LG Electronics CT-25 Service Sheet of MC-007A P/N: 3854VA0071A-S2 2000.06.15

JW1A
MAIN PWB ASSY
P602
P601
P181
PV01
P05A
P01
P03B
P05B
P402A
PP802
P401
P03A P802 P801
CPT PWB
PP803
PP801
SPEAKER CONNECTOR
D-COIL
CABINET
WIRING DIAGRAM
VCD PROCESSOR
VDP3120
AUDIO AMP
LA4282
IC601
H/P
ICN02
TDA2822M
S-Video
IN
Y/V3 C
AV3-IN
A3 V3
(R,L)
R L
HP Amp.
3
34/37/38/39
31
60/61/62/63/64
59
32
50
45/46/47/48
4
RF/V1/V2/V3
SDA
SCL
EXT.RGB_IN Y/C IN & V1/2/3/4
EW
H-out
Va
VM & RGB
EEPROM
24C16
IC02
CPT DRIVE AMP.
TDA6101Q * 3
IC901/2/3
LOCAL KEY
EYE
SENSOR
PRE-
AMP.
IR
TILT
HIC181
SDA
SCL
IF1
TUNER
5V
33V
AGC
L/L S/W
SAW ±
SAW ≤
SAW I
IF2 Sound Processor
MSP3410D/3460G ICN01
VIF/SIF
IC101 TDA4470
27
28
1
2 23 313
24
25
7614
SiF1
SiF2
S_SW V_SW
V_SW
ViF FM
AM
47
44 30 31 42 41 2728 40 39
38 37 24/25 21/22
A1_OUTA1_IN A2_INA2_OUT
A3_IN
132 6 132 6
AV1_SCART/PHONE AV2_SCART/PHONE
R(0) L(0) R(I) L(I) R(0) L(0) R(I) L(I)
5V
OTHER L (M)
AM FM
RGB
OUT
A/V S/W
CXA2040Q
SCREEN
FOCUS
V/M
V_DY
VERTICAL AMP
LA7845/40 IC301
FBT
T402
DYNAMIC
FOCUS
HDT
KIA4558
210V
H / T
HV
14V -14V
VA
H-OUT
POWER CTL.
STR-F6656
IC801
ST_BY(2W)
POWER
(OPTION)
AC_IN
110~240V
5V REG
IC851
ST-BY 5V
K3958M / K6263K(w/M)
L9654M
K9350M / K9253M(w/M)
13V
LA7016
GAME
SOUND
SOUND BOARD
D-FOCUS
BOARD
RGB
V2(MNT) OUT
RF OUT V1(TV) OUT
TVTXT(MICOM + TEXT)
SDA5555/5521 IC01
TXT RGB
38/39/40/41 CVBS 12
41/42/43/44
TXT RGB
SDA0
SCL0
SDA
SCL
SDA0
SCL0
EXT.
RGB
PIP IC
SDA9489
PIP or VCD
BOARD
5V REG
IC854/5
9V REG
IC852/3
3.3V REG
IC04
13V
9V
5V
TUNER 33V
SOUND Vcc
B+
28 S-VIDEO SEL.
BLOCK DIAGRAM
TROUBLESHOOTING GUIDE
C804
F(P)801, SW(P)801, T1111,
T801, R802, DB801.
pin4
T802, R809, D802.
18V
ICP(V)01.
ICP(V)01.
Q401, Q402, T401.
(OPTION)
33V
F854, D861, R405.
D850, L853, T402.
3V
pin 32 of IC01.
3.3V 0V
IC01, FR403, FR413,
D405, D406, IC301,
ICP(V)01.
IC852(3), IC854(5), FR406,
D408, D858, Q856.
Q05, IC851, IC802(3), IC856.
37~39 12
ICP(V)01, Q124
CPT PCB ASSY.
ICP(V)01.
ICP(V)01.
ICP(V)01.
P901.
Q2902~2910, VM COIL.
FR403, FR413, D405, D406. ICP(V)01.
ICP(V)01. IC301, D301.
ICP(V)01.
ICP(V)01. IC302.
R408.
Q302, Q303. D401, D402, C405.
FR402, D404, IC302.
ICP(V)01, QP(V)04~06.
at pin 44 of ICP(V)01.
at pin 12 of IC01.
at pin 41~43 of ICP(V)01.
ICP(V)01.
QP(QV)02, ICP(V)01.
3V
P502A.
'
pin 10 of IC601(SOUND AMP).
F851, FB853, D850.
IC601.
8
ICN01.
ICN01.
Check the Waveform
at pin 44 of ICN01.
Q601, IC01.
Z102, IC101.
Z102, Z103, IC101.
XN01, ICN01.
IC601, QN01~02, P605(6)A.
5V0V
Check/Replace
XN01, ICN01. Check the voltage at pin 3 of IC101.
NO
* AM Sound(for FRENCH)
NORMAL
ICN01.
ICN01. 1, 3 ICN02.
ICN02.
P605(6)A,
No
No
Yes
Yes
Abnormal
Abnormal
Normal
Normal
Is there video signal at
pin 13 of ICP101?
Check/Replace ICP101.
Check I2C Bus.
Is there video signal at
pin 28 of ICP102?
Check pins15~18
of ICP102.
NO PIP
Check CP131.
Check/Replace ICP102.
Check I2C BUS.
Check pins45~48
of ICP01.
Check RP108, 109, 110, 112, 114,
CP17~19. Check/Replace
ICP01.
'
9
7
12 L102
F854, D861, R104, ZD101.
ICP(V)01
IC01 15
Check/Replace IC01, IC02.
Check I2C BUS.
ICP(V)01, Q124.
Service Sheet of MC-007A
P/N: 3854VA0071A-S2
2000.06.15