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1.2 No picture
The following items are suspected as possible causes of "no picture". Check the items
by referring to the block diagrams of the signal processing system on the next page.
1) No picture at video input
●
Video input
Check that the video signal is observed at K10R on the AV unit and pins 3 and 4 of
K8A on the main board.
Check that Y and C signals are observed at pin 15 of IC1141.
Check that Y and C signals are observed at pins 5 and 7 of IC3101.
Check pin 22 of IC101.
IN2: Low
IN3: High
●
S-video input
Check that the Y and C signals are observed at pins 47-48 (Y) and 51-52 (C) of
K10R and K8A.
Check that the Y and C signals are observed at pins 42 and 44 of IC3101.
●
Component input
Check that the component signal is observed at pins 7 and 8 (Pb) and pins 11 and
12 (Pr) of K10R and K8A.
Check that the Y, Pr and Pb signals are observed at test points TP4111PB,
TP4111PR and TP4111Y.
Check the IN2/IN3 switching signal is observed at pin 22 of IC101.
IN2: Low
IN3: High
●
All video signal input
Check that the Y, Cr and Cb signals are observed at test points TP401CR, TP401CB
and TP401Y.
Check that the Y, Cr and Cb signals are observed at pins 67, 68 and 69 of IC4101.
Check that the Y, Pr and Pb signals are observed at pins 73, 74 and 75 of IC4101.
Check that the synchronizing signals (AV_HSYNC, AV_VSYNC) are observed at pins
4 and 9 of IC3101.
Check that the synchronizing signals (AV_HSYNC, AV_VSYNC) are observed at pins
65 and 66 of IC4101.
Check that the RGB signals are observed at pins 35, 37 and 39 of IC4101.
Check that the RGB signals are observed at pins 14, 15 and 4 of IC4181.
Check that the RGB signals are observed at pins 8, 10 and 12 of IC201.
Check that the synchronizing signals (AV_HSYNC, AV_VSYNC) are observed at pins
1 and 3 of IC3231.
Check that the CG/HD switching signal is observed at pins 22 of IC201 and pins 9
and 10 of IC3231.
CG: Low
HD: High
Part 4: Troubleshooting
4-4
Содержание D78-5232
Страница 2: ...CANON Power Projector LV 7545E D78 5231 SERVICE SMANUAL ...
Страница 9: ......
Страница 10: ...Part 1 General Information ...
Страница 23: ...7 SUPPORTED COMPUTER SYSTEM MODE See the attached sheet Owner s Manual page 26 Part 1 General Information 1 13 ...
Страница 24: ......
Страница 25: ...Part 2 Repair Information ...
Страница 46: ...Part 3 Adjustment ...
Страница 69: ...Part 4 Troubleshooting ...
Страница 86: ...Part 4 Troubleshooting 4 17 BH3540 Volume Control IC1652 CXA2101AQ RGB Matrix IC4101 ...
Страница 87: ...Part 4 Troubleshooting 4 18 FA5332M P F Controller IC601 FA7612CA PWC Controller IC6602 IC6603 IC6616 ...
Страница 90: ...Part 4 Troubleshooting 4 21 LB1645 Motor Drive IC1601 LC863316 SUB CPU IC1851 ...
Страница 91: ...Part 4 Troubleshooting 4 22 ML60851 USB I F IC9801 M62393 D A IC212 IC2381 ...
Страница 92: ...Part 4 Troubleshooting 4 23 M62399 D A IC3501 IC3551 PW365 System Control Scan Converter IC301 ...
Страница 93: ...Part 4 Troubleshooting 4 24 SII161ACT DVI I F IC8001 STR Z2156 Power Switching IC651 ...
Страница 94: ...Part 4 Troubleshooting 4 25 TA1287 RGB YUV Converter IC4551 TB1274AF Video Decoder IC1101 ...
Страница 95: ...Part 4 Troubleshooting 4 26 TDA7056 Audio Output IC1631 IC1632 ...
Страница 96: ...Part 5 Parts Catalog ...
Страница 97: ......
Страница 101: ...62 54 63 53 62 58 61 64 56 59 70 71 52 55 65 Page 2 CANON LV 7545J REF No D78 5231 LV 7545U D78 5232 LV 7545E D78 5233 ...
Страница 105: ...Page 4 CANON LV 7545J REF No D78 5231 LV 7545U D78 5232 LV 7545E D78 5233 23 a 23 b 23 51 b 51 a 51 43 43 2 ...
Страница 113: ...Part 6 Electrical Diagrams ...
Страница 130: ......