Sharp Aquos LC-30HV4U, Service Manual

Page: 63 / 254

63
LC-30HV4U
LC-30HV4D
Chec
k the PC I/F unit.
<When COMPONENT/D
VI signal is receiv
ed>
No image (3)
No COMPONENT image on INPUT1
Has "INPUT1" been selected on the Input Select screen? Are RGB signals applied to pins (63), (59) and (61) of IC1401 (A
V s
w
itch)?
Select INPUT1 COMPONENT
on the
Input Select screen. Chec
k lines and de
vices
betw
een pins (8), (26), (17)
of J1103 (INPUT1) and pins (63), (59), (61) of IC1301.
No
COMPONENT
image on INPUT3
Has "INPUT3" been selected on the Input Select screen?
NO NO
YES
NO NO NO NO NO
YES YES YES YES YES YES YES YES YES
YES
NO NO NO
YES
YES
NO NO NO NO NO NO NO
YES YES YES YES YES YES
Select INPUT3 COMPONENT
on the Input
Select screen.
Are RGB signals applied to pins (9), (5) and (7) of IC1401 (A
V s
w
itch)?
Chec
k lines and de
vices
betw
een pins (8), (26), (17)
of J1104 (INPUT3) and pins (9), (5), (7) of IC1301.
No D
VI image on INPUT3
Has "INPUT3" been selected on the Input Select screen?
Select INPUT3 D
VI on the
Input Select screen.
Are D
V
I signals applied to
pins (2), (3), (5), (6), (48), (49), (51), (52) of IC1650 (D
VI D/A)?
Chec
k lines and de
vices
betw
een SC1650 (INPUT3)
and IC1650.
NO
YES YES
Are RGB signals applied to pins (23), (26), (31) of IC1650?
Chec
k per
ipher
als of IC1650
(D
VI D/A).
NO
YES
Are RGB signals applied to pins (15), (17) and (19) of IC1401 (A
V s
w
itch)?
Chec
k lines and de
vices
betw
een pins (23), (26), (31)
of IC1650 and pins (15), (17), (19) of IC1301.
Are the MAIN video signal sent from (46)/(50)/(48), P
ASS signal sent from (34)/(38)/(36) and SUB video signal sent from pins (4
0)/(44)/(42) of IC1401 respectiv
ely?
Are
Y/Cb/Cr signals applied to pins
(19), (18) and (17) of IC801 (MAIN VIDEO CHR
OMA) respectiv
ely?
<MAIN 525i system>
<P
ASS 525P/1125i/750P system>
Chec
k lines and de
vices betw
een
pins (46), (50), (48) of IC1401 and pins (19), (18), (17) of IC801.
Are the MAIN-Y/Cb/Cr signals sent from pins (21), (22) and (23) of IC801 respectiv
ely?
Chec
k IC801 (MAIN
VIDEO CHR
OMA) and its
per
ipher
al circuits
.
Are the MAIN-Y/Cb/Cr signals applied to pins (69), (68) and (67) of IC803 respectiv
ely?
Chec
k lines and de
vices
betw
een IC801 and IC803.
(IC814, Q814-5, etc.)
Are
Y/Cb/Cr signals applied to
pins (5), (4) and (3) of IC803 (RGB DECODER) respectiv
ely?
Chec
k lines and de
vices betw
een
pins (34), (38), (36) of IC1401 and pins (5), (4), (3) of IC803.
Are the MAIN-R/G/B signals sent from pins (35), (37) and (39) of IC803 respectiv
ely?
Chec
k IC803 (RGB DECODER)
and its per
ipher
al circuits
.
Are the MAIN-R/G/B signals applied to pins (3), (7) and (10) of FL810 (6.7/30 MHz L.P
.F
.) respectiv
ely?
Chec
k lines and de
vices
betw
een IC803 and FL810.
(Q801-3 etc.)
Are the MAIN-R/G/B signals sent from pins (19), (15) and (12) of FL810 respectiv
ely?
The cutoff frequency of FL810 (L.P
.F
.) is s
witched as f
ollo
ws
depending on the input signals:
Status of pin (17) f
or setting the
cutoff frequency of FL810 (6.7/30 MHz L.P
.F
.)
<525i system>:
High
<525P/1125i/750P system>:
Lo
w
Chec
k FL810 (6.7/30 MHz L.P
.F
.)
and its per
ipher
al circuits
.
<SUB system>
Are
Y/Cb/Cr signals applied
to pins (19), (18) and (17) of IC802 (SUB
VIDEO
CHR
OMA) respectiv
ely?
Chec
k IC1401 (A
V s
w
itch)
and its per
ipher
al circuits
.
Chec
k lines and de
vices
betw
een pins (40), (44), (42)
of IC 1401 and pins (19), (18), (17) of IC802.
Are the SUB-Y/Cb/Cr signals sent from pins (21), (22) and (23) of IC802 respectiv
ely?
Chec
k IC802 (SUB
VIDEO
CHR
OMA) and its per
ipher
al
circuits
.
Are the SUB-Y/Cb/Cr signals applied to Q901-2, Q903-4 and Q905-6 (6.7 MHz L.P
.F
.) respectiv
ely?
Chec
k lines and de
vices betw
een
IC802 and Q901-2/Q903-4/Q905- 6 (6.7 MHz L.P
.F
.).
Are the SUB-R/G/B signals sent from Q901-2, Q903-4 and Q905-6 (6.7 MHz L.P
.F
.) respectiv
ely?
Chec
k per
ipher
als of Q901-
2/Q903-4/Q905-6 (6.7 MHz L.P
.F
.).
•
AVC System