No Picture - Sanyo PLC-EF10EA Service Manual

Troubleshooting

NO PICTURE

AV JACK BOARD
1. Check that the Vcc-voltages(+9V) 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.
VIDEO BOARD
1. Check that the Vcc-voltages(+9V and +5V) are sup-
plied correctly to ICs (IC4000,4001, IC6100, etc).
2. Check the signals at TP4000, TP4001, TP4002,
TP4003, TP4010.
PICTURE
SIGNAL
LINES
VIDEO/Y/y
C/B-y
R-y
VIDEO/Y/y
C/B-y
R-y
V/C
IC6100
TP4000
Y
4 3
5
SWITCH
C
11
IC3001
13
14
25
3
9 10
3L-Y/C
IC4002
3
4
SWITCH
5
IC3021
9 10
JACK VIDEO
BOARD
BOARD
LCD
PANEL
DRIVER
IC401
AV 1 INPUT
AV 2 INPUT
SECAM
IC6103
TP4002
Y
TP161 62
1 15
AV
2
TP181 SIGNAL
SWITCH
5 PROCES-
IC4001 TP1100
4
63
SOR
3
IC101
C/B-y
23
TP4003
9 10 11
1
3
SWITCH
IC105
13
5 2 12
TP171
R- y
MAIN BOARD
INTERFACE BOARD
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
MAIN BOARD
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.
TP501
S & H
IC1352
IC501
46
TP1501
S & H
D/A
43
IC1501
IC1351
IC1353
40
TP531
S & H
IC1354
IC531
TP1531
S & H
IC1362
IC1531
43
D/A 46 TP561
S & H
IC1361
IC561
40 IC1363
TP1561
S & H
IC1364
IC1561
IC5201
SCAN CONVERTER
IC5221
IC301
IC5241
PROGRESSIVE
SCAN
CONVERTER
YUV TO
RGB
CON- IC1101
VERTER
IC102
67 65 63
14
15
4
IC1104
R
1 3
IC1112 G
1 3
B
1 3
IC1113
-44-
TP2501
RED
PANEL
TP2511
TP2502
GREEN
PANEL
TP2512
TP2503
BLUE
PANEL
TP2513
A/D
IC201
TP5201
TP4201
IC202
IC4201
TP5221
TP4221
IC4221 IC203
TP5241
TP4241
IC4241
LATCH
16BIT TO
IC4302
8BIT
CON-
VERTER
LATCH
IC4301
IC4303
DIGITAL
I/F
IC5301
16
SWITCH
IC2131
INTERFACE BOARD
TP201
T P 202
TP203
D
I
G
I
T
A
CG 1
L
INPUT
R
G
B
R
CG 2
G
INPUT
B