Tatung Vibrant VM77S Service Manual page 23

5-5 Out of Horizontal Synchronization
5-6 Out of Vertical Synchronization
Out of Horizontal
Synchronization
Horizontal
sync present at
pin 15 of I401
Yes
Check
I401 pin 8 H. output
frequency & pin 29
waveform
Yes
Check Q401,
T401, Q402,
R424, D401
Out of Verizontal
Synchronization
Verizontal
sync present at
pin 14 of I401
Yes
Check
I401 pin 24 waveform
Yes
Check I401 pin 13 & pin 14.
Check or replace
the signal cable or
No
H. sync pin 41
of I701.
Check or replace
No
I401, C406
Check signal cable
& V. sync pin 42
No
of I701.
Check or replace
No
C303, I401,
VM77S