Sharp LC-30HV4E (serv.man10) Service Manual ▷ View online
56
LC-30HV4E
Check the PC I/F unit.
A
VC System
<When component/RGB signal is received>
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 switch)?
Select INPUT1 RGB on
the Input Select screen.
Check lines and devices
between pins 15/1
1/7 of
INPUT1 (SC1
101) 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 switch)?
Check lines and devices
between pins 15/1
1/7 of
INPUT3 (SC1
102) 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 switch)?
Check lines and devices
between pins 8/26/17 of
INPUT3 (J1
101) and pins
15/17/19 of IC1301.
Are the main video signal, pass signal and sub video signal sent from pins 34, 38 and 36 of IC1401 respectively?
Are
Y,
Cb and Cr signals applied
to pins 19, 18 and 17 of IC801
(main video chroma) respectively?
<Main 525i system>
<Pass 525P/1
125i/750P
system>
Check lines and devices between
pins 46/50/48 of IC1401 and pins
19/18/17 of IC801.
Are the main
Y
, Cb and Cr
signals sent from pins 21, 22
and 23 of IC801 respectively?
Check IB801 (main video
chroma) and its peripheral
circuits.
Are the main
Y
, Cb and Cr
signals applied to pins 69, 68
and 67 of IC803 respectively?
Check lines and devices
between IC801 and IC803.
(IC814, Q814-5, etc.)
Are
Y
, Cb and Cr signals applied
to pins 5, 4 and 3 of IC803
(RGB decoder) respectively?
Check lines and devices
between pins34/38/36 of
IC1401 and pins 5/4/3 of IC803.
Are the main R, G and Br
signals sent from pins 35, 37
and 39 of IC803 respectively?
Check IC803 (RGB decoder)
and its peripheral circuits.
Are the main R, G and Br
signals applied to pins 3, 7 and
10 of IC810 (6.7/30 MHz L.P
.F
.)
respectively?
Check lines and devices
between IC803 and FL810.
(Q801-3 etc.)
Are the main R, G and Br
signals sent from pins 19, 15
and 12 of IC810 respectively?
The cutof
f frequency of FL810
(L.P
.F
.) is switched as follows
depending on the input
signals:
Status of pin 17 for setting the
cutof
f frequency of FL810 (6.7/30
MHz L.P
.F
.)
<525i system>: High
<525P/1
1
25i/750P
system>: Low
Check FL810 (6.7/30 MHZ L.P
.F
.)
and its peripheral circuits.
<Sub system>
Are
Y
, Cb and Cr signals
applied to pins 19, 18 and 17
of IC802 (sub video chroma)
respectively?
Check IC1401 (A
V switch)
and its peripheral circuits.
Check lines and devices
between pins 40/44/42 of IC
1401 and pins 19/18/17 of
IC802.
Are the sub
Y,
Cb and Cr
signals sent from pins 21, 22
and 23 of IC802 respectively?
Check IC802 (sub video chroma)
and its peripheral circuits.
Are the sub
Y,
Cb and Cr signals
applied to Q901-2, Q903-4 and
Q905-6 (6.7 MHz L.P
.F
.)
respectively?
Check lines and devices between
IC802 and Q901-2/Q903-4/Q905-
6 (6.7 MHz L.P
.F
.).
Are the sub R, G and B signals
sent from Q901-2, Q903-4 and
Q905-6 (6.7 MHz L.P
.F
.)
respectively?
Check peripherals of Q901-
2/Q903-4/Q905-6 (6.7 MHz
L.P
.F
.).
57
LC-30HV4E
No image (6)
A
VC System
No image when
TV signal is received
Check the PC I/F unit.
No teletext screen appears.
Is the video signal on tuner image output
pin 23?
Check peripherals of the tuner (TU1
101)
and replace if necessary
.
Is the video signal on pin 5 of IC1
106 (level
adj.) or
TP1
101?
Is the video signal applied to pin 63 of
IC1301 (A
V switch)?
Is the level control signal sent from pin 1 of
IC1
108 to pin 8 of IC1
103 (A
V switch)?
YES
No Monitor image <A
V
-OUT>
YES
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
Check lines and devices between pin 5 of
IC1
106 and pin 63 of IC1301.
Are the main video signal and sub video
signal sent from pin 30 of IC1301 and pin
44 of IC1301 respectively?
Check IC1301 (A
V switch) and its
peripheral circuits.
Is the teletext signal received (is a teletext-supporting receiver connected to the video input
terminal) and
TELETEXT
selected on the remote controller?
Select
TELETEXT
in an appropriate manner
.
