Table of Contents
Advertisement
4-3 User Controls Don't Work
Does the DC level change at
Pin 35 and 36 of IC311 when you
push the front panel button?
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
5
any pulse appear at Pin 46,47
and 55, 56 and 63,64 of IC105?
Yes
Replace IC105.
Replace IC251 and IC252.
Replace CN251.
4-5 No SOUND
Does the DC 12V appear at Pin
2 of IC801 and Pin 6 of CN801?
Yes
Does the sound input signal
appear at Pin 6 and 7 of IC801?
Yes
Does the sound signals appear at
Pin 1 and 3 of IC801?
Yes
Check CN805 and CN806 outputs.
CN15V*
No
Check the buttons.
(SW801~SW808)
3
No
1
Do sync signals appear at Pin 44,
150 and 43 of IC105?
Replace IC105 or check its
related circuit.
Replace IC105 or check
its related circuit.
No
Check IC801, VR803 and related circuit.
No
Check Pin 1 and 3 of CN801
and related circuits.
No
Check IC801 related circuits.
5
No
2
Yes
CH1 RMS= 2.2V
4 Troubleshooting
IC105 #46,47,55,56,63,64
4-3
Advertisement
Table of Contents
