NO
YES
Check IC801 and its peripheral
circuits.
NO
YES
Is HD2/VD2 outputted to
pins (9) and (4) of IC802
(SUB VIDEO CHROMA),
respectively?
Check IC802 and its
peripheral circuits.
NO
YES
Is HD1/VD1 outputted to pins
(28) and (27) of IC1901 (PLD),
respectively?
Is HD1/VD1 outputted to pins (9)
and (4) of IC801 (MAIN VIDEO
CHROMA), respectively?
Check the circuit between pins
(9)/(4) of IC801 and pins
(27)/(28) of IC1901.
NO
YES
Is HD2/VD2 inputted to
pins (41) and (42) of
IC1901 (PLD),
respectively?
Check the circuit
between pins (9)/(4) of
IC802 and pins
(41)/(42) of IC1901.
NO
YES
Check IC1901 and its
peripheral circuits.
NO
YES
Is HDS/VDS inputted to
pins (39) and (40) of
IC1901 (PLD),
respectively?
Check IC1901 and its
peripheral circuits.
NO
YES
Is HD3/VD3 inputted to pins
(14) and (13) of IC604 (Sync.
Sep), respectively?
Check the circuit between pins
(7)/(6) 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, respectively?
Check IC604 and its peripheral
circuits.
NO
YES
Is SP-HD/SP-VD/SP-CP
inputted to pins (5) , (3) and (8)
of IC1901, respectively?
Check the circuit between pins
(16)/(28)/(15) of IC604 and pins
(5)/(3)/(8) of IC1901.
NO
YES
Is PL-HD/PL-VD/PL-CP/PL-BLK
outputted to pins (30) , (29), (31)
and (31) of IC1901, respectively?
Check IC1901 and its
peripheral circuits.
NO
YES
Is Hsync/Vsync/SCP inputted to
pins (1) , (2) and (31) of IC803
(RGB DECODER), respectively?
Check the circuit between pins
(30)/(29)/(31)/(32) of IC1901
and pins (1)/(2)/(31) of IC803.
NO
YES
Is HS/VS outputted to pins
(29) and (28) of IC803,
respectively?
Check IC803 and its peripheral
circuits.
Check PC I/F Unit.
Is HD3/VD3 outputted to pins
(7) and (6) of IC1901 (PLD),
respectively?
<MAIN system; 15k>
<SUB system>
<MAIN system; RGB, COMPONENT>
Synchronization failure
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