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Troubleshooting
NO PICTURE
AV BOARD
1. Check that the Vcc-voltages(+5V, -5V) are applied to
AV circuits.
Pins 47-50 of K10A, Pins 47-54 of K10B ......................5V
Pins 39-42 of K10B ......................................................-5V
Check IC1001, IC1002 and IC1021.
2. Check that the following input signals are observed
correctly.
SIGNAL
K10A-pin No.
V-Sync
17-18
H-Sync
15-16
B
11-12
G
9-10
R
7-8
Video
33-34
S-C
29-30
S-Y
25-26
MAIN BOARD
1. Check the signals at following test points.
- Video signal at TP208, TP218
- V-sync signal at TP7224
- H-sync signal at TP7223
PC_R
R
PC_G
G
PC_B
B
IC1001
18
H-SYNC
4
G-SYNC
SEP.
21
V-SYNC
1
IC1021
7
IC1002
VIDEO
VIDEO/S-VIDEO
S-Y
S-C
Cr/Pr
Cb/Pb
AV BOARD
COMPO-
NENT
BOARD
R-
LCD
PANEL
G-
LCD
PANEL
B-
LCD
PANEL
K50A-pin No.
17-18
15-16
11-12
9-10
7-8
33-34
29-30
25-26
3
TP211
16
1
4
PC/AV
6
SW
TP212
8
5
12
IC5201
TP213
9
11
H-SYNC
IC5282
V-SYNC
TP218
8
5
S/VIDEO
-SW
3
1
IC5281
9
12
TP219
Q5211
16
TP217
TP502
TP501R
TP1501
R-S/H
-1
TP502R
IC501
R-S/H
-2
IC1501
TP532
TP503G
TP1531
G-S/H
-1
TP504G
G-S/H
IC531
-2
IC1401
IC1531
TP1401
TP562
PSIG
TP505B
TP1561
B-S/H
-1
TP506B
IC561
B-S/H
-2
IC1561
IC1451
TP1451
FRP
PSIG
2. Check that the PC/AV switching signal is correct.
Pin 16 of IC5201 ................................AV: H, PC: L
Pin 5 of IC5282....................................AV: H, PC: L
3. Check that the RGB signals are observed at follow-
ing test points.
TP211, TP221R, TP2211R..........................R-signal
TP212, TP221G, TP2221G ........................G-signal
TP213, TP221B, TP2231B ..........................B-signal
4. Check that the signals are observed at following test
points.
TPDHS, TP3322..........................................V-Sync,
TPDVS, TP3321 ..........................................H-Sync
5. Check that the RGB drive signals are observed at
following test points.
TP501 ........................................................R-signal
TP531 ........................................................G-signal
TP561 ........................................................B-signal
6. Check that the S/H signals are observed at following
test points.
TP501, TP1501, TP501R, TP502R ............R-signal
TP531, TP1531, TP503G, TP504G ............G-signal
TP561, TP1561, TP505B, TP506B..............B-signal
7. Check that the PSIG signals are observed at test
points TP1401 and TP1451.
PC/AV
Q5112
TP221R
IC5251
7
R/Cr/Pr
TP221G
15
IC5252
G/Y
TP221B
IC5253
22
B/Cb/Pb
TP7223
5
SYNC
SEP.
71
TP7224
IC6901
128
TP5112
VIDEO
18
TP5113
20
S-Y
TP5111
S-C
16
S/VIDEO
TP2211R
R
G
TP2221G
TP2231B
B
22
24
26
TP501
18
LCD
47
R
DRIVER
16
IC401
14
TP531
G
47
TIMING
CONTROL
TP561
IC3301
B
47
HCLK/STV/HST/ENB
-35-
A/D
DIGITAL
RGB
IC202
MATRIX
IC6101
TPDVS
SYSTEM
CONTROL
DIGITAL
TPDHS
&
VIDEO
SCAN CONV.
DECODER
IC5101
IC301
IC2211
46
D/A
IC2221
43
IC2200
IC2231
40
MAIN BOARD
DCLK/DHS/DVS
TP3321
5
BUFFER
IC3321
TP3332
6
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