Panasonic TH-50PV70FA / TH-50PV70PA / TH-50PX70BA / TH-50PX70EA Simplified Service Manual ▷ View online
4.17. DG-Board (12 of 16) Schematic Diagram
+
+
+
+
RGB_CVBS
MAIN_RGB_CVBS_OUT
YPBPR_Y
YPBPR_PB
YPBPR_PR
AV1_GREEN
MAIN_RF_CVBS
AV2_V
AV2_SLOW
AV2_C
AV1_V
DVB_CVBS
RGB_FB
A
V2_RED/C
RGB_FB
AV1_SLOW
AV1_FB
AV2_FB
MAIN_RGB_CVBS_OUT
MAIN_Y_OUT
MAIN_PB_OUT
MAIN_PR_OUT
AG_VIDEO_STATUS
SCL0B_5V
SDA0B_5V
AV1_RED
AV1_BLUE
A
V2_GREEN
A
V
2_BLUE
MAIN_Y_OUT
MAIN_Y/CVBS
MAIN_PB/C
MAIN_PB_OUT
MAIN_PR
MAIN_PR_OUT
PC_B
PC_R
PC_G
PC_V_IN
PC_H_IN
PC_V
PC_H
P_AVSW9V
HV/FB_CONT
AV1_VO
AV2_VO
C3117
16V 1u
C3053
16V
1u
C3055
16V
1u
C3050
10V
2.2u
C3040
16V
0.1u
C3115
16V
0.1u
C3054
16V
1u
C3052
16V
1u
*C3066
16V
1u
C3047
10V
2.2u
C3024
16V
1u
C3049
10V
2.2u
C3116
16V
0.1u
C3021
16V
1u
C3051
16V
1u
C3025
16V
1u
C3056
16V
1u
C3043
16V
1u
1u
C3026
16V
0.1u
C3103
50V
10u
C3076
220u
16V
C3075
16V
220u
220u
C3118
16V
47u
D3044
B0BC01100001
AN15876A-VT
IC3001
1
V4
2
S12
3
Y4
4
S22
5
C4
6
VCC2
7
LP5
8
V3
9
O3
10
Y3
11
GND2
12
C3
13
LP4
14
V2
15
S11
16
Y2
17
S21
18
C2
19
LP3
20
V1
21
O2
22
Y1
23
O1
24
C1
25
VCC3
26
V
OUT6
27
DCOUT
28
V
OUT5FB
29
VOUT5
30
VOUT4FB
31
VOUT4
32
VOUT3FB
33
VOUT3
34
OUT2(Pr)
35
OUT2(Pb)
36
OUT2(CY)
37
GND3
38
OUT1(Pr)
39
OUT1(Pb)
40
OUT1(CY)
41
VOUT
42
HOUT
43
HVOE
44
VOUT7
45
VCC4
46
FBLOUT
47
FBL3
48
FBL2
49
FBL1
50
FBLOE
51
G1
52
VIN1
53
B1
54
HIN1
55
R1
56
GND4
57
G2
58
VIN2
59
B2
60
HIN2
61
R2
62
NC
63
G3
64
TEST
65
B3
66
NC
67
R3
68
NC
69
VCC1
70
NC
71
G4
72
LP1
73
B4
74
L31
75
R4
76
NC
77
G5
78
LP2
79
B5
80
L32
81
R5
82
GND1
83
SDA
84
SCL
85
FLAG
86
BIAS
87
V9
88
NC
89
V8
90
NC
91
V7
92
O4
93
V6
94
LP7
95
V5
96
S13
97
Y5
98
S23
99
C5
100
LP6
L3004
G1C101M00018
SUB9V_VIDEO
MOUT_9V
DTV9V
JS3032
R3092
68
R3100
220
*R3176
68
100
R3180
R3089
330
R3109
0
R3191
22
R3095
68
R3275
100k
R3123
47
R3090
22
*R3349
68
R3097
220
R3113
47k
R3112
47k
*R3174
68
R3121
47
R3098
220
*R3348
68
R3087
220
R3094
68
R3096
220
R3061
220
R3111
47k
1%
R3137
100
R3274
0
R3350
100
R3101
220
R3099
220
*R3305
100
100
R3179
R3273
0
R3059
220
R3060
220
*R3088
220
R3064
220
R3110
0
R3133
47k
*R3175
68
R3140
47
*R3302
100
Video SW
43
41
42
52
53
51
54
105
104
108
103
106
101
100
107
102
DG-BOARD (12/16)
TZTNP01PTTE (PA)
!
