Hitachi 36UX52B\CZ77 Service Manual page 49

M7LXU
TROUBLESHOOTING
@ NO SOUND (WHEN SURROUND OFF)
18V
Yes
b
1403 defective
CZ77, CY77 only
No Except CZ77, CY77
YES
1 SRS PWB ASSY
NO
1) Check the l*C bus (SCL3, SDA3)
2) Check the Dynamic Bass circuit
NO
YES
+
IYOl defective
1
NO
YES
NO
Except CZ73: UlOl, front-end circuits defective
Only CZ73: UlOlA defective
49