Tatung Vibrant VM77S Service Manual page 20

5-2 OSD Abnormal
OSD Abnormal
Check I502 pin 9, 4
is 5V and pin 5, 10, 7, 8
missing?
No
Check R517, L514,
R527, R523, R524
OK?
Yes
Check P502
OK?
Yes
Replace I502
Put on
Yes
I502
No
Replace them
No
Replace it
VM77S