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1.5 No Sound
Check following steps.
●
Audio Circuit
Part 4: Troubleshooting
4-9
Check PC/AV-AUDIO switching circuit.
Check IC5001, audio-sw IC, and peripheral circuit.
Check signals "P_SCLK2" and "P_SDA2" at pins 13,14
of IC5001.
Sound volume and input selecting is controlled by
IC301<SYSTEM CONTROL> via the IIC bus.
Is the audio signal
observed at pins 10 and
21 of IC5001?
Yes
No
Check Audio amplifier circuit.
Check IC5031, audio-amp IC, and peripheral circuit.
MUTE signal (Mute:L) is applied on pin 1 of IC5031,
sent from pin 12 of IC1804.
Sound volume is controlled by IC301<SYSTEM
CONTROL> via the IIC bus.
Check 5V_AUDIO power supply line.
Is the audio signal
observed at pins 5 and
8 of IC5031?
Yes
No
Check audio output circuit.
Check speaker, connection of the terminal “K8F”.
Q5031
Q5061
Q5064
Q5063
Q5062
Q5036
Q5032
Q5033
4
1
30
9
27
22
14
13
21
8
12
5
10
Mute: H
Mute: L
K8Q
K3Y
K10Y
P_SCLK2
P_SD
A
2
MAIN BOARD
AV
BOARD
Q5034
IC5031
AMP.
<LM4889M>
L
R
L
R
L
R
PC
AUDIO-IN
AV
AUDIO-IN
SP901
IC1804
OUTPUT
EXPANDER
<74LCX574>
IC301
SYSTEM
CONTROL
<PW168A>
MUTE
IC5001
AUDIO-SW
<NJW1141>
L
R
AV
AUDIO-OUT
4
+
1
29
31
23
25
35
37
39
1
3
+
-
DATA BUS
OUT_DET
Содержание D78-5532
Страница 2: ...CANON Multimedia Projector LV X4U D78 5532 LV X4E D78 5533 SERVICE SMANUAL ...
Страница 9: ...Part 1 General Information ...
Страница 26: ...Part 2 Repair Information ...
Страница 43: ...Part 3 Adjustment ...
Страница 62: ...Part 4 Troubleshooting ...
Страница 79: ...Part 4 Troubleshooting 4 17 AN5870SB RGB SYNC SW IC5201 LM4889 Audio Amplifier IC5031 ...
Страница 81: ...Part 4 Troubleshooting 4 19 FA5502 P F Control IC621 VPC3230D Video Decoder IC101 ...
Страница 82: ...Part 4 Troubleshooting 4 20 L3E07070 Signal Processor for TFT LCD IC401 NJW1141 Audio Selector IC5001 ...
Страница 83: ...Part 4 Troubleshooting 4 21 STR Z2156A Power Switching Control IC631 PW168A Scaler Main CPU IC301 ...
Страница 84: ...Part 4 Troubleshooting 4 22 TA1370FG Sync Separator Frequency Counter IC5302 ...
Страница 85: ...Part 5 Parts Catalog ...
Страница 86: ......
Страница 94: ......
Страница 96: ...V 1 U 2 U 1 V 2 Z 1 Z 2 X Y W Accessories Page 5 CANON LV X4J LV X4U LV X4E REF NO D78 5531 D78 5532 D78 5533 ...
Страница 100: ...Part 6 Electrical Diagrams ...