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TROUBLE SHOOTING TABLE
Component signal input
being received
Are there input signals to
IC3004 at the following pins:
NO
(1) and (12) at COMP 1, (5)
and (14) at COMP 2, (2) and
(15) at COMP 3, and (4) and
(11) at COMP 4?
YES
NO
Are there output signals at
pins (3) and (13) of IC3004?
YES
NO
Are there output signals at pin (7)
of IC3005 and pin (7) of IC3006?
YES
NO
Are there output signals at pins
(10) and (21) of IC3012?
YES
NO
Are speakers active on
user adjustment menu?
YES
NO
Are there input signals at
pins (3) and (5) of SC?
YES
NO
Are there output signals at pins
(13), (15), (2) and (4) of IC3015?
YES
NO
Are there input signals at
LW, LT, RW and RT?
YES
Speakers defective
Checking audio circuit
NO
Check input terminal board.
Check IC3004 and its
peripheral circuits.
Check IC3005, IC3006 and
their peripheral circuits.
Check IC3012, IC3010, IC3011
and their peripheral circuits.
Check IC3017, IC3007 and
their peripheral circuits.
Check IC3014 and its
peripheral circuits.
Check IC3015 and its
peripheral circuits.
Check NET-R and NET-L
circuits.
41
(Continued)
Video / S signal input being
received
Are there input signals to
IC4022 at the following pins:
(2) and (4) at VIDEO 1, (9)
and (11) at VIDEO 2, and
(16) and (18) at VIDEO 3?
YES
NO
Are there output signals at
pins (52) and (54) of IC4022?
YES
LC-R60HDU
Check IC4022 and its
peripheral circuits.
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