TXNDG1PSTD (EA)
AV-TERMINAL
CRNo.2000-3350
TXNDG1PSTE (FA)
TXNDG1PSTB (BA)
TH-50PV70FA/PA, TH-50PX70BA/EA
DG-Board (12 of 16) Shematic Diagram
DG-Board (12 of 16) Shematic Diagram
TH-50PV70FA/PA, TH-50PX70BA/EA
DG-Board (12 of 16) Schematic Diagram
DG-Board (12 of 16) Schematic Diagram
TH-50PV70FA / TH-50PV70PA / TH-50PX70BA / TH-50PX70EA
25
4.18. DG-Board (13 of 16) Schematic Diagram
+
+
+
+
+
+
+
+
+
+
+
+
+
AH_LRCK0
PWM_SQ_R-
SQ_L+
PWM_SQ_R+
AD_SCL2
SQ_R+
SQ_R-
PWM_SQ_L-
AD_SDA2
SQ_L-
PWM_SQ_L+
AH_SRCK0
AV_R
AH_HDMI_SDIN
AH_HDMI_BCLK
AH_HDMI_LRCK
AH_DAUDIO
AG_SOUND_SOS
AG_AUDIO_MUTE
D
A
C_PD
AV_L
AH_DMIX0
SCL0B_5V
SDA0B_5V
MAIN_RF_CVBS
AG_RF_AFT1
AH_IECOUT0
TV_L
AUDIOOUT_L
SPDIF_OUT
TV_R
SIF1
AUDIOOUT_R
DTV_SR
AM
DTV_SL
A
G
_A
UDIO_XRST
C2281
560p
50V
C2109
0.1u
16V
C2143
50V
180p
C2126
10u
10V
10u
10V
C2102
0.1u
16V
C2049
0.1u
16V
C2183
10u
10V
C3280
50V
100p
100p
C2268
100p
50V
C2213
1000p
50V
C2187
2.2u
6.3V
C2091
50V
10p
10p
C2110
0.1u
16V
C2114
0.1u
16V
C3279
25V
0.01u
C2171
0.01u
25V
*C2061
0.1u
16V
C3276
16V
0.1u
C2280
4.7u
16V
C2246
10u
10V
C2115
0.1u
16V
C2191
10u
10V
C2052
0.1u
16V
C2266
100p
50V
C2262
10u
10V
C2189
1u
16V
C2264
10u
10V
C2138
0.1u
16V
C2105
0.1u
16V
*C2065
0.1u
16V
C3281
16V
0.1u
C2134
25V
0.01u
C2055
12p
50V
*C2068
50V
1200p
C2057
0.1u
16V
C2053
0.1u
16V
C2185
10u
10V
C2117
0.1u
16V
C2186
0.1u
0.1u
16V
C2097
16V
0.1u
C2272
4.7u
16V
C2244
0.1u
16V
C2170
50V
33p
C2106
0.1u
16V
*C2062
10u
10V
C2100
0.1u
16V
C2118
1u
16V
C2054
10u
10V
C2124
0.1u
16V
C2130
10V
10u
C2058
0.1u
0.1u
16V
C2263
10u
10V
C2132
25V
0.01u
C2092
50V
22p
22p
*C2069
50V
1200p
C2146
50V
180p
C2089
560p
50V
C3272
50V
0.1u
0.1u
C2173
4.7u
16V
C2048
0.1u
16V
C2216
0.1u
16V
*C2063
10u
6.3V
C2088
4.7u
16V
C2096
16V
0.1u
C2101
10u
10V
*C2056
8p
50V
C2023
0.1u
16V
C2190
10u
10V
C2188
470p
50V
*C2064
10u
6.3V
C2153
50V 33p
C3275
16V
0.1u
16V
0.1u
C2116
470p
50V
C2251
10u
10V
C2267
100p
50V
C2261
10u
10V
C2050
0.1u
16V
C2245
1000p
50V
C2265
100p
50V
C2120
56p
50V
C2121
56p
50V
C2131
16V
0.1u
*C2274
0.1u
16V
C2111
2.2u
6.3V
C2192
47u
6.3V
C2133
50V
4.7u
C2113
47u
6.3V
6.3V
C2108
47u
6.3V
C3081
6.3V
100u
C2059
47u
6.3V
47u
6.3V
*C2060
16V
