ViewSonic VX800-3 Service Manual - Page 49
No Sound Test signal: 1r.m.s sine waveform
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4.5 No Sound (Test signal: 1r.m.s sine waveform) Check that ICA3 Pin 7 is approximately 12V YES Check that ICA1 Pin 3 is approximately 9V NO Check that Q306 Pin 4 is Low voltage YES Check ICA2 pin11 Pin15 signal is FIG 17. NO Check ICA1 pin2 is about 12V YES Check Q306 Pin5, 6, 7, 8 is12V NO Q306 failure NO Failure point 1. JA1 failure 2. IC400 pin123 failure YES YES Check ICA3 pin 4, 6 is FIG18. NO Failure point 1.ICA1 failure 2.IC400 pin 123 failure YES Check ICA5, ICA6 pin 4 is about 5V NO Failure point YES NO ICA5 or ICA6 failure 1. QA6 or QA7 failure 2. ICA3 failure IC400 pin 125 failure ViewSonic Corporation 55! Confidential - Do Not Copy VX800-3
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4.5 No Sound (Test signal: 1r.m.s sine waveform)
YES
YES
NO
Check that ICA3 Pin 7 is approximately 12V
Check that ICA1 Pin 3 is
approximately 9V
Check that Q306 Pin 4 is
Low voltage
YES
NO
Check Q306
Pin5, 6, 7, 8 is12V
Failure point
1. JA1 failure
2. IC400 pin123 failure
Check ICA2 pin11
Pin15 signal is
FIG 17.
Check ICA1 pin2
is about 12V
NO
YES
YES
NO
Check ICA5, ICA6 pin 4 is
about 5V
Failure point
1. QA6 or QA7 failure
2. ICA3 failure
YES
NO
Check ICA3 pin 4, 6
is FIG18.
Failure point
1.ICA1 failure
2.IC400 pin 123 failure
ICA5 or ICA6 failure
IC400 pin 125 failure
YES
NO
NO
Q306 failure
ViewSonic Corporation
Confidential – Do Not Copy
VX
8
00-3