JVC LT-20E50SU Service Manual
SCHEMATIC DIAGRAMS
WIDE LCD PANEL TELEVISION
YA23520053
LT-20E50SU,
LT-20E50SU
LT-20E50SJ
CD-ROM No.SML200503
VCR DVDTV
MENU
BACK
P
PC
TV
/Z,
COPYRIGHT © 2005 Victor Company of Japan, Limited
No.YA235
2005/3
LT-20E50SU, LT-20E50SU/Z, LT-20E50SJ
STANDARD CIRCUIT DIAGRAM
NOTE ON USING CIRCUIT DIAGRAMS
1.SAFETY
The components identified by the symbol and shading are
critical for safety. For continued safety replace safety ciritical
components only with manufactures recommended parts.
2.SPECIFIED VOLTAGE AND WAVEFORM VALUES
The voltage and waveform values have been measured under the
following conditions.
(1)Input signal : Colour bar signal
(2)Setting positions of
each knob/button and
variable resistor
(3)Internal resistance of tester
(4)Oscilloscope sweeping time
(5)Voltage values
Since the voltage values of signal circuit vary to some extent
according to adjustments, use them as reference values.
: Original setting position
when shipped
: DC 20kΩ/V
: H
: V
: Othters
: All DC voltage values
20µs / div
5ms / div
Sweeping time is
specified
3.INDICATION OF PARTS SYMBOL [EXAMPLE]
In the PW board
: R209
R209
Type
No indication
MM
PP
MPP
MF
TF
BP
TAN
(3)Coils
No unit
Others
(4)Power Supply
Respective voltage values are indicated
(5)Test point
: Test point
(6)Connecting method
: Ceramic capacitor
: Metalized mylar capacitor
: Polypropylene capacitor
: Metalized polypropylene capacitor
: Metalized film capacitor
: Thin film capacitor
: Bipolar electrolytic capacitor
: Tantalum capacitor
: [µH]
: As specified
: B1
: 9V
: Connector
: Receptacle
: Only test point display
: Wrapping or soldering
: B2 (12V
: 5V
)
4.INDICATIONS ON THE CIRCUIT DIAGRAM
(1)Resistors
Resistance value
No unit : [Ω]
K
M
Rated allowable power
No indication : 1/16 [W]
Others : As specified
Type
No indication
OMR
MFR
MPR
UNFR
FR
Composition resistor 1/2 [W] is specified as 1/2S or Comp.
(2)Capacitors
Capacitance value
1 or higher : [pF]
less than 1
Withstand voltage
No indication : DC50[V]
Others : DC withstand voltage [V]
AC indicated
Electrolytic Capacitors
47/50[Example]: Capacitance value [µF]/withstand voltage[V]
: [kΩ]
: [MΩ]
: Carbon resistor
: Oxide metal film resistor
: Metal film resistor
: Metal plate resistor
: Uninflammable resistor
: Fusible resistor
: [µF]
: AC withstand voltage [V]
(7)Ground symbol
: LIVE side ground
: ISOLATED(NEUTRAL) side ground
: EARTH ground
: DIGITAL ground
5.NOTE FOR REPAIRING SERVICE
This model's power circuit is partly different in the GND. The
difference of the GND is shown by the LIVE : ( ) side GND and the
ISOLATED(NEUTRAL) : ( ) side GND. Therefore, care must be
taken for the following points.
(1)Do not touch the LIVE side GND or the LIVE side GND and the
ISOLATED(NEUTRAL) side GND simultaneously. if the above
caution is not respected, an electric shock may be caused.
Therefore, make sure that the power cord is surely removed from
the receptacle when, for example, the chassis is pulled out.
(2)Do not short between the LIVE side GND and ISOLATED(NEUTRAL
side GND or never measure with a measuring apparatus measure
with a measuring apparatus ( oscilloscope, etc.) the LIVE side GND
and ISOLATED(NEUTRAL) side GND at the same time.
If the above precaution is not respected, a fuse or any parts will be broken.
Since the circuit diagram is a standard one, the circuit and
circuit constants may be subject to change for improvement
without any notice.
