Sanyo PLC-SU20B, Service Manual

Page: 39 / 100

-39-
A/D
IC202
SYSTEM
CONTROL
&
SCAN CONV.
IC301
3L-Y/C
SEP.
&
Switch
Circuit
IC2101
IC6151
VIDEO
CHROMA
PROCESSING
IC1101
D/A
IC2200
TIMING
CONTROL
IC3301
LCD
DRIVER
IC401
R-S/H
IC501
R-
LCD
PANEL
G-
LCD
PANEL
B-
LCD
PANEL
R-
LEVEL
SHIFT
IC3501
G-
LEVEL
SHIFT
IC3531
B-
LEVEL
SHIFT
IC3561
G-S/H
IC531
B-S/H
IC561
CG/AV
SYNC
SW
IC5281
IC5283
CG/AV
RGB
SW
IC5201
SYNC
SEP.
IC6131
CLOCK
DRIVER
IC3391
TP201
TP202
TP203
TPVRST
TPRST
TP501
TP502
TP512
TP513
TP511
TP503
TP214
TP215
TP216
TP2101
TP6131
TP221R
TP221G
TP221B
TP8254
TP8253
TP5281
TP5282
IC5251
IC5252
IC3561
IC1002
IC1001
IC5253
TP2211R TP2221G TP2231B
IC2211 IC2221 IC2231
TP217 TP218 TP219
TP401 TP402 TP403
VIDEO
H-SYNC
V-SYNC
R
G
B
MAIN COMP-D BOARD
AV BOARD
AV SUB
BOARD
MAIN COMP-B BOARD
MAIN COMP-C BOARD
MAIN COMP-A BOARD
VIDEO/S-VIDEO
H-SYNC
V-SYNC
CG_R
CG_G
CG_B
AV_H
AV_V
A
V_R
A
V_B
A
V_G
R
R
R
G
G
G
B
B
B
DCLK/DHS/DVS
H
V
HCLK/STV/HST/ENB
TP3571
FRP
Y/VIDEO
C
NRS
9 5
2
53
48
57
26
24 22
2
12
1
13
15
14 244
323
7
15
22 9
8
1
3
4
6
5
12
11
47
18
16
14
26 24 22
9
38
40
43 46
1
16
10,11
47
47
AV/CG
AV/CG
Q5211
CG: H
1. Check that the AV/CG switching signal is correct.
Pin 16 of IC5201 ...........................................AV: H, CG: L
Pins 10, 11 of IC5282 ....................................AV: L, CG: H
2. Check that the sync signals are correct.
TP5281, TP8254 ...................................................H-Sync
TP5282. TP8253 .....................................................V-Sync
3. Check that the RGB signals are observed at follow-
ing test points.
TP214,TP217,TP201, TP221R, TP2211R ............R-signal
TP215,TP218,TP202, TP221G, TP2221G ...........G-signal
TP216,TP219,TP203, TP221B, TP2231B.............B-signal
1. Check that the signals are observed at following test
points.
TP401, TP402, TP403 ...............................R, G, B signals
TPVRST, TPRST.......................................V-Sync, H-Sync
1. Check that the signals are observed at following test
points.
TP501, TP502, TP503, TP511, TP512, TP513
..........................................................R, G, B Drive signals
MAIN COMP-B BOARD
MAIN COMP-C BOARD
MAIN COMP-A BOARD
1. Check that the Vcc-vo5V, -5V) are applied to
AV circuits.
Pins 45-48 of K3001, pins 29-32 of K3002 ...................5V
Pins 51-54 of K3001, pins 35-38 of K3002 ..................-5V
Check IC1001 and IC1002.
2. Check that the following input signals are observed
correctly.
AV, AV SUB BOARD
NO PICTURE
SIGNAL K3001-pin No. K3002-pin No.
V-Sync 17-18 1-2
H-Sync 19-20 3-4
B 23-24 7-8
G 25-26 9-10
R 27-28 11-12
Video 35-35 15-16
S-C 39-40 25-26
S-Y 43-44 19-20
1. Check the signals at following test points.
- Video signal at TP2101
- V-sync signal at TP6131
- H-sync signal at pin 9 of IC6131
MAIN COMP-D BOARD
Troubleshooting