Sharp Aquos LC-30HV4E, Руководство по обслуживанию

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57
LC-30HV4E
Chec
k the PC I/F unit.
<When COMPONENT/RGB signal is receiv
ed>
No image (5)
No RGB 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 RGB on the Input Select screen. Chec
k lines and de
vices
betw
een pins (15), (11), (7) of
SC1101 (INPUT1) and pins (63)
, (59)
, (61) of IC1301.
No RGB 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 RGB 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 (15), (11), (7)
of (SC1102) INPUT3 and pins (9), (5), (7) of IC1301.
No COMPONENT image on INPUT3
Has "INPUT3" been selected on the Input Select screen?
Select INPUT3 COMPONENT on the Input Select screen.
Are RGB signals applied to pins (5), (17) and (19) of IC1401 (A
V s
w
itch)?
Chec
k lines and de
vices
betw
een pins (8), (26), (17)
of J1101 (INPUT3) 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
w
itched 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 IC1401 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