Sharp LC-30HV2E, Service Manual

Page: 59 / 173

59
LC-30HV2E
TROUBLE SHOOTING TABLE
(Continued)
No picture (2)
NO
YES
NO
YES
No e
xter
nal input picture (SCAR
T2
Y/C)
Is INPUT2
Y/C selected on
Input Select men
u screen?
Select INPUT2
Y/C on
men
u selection screen.
Is
Y signal input a
vailab
le at
pin (10) and C signal input at pin (12) of IC1301 (A
V
SWITCH) respectiv
ely?
Chec
k the circuit betw
een
pins (20) and (25) of SCAR
T2 and pins (10) and
(12) of IC1301.
Chec
k the circuit betw
een
pins (20) and (15) of SCAR
T3 and pins (17) and
(19) of IC1301.
Chec
k the circuit
betw
een pin (23) of
TUNER and pin (63) of IC1301.
NO
YES
NO
YES
NO
No e
xter
nal input picture (SCAR
T3
Y/C)
Is INPUT3
Y/C selected on
Input Select men
u screen?
Select INPUT3
Y/C on
men
u selection screen.
Is
Y signal input a
vailab
le at
Pin (17) and C signal input at pin (19) of IC1301 (A
V
SWITCH), respectiv
ely?
Chec
k IC1301 and
per
ipher
al circuits
.
NO
YES
NO
YES
No TV
picture
Is video output a
vailab
le at pin
(23) of
TU1101 (U/V tuner)?
Chec
k
TUNER and its
per
ipher
al circuit.
Is video input signal a
v
ailab
le at pin (63) of
IC1301 (A
V SWITCH)?
No picture (3)
NO
YES
NO
YES
No e
xter
nal input picture (SCAR
T1 RGB)
Is INPUT1 RGB selected on Input Select men
u
screen?
Select INPUT1 RGB on men
u selection screen.
Is RGB signal input a
v
ailab
le at pins (59),
(61) and (63) of IC1401 (A
V SWITCH)?
Chec
k the circuit
betw
een pins (15), (11)
and (7) SCAR
T and pins
(59), (61) and (63).
NO
YES
NO
YES
No e
xter
nal input picture (SCAR
T3 RGB)
Is INPUT3 RGB selected on Input Select men
u
screen?
Select INPUT3 RGB on men
u selection screen.
Is RGB signal input a
v
ailab
le at pins (5), (7)
and (9) of IC1401 (A
V
SWITCH)?
Chec
k the circuit betw
een
pins (15), (11) and (7) of SCAR
T3 and pins (5), (7)
and (9) of IC1401.
NO
YES
NO
YES
No component picture
Is INPUT3 COMPONENT selected on Input Select men
u screen?
Select INPUT3 COMPONENT on men
u
selection screen.
Is component signal input a
v
ailab
le at pins (15), (17)
and (19) of IC1401 (A
V
SWITCH)?
Chec
k the circuit betw
een
J1101 (component signal input ter
minal) and
IC1401 pins (15), (17) and (19) of IC1401.
NO
YES
Is RGB signal output a
v
ailab
le at pins (50), (48)
and (46) of IC1401?
Chec
k IC1401 and
per
ipher
al circuits
.
NO
YES
Is RGB signal output a
v
ailab
le at pins (50), (48)
and (46) of IC1401?
Chec
k IC1401 and
per
ipher
al circuits
.
NO
YES
YES
YES
YES
Is component signal output a
v
ailab
le at pins (38), (36)
and (34) of IC1401?
Chec
k IC1401 and
per
ipher
al circuits
.
NO
Is RGB signal input a
vailab
le
at pins (27), (26) and (25) of IC801 (MAIN
VIDEO
CHR
OMA) respectiv
ely?
Chec
k the circuit betw
een
pins (5), (48) and (46) of IC1401 and pins (27), (26) and (25) of IC1801.
NO
Is RGB signal input a
vailab
le
at Pins (27), (26) and (25) of IC802 (SUB
VIDEO
CHR
OMA) respectiv
ely?
Chec
k the circuit betw
een
pins (50), (48) and (46) of IC1401 andpins (27), (26) and (25) of IC802.
NO
Is component signal input a
v
ailab
le at pins (3), (4)
and (5) of IC803 (RGB DECODER) respectiv
ely?
Chec
k the circuit betw
een
pins (38), (36) and (34) of IC1401and pins (3), (4) and (5) of IC803.
C
A B
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?
DE
F