Sharp XV-Z12000 Service Manual page 39

No horizontal synchronization is being supplied from the
external synchronization input. This is not normal.
Is the terminal input
connection as specified? Is
the cable tightly
connected?
NO
Is there the horizontal sync
pulse at pin (14) of
IC2506?
YES
Is there the horizontal
sync pulse at pin (11) of
IC2509?
YES
Go to "PC Board
Troubleshooting".
No vertical synchronization is being supplied from the
external synchronization input. This is not normal.
Is the terminal input
connection as specified? Is
the cable tightly
connected?
NO
Is there the vertical sync
pulse at pin (14) of
IC2501?
YES
Is there the vertical sync
pulse at pin (8) of
IC2509?
YES
Go to "PC Board
Troubleshooting".
YES
Use the specified cable.
Reconnect it tight enough.
NO
Check the line between
IC2506 and the input
terminal.
NO
Check the line between
IC2506 and IC2509.
YES
Use the specified cable.
Reconnect it tight enough.
NO
Check the line between
IC2501 and the input
terminal.
NO
Check the line between
IC2506 and IC2509.
39
XV-Z12000