-44-
The possible causes of No Picture are listed below. Please
check following and refer to video signal processing dia-
grams in the figure opposite.
1. No picture from Video source
Composite Video Input
Check composite video signal at pins 3 and 4 of K10R on
AV Board and K8A on Main Board.
Check Y, C signals at pins 15 and 14 of IC1141.
Check Y, C signals at pins 5 and 7 of IC3101.
Check IN2/IN3 signal at pin 22 of IC101.
IN2 : Low, IN3 : High
S-Video Input
Check S-video signals at pins 47-48 (Y), 51-52(C) of
K10R and K8A.
Check Y, C signals at pins 43 and 44 of IC3101.
Component Input
Check component signals at pins 7-8 (Pb), 11-12 (Pr) and
3-4 (Y) of K10R and K8A.
Check component signals (Y, Pr, Pb) at pins 19, 18 and
17 of IC3101.
Check IN2/IN3 signal at pin 22 of IC101.
IN2 : Low, IN3 : High
All of video signals
Check component signals (Y, Cr, Cb) at pins 33, 34 and
35 of IC4001.
Check component signals (Y, Cr, Cb) at pins 20, 21 and
22 of IC4501.
Check component signals (Y, Pr, Pb) at pins 41, 42 and
43 of IC4001.
Check Sync signals (AV_HSYNC, AV_VSYNC) at pins 4
and 9 of IC3101.
Check Sync signals (AV_HSYNC, AV_VSYNC) at pins 4,
36, 5 and 37 of IC4001.
Check RGB signals at test points TP4541R, TP4542G
and TP4543B.
Check RGB signals at test points TP13R, TP13G and
TP13B.
Check RGB signals at pins 8, 10 and 12 of IC201.
Check Sync signals at test points TPGHS and TPGVS.
Check AV/CG1 switching signal at pin 22 of IC201 and
pin 1 of IC3224.
AV : Low, CG : High
2. No picture from Computer source
Check RGB signals at pins 19-20, 23-24 and 27-28 of
K10Q on AV Board and K8B on Main Board.
Check Sync signals (CG_HSYNC, CG_VSYNC) at pins
11-12 and 13-14) of K10Q on the AV Board and K8B on
the Main Board.
Check RGB signals at test points TP21R, TP21G and
TP21B.
Check sync signals at test point TPHS and TPVS.
Check CG1/CG2 switching signal at pin 22 of IC5201 and
pins 16 of IC5204. The CG1/CG2 switching signal is out-
put from pin 50 of IC1801.
CG1 : Low, CG2 : High
Check CG/HD switch signal at pin 22 of IC201 and pins 9,
10 of IC3231. The CG/HD signal is out put from pin 52 of
IC1801.
CG : Low, HD : High
3. No picture from both of Video and Computer
sources.
Check RGB signals at test points TP21R, TP21G and
TP21B.
Check HSYNC signal at test point TPHS and VSYNC sig-
nal at TPVS.
4. No picture from DVI source.
Check 5V power supply(5VDVI) at pins 1 and 2 of K10P.
Check Sync signal at pins 47 and 48 of IC8001.
Check ICs IC8001 and peripheral circuits.
5. No picture from all of sources
Check RGB S&H signals at test points TP501, TP1501,
TP531, TP1531, TP561 and TP1561.
Check NRS signal at test point TP3671 and TP3681.
Check power supply circuit 15.5V and 15VP and peripher-
al circuit.
Check ICs IC501, IC531, IC561, IC1501, IC1531, IC1561,
IC9401, IC401, IC3301 and peripheral circuits.
Troubleshooting
No Picture
SIGNAL
K10Q/K8B
CG1/CG2-SW
5-6
H-Sync
11-12
V-Sync
13-14
B
19-20
G
23-24
R
27-28
SIGNAL
K10R/K8A
AV_Y/Video
3-4
AV_PB
7-8
AV_PR
11-12
S_SW-IN
15-16
IN2/IN3-SW
33-34
S-Y
47-48
S-C
51-52
Summary of Contents for PLV-70
Page 57: ... 57 CXA2150 RGB Matrix IC4501 IC Block Diagrams BH3540 Volume Control IC1652 ...
Page 58: ... 58 CXA2151 RGB Matrix IC4001 FA5332M P F Controller IC601 IC Block Diagrams ...
Page 62: ... 62 ML60851 USB I F IC9801 IC Block Diagrams LB1641 Motor Drive IC1602 IC1611 ...
Page 63: ... 63 M62399 D A IC3501 IC3551 IC Block Diagrams M62392 D A IC2381 ...
Page 64: ... 64 IC Block Diagrams SII161ACT DVI I F IC8001 PW365 System Control Scan Converter IC301 ...
Page 65: ... 65 TB1274AF Video Decoder IC3101 IC Block Diagrams STR Z2156 Power Switching IC651 ...
Page 66: ... 66 IC Block Diagrams TDA7056 Audio Output IC1631 IC1632 TC90A69F Digital Comb Filter IC2101 ...
Page 67: ... 67 uPD64083 3D Y C Separation IC1101 ...
Page 98: ...M4L 7000 Mechanical Parts List 98 51 a 51 43 43 51 b 23 a 23 b 23 ...
Page 101: ...M4L 7000 101 Optical Parts List 58 45 45 ...
Page 103: ...M4L 7000 103 ...
Page 104: ... M4LA Sep 2002 BB 400 Printed in Japan SANYO Electric Co Ltd ...
