Sharp LC-30HV2E, Руководство по обслуживанию

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60
LC-30HV2E
TROUBLE SHOOTING TABLE
(Continued)
No picture (4)
NO
YES
Is INPUT4 selected in Input Source?
Select INPUT4 in Input Source
.
NO
YES
Is INPUT4 selected in Input Source?
Select INPUT4 in Input Source
.
NO
YES
Is video signal input a
vailab
le at
pin (22) of IC1301 (A
V SWITCH)?
Chec
k the circuit
betw
een J3401
(front INPUT4) A
V
ter
minal and pin
(22) of IC1301.
NO
YES
Is
Y signal input
av
ailab
le at pin (24)
and C signal input at pin (26) of IC1301 (A
V SWITCH)
respectiv
ely?
Chec
k the circuit
betw
een pins (2)
and (1) and pins (24) and (26) of IC1301.
NO
Is MAIN-Y signal output a
vailab
le at pin (56)
and MAIN-C signal output at pin (58) of IC1301 respectiv
ely?
Is SUB-Y signal output a
vailab
le at pin (44) and
SUB-C signal output at pin (47) of IC1301 respectiv
ely?
Chec
k IC1301
and per
ipher
al
circuits
.
Sync
hr
onization failure
NO
YES
Is VDM/HDM
output
a
v
ailab
le at pins (28)
and (29) of IC803 (RGB DECODER)?
Chec
k IC803 and
per
ipher
al circuits
.
NO
NO
YES
Is HI/VI input a
v
ailab
le
at pins (66)/(1) and (65)/(2) of IC803?
Chec
k the circuit
betw
een pins (34)
and (35) of IC1901 and pins (66)/(1) and (65)/(2) of IC803.
NO
YES
Is PL-HD/VD output a
vailab
le at pins (34) and
(35) of IC1901 (PLD)?
Chec
k IC1901 and
per
ipher
al circuits
.
YES
MAIN:
Is HD1/VD1 input a
v
ailab
le at pins (44) and (2) of IC1901?
SUB:
Is HD2/VD2 input a
v
ailab
le at pins (19) and (20) of IC1901?
COMPONENT
: Is SP HD/VD input a
v
ailab
le at pins (40) and (5) of IC1901?
NO
Is HD1/VD1 output a
v
ailab
le
at pins (9) and (4) of IC801 (MAIN VIDEO
CHR
OMA)?
Chec
k IC801 and per
ipher
al
circuits
.
YES NO
Is SP HD/VD output a
v
ailab
le at pins (16) and
(28) of IC604 (SYNC SEP)?
Chec
k IC604 and per
ipher
al
circuits
.
YES NO
Is HD2M/VD2 output a
vailab
le
at pins (9) and (4) of IC802 (SUB VIDEO
CHR
OMA)?
YES
Is video signal input a
v
ailab
le at pin (21) of
IC1601 (TELETEXT CPU)?
Is
TELETEXT compatib
le broadcast receiv
ed (or are signals from other
TELETEXT compatib
le
equipment receiv
ed at video input ter
minal), and is
TELETEXT selected on remote controller?
Chec
k the circuit betw
een
pin (56) of IC1301 and pin (21) of IC1601.
NO
YES
Is signal input a
vailab
le at pins
(57), (58) and (59) of IC1601?
Chec
k IC1601 and its
per
ipher
al circuits
.
NO
Is signal input a
v
ailab
le at
pins (57), (53) and (55) of IC1301 (A
V SWITCH)?
Chec
k the circuit betw
een
pins (57), (58) and (59) of IC1601 and pins (57), (53) and (55) of IC1301.
YES
NO
Select TELETEXT
in
accordance with the specified procedure
.
Chec
k IC802 and per
ipher
al
circuits
.
No TELETEXT
screen
NO
YES
Is HDS/VDS output a
v
ailab
le at pins
(21) and (22) of IC1901 (PLD)?
Chec
k IC1901
and per
ipher
al
circuits
.
NO
No e
xter
nal input picture (INPUT4 A
V
)
No e
xter
nal input picture (INPUT4 S-IN)
No picture (5)
NO
Is video signal output a
v
ailab
le at
pin (41) of IC1301 (A
V SWITCH)?
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) and
of IC1401 J1101 (monitor video output ter
minal).
Chec
k the circuit
betw
een pins (39)
and (37) of IC1301 and pins (3), (4) of J1102 (monitor S- OUT ter
minal).
Confir
m
input signal is S-INPUT
.
No monitor picture (A
V)
No monitor picture (S-OUT)
Chec
k
IC1301 and per
ipher
al
circuits
.
MAIN
SUB
Chec
k the
circuit betw
een
pins (9) and (4) of IC801 and pins (19) and (20) of IC1901.
C
A B
Chec
k
IC1301 and per
ipher
al
circuits
.