Sharp PZ-43MR2U, Service Manual

Page: 53 / 146

53
PZ-MR2T
PZ-43MR2U
PZ-50MR2U
TROUBLE SHOOTING TABLE
(Continued)
C
NO
A B
Is MAIN-Y signal output a
v
ailab
le at pin (56) and MAIN-C signal output at pin (58) of IC1301, respectiv
ely?
Is SUB-Y signal output a
v
ailab
le at pin (44) and SUB-C signal output at pin (47) of IC1301, respectiv
ely?
Is
Y signal input
a
v
ailab
le at pin (3)
and C signal input at pin (5) of IC1301 (A
V
SWITCH), respectiv
ely?
No picture (3)
YES
No e
xter
nal input picture (INPUT1 S-IN)
NO
Is "INPUT1" selected on Input Select men
u
screen?
Select "INPUT1" on men
u selection
screen.
YES
NO
Chec
k the circuit
betw
een pins
(9)/(10) of SC1101 and pins (3)/(5) of IC1301.
Is
Y signal input
a
v
ailab
le at pin (10)
and C signal input at pin (12) of IC1301 (A
V SWITCH),
respectiv
ely?
YES
No e
xter
nal input picture (INPUT2 S-IN)
NO
Is "INPUT2" selected on Input Select men
u
screen?
Select "INPUT2" on men
u selection
screen.
YES
NO
Chec
k the circuit
betw
een pins
(3)/(4) of SC1101 and pins (10)/(12) of IC1301.
Is
Y signal input
a
v
ailab
le at pin (17)
and C signal input at pin (19) of IC1301 (A
V SWITCH),
respectiv
ely?
YES
No e
xter
nal input picture (INPUT3 S-IN)
NO
Is "INPUT3" selected on Input Select men
u
screen?
Select "INPUT3" on men
u selection
screen.
YES
NO
Chec
k the circuit
betw
een pins
(2)/(1) of SC1102 and pins (9)/(10) of IC1301.
Is
Y signal input
a
v
ailab
le at pin (24)
and C signal input at pin (26) of IC1301 (A
V SWITCH),
respectiv
ely?
YES
No e
xter
nal input picture (INPUT4 S-IN)
NO
Is "INPUT4" selected on Input Select men
u
screen?
Select "INPUT4" on men
u selection
screen.
YES
NO
Chec
k the circuit
betw
een pins
(2)/(1) of J3401 and pins (24)/(26) of IC1301.
Chec
k IC1301 and
its per
ipher
al
circuits
.
No picture (4)
NO
NO
Is
Y signal output
a
v
ailab
le at pin (39)
and C signal output at pin (37) of IC1301 (A
V SWITCH),
respectiv
ely?
YES
YES
YES
Chec
k the circuit
betw
een pin (41) of
IC1301 and pin (20) of J1104.
Chec
k the circuit
betw
een pins
(39)/(37) of IC1301 and pins (3)/(4) of SC1102.
Confir
m
input signal is S-INPUT
.
No monitor picture (A
V
-OUT)
No monitor picture (S-OUT)
Chec
k
IC1301 and its per
ipher
al
circuits
.
Chec
k
IC1301 and its per
ipher
al
circuits
.
Is video signal output a
v
ailab
le at
pin (41) of IC1301 (A
V SWITCH)?
YES YES YES
No picture (5)
NO
No TV
picture
Is video output a
v
ailab
le at pin
(19) of
TU1101 and
TU1102
(U/V tuner)?
Chec
k U/V tuner and
its per
ipher
al circuits
.
NO
Is video input signal a
v
ailab
le
at pins (63) and (60) of IC1301?
Chec
k the circuit betw
een pin
(19) of
TUNER and pins
(63)/(60) of IC1301.
C