47u
C3273
10u
50V
C2107
47u
6.3V
C2112
47u
6.3V
C2137
47u
6.3V
C3270
6.3V
1000u
C2151
47u
6.3V
C0JBAZ002261
*IC2006
1
G
2
IN A
3
GND
5
VCC
4
OUT Y
C0CBCBC00190
IC2010
1
VDD
2
GND
3
CE
5
VO
U
T
4
NC
IC2011
C0ABBB000230
1
2
3
4
5
6
7
8
C0FBBY000027
*IC2002
1
MCLK
2
BICK
3
SDTI
4
LRCK
5
RSTN
6
SMUTE
7
ACKS
8
DIF0
9
DIF1
10
AOUTR
11
AOUTL
12
VCOM
13
VSS
14
VDD
15
DEM
16
DZF
C0DBFFD00003
IC2107
1
2
3
4
5
6
7
C0CBCBE00001
IC2008
1
VOUT
2
NC
3
GND
4
CNCONT
5
SUB
6
VIN
7
C1AB00002746
IC2106
1
FIL
T
A
2
VREF
3
A
GND
4
AVDD
5
SIF_REEP
6
SIF_REFCM
7
SIF_REFN
8
SIF_IN1
9
SIF_PGA_REF
10
SIF_IN2
11
AGND
12
AVDD
13
DGND
14
DVDD
15
MUTE
16
SDA
17
SCL
18
LRCLK2
19
BCLK2
20
DGND
21
DVDD
22
SDIN0
23
SDIN1
24
SDIN2
25
SDIN3
26
LRCLK0
27
BCLK0
28
ODGND
29
OD
VDD
30
VDRIVE
31
D
VDD
32
DGND
33
MCLKI/XIN
34
XOUT
35
BCLK1
36
LRCLK1
37
SDO0
38
SPDIF_OUT
39
SPDIF_IN
40
DVDD
41
DGND
42
PWM1A
43
PWM1B
44
PWM2A
45
PWM2B
46
PWM3A
47
PWM3B
48
PWM4A
49
PWM4B
50
RESET
51
DVDD
52
DGND
53
AVDD
54
PLL_LF
55
AGND
56
AGND
57
HPOUTL1
58
HPOUTR1
59
AV
D
D
60
NC
61
NC
62
NC
63
NC
64
NC
65
NC
66
V
OUT_SW
67
FIL
T
D
68
A
VDD
69
A
GND
70
A
GND
71
A
VDD
72
A
UXOUTL1
73
A
UXOUTR1
74
A
UXOUTL2
75
A
UXOUTR2
76
AINL2
77
AINR2
78
AINL1
79
AINR1
80
ISET
L2040
J0JHC0000045
L3210
J0JCC0000241
L2027
J0JHC0000045
L3209
J0JGC0000021
L3207
J0JCC0000241
L3206
J0JCC0000241
L2021
J0JHC0000078
*L2022
J0JHC0000078
L2029
J0JCC0000077
L3211
J0JGC0000021
L2026
G1C6R8MA0061
SUB3.3V
SUB3.3V
SUB5V
BT30V
DVDD1.8V
DVDD3.3V
DTV9V
DVDD3.3V
SUB5V
DTV9V
DVDD1.8V
SUB5V
SUB5V
AUD3.3V
TP3200
Q2016
2SC584500L
Q2102
2SC584500L
Q2101
2SC584500L
Q2017
2SC584500L
Q2021
2SA207700L
Q2015
2SA207700L
Q3200
2SA207700L
R2271
22
22
EXB28V220JX
JS3208
0
R2179
10k
1%
R2198
158k
10k
R2276
1%
R2168
16k
*R2233
10k
1%
R2197
68k
R3239
220
R2084
4.7k
4.7k
10k
R2110
20k
1%
R2145
1%
R2183
36k
33
*R2234
1%
R2166
16k
R2210
10k
10k
R2092
470
R2088
100
100
*R2072
2.2k
R2125
20k
1%
R2146
R2097
3.3k
R2266
560
R2178
1k
1k
33
*R2253
0
R2257
*R2066
1.2k
1k
*R2244
1%
R2113
120k
1%
R2181
22k
33
*R2254
20k
1%
R2150
22
R2056
R3246
22
100
R2111
1M
R2059
1%
R2114
75k
R2209
10k
10k
R2046 0
ERJ3GEY0R00V
R2296
0
20k
1%
R2151
R2165
10k
R2089
560