NOTE
Due improvement in performance, some part numbers show
in the circuit diagram may not agree with those indicated in
the part list.
When ordering parts, please use the numbers that appear
in the Parts List.
)
(No.YA235)2-1
CONTENTS
SEMICONDUCTOR SHAPES ......................................................................2-2
BLOCK DIAGRAM ........................................................................................ 2-3
CIRCUIT DIAGRAMS
MAIN PWB CIRCUIT DIAGRAM ................................................................................................................ 2-5
FAV PWB CIRCUIT DIAGRAM ................................................................................................................. 2-19
SIDE CONTROL PWB CIRCUIT DIAGRAM ............................................................................................. 2-20
LED PWB CIRCUIT DIAGRAM ................................................................................................................. 2-20
PATTERN DIAGRAMS
MAIN PWB PATTERN .............................................................................................................................. 2-21
FAV PWB PATTERN ................................................................................................................................. 2-23
CONTROL BUTTON PWB PATTERN ....................................................................................................... 2-23
LED PWB PATTERN ................................................................................................................................ 2-23
USING P.W. BOARD
P.W.B ASS’Y name
MAIN P.W. BOARD
SIDE CONTROL PWB
LED PWB
AV & HEADPHONE PWB
P.W.B ASS’Y number
VE-20177794
VE-20180094
VE-20180117
VE-20180067
SEMICONDUCTOR SHAPES
TRANSISTOR
BOTTOM VIEW FRONT VIEW TOP VIEW
CHIP TR
E
C
B
ECB
IC
BOTTOM VIEW FRONT VIEW TOP VIEW
OUT
E
IN
IN OUTE
B
(G)E(S)C(D)
1 N
ECB
ECB
1
1 N
C
BE
N
CHIP IC
2-2(No.YA235)
TOP VIEW
1
N
1
N
BLOCK DIAGRAM
2-4(No.YA235)(No.YA235)2-3
CIRCUIT DIAGRAMS
MAIN PWB CIRCUIT DIAGRAM (1/8)
PL101
+3.3V
S+3.3V
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
86VSS4
IC104
1 VDD1
VCC3_M
HDTV_CS
HDTV_Y
SW_G
BA_0
BA_1
MA10 10k
MA0
MA1
MA2
MA9
MA8
MA7
MA6
