Sanyo PLC-EF12B, Service Manual

Page: 45 / 112

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Troubleshooting
PICTURE
SIGNAL
LINES
RED
PANEL
S & H
IC501
S & H
IC1501
S & H
IC531
S & H
IC1531
S & H
IC561
S & H
IC1561
GREEN
PANEL
BLUE
PANEL
TP2513
TP2503
TP2512
TP2502
TP2511
TP2501 TP501
TP1501
TP531
TP1531
TP1561
TP561
D/A
IC1351
D/A
IC1361
IC1352
IC1353
IC1354
IC1362
IC1364
LCD
PANEL
DRIVER
IC401
IC1363
46
43
40
43
40
46
TP5201
TP5221
TP5241
TP4201
TP4221
TP4241
TP201
TP202
TP203
IC201
IC202
IC203
IC4201
IC4221
IC4241
IC5201
IC5221
IC5241
A/D
LATCH
IC4302
LATCH
IC4303
16BIT TO
8BIT
CON-
VERTER
IC4301
DIGITAL
I/F
IC5301
SWITCH
IC2131
R
B
G
D
I
G
I
T
A
L
R
B
G
CG 1
INPUT
CG 2
INPUT
INTERFACE BOARD
4
5
11
14
3
5
VIDEO/Y/y
C/B-y
R-y
R-y
C/B-y
VIDEO/Y/y
AV 1 INPUT
AV 2 INPUT
SWITCH
IC3001
SWITCH
IC3021
3
13
4
9 10
9 10
TP161
TP171
SWITCH
IC105
AV
SIGNAL
PROCES-
SOR
IC101
YUV TO
RGB
CON-
VERTER
IC102
62
63
1
13
3
67 63 65
14
4
15
5 2 12
IC1101
IC1104
IC1112
IC1113
1 3
3
3
1
1
PROGRESSIVE
SCAN
CONVERTER
SCAN CONVERTER
IC301
VIDEO
BOARD JACK
BOARD
MAIN BOARD
TP181
TP1100
Y
C/B-y
R- y
9 10 11
16
R
G
B
SWITCH
IC4001
15
4
3L-Y/C
IC4002
V/C
IC6100
SECAM
IC6103
23 25
3
3
5
2
1
TP4000
TP4002
T
P
4001
TP4003
Y
C
1. Check that the Vcc-voltages(S5V/S-5V) are correct.
(IC2131,etc)
2. Check the input and output signal at IC2131.
3. Check that the CG1/CG2 SELECT signal is correct.
Pin16 of IC2131 ........................... CG1 : H / CG2 : L
1. Check the Vcc-voltages at all IC.
2. Check that the AV/CG SELECT signal is correct.
Pin9,10,11 of IC105
3. Check the signals at TP161, 181, 171.
4. Check the input and output signals at IC105.
5. Check the signals at TP201, 202, 203.
6. Check the signals at TP4201, 4221, 4241, 5201,
5221, 5241.
7. Check the signals at TP501, 1501, 531, 1531, 561,
1561.
8. Check the signals at TP2501, 2511, 2502, 2512,
2503, 2513.
MAIN BOARD
INTERFACE BOARD
1. Check that the Vcc-vo9V) are correct.
(IC3001, IC3021, etc)
2. Check that the AV1/AV2 SELECT signals are cor-
rect.
3. Check the input and output signals at IC3001.
Check the input and output signals at IC3021.
1. Check that the Vcc-vo9V and +5V) are sup-
plied correctly to ICs (IC4000,4001, IC6100, etc).
2. Check the signals at TP4000, TP4001, TP4002,
TP4003, TP4010.
VIDEO BOARD
AV JACK BOARD
NO PICTURE