R2238
47k
R2094
2.2k
R3247
220
R3240
560
1%
1%
R2182
36k
1%
R2169
22k
2k
1%
R2104
0
*R2250
300
R2058
R3244
22
R2096
10k
R3243
270
270
22
R2057
*R2067
1.2k
R2149
10k
R2086
470
R2180
1k
*R2252
33
R2297
0
20k
1%
R2100
R2265
4.7k
4.7k
R2093
3.3k
R2085
560
1M
R2112
33
*R2073
*R2074
12k
*R2075
12k
TU3200
ENGF7701GF
BB
5
NC
6
NC
7
NC
8
+B
9
AUDIO_OUT
10
SIF_OUT
11
NC
12
SCL
13
SDA
14
RF_AGC
15
VB
16
NC
17
BTL
18
NC
19
AFT_OUT
20
VIDEO_OUT
21
H0J245500082
X2010
GND
AUDIO DSP
-
R
L
+
-
+
>> Monitor R
Audio
DAC
DAC
VCC
>> Monitor L
52
51
54
53
61
64
65
63
62
DVDD1.8V
BUFFER
3.3V
AUD3.3V
AMP
113
114
117
109
112
116
111
110
115
!
TXNDG1PSTD (EA)
AV-TERMINAL
CRNo.2000-3350
TXNDG1PSTE (FA)
TXNDG1PSTB (BA)
DG-BOARD (13/16)
TZTNP01PTTE (PA)
TH-50PV70FA/PA, TH-50PX70BA/EA
DG-Board (13 of 16) Shematic Diagram
DG-Board (13 of 16) Shematic Diagram
TH-50PV70FA/PA, TH-50PX70BA/EA
DG-Board (13 of 16) Schematic Diagram
DG-Board (13 of 16) Schematic Diagram
!
TH-50PV70FA / TH-50PV70PA / TH-50PX70BA / TH-50PX70EA
26
4.19. DG-Board (14 of 16) Schematic Diagram
+
+
+
+
PWM_SQ_R+
PWM_SQ_R-
PWM_SQ_L+
AMUTE
PWM_SQ_L-
AG_SOUND_SOS
AG_A_MON_MUTE/SP_MUTE
HDMI_INT2
MONITOROUT_MUTE
A
G
_A
UDIO_MUTE
STB_RST
AMUTE
C2319
0.033u
25V
C2307
25V
1u
25V
1u
C2341
50V
0.1u
C2345
50V
0.022u
50V
0.022u
C2337
50V
0.022u
50V
0.022u
C2317
0.033u
25V
C2329
16V
0.1u
C2325
50V
0.47u
C2375
50V
50V
0.022u
C2363
16V
0.1u
C2327
16V
0.1u
C2379
50V
0.022u
50V
0.022u
C2303
25V
1u
25V
1u
C2353
50V
0.1u
C2347
50V
0.022u
50V
0.022u
C2389
50V
1000p
C2343
50V
50V
0.1u
C2302
16V
0.1u
C2335
50V
50V
0.1u
C2313
50V
50V
0.1u
C2359
50V
0.1u
C2387
50V
1000p
50V
1000p
C2333
50V
0.1u
C2385
50V
1000p
C2301
16V
0.1u
C2383
50V
1000p
50V
1000p
C2331
50V
0.47u
C2349
50V
0.1u
C2381
50V
0.022u
50V
0.022u
C2315
16V
0.1u
C2311
16V
0.1u
C2305
25V
1u
25V
1u
C2323
0.033u
25V
C2355
50V
0.1u
0.1u
C2309
25V
1u
25V
1u
C2321
0.033u
25V
C2339
50V
0.022u
50V
0.022u
C2357
50V
0.1u
C2352
16V
1u
C2377
50V
0.022u
C2361
25V
470u
C2119
16V
220u
C2354
220u
16V
C2819
25V
47u
D2028
MA2J11100L
D2034
MA2J11100L
D2304
MA2J11100L
MA2J11100L
D2031
MA2J11100L
D2033
MA2J11100L
D2026
MA2J11100L
D2032
MA2J11100L
D2301
MA2J11100L
D2029