Is the video signal applied to pin 21 of
IC1601 (teletext CPU)?
Check lines and devices between pin 56 of
IC1301 (A
V switch) and pin 21 of IC1601.
Is the text signal sent from pins 57, 58 and
59 of IC1601?
Check IC1601 and its peripheral circuits.
Is the text signal applied to pins 57, 53 and
55 of IC1401 (A
V switch)?
Check lines and devices between pins 57/58/59
of IC1601 and pins 57/53/55 of IC1301.
NO
YES
NO
NO
NO
NO
YES
YES
YES
YES
Is the video signal applied to pin 7 of IC401 (main comb filter) and pin 7 of IC402 (sub comb filter)?
<Main system>
Are the main
Y
and C signals applied to
pin 1 (TP812) and pin 48 of IC801 (main
video chroma) respectively?
Check lines and devices between IC4001
and IC801.
(IC403, Q415, etc.)
Are the main
Y
, Cb and Cr signals sent from pins
21, 22 and 23 of IC801 respectively?
Check IC801 (main video chroma) and its
peripheral circuits.
Are the main
Y
, Cb and Cr signals applied to pins
69, 68 and 67 of IC803 (RGB decoder)
respectively?
Check lines and devices between IC801 and
IC803. (IC814, Q814, Q815, etc.)
Are the main R, G and B signals sent from
pins 35, 37 and 39 of IC803 respectively?
Check IC803 (RGB decoder) and its
peripheral circuits.
Are the main R, G and B signals sent from
pins 19, 15 and 12 of FL810 respectively?
Is cutof
f frequency setting pin 17 of FL810
(6.7/30 MHz L.P
.F
.) pulled high?
Is the video signal sent from pin 4 of
IC1301 (A
V switch)?
YES
Check lines and devices between pin 41 of
IC1301 and monitor image output pin 20 (J1
101).
(Q1403 and Q1
113)
Check IC1301 and its peripheral circuits.
No monitor image <S-OUT>
YES
NO
NO
Are
Y
and C signals sent from pins 39 and
37 of IC1301 (A
V switch) respectively?
YES
Check lines and devices between pins
39/37 of IC1301 and monitor S-OUT
pins
3/4 (SC1
102).
(Q1401-2)
Check that input signal is S-INPUT
.
Check FL810 (6.7/30 MHz L.P
.F
.) and its
peripheral circuits.
Are the main R, G and B signals applied to
pins 3, 7 and 10 of FL810 (6.7/30 MHz
L.P
.F
.) respectively?
Check lines and devices between IC803
and FL810.(Q801-3 etc.)
Check lines and devices between IC1301
and IC401/402.
NO
NO
Check lines and devices between IC402
and IC802. (IC404, Q416-8, etc.)
Are the sub
Y
and C signals applied to pin
1 (TP813) and pin 48 (TP407) of IC802
(sub video chroma) respectively?
Are the sub
Y
, Cb and Cr signals sent from
pins 21, 22 and 23 of IC802 respectively?
Check IC802 (sub video chroma) and its
peripheral circuits.
YES
NO
Are the sub
Y,
Cb and Cr signals applied to Q901-2,
Q903-4 and Q905-6 (6.7 MHz L.P
.F
.) respectively?
Check lines and devices between IC802 and
Q901-2/Q903-4/Q905-6 (6.7 MHz L.P
.F
.).
YES
NO
Are the sub R, G and B signals sent from Q901-2,
Q903-4 and Q905-6 (6.7 MHz L.P
.F
.) respectively?
YES
Check the PC I/F unit.
Check Q901-2, Q903-4 and Q905-6 (6.7
MHz L.P
.F
.) and their peripheral circuits.
<Sub system>
No image (7)
Chec
k
IC1301 and its per
ipher
al circuits
58
LC-30HV4E
TROUBLE SHOOTING TABLE
(Continued)
(AVC System)
NO
YES
Is HD1/VD1 outputted to pins
(9) and (4) of IC801,
respectiv
ely?
Chec
k IC801 and its per
ipher
al
circuits
.
NO
YES
Is HD2/VD2 outputted
to pins (9) and (4) of
IC802, respectiv
ely?
Chec
k IC802 and its
per
ipher
al circuits
.
NO
YES
Is HD1/VD1 outputted to pins
(44) and (2) of IC1901,
respectiv
ely?
Chec
k the circuit betw
een pins
(9)/(4) of IC801 and pins
(44)/(2) of IC1901.
NO
YES
Is HD2/VD2 inputted to
pins (19) and (20) of
IC1901, respectiv
ely?
