TP3572 - GND
RF ANT. INPUT
Filter jig
RF ANT. INPUT
Filter jig
Filter jig
1. Apply following RF signal at Antenna input.
VIDEO : Flat field, 30 % modulation
AUDIO : 300 Hz, 100 % modulation, monaural
(70 dB ± 5 dB, 75
AUDIO : 300 Hz, 100 % modulation, monaural
(70 dB ± 5 dB, 75
W, P/S 10 dB)
Note:
Make sure 75 us PRE-EMPHASIS is off.
2. Adjust "MTSIN" data (Input level) until the RMS voltage meter indicates 106 mVrms ± 6 mVrms.
7.3.2. Stereo Separation Adjustment
Instrument name
Connection
Remarks
1. RF signal generator
2. Oscilloscope
3. Headphone jig
2. Oscilloscope
3. Headphone jig
RF ANT. INPUT
TP3571 - GND
TP3571 - GND
Headphone jig
1. Select STEREO mode in the AUDIO Menu.
2. Set “Audio volume” DAC to “40”.
3. Apply following RF signal at Antenna input.
2. Set “Audio volume” DAC to “40”.
3. Apply following RF signal at Antenna input.
VIDEO : Flat field, 30% modulation
AUDIO : 300Hz, 30% modulation, STEREO (LEFT only)
(70dB ± 5dB, 75
AUDIO : 300Hz, 30% modulation, STEREO (LEFT only)
(70dB ± 5dB, 75
W OPEN, P/S 10dB)
Note:
After setting 30% modulation with PL SW and NR SW off, turn PL SW and NR SW on.
4. Adjust "SEPAL" data (Low-level separation) until the amplitude.
5. Apply following RF signal at Antenna input.
5. Apply following RF signal at Antenna input.
VIDEO : Flat field, 30% modulation
AUDIO : 3kHz, 30% modulation, STEREO (LEFT only)
(70dB ± 5dB, 75
AUDIO : 3kHz, 30% modulation, STEREO (LEFT only)
(70dB ± 5dB, 75
W OPEN, P/S 10dB)
Note:
After setting 30% modulation with PL SW and NR SW off, turn PL SW and NR SW on.
6. Adjust "SEPAH" data (High-level separation) until the amplitude of the waveform on the oscilloscope is minimum.
7. Repeat steps 3. to 6. until Low-level separation and High-level separation satisfy above-mentioned conditions.
7. Repeat steps 3. to 6. until Low-level separation and High-level separation satisfy above-mentioned conditions.
Note:
The separation must be more than 20 dB at 300Hz and 3kHz.
14
TC-20LA5 / TC-20LE5
8 Block Diagram
+
+
+
Y
PR
PB
RED
WHITE
+
A
V
_IN2
A
V
_IN1
R
V
L
V
L
R
Y
C
C
Y
+
PUSH
+
+
V1-V
V1-L
V2-V
V1-C
R
SOS
V1-R
V1-V
AGC_DET
SW
MAIN_SW
SDA1
V1-C
Y
SCL1
KEY
V1-L
V2-Y
PR
V1-R
V2-C
V2-Y
SW
TREBLE
TV-L
SDA1
PR
V2-V
PB
Y
5V(S)
V2-S
R
SCL1
V2-L
BASS
L
SCL1
V1-S
PB
L
V1-Y
V2-R
SDA1
V2-C
V1-Y
POWER_ON
TV-R
V2-S
V1-S
TV-L
TV-R
V2-L
V2-R
R23
1.62k
C939
Q2
C18
680u
680u
D10
D94
Z2
R26
6.65k
L904
C905
C13
2200p
R25
3.16k
A9
CN1
L902
D9
SW7
R20
2.2k
R12
150
150
RC2
R14
2.2k
RX1
56k
R17
33K
D12
JK3002A
Y-
S
W
Y
Y-
G
PB
PB-G
PR
PR-G
RC3
D923
R1045
D7
RC1
SW4
R905
JK3004
D13
C6
330u
RX2
0
JK3001
D912
D910
R19
1K
D051
D5
R24
2.32k
R98
47K
C21
1000u
R18
2.2K
2.2K
SW2
D053
R900
C11
0.1u
0.1u
C20
4700u
SW5
R950
D913
CX2
0.47u
D924
D93
D900
D909
D14
D052
R3
0.1
CN2
SW6
RC4
C19
220u
R22
1.74k
D11
D915
SW3
R27
14.3k
R16
330
330
R1151
R948
*
2
COMPONENT
+24V(INV)
ANT
VIDEO
12
5
4
VIDEO
COLD
OVP DET:HIGH(ABNORMAL)
2
2
COLD
3
MATRIX
V
59
SWITCHING REGULATOR
1
+32V
(13V)
VIDEO
21
DRIVE
R
VIDEO OUT
IC1008
27
VIDEO
CH
13
TV
3
ERROR DET
TV RELAY
4
18
S DET
13
4
VIDEO2
10
14
3
17
AVR
7
8
1
TA2
5
VIDEO
3
6
8
VIDEO
SY OUT
18
SW1
+9V(S)
4
V/Y OUT
Y
(S)
AUDIO
11
2
AUDIO
IC908
V
S DATA1
TREBLE
AUDIO
SCL
AUDIO
16
+5V(S)
11
PC91
+9V(S)
41
R
A2
BTL
POWER SUPPLY UNIT
9
2
TV-V
10
(22V)
6
PRESET
Pr OUT
51
(10V)
2
+5V(M)
CONTROL
L
COMPONENT1
R
8
6dB AMP
+11V(S) DET
T91
25
5V GENE.