MA2J11100L
MA2J11100L
D2302
MA2J11100L
D2303
MAZ30560HL
C1AB00002730
IC2301
1
GVDD_B
44
GVDD_A
2
OTW
3
NC
4
NC
5
SD
6
PWM_A
7
RESET_AB
8
PWM_B
9
OC_ACJ
10
GND
11
AGND
12
VREG
13
M3
14
M2
15
M1
16
PWM_C
17
RESET_CD
18
PWM_D
19
NC
20
NC
21
VDD
22
GVDD_C
23
GVDD_D
24
BST_D
25
NC
26
PVDD_D
27
PVDD_D
28
OUT_D
29
GND_D
30
GND_C
31
OUT_C
32
PVDD_C
33
BST_C
34
BST_B
35
PVDD_B
36
OUT_B
37
GND_B
38
GND_A
39
OUT_A
40
PVDD_A
41
PVDD_A
42
NC
43
BST_A
C0DBGYY00202
IC2303
VIN
3
2
VSS
VOUT
1
DG12
1
2
3
4
L2310
J0JJC0000011
L2308
J0JJC0000011
L2304
G1C330MA0291
L2306
G1C330MA0291
L2302
G1C330MA0291
L2650
G1C3R3ZA0083
L2300
G1C330MA0291
S_15V
SOUND15V
DTV9V
SOUND12V
STB5V
STB5V
MAIN9V
SOUND15V
MAIN9V
TP2301
TP2310
TP2302
TP2305
TP2307
TP2303
Q2042
2SC584500L
Q2039
2SC584500L
Q2034
2SC584500L
Q2035
2SC584500L
Q2040
2SC584500L
Q2041
2SC584500L
Q2301
2SA207700L
Q2033
2SA207700L
Q2031
2SA207700L
R2123
47k
R2124
10k
R2325
10
R2308
3.3
R2143
10k
R2317
10
R2127
10k
R2144
10k
R2156
330
R2208
10k
R2122
10k
R2315
3.3
R2194
1k
R2217
47k
R2131
10k
R2330
1k
1k
R2206
10k
R2323
10
R2302
2.2k
R2128
47k
R2301
2.2k
R2306
68k
R2216
10k
R2311
3.3
R2305
470
R2205
20k
R2220
12k
R2319
10
R2129
10k
10k
R2321
10
R2313
3.3
R2331
2.2k
R2119
10k
R2218
1k
R2118
1M
MUTE
MUTE SW
To SOS
15V
OPERATE
RESET
SOS
OPERATE
R-
L+
L-
OPERATE
MUTE
R+
MUTE
MUTE
MUTE
MUTE
65
63
64
62
61
73
74
72
71
SP AMP
123
122
126
121
124
119
118
125
120
TO SPEAKER
AV-TERMINAL
CRNo.2000-3350
!
TXNDG1PSTD (EA)
DG-BOARD (14/16)
TZTNP01PTTE (PA)
TXNDG1PSTE (FA)
TXNDG1PSTB (BA)
TH-50PV70FA/PA, TH-50PX70BA/EA
DG-Board (14 of 16) Shematic Diagram
DG-Board (14 of 16) Shematic Diagram
TH-50PV70FA/PA, TH-50PX70BA/EA
DG-Board (14 of 16) Schematic Diagram
DG-Board (14 of 16) Schematic Diagram
TH-50PV70FA / TH-50PV70PA / TH-50PX70BA / TH-50PX70EA
27
4.20. DG-Board (15 of 16) Schematic Diagram
+
QLINK_AV3
QLINK_AV2
HDMI_INT2
MAIN_PR
MAIN_PB/C
MAIN_Y/CVBS
RGB_CVBS
RGB_FB
DVB_CVBS
AD_SDA2
AG_AUDIO_MUTE
AG_AUDIO_XRST
AG_A_MON_MUTE/SP_MUTE
AG_SOUND_SOS
AG_RF_AFT1
AG_SOS
STB_RST
AG_KEY1(CON-PANE)
AD_SCL2
AD_SCL2
AD_SDA2
AG_SOS
AG_TV_SUB_ON_DELAY
AG_TV_SUB_ON_DELAY
PC_V
PC_H
AG_VIDEO_STATUS
AH_IECOUT0
AH_SRCK0
AH_DMIX0
