Read Sharp LC-37AD1E (serv.man9) Service Manual online
45
LC-37AD1E
NO
NO
NO
YES
YES
Unstable synchronization
Check the PC I/F unit.
Are HD1 and VD1 are output from pins (9)
and (4) of IC801 (MAIN VIDEO
CHROMA), respectively?
and (4) of IC801 (MAIN VIDEO
CHROMA), respectively?
Check IC801 and the peripheral circuit.
Are HD1 and VD1 are input to pins (28)
and (27) of IC1901 (PLD), respectively?
and (27) of IC1901 (PLD), respectively?
Perform checking from pins (9) and (4) of
IC801 to pins (27) and (28) of IC1901.
IC801 to pins (27) and (28) of IC1901.
Are HD3 and VD3 are output from pins (7)
and (6) of IC1901 (PLD), respectively?
and (6) of IC1901 (PLD), respectively?
Check IC1901 and the peripheral circuit.
NO
NO
YES
Are HD3 and VD3 are input to pins (14)
and (13) of IC604 (Sync. Sep.),
respectively?
and (13) of IC604 (Sync. Sep.),
respectively?
Perform checking from pins (7) and (6) of
IC1901 to pins (14) and (13) of IC604.
IC1901 to pins (14) and (13) of IC604.
NO
NO
YES
YES
Are SP-HD, SP-VD and SP-CP input to
pins (5), (3) and (8) of IC1901,
respectively?
pins (5), (3) and (8) of IC1901,
respectively?
Perform checking from pins (16), (28) and
(15) of IC604 to pins (5), (3) and (8) of
IC1901.
(15) of IC604 to pins (5), (3) and (8) of
IC1901.
Are PL-HD, PL-VD, PL-CP and PL-BLK
output from pins (30), (29), (31) and (32) of
IC1901, respectively?
output from pins (30), (29), (31) and (32) of
IC1901, respectively?
Check IC1901 and the peripheral circuit.
NO
YES
Are Hsync, Vsync and SCP input to pin (1),
pins (2) and pin (31) of IC803 (RGB
DECODER), respectively?
pins (2) and pin (31) of IC803 (RGB
DECODER), respectively?
Perform checking from pins (30), (29), (31)
and (32) of IC1901 to pins (1), (2) and (31)
of IC803.
and (32) of IC1901 to pins (1), (2) and (31)
of IC803.
NO
YES
YES
Are HS and VS output from pins (29) and
(28) of IC803?
(28) of IC803?
Check IC803 and the peripheral circuit.
Are SP-HD, SP-VD and SP-CP output
from pins (16), (28) and (15) of IC604,
respectively?
from pins (16), (28) and (15) of IC604,
respectively?
Check IC604 and the peripheral circuit.
YES
(AVC System)
〈〈
NAIN system
〉〉
〈
In the case of 625i
〉
〈〈
NAIN system
〉〉 〈
In the case of 1080i and 720P
〉
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