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ViewSonic Corporation
Е771-4
6-5 Out of Horizontal Synchronization
Out of Horizontal
Synchronization
Ckeck or replace
the signal cable or
1701
Horizontal
sync present at
pin 15 of 1401
Yes
Check
1401 pin 8 H output
frequency
Check or replace
the signal cable
or I701
Yes
Check Q401, T401, Q402,
R4A6, D402, R403, D402
6-6 Out of Vertical Synchronization
Out of Vertical
Synchronization
Vertical sync
present at
pin 14 of 1401
Ckeck signal cable &
vertical sync input &
1701
Yes
Check
1401 pin 24 ramp
frequency
Check C441
Confidential - Do Not Copy
Page 25
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