Read Sharp LC-30HV4E (serv.man10) Service Manual online
55
LC-30HV4E
(A),(C),(E),(G)
(B),(D),(F)
<When video signal is received>
Are the main video signal and sub video signal sent from pin 56 and pin 44 of IC1301 respective
ly?
<When
Y/C signal is received>
Are the main
Y
signal, main C signal, sub
Y
signal and sub C signal sent from pin 56, pin 58, pin
44 and pin 47 of
IC1301 respectively?
Check IC1301 (A
V switch) and its peripheral
circuits.
<When video signal is received> Is the video signal applied to pin 7 of IC401 (main comb filter) and pin 7 of IC402 (sub comb f
ilter)?
<When
Y/C signal is received>
Are the main signal and sub signal applied to pins 44 and 43 of IC801 (main video chroma) and pin
s 5 and 7 of IC802
(sub video chroma) respectively?
Check lines and devices between IC1301
and IC401/IC402/IC801/IC802.
<Main system>
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
<When video signal is received>
Are the main
Y
signal and main C signal
applied to pin 1 (TP812) and pin 48 of
IC801 (main video chroma) respectively?
<When video signal is received>
Check lines and devices between IC4001
and IC801.
(IC403, Q415, etc.)
<When
Y/C signal is received>
Are the main
Y
signal and main C signal
applied to pin 44 and pin 43 of IC801 (main
video chroma) respectively?
<When
Y/C signal is received>
Check lines and devices between IC1301
and IC801.
(Q827, Q403, Q404, etc.)
Are the main
Y
, Cb and Cr signals sent
from pins 21, 22 and 23 of IC801
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)
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 applied to
pins 3, 7 and 10 of FL810 (6.7/30 MHz
L.P
.F
.) respectively?
Are the main R, G and B signals sent from
pins 19, 15 and 12 of FL810 respectively?
Check lines and devices between IC803
and FL810.(Q801-3 etc.)
Is cutof
f frequency setting pin 17 of FL810
(6.7/30 MHz L.P
.F
.) pulled high?
Check FL810 (6.7/30 MHz L.P
.F
.) and its
peripheral circuits.
Check the PC I/F unit.
<Sub system>
<When video signal is received>
Are the sub
Y
signal and sub C signal
applied to pin 1 and pin 7 of IC802 (sub
video chroma) respectively?
<When video signal is received>
Check lines and devices between IC402
and IC802.
(IC404, Q416-8, etc.)
<When
Y/C signal is received>
Are the sub
Y
signal and sub C signal
applied to pin 5 and pin 7 of IC802 (sub
video chroma) respectively?
<When
Y/C signal is received>
Check lines and devices between IC1301
and IC802.
(IC828, Q409, Q410, etc.)
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/Q 905-6 (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 and
Q905-6 (6.7 MHz L.P
.F
.).
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