No image (4)
No image when TV signal is received
Check the PC I/F unit.
Is the video signal on tuner image output
pin (19) of tuner (TU1101/1102)?
Check peripherals of the tuner
(TU1101/1102) and replace if necessary.
Are the tuner video signal inputs of IC1103
(AV switch) in order?
Pin (63) of IC1301 (MAIN TUNER IN)
Pin (60) of IC1301 (SUB TUNER IN)
Is the level control signal sent from pin (1),
(12) of IC1105 to pin (6), (2) of IC1104
(LEVEL ADJ)?
YES
NO
NO
NO
NO
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES YES
Are the MAIN/SUB video signal sent from
pin (30) of IC1301 and pin (44) of IC1301
respectively?
Check IC1301 (AV switch) and its
peripheral circuits.
NO
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/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/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/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/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/B signals sent from pins
(19), (15) and (12) of FL810 respectively?
Is cutoff 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.
Are the MAIN-R/G/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/C signals applied to pin (1)
(TP813) and pin (48) (TP407) of IC802
(SUB VIDEO CHROMA) respectively?
Are the SUB-Y/Cb/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/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/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>
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