Samsung GH15LS - Page 15

WAVEFORMS
4 Troubleshooting
4-4 GH15LS/GH15ES/GH15MS
4-3 User Controls Don’t Work
No
Does the DC level change at
Pin 35 and 36 of IC301 when you
push the front panel button?
Check the buttons.
(SW801~SW808)
Yes
Refer to 4-4 No OSD Display.
4-4 No OSD
There is video but no OSD.
While pushing a front control button does
any pulse appear at Pin 46,47
and 55, 56 and 63,64 of IC105?
5
No
Do sync signals appear at Pin 44,
150 and 43 of IC105?
1
Replace IC105.
3
Yes
Replace IC105 or check its
related circuit.
Replace IC105 or check
its related circuit.
2
Replace CN251.
Replace IC251 and IC252.
Yes
No
5