AH_LRCK0
AH_DAUDIO
AH_HDMI_BCLK
AH_HDMI_SDIN
AH_HDMI_LRCK
AG_TV_MAIN_ON
SCL0B_5V
SDA0B_5V
C2801
16V
10u
C2815
16V
0.1u
C2814
4700p
50V
C2803
0.47u
50V
C2817
50V
1000p
C2802
0.47u
50V
C2813
16V
0.1u
C2816
35V
22u
D2635
MA2J11100L
D2632
MA2J11100L
D2633
MA2J11100L
D2637
MA2J11100L
MA2J11100L
D2634
MA3X78900L
D2638
B0BC03900015
D2636
MAZ30470HL
C0DBAJB00004
IC2610
1
V
OUT
2
VDD
3
NC
5
EXT
4
VSS
L2648
G1C470MA0077
L2649
G1C100MA0072
SUB3.3V
SUB5V
SUB3.3V
STB5V
DTV9V
BT30V
TP2013
TP2606
TP2004
TP2014
TP2000
TP2002
TP2012
TP2005
TP2024
TP2020
TP2608
TP2612
TP2015
TP2006
TP2018
TP2008
TP2021
TP2003
TP2009
TP2007
TP2019
TP2022
TP2607
TP2609
TP2023
TP2001
TP2611
TP2610
TP2017
AG_SOUND_SOS
AG_RF_AFT1
RGB_FB
AG_KEY1(CON-PANE)
AD_SDA2
PC_H
AH_SRCK0
AG_A_MON_MUTE/SP_MUTE
RGB_CVBS
AH_LRCK0
AG_QLINK1
AG_RF_AFT2
AH_DMIX0
AG_TV_MAIN_ON
AG_AUDIO_MUTE
AG_SOS
MAIN_PR
AG_AUDIO_XRST
AH_HDMI_SDIN
AG_TV_SUB_ON_DELAY
AD_SCL2
AH_HDMI_LRCK
MAIN_PB/C
AG_VIDEO_STATUS
STB_RST
HDMI_INT2
DVB_CVBS
MAIN_Y/CVBS
AH_HDMI_BCLK
PC_V
AG_QLINK2
AH_IECOUT0
AH_DAUDIO
Q2640
B1CBHD000002
Q2641
B1CBHD000002
Q2639
B1CFNG000001
Q2635
2SC584500L
Q2638
2SC584500L
Q2636
2SA207700L
Q2637
2SA207700L
JS2051
JS2047
JS2046
JS2053
R2863
1k
R2890
100k
R2869
4.7k
1%
R2867
82k
R2854
2.2k
R2864
1k
R3213
0
R2624
22
R2858
2.2k
R2629
6.8k
R2865
10k
R2860
10k
R2855
47k
R2866
2.2k
R2625
22
R2628
6.8k
1%
R2868
16k
R2853
10k
R2859
4.7k
R3214
0
R2647
0
R2861
1k
R2857
4.7k
R3312
47k
74
72
73
71
BT30V
131
132
135
127
130
134
129
128
133
TXNDG1PSTD (EA)
TXNDG1PSTE (FA)
TXNDG1PSTE (FA)
DG-BOARD (15/16)
TXNDG1PSTB (BA)
TXNDG1PSTB (BA)
TZTNP01PTTE (PA)
AV-TERMINAL
CRNo.2000-3350
!
to(9/16)
to(5/16)
to(5,10/16)
to(7/16)
to(5,6,7/16)
to(7/16)
to(7,16/16)
to(7/16)
to(6,7,16/16)
to(6,7/16)
to(5/16)
to(9/16)
to(7/16)
TH-50PV70FA/PA, TH-50PX70BA/EA
DG-Board (15 of 16) Shematic Diagram
DG-Board (15 of 16) Shematic Diagram
TH-50PV70FA/PA, TH-50PX70BA/EA
DG-Board (15 of 16) Schematic Diagram
DG-Board (15 of 16) Schematic Diagram
TH-50PV70FA / TH-50PV70PA / TH-50PX70BA / TH-50PX70EA
28
Click on the first or last page to see other TH-50PV70FA / TH-50PV70PA / TH-50PX70BA / TH-50PX70EA service manuals if exist.