MA5
MA4
MA3
DQM
D112
BAV99
S117
S119
SDA_PC
5V_DDC
VCC3
100n
C114
MD12
MD13
MD14
MD15MD0
85DQ15
84VSSQ8
80DQ12
81VDDQ8
82DQ13
83DQ14
VCC3
16V
MD11
78VSSQ7
79DQ11
50V
10n
C113
MD8
MD9
MD10
75VDDQ7
76DQ9
74DQ8
73NC 7
77DQ10
NKL
MA9
VCC3_M
DQM
72VSS3
70NC 6
71
MA8
66A9
68CL K
69NC 5
67CK E
65A8
MA3
MA4
MA5
MA6
MA7
60A3
63A6
62A5
64A7
61A4
VCC3
DQM
59DQM 3
58VSS2
100n
C112
MD30
MD31
55VDDQ6
56DQ31
54DQ30
57NC 4
DQM1
MT48LC2M32B2
3 VDDQ1
5DQ2
7DQ3
2DQ0
4DQ1
MD1
10n
C108
16V
100n
C104
VCC3_M
V_AD
S125
S126
V_AD
C136
100n
SDA_3.3V16V
SCL_3.3V
V_DD
SW_R
C226
1n
50V
C217
1n
C119
50V
1n
50V
V_AD
SW_B
R169
10k
R168
10k
R170
R171
10k
R172
10k
R173
10k
R174
10k
R175
10k
R176
10k
R177
10k
R178
10k
R179
10k
R180
10k
R181
10k
R182
10k
D111
BAV99
BAV99
SCL_PC
75R
R103
75R
R104
C100
22p
50V
75R
R100
S118
75R
R101
75R
R102
9 VDDQ2
6 VSSQ1
8DQ4
11 DQ6
13 DQ7
15 VDD2
17 WE
19 RAS
21 NC2
23 BA 1
25 A0
27 A2
29 VDD3
31 DQ16
10 DQ5
12 VSSQ2
14 NC1
16 DQM 0
18 CAS
20 CS
22 BA0
24 A10
26 A1
MD2
MD3
MD4
MD5
MD7
MD6
50V
10k
R140
V_AD
C128
100n
16V
V_AD
+3.3V
+3.3V
+3.3V
5VSTBY
D110
D107
BAV99
C117
47n
50V
BLM21A601S
C130
100n
16V
C116
47n
50V
C129
100n
C118
C127
100n
16V
BAV99
10k
R106
10k
R105
C105
C115
VCC3_M
L101
C138
60 GND16
59 VD9
58 REFBYPASS
R122
100R
57 SDA
R123
100R
56 SCL
55 AO
54 RAIN
S107
53 GND15
52 VD8
51 VD7
16V
50 GND14
49 SOGIN
48 GAIN
47 GND13
46 VD6
45 VD5
44 GND12
43 BAIN
47n
50V
42 VD4
41 GND11
K
D113
D114
A
VSYNC_PCIN
C101
22p
50V
HSYNC_PCIN
VGA_B
VGA_G
D103
BAV99
VGA_R
5VSTBY
2
1
D105
BAV99
100n
22u
22u
16V
50V
50V
BZT55C5V1
50V
10n
C109
VCC3_M
16V
100n
C124
61GND17
62VD10
63GND18
38 CLAMP
39 VD3
40 GND10
C126
1k
R183
100n
16V
V_AD
16V
HDTV_CS
C224
VGA_G
100n
16V
C222
HDTV_Y
100n
16V
HDTV_VS
VGA_SW
+5V
VGA_R
HDTV_CR
S140
SW_R
VGA_G
HDTV_Y
75R
R190
S141
SW_G
CS0#
WE#
CAS#
RAS#
DQM
CLK_PCOUT
C122
SOG_PCOUT
HS_PCOUT
VS_PCOUT
100n
L113
16V
BLM21A601S
65SOGOUT
66HSOUT
67DATACK
68GND19
64VSOUT
33 FILT
34 PVD1
35 PVD2
36 GND9
37 MIDSCV
C132
C134
33n
50V
1n
50V
C133
3n9
100n
C137
50V
C131
100n
16V
C185
100u
16V
IC108
1 CSYNC
2 CVBS_IN
EL1883IS
3 VSYNC
4 GND 5BBPO
R189
1k
1A
2B
3C
S128
4D
PI5V330_SOIC
5E
6F
S129
7G 10J
8H
75R
R191
VGA-HDTV SW
2
VOUT
BA_0
V_D D
69VDD4
IC105
32 GND8
3k3
R121
IC106
LM1117
OUT
4
IC107
BA_1