6
VOL
+5V(S) DET
5
+32V
S2 DET
+9V(S)
11
+9V
S DET
IC901
29
24
POWER SWITCH
V/Y
(3.3V)
52
AUDIO
1
14
16
BUFFER
2
IC903
17
A BOARD
17
COLD
L
TV_V
1
+12V
7
PR
V/Y
8
-6dB
2
CH
SWITCH
REG+5V
HOT
TEMP SENSOR
3
KEY SCAN
1
S CLOCK
L-OUT
+24V(INV)
44
(10V)
1
VIDEO1
C
TREBLE
4
13
Q3001
Q3006
TV/VTR
TUNER
RECTIFIER
12
MAIN SW DET
+11V(S)
26
10
AFT
S_CLOCK
AFT
43
POWER
6
2
SDA
S2 DET
VIDEO1
6
57
15
61
TA1
49
1
11
FILTER
18
Pr
9
+24V(INV)
6
1
14
R-OUT
C/Pb OUT
MTS DEMODULATER
R OUT
L
POWER ON
+5V(M)
IIC
5
24
4
IC2201
L
6
13
+11V(S)
(5.6V)
S DATA
42
S CLOCK1
Z91
8
Q001
S_DATA
BASS/
R
CIRCUIT
C/Pb
IC3001
AGC CONT
AVR
8
19
+5V(S)
INPUT SELRCTOR
Q3008
DEMODU
19
L OUT
HOT
DD1
(22V)
2
11
STBY+5V
23
+30V(BT)
AUDIO OUT
TV_L
L
4
10
PB
STANDBY
22
6
(10V)
BASS
C
A1
+5V
Y
VIDEO2
TA BOARD
5
28
AC CORD
Pr
12
Y
1
7
11
10
4
REG+5V
R
19
2
+9V(M)
54
64
2
12
V
+5V(M)
REG+5V DET
(5.1V)
HOT
+5V(M)
30
C/Pb
56
+24V(INV)
AUDIO
9
7
TU001
AVR
OSC
7
15
9
TV_R
+B
9
SWITCHING TRANS
6
VOL
RL1
+5V(M)
10
16
IC1011
SWITCHING
5
3
1
7
6
2
R
L
DC OUT
53
Q3009,Q3010
INV
L:output mode
H:input mode
8
5
A
6
C
4
2
8
D
E
1
B
3
7
5
6
4
2
3
1
11
10
8
9
7
TC-20LA5/LE5 Block Diagram
TC-20LA5/LE5 Block Diagram
TC-20LA5 / TC-20LE5
15
G
R
+
+
SCL0
SCL2
MAIN_SW
OSD_VD
SCL0
L
OSD_G
LCD_MUTE
OSD_YM
RST
R
OSD_B
OSD_B
OSD_HD
LED_G
SD
A2
REMOTE
BASS
MUTE
OSD_G
SCL3
VO
L
OSD_HD
SDA2
SRQ
SD
A1
SDA0
OSD_CLK
RST
LED_R
SD
A2
TREBLE
SCL0
SOS
POWER_ON
LCD_MUTE
OSD_CLK
MAIN_SW
MAIN_SW
A
GC_DET
SDA3
OSD_R
SCL3
LED_G
REMO
TE
OSD_VD
SCL2
LED_R
INV-ON
5V(S)
VO
L
SCL1
MUTE
SD
A0
OSD_YS
INV_ON
OSD_R
OSD_YM
OSD_YS
SCL2
SRQ
KEY
SD
A3
SDA0
8
Q2007
V5
1
2
3
4
JK2101
1
2
3
4
5
6
7
9
Q4036
R2015
Q2010
R2012
R1301
Q1301
Q2006
7
11
D1302
RM001
VOUT
GND
VCC
X1001
6
Q1300
10
C2006
16V 100u
3
C2010
16V
100u
Q2009
1
Q2011
LVDS
BUFFER
PARALLE
+3.3V
DATA
TTL
CONV
IC1003
V/Y
+11V(S)
REMOTE
CLK
5V(S) DET
BASS
IC4012
1
1
64kbit
AMP
4
MAIN SW
52
L(-)
SYNC
STBY+5V
MOVE DET
43
S_CLOCK2
5
LCD MUTE
NR
HS/VS
AI
A12
LINE MEMORY
EEPR
OM_WP
TREBLE
OSD
STBY+3.3V
IC2001
3
I/F
S
D
ATA
2
LCD AI
AVR
54
HS/VS
SP_L+
LED(G)
1
V BOARD
Q2002
Q2005
14
1
+2.5V(M)
35
2D
RX2+
V1
S CLOCK1
C/Pb
RX3+
24
L_hp(+)
MATRIX