Chec
k the circuit
betw
een pins (9)/(4) of
IC1901 and pins
NO
YES
Chec
k IC1901 and its
per
ipher
al circuits
.
NO
YES
Is HDS/VDS inputted to
pins (21) and (22) of
IC1901, respectiv
ely?
Chec
k IC1901 and its
per
ipher
al circuits
.
NO
YES
Is HD3/VD3 inputted to pins
(14) and (13) of IC604,
respectiv
ely?
Chec
k the circuit betw
een pins
(8)/(10) of IC1901 and pins
(14)/(13) of IC604.
NO
YES
Is SP-HD/SP-VD/SP-CP
outputted to pins (16) , (28) and
(15) of IC604, respectiv
ely?
Chec
k IC604 and its per
ipher
al
circuits
.
NO
YES
Is SP-HD/SP-VD/SP-CP
inputted to pins (40) , (5) and
(6) of IC1901, respectiv
ely?
Chec
k the circuit betw
een pins
(16)/(28)/(15) of IC604 and pins
(40)/(5)/(6) of IC1901.
NO
YES
Is PL-HD/PL-VD/PL-CP/PL-HBLK
outputted to pins (34) , (35), (33)
and (31) of IC1901, respectiv
ely?
Chec
k IC1901 and its
per
ipher
al circuits
.
NO
YES
Is Hsync/Vsync/SCP inputted
to pins (1) , (2) and (31) of
IC803, respectiv
ely?
Chec
k the circuit betw
een pins
(34)/(35)/(33)/(31) of IC1901
and pins (1)/(2)/(31) of IC803.
NO
YES
Is HS/VS outputted to pins
(29) and (28) of IC803,
respectiv
ely?
Chec
k IC803 and its per
ipher
al
circuits
.
Chec
k PC I/F Unit.
Is HD3/VD3 outputted to pins
(8) and (10) of IC1901,
respectiv
ely?
NO
YES
Is HD_50/VD_50 outputted to
pins (79) and (80) of IC803,
respectiv
ely?
Chec
k IC803 and its per
ipher
al
circuits
.
NO
YES
Is HD_50/VD_50 inputted to
pins (3) and (4) of IC803,
respectiv
ely?
Chec
k the circuit betw
een pins
(79)/(80) of IC803 and pins
(3)/(4) of IC604.
NO
YES
YES
Chec
k IC604 and its
per
ipher
al circuits
.
NO
Is SP-HD/SP-VD outputted to
pins (40) and (5) of IC1901,
respectiv
ely?
Chec
k the circuit betw
een pins
(16)/(28) of IC604 and pins
(40)/(5) of IC1901.
Is SP-HD/SP-VD outputted to
pins (16) and (28) of IC604,
respectiv
ely?
<MAIN system;
15k>
<MAIN system;
1080i/625P>
<SUB system>
<MAIN system;
D2/D3/D4>
Sync
hr
onization failure
59
LC-30HV4E
TROUBLE SHOOTING TABLE OF PC I/F UNIT
(AVC System)
NO
YES
No
TV
, video and component picture
Is input at pins (124),
(133) and (139) of IC4
nor
mal?
Chec
k CN6 and its
per
ipher
al circuits
.
NO
YES
Are TL207, TL208
and
TL211 nor
mal?
Chec
k CN6 and its
per
ipher
al circuits
.
NO
YES
Is digital output section of
IC4 nor
mal?
Chec
k IC4 and its
per
ipher
al circuits
.
NO
YES
Is digital output section
of IC310 nor
mal?
Chec
k IC310 and its
per
ipher
al circuits
.
NO
YES
Is digital output of IC25
nor
mal?
Chec
k IC25 and its
per
ipher
al circuits
.
No PC picture
YES
Is signal at pins (21), (22), (24), (25), (27), (28), (30) and (31)
of IC413? (The signal is of high frequency (a little less than
1GHz).
P
a
y due attention to it dur
ing obser
v
ation.)
Connecting cab
le or
monitor is prob
lem.
NO
PC I/F Unit (CPCi-
0056CE) inter
nal prob
lem
is lik
ely
.
No MAIN picture on single screen and dual screen.
No SUB picture on dual screen
NO
YES
Is input at pins (126),
(136) and (141) of IC4
nor
mal?
Chec
k CN8 and its
per
ipher
al circuits
.
NO
YES
Is digital output section
of IC4 nor
mal?
Chec
k IC4 and its
per
ipher
al circuits
.
NO
YES
Is digital output of IC25
nor
mal?
Chec
k IC25 and its
per
ipher
al circuits
.
No picture
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