Sharp LC-37AD1E Service Manual page 47

(AVC System)
〈〈NAIN system〉〉 〈In the case of 625i〉
Are HD1 and VD1 are output from pins (9)
and (4) of IC801 (MAIN VIDEO
CHROMA), respectively?
YES
Are HD1 and VD1 are input to pins (28)
and (27) of IC1901 (PLD), respectively?
YES
Are HD3 and VD3 are output from pins (7)
and (6) of IC1901 (PLD), respectively?
YES
Are HD3 and VD3 are input to pins (14)
and (13) of IC604 (Sync. Sep.),
respectively?
YES
Are SP-HD, SP-VD and SP-CP output
from pins (16), (28) and (15) of IC604,
respectively?
YES
Are SP-HD, SP-VD and SP-CP input to
pins (5), (3) and (8) of IC1901,
respectively?
YES
Are PL-HD, PL-VD, PL-CP and PL-BLK
output from pins (30), (29), (31) and (32) of
IC1901, respectively?
YES
Are Hsync, Vsync and SCP input to pin (1),
pins (2) and pin (31) of IC803 (RGB
DECODER), respectively?
YES
Are HS and VS output from pins (29) and
(28) of IC803?
YES
Check the PC I/F unit.
Unstable synchronization
NO
Check IC801 and the peripheral circuit.
NO
Perform checking from pins (9) and (4) of
IC801 to pins (27) and (28) of IC1901.
NO
Check IC1901 and the peripheral circuit.
NO
Perform checking from pins (7) and (6) of
IC1901 to pins (14) and (13) of IC604.
NO
Check IC604 and the peripheral circuit.
Perform checking from pins (16), (28) and
NO
(15) of IC604 to pins (5), (3) and (8) of
IC1901.
NO
Check IC1901 and the peripheral circuit.
Perform checking from pins (30), (29), (31)
NO
and (32) of IC1901 to pins (1), (2) and (31)
of IC803.
NO
Check IC803 and the peripheral circuit.
47
〈〈NAIN system〉〉 〈In the case of 1080i and 720P〉
LC-37AD1E