51
+2.5V(PLL)
19
SOS DET
R(-)
(10bit)
POWER ON
REMOTE CONTROL SENSOR
LCD PROCESSOR
2
26
OSD B
INVERTER
+11V(S)
SPEAKER(R)
IC906
P
A
NEL ON
DET
4
S DATA3
64M SDRAM
RX1-
47
RX3-
+9V(M)
GC RST
PROCESS
SCL
RX2-
DATA
LVDS DRIVER
PANEL CONTROLLER
R BOARD
RX2+
GLP
IC4018
1
BACK LIGHT
LED_G
POWER ON(G)
CLAMP
2
R/G/B
44
RX1+
SP(L-)
5
L(+)
TV ON
10
S
D
ATA
1
IC904
SP(R+)
9
16
5
PWRPWM
72
3
76
10
R(+)
77
A MUTE
SP(R-)
FIFO
C/Pb
1
IC4017
58
49
Q4035
CC_IN
58
18
INV ON
APWM
+5V(PANEL)
Q4019
Q4021
20
2
Q4014
Q4016
SYNC SEP
R_ch(+)
HEADPHONE
MUTE
13
OSD R
MUTE
I/F1
IC4009
DET
OSD YS
2.5V(AD)
5
5
A8
SKEW
PIXEL CONV
CORR
HS/VS
S CLOCK2
RX0+
L_ch(+)
INTERFACE
R/G/B
RX1-
AUDIO OUT
7
SRQ
RX0+
STANDBY(R)
+2.5V(M)
AVR
OSD
50
S
D
ATA
3
3.3V(M)
Y/C SEP
V-SCALE
DEMODU
SP_L-
CHROMA
EEPROM
+2.5V(AD)
HP(L+)
4
71
WP
7
RGB
4
RX2-
R(+)
VOL ADJ
H-SCALE
AVR
SDA
8
Y GAMMA
LEVEL SHIFT
S DATA0
13
STBY+3.3V/RESET
S CLOCK0
11
STBY+3.3V
OSD VD
S CLOCK0
4
2
POWER INDICATOR
+1.8V(M)
8
+3.3V(M)
A
G
C DET
4
2.5V(PLL)
27
4
80
A/D
Y/C SEP
10
GC3FM
REMO
T
E
MCU
RXCLK-
I/F
V-POS
17
4
Q1008
OSD CLK
I/F
OSD HD
HP MUTE(R)
KEY SCAN
RXCLK+
CLAMP
12
+3.3V(M)
+12V(INV)
LCD I/F
70
S_DATA2
SDRAM
57
64
LED_R
2
IC1001
6
LIGHT
I/F
STBY+3.3V
+5V(PANEL)
R_hp(+)
INV
2
8
R1
(10bit)
IC4014
HP MUTE(L)
6
DIGITAL
RESET
4
14
LUMINANCE
SDRAM
SPEAKER(L)
6
16
+3.3V(M)
SP_R+
18
CLK
RX0-
1.8V(M)
WIDE
ON/OFF
2
SELF
+12V(INV)
+5V(PANEL)
SP_R-
CORR
RX0-
SP(L+)
(8bit)
RESET
V/Y
3
CIRCUIT
RESET
OSC2
Q1005-Q1007
56
DIGITAL
I/F
6dB AMP
MUTE(R)
STB_3.3V
16
17
ADDRESS
L(+)
59
12
5
6
RXCLK+
AVR
+3.3V
3D
RX1+
YUV
LCD PANEL
18
S CLOCK3
IC4008
2
RXCLK-
12
INV ON
RX3+
8
8
Pr
OSD G
ID1/ED2
RX3-
2
BACK
4
IC1002
A11
IRQ
78
A BOARD
55
CIRCUIT
AVR
I/F2
OSD MIX
IC902
2
RESET
A5
S
D
ATA
0
(8bit)
FACTORY USED
Q4024
Q4025
2
75
CLK
OSD YM
+12V(INV)
1
1
HPK
PDIM
12
LED(R)
7
IC4003
RGB GAMMA
OSC1
DIGITAL CORE, 3D Y/C SEP
1
CIRCUIT
4
PWM
1
Q4027
MUTE(L)
S CLOCK3
S_CLOCK2
PNANEL
A V
O
L
66
23
Pr
S_D
A
T
A2
69
9
HP(R+)
1
13
14
9
8
12
15
11
10
7
10
8
9
1
11
4
2
3
5
6
TC-20LA5/LE5 Block Diagram
TC-20LA5/LE5 Block Diagram
TC-20LA5 / TC-20LE5
16
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