PC_R 7
PC_R 6
70RED7
71RED6
AD9883
30 HSYNC
31 VSYNC
HD_PC_VS
IN
3
GN D
1
C183
100n
8VDD
7HSYNC
6RSET
16V
28 DQM 2
MA0
MA1
MA2
DQM
MA10
PC_R 5
PC_R 1
PC_R4
PC_R2
PC_R3
72RED5
73RED4
74RED3
75RED2
76RED1
25 GND6
26 VD1
27 VD2
28 GND7
29 COAST
1k
R184
C125
100n
16V
V_AD
S112
S111
S121
S122
L112
BLM21A601R
16V
100n
C220
HDTV_HS
C221
10n
50V
HD_FLAG
+5V_PANEL
BLM21A601S
16R
100n
C190
15O
14N
13M
12L
VGA_B
11K
HDTV_CB
9I
33 DQ17
30 NC3
32 VSSQ3
MD16
MD17
10n
C110
16V
100n
C106
VCC3_M
PC_R 0
16V
100n
C123
77RED0
78VDD5
79VDD6
80GND20
21 GND4
22 VDD2
23 VDD3
24 GND5
C121
100n
16V
V_D D
6015_HSOUT
HD_PC_HS
+5V
5VSTBY
+5V
R193
C191
SW_G
10u
16V
+5V
L111
16V
R194
AVDD_3.3
+12V
S104
S103
+3.3V
S102
VIN
S143
+5V
5VSTBY
SDA_PC 100R
5VSTBY
SCL_PC
S130
SW_B
S142
75R
R192
VCC3
16V
MD29MD18
52VSSQ6
53DQ29
35 VDDQ3
34 DQ18
50V
VCC3_M
V_DD
10k
15k
R195
100k
6
5
4k7
R109
R110
4k7
10GND2
11VDD1
12BLUE7
13BLUE6
14BLUE5
15BLUE4
16BLUE3
17BLUE2
18BLUE1
19BLUE0
20GND3
R196
R127
10k
MD28
MD19
1GND1
2GREEN7
3GREEN6
4GREEN5
5GREEN4
6GREEN3
7GREEN2
8GREEN1
9GREEN0
BC848B
51DQ28
36 DQ19
Q102
75R
Q101
FDC642P
C225
D109
10n
50V
C111
MD27
50DQ27
37 DQ20
MD20
C120
100n
16V
C192
100n
BZT55C5V1
49VDDQ5
38 VSSQ4
PC_G7
PC_G6
PC_G5
PC_G4
PC_G3
PC_G2
PC_G1
PC_G0
PC_B7
PC_B6
PC_B5
PC_B4
PC_B3
PC_B2
PC_B1
PC_B0
AVDD_3.3
SOG_PCOUT
6015_HSOUT
50V
470p
1
2
34
16V
16V
VSYNC_PCIN
5VSTBY
MD26
48DQ26
39 DQ21
MD21
100n
C107
C139
22u
50V
V_DD
AVDD_3.3
10u
5V_DD C
MD24
MD25
46
45DQ24
47DQ25
44VSS1
MD3
MD0
MD1
10k
155AODD
2 SCL
100R
INTENSITY
C147
100n
16V
R148
100R
100R
R147
CLK_PCOUT
154ACLK
3 SCS
R146
SDA_3.3V
C189
100n
16V
RESET_GM6015
153RAMDQ0
4 SDATA
100R
8 SCL 9VDD_2
MD2
151RAMDQ2
152RAMDQ1
6IRQ
5 RESET
IRQ
RESET_GM6015
OVVS
1k
R151
16V
100n
R153
10VSYNC
7 SDA
150VSS_20
7 BCLK
10k
S133
C188
+3.3V
S109
149RAMDQ3
8 BODD
C186
47p
50V
VCLK_MAIN
S134
11VDD1
6 RESET
S132
VSSQ5
VS_PCOUT
VDDQ4
41
43 VDD4
40 DQ22
42 DQ23
MD22
MD23
VCC3_M
S123
VCC3_M
L109
HS_PCOUT
6015_HSOUT
CVDD_2.5
R157
47R
18
2
3
4
R159
47R
18
2
3
4
CVDD_2.5
R161
47R
18
2
3
4
14.31818MHz
R162
100k
L104
BLM21A601S
157 AHS_CS
158 ARAWHS_CS
R141
159 ACREF
160 AHREF_DE
161 VSS_21
C176
100n
16V
162 VDD_9
163 ADATA23
164 ADATA22
165 ADATA21
166 VSS_22
C166
220p
50V
167 CVDD_8
168 ADATA20
R1
169 ADATA19
