Read Sharp LC-37AD1E (serv.man9) Service Manual online
44
LC-37AD1E
YES
Check PC I/F Unit
YES
Are the R, G and B MAIN signals output to
TP816, TP815 and TP814, respectively?
YES
Are the R, G and B MAIN signals input to pins (25), (1)
and (5) of FL810 (30/6.7MHz L.P.F.), respectively?
Is pin (21) of FL810 (30/6.7MHz L.P.F.) set to
"H"? Check the peripheral circuitry of FL810.
Perform checking from IC803 to FL810. (Q801-
803, etc.)
No external input picture comes out.
〈〈
INPUT1 SCART
〉〉
Perform checking from pins (7), (11)
and (15) of SC1101 to pins (59), (61)
and (63) of IC1401.
Is INPUT1 selected on the input change menu screen?
Select an input signal on the input signal source menu
screen.
YES
YES
NO
(AVC System)
〈〈
MAIN system
〉〉
〈〈
SUB system
〉〉
Is the signal input to each input terminal of
IC1401 (AV SWITCH)?
Are the G1, B1 and R1 signals input to pins
(59), (61) and (63), respectively?
Perform checking from pins (50), (48) and (46)
of IC1401 to pins (26) and (19), pins (25) and
(18) and pins (27) and (17) of IC801.
YES
YES
NO
Are the COMP_Y, CB and CR signals input to pins
(26) and (19), pins (25) and (18) and pins (27) and (17)
of IC801 (MAIN _VIDEO_CHROMA), respectively?
〈〈
PASS system
〉〉
Perform checking from pins (38), (36) and
(34) of IC1401 to pin (5) and (47), pins (4)
and (48) and pins (3) and (46) of IC803.
YES
YES
NO
Are the COMP3_Y, CB and CR signals input to pins
(5) and (47), pins (4) and (48) and pins (3) and (46)
of IC803 (RGB DECODER), respectively?
Check IC801 (MAIN VIDEO CHROMA)
and the peripheral circuitry.
YES
NO
Are the Y, Cb and Cr MAIN signals output to
pins (21), (22) and (23) of IC801, respectively?
Perform checking from pins (44), (42)
and (40) of IC1401 to pins (21), (24)
and (18) of SC1550.
YES
YES
NO
Are the COMP2_Y, CB and CR signals output
to pins (21), (24) and (18) of SC1550,
respectively?
NO
Check IC1401 (AV SWITCH) and the peripheral
circuitry.
Check PC I/F Unit
Perform checking from IC801 to IC803.
YES
NO
NO
NO
NO
Are the Y, Cb and Cr MAIN signals input to pins
(11) and (69), pins (10) and (68) and pins (9) and
(67) of IC803 (RGB DECODER), respectively?
Are the R, G and B MAIN signals output to pins (35), (37) and (39) of IC803, respectively?
Check IC803 (RGB DECODER) and the peripheral circuitry.
No external input picture comes out.
〈〈
INPUT3 SCART
〉〉
Are the G3, B3 and R3 signals input to pins (5), (7) and (9) of IC1401 (AV SWITCH), respectively?
Perform checking from pins (3), (5) and (6) of IC1401 to pins (5), (7) and (9) of IC1401.
Perform checking from pins (26), (32)
and (36) of SC1102 to pins (1), (14)
and (9) of IC2508.
Is INPUT3 selected on the input change menu screen?
Select an input signal on the input signal source menu
screen.
YES
YES
YES
NO
NO
Is the signal input to each input terminal of
IC2508 (COMPONENT_SEL)?
Are the G3, B3 and R3 signals input to pins (1),
(14) and (9), respectively?
No external input picture comes out.
〈〈
INPUT3 Y/Pb(Cr)/Pr(Cr)
〉〉
Perform checking from pins (3), (8)
and (12) of J1101 to pins (16), (11)
and (8) of IC2508.
Is INPUT3 selected on the input change menu screen?
Select an input signal on the input signal source menu
screen.
YES
YES
NO
Is the signal input to each input terminal of
IC2508 (COMPONENT_SEL)?
Are the Y, Pb and Pr signals input to pins (16),
(11) and (8), respectively?
No TUNER (DTV) picture comes out.
Perform checking from pins (19), (17)
and (15) of P2503 to pins (19), (17)
and (15) of IC1401.
Is DTV selected on the input change menu screen?
YES
YES
NO
Is the signal input to each input terminal of
IC1401 (AV SWITCH)?
Are the D_B, D_G and D_R signals input to
pins (19), (17) and (15), respectively?
Are the MAIN, PASS and SUB video signals output to pins (50), (48) and (46), pins (38), (36) and (34) and pins (44), (42) and (
40) of IC1401, respectively?
No picture comes out at the time of external input. (Pictures come out at the time of TV broadcast receiving.)
<At the time of RGB/COMPONENT video signal input>
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