JVC XV-BP1C Service Manual page 17

5.6 AUDIO (S/PDIF, OPTICAL)
No Audio
C917
Digital Audio
output OK?
YES
JK903 Red
Lighting OK?
YES
S/PDIF, OPTICAL
audio out OK
NO
IC301 Check
NO
JK903 (Pin2)
+5.0V OK?
JK903 Re-soldering
NO
IC204 Check
(No.MB706<Rev.002>)1-17