7
R2
170 ADATA18
6
R3
171 ADATA17
5
R4
172 ADATA16
173 ADATA15
174 ADATA14
175 ADATA13
176 ADATA12
R1
177 ADATA11
7
R2
178 ADATA10
6
R3
179 ADATA9
5
R4
180 ADATA8
181 ADATA7
182 ADATA6
183 ADATA5
184 VSS_23
C167
100n
16V
185 CVDD_9
186 ADATA4
R1
187 ADATA3
7
R2
188 ADATA2
6
R3
189 ADATA1
5
R4
190 ADATA0
191 VSS_DDS
C150
100n
16V
192 VDD_DDS
193 AVSS_DDS
C153
220p
50V
194 AVDD_DDS
195 VSS_MPLL
C151
100n
16V
196 VDD_MPLL
197 AVSS_MPLL
C154
220p
50V
198 AVDD_MPLL
199 AVSS_RPLL
C152
100n
16V
200 AVDD_RPLL
201 XTAL
X100
202 TCLK
203 AVSS_CSS
204 BSOY_G+
205 BSOY_G-
C146
206 ASOY_G-
63V470n
207 ASOY_G+
208 AVDD_CSS
C155
220p
50V
BLM21A601S
+5V 10k
+3.3V
+3.3V
R156
47R
18
R1
PC_B7
2
7
R2
PC_B6
3
6
R3
PC_B5
4
5
R4
PC_B4
PC_B3
PC_B2
PC_B1
PC_B0
R158
47R
18
R1
PC_G 7
2
7
R2
PC_G 6
3
6
R3
PC_G 5
4
5
R4
PC_G 4
PC_G 3
PC_G 2
PC_G 1
PC_G 0
R160
47R
8
1
R1
PC_R7
2
7
R2
PC_R6
3
6
R3
PC_R5
4
5
R4
PC_R4
PC_R3
PC_R2
PC_R1
PC_R0
S+3.3V
AVDD_3.3
L105
BLM21A601S
AVDD_3.3
AVDD_3.3
C148
AVDD_3.3
4p7
50V
C149
4p7
50V
AVDD_3.3
S114
S115
AVDD_3.3
S131
16V
L110
BLM21A601S
S124
+3.3V
+3.3V
R198
156AVS
1 VSS_1
PANEL_VCC
R197
330R
R128
10k
BC848B
Q100
C219
BZT55C5V1
D108
R107
R108
100R
R111
100R
D100
1N4148
D101
1N4148
C102
100n
16V
5SDA
7 VCLK
8 VCC
PANEL_CONT
ST24LC21
IC102
CVDD_2.5
+3.3V
+5V
R145
SCL_3.3V
S137
S136
S135
C177
22u
50V
4VSS
3NC36SCL
2NC2
1NC1
SCL_5V
SDA_5V
MD4
148RAMDQ4
9BVS
CVDD_2.5
C165
100n
16V
147CVDD_7
146VSS_19
MD 5
145RAMDQ5
MD6
144RAMDQ6
MD 7
143RAMDQ7
MD15
142RAMDQ15
MD14
MD13
+3.3V
C175
220p
50V
139RAMDQ13
140RAMDQ14
141VDD_8
138VSS_18
MD12
137RAMDQ12
MD9
MD8
MD11
MD10
133RAMDQ8
134RAMDQ9
135RAMDQ10
136
RAMDQ11
IC100
GM6015
VDD_1
24 BDATA17
23 BDATA18
22 BDATA19
21
20 BDATA20
19 BDATA21
18 BDATA22
17 VSS_3
16 BDATA23
15 BHREF_DE
14 BCREF
13 BRAWHS_CS
12 CVDD_1
11 VSS_2
10 BHS_CS
C157
C187
100n
16V
10k
47p
R185
C156
50V
S127
22u
50V
+3.3V
CVDD_2.5
VCLK_MAIN
1k
R144
OVACTIV
10k
R149
12FBKG
1k
R154
1k
13B
R155
14G
15R
MC141585
2 PIX_IN
3NC
4 VDD_1
5 HSYNC
1k
180R
R150
R152
OVHS
+5V
16V
100n
C178
OVVS
OVHS
OVCLK
OVACTIV
C169
220p
50V
+3.3V
R142
1k
Q104
R139
BC848B
1k
R138
Q103
BC848B
1k5
16VSS_2
IC101
1 VSS_1
OVCLK
DQM
131RAMWE
132RAMDQ_MSK
26 VSS_4
25 BDATA16
C158
220p
50V
CVDD_2.5
C164
220p
50V
130CVDD_6
