Sharp LC-30HV2E, Руководство по обслуживанию

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58
LC-30HV2E
TROUBLE SHOOTING TABLE
(Continued)
No Picture (1)
YES
NO
YES
No e
xter
nal input <SCAR
T1 A
V
>
Chec
k the line betw
een
pin (20) of SCAR
T1 and
pin (3) of IC1301.
YES YES
No e
xter
nal input <SCAR
T2 A
V
>
Chec
k the line betw
een
pin (20) of SCAR
T2 and
pin (10) of IC1301.
YES
NO
YES
No e
xter
nal input <SCAR
T3 A
V
>
NO
Chec
k IC1301 and its
per
ipher
al circuits
.
Is there A
V
signal input
at pin (17) of IC1301 (A
V
SWITCH)?
Is there A
V
signal input
at pin (10) of IC1301 (A
V
SWITCH)?
Is there A
V
signal input
at pin (3) of IC1301 (A
V
SWITCH)?
YES
Are there MAIN-R/G/B signal inputs at pins (5), (7) and (9) of IC811 (30MHz L.P
.F
.), respectiv
ely?
YES
NO
Chec
k IC811 and
its per
ipher
al
circuits
.
YES
YES
YES
NO
Chec
k IC810 and
its per
ipher
al
circuits
.
Are there SUB-R/G/B signal outputs at pins (13), (11) and (10) of IC810, respectiv
ely? (in STD mode)
Are there SUB-R/G/B signal outputs at pins (13), (11) and (10) of IC811, respectiv
ely? (in HDTV mode)
Chec
k the line betw
een
pin (20) of SCAR
T3 and
pin (17) of IC1301.
YES
NO
Chec
k the line betw
een
IC405 and IC801.
YES
Are there MAIN-Y signal inputs at pins (1) and (44) of IC801 (MAIN
VIDEO CHR
OMA) as w
ell as MAIN-C signal inputs at pins
(43) and (48)(composite signal at pin (1) in SECAM system)?
NO
Chec
k the line betw
een
IC402 and IC802.
Are there SUB-Y signal input at pin (44) of IC802 (SUB VIDEO CHR
OMA) (at pin (1) in NTSC system) as w
ell as
SUB-C signal input at pin (43) (at pin (48) in NTSC system)?
YES
NO
Chec
k IC801 and its
per
ipher
al circuits
.
YES
Are there MAIN-Y/Cb/Cr signal outputs at pins (21), (22) and (23) of IC801, respectiv
ely?
NO
Chec
k IC802 and its
per
ipher
al circuits
.
Are there SUB-Y/Cb/Cr signal outputs at pins (21), (22) and (23) of IC802, respectiv
ely?
YES
NO
Chec
k the line betw
een
IC801 and IC803.
YES
Are there MAIN-Y/Cb/Cr signal inputs at pins (69), (68) and (67) of IC803 (RGB DECODER), respectiv
ely?
NO
Chec
k the line betw
een
IC802 and IC804.
Are there
SUB-Y/Cb/Cr
signal inputs at pins (5), (9)
and (7) of IC804 (6.7MHz L.P
.F
.), respectiv
ely?
YES
NO
Chec
k IC803 and its
per
ipher
al circuits
.
YES YES
Are there MAIN-R/G/B signal outputs at pins (35), (37) and (39) of IC803, respectiv
ely?
NO
Chec
k IC804 and its
per
ipher
al circuits
.
Are there SUB-R/G/B signal outputs at pins (13), (11) and (10) of IC804, respectiv
ely?
NO
NO NO
Select INPUT1 A
V
on
the men
u screen.
Select INPUT2 A
V
on
the men
u screen.
NO
Is INPUT3 A
V
selected
on the Input Select men
u screen?
Is INPUT2 A
V
selected
on the Input Select men
u screen?
Is INPUT1 A
V
selected
on the Input Select men
u screen?
Select INPUT3 A
V
on
the men
u screen.
Are there MAIN and SUB video signal outputs at pins (56) and (44) of IC1301, respectiv
ely?
YES
NO
Chec
k the lines betw
een
IC1301, IC405 and IC402.
Are there video signal inputs at pins (1) and (2) of IC405 (MAIN COMB FIL
TER) and IC402 (SUB COMB FIL
TER)?
Chec
k the PC I/F unit.
<MAIN system>
<SUB system>
<HDTV mode>
<STD mode>
Are there MAIN-R/G/B signal inputs at pins (5), (7) and (9) of IC810 (6.7MHz L.P
.F
.), respectiv
ely?
C A D
F
B E