27 CVDD_2
CVDD_2.5
R143
Q105
BC848B
R137
1k5
INTENSITY
R165
129VSS_17
28 BDATA15
YUV7
1k
WE#
CAS#
7
R1R2R3
33R
234
18
127VSS_16
128RAM_CAS
30 BDATA13
29 BDATA14
YUV6
YUV5
RAS#
6
C174
100n
16V
126RAM_RAS
31 BDATA12
YUV4
R136
1k5
INTENSITY
CS0#
5
R4
125RAMCS
32 BDATA11
YUV3
INTENSITY
BA_0
R1R2R3
33R
R166
18
+3.3V
123RAMBS0
124VDD_7
34 BDATA10
33 VSS_5
YUV2
BA_1
765
234
122RAMBS1
35 BDATA9
YUV1
IC109
NKL
R4
MA0
MA10
120RAMADDR0
121RAMADDR10
37 BDATA7
36 BDATA8
YUV0
S+3.3V
C223
100n
16V
16VCC
1Y0
HSYNC_PCIN
MA1
MA2
118RAMADDR2
119RAMADDR1
39 BDATA5
38 BDATA6
15X2
2Y2
S139
117VSS_15
40 VSS_6
C159
100n
16V
HDTV_VS
MAIN PWB ASS'Y(1/8)
VE-20177794
CVDD_2.5
C162
22u
50V
C163
100n
16V
115CVDD_5
116RAMCLK
42 BDATA4
41 CVDD_3
CVDD_2.5
HD_PC_VS
14X1
3 COM_Y_OUT_IN
HD_PC_HS
MA9
113RAMADDR9
114VSS_14
44 BDATA2
43 BDATA3
S138
13COM_X_OUT_IN
M74HC4052
4Y3
MA7
MA8
111RAMADDR7
112RAMADDR8
46 BDATA0
45 BDATA1
VSYNC_PCIN
12X0
5Y1
HDTV_HS
MA5
MA6
109RAMADDR5
110
RAMADDR6
GPIO1
48 GPIO2
47
11X3
6 INH
MA4
MA3
107RAMADDR3
108RAMADDR4
50 DVS_SYNCT
49 DHS_CS
VGA_SW
10A
7VEE
C172
220p
50V
105VSS_13
106VDD6
52 DDE_BLANK
51 VDD_2
C168
100n
+3.3V
16V
8 GND 9B
PVSYNC
PHSYNC
MD16
MD17
MD18
MD19
MD20
MD21
+3.3V
104RAMDQ16
103RAMDQ17
102RAMDQ18
101RAMDQ19
100RAMDQ20
99RAMDQ21
98RAMDQ22
97RAMDQ23
96RAMDQ31
95VSS_12
94RAMDQ30
93RAMDQ29
92RAMDQ28
91RAMDQ27
90RAMDQ26
89VDD_5
88RAMDQ25
87RAMDQ24
86CVDD_4
85VSS_11
84DDATA0
83DDATA1
82VSS_10
81DDATA2
80DDATA3
79DDATA4
78DDATA5
77DDATA6
76DDATA7
75DDATA8
74DDATA9
73DDATA10
72DDATA11
71VSS_9
70VDD_4
69DDATA12
68DDATA13
67DDATA14
66DDATA15
65DDATA16
64DDATA17
63DDATA18
62DDATA19
61DDATA20
60DDATA21
59VSS_8
58DDATA22
57DDATA23
56VSS_7
55VDD_3
54DCLK
53DODD
PHDE
+3.3V
C171
100n
16V
CVDD_2.5
C161
220p
50V
47R
18
R1
2
7
R2
3
6
R3
4
5
R4
R132
47R
18
R1
2
7
R2
3
6
R3
4
5
R4
R133
47R
18
R1
2
7
R2
3
6
R3
4
5
R4
R130
C170
220p
50V
+3.3V
R131
47R
18
R1
2
7
R2
3
6
R3
4
5
R4
R134
47R
18
R1
2
7
R2
3
6
R3
4
5
R4
R135
47R
18
R1
2
7
R2
3
6
R3
4
5
R4
C160
220p
50V
CVDD_2.5
R167
47R
SCLK
15p
50V
C218
MD22
MD23
MD31
MD30
MD29
MD28
MD27
MD26
MD25
MD24
GA0
GA1
GA2
GA3
GA4
GA5
GA6
GA7
BA0
BA1
BA2
BA3
BA4
BA5
BA6
BA7
RA0
RA1
RA2
RA3
RA4
RA5
RA6
RA7
(No.YA235)2-5 2-6(No.YA235)
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