Sharp Aquos LC 37HV6U, Service Manual

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45
LC-37HV6U
NO NO NO NO NO NO NO NO
YES
YES YES YES YES YES YES YES
No picture comes out at the time of external input. (Pictures come out at the time of TV broadcast receiving.) <At the time of CVBS video signal and S video signal input>
No external input picture comes out. <<INPUT 1 to 4>>
Is the desired INPUT mode selected on input change menu screen?
Select an input signal on the input signal source menu screen.
<At the time of CVBS video signal input> Is the video signal inputted to pin (93) of IC7001 (MAIN Y/C SEPARATOR)?
Perform checking from IC1301 to IC7001.
Are the Y, Cb and Cr MAIN signals inputted to pins (69), (68) and (67) of IC803 (RGB DECODER)?
Perform checking from IC801 to IC803. (Q842-4, IC813, IC814, Q814~816, etc.)
Are the Y, Cb and Cr MAIN signals outputted to pins (21), (22) and (23) of IC801?
Check IC801 (MAIN VIDEO CHROMA) and the peripheral circuitry.
Are the R, G and B MAIN signals outputted to pins (35), (37) and (39) of IC803?
Check IC803 (RGB DECODER) and the peripheral circuitry.
Are the R, G and B MAIN signals inputted to pins (25), (1) and (5) of FL810 (30/6.7MHz L.P.F.)?
Perform checking from IC803 to FL810. (Q801-3, etc.)
Are the R, G and B MAIN signals outputted to pins (17), (14) and (11) of FL810?
Check PC I/F unit.
Cutoff frequency setting terminal (pin (21) of FL810 (6.7/30MHz L.P.F.))
〈〈
525i
〉〉
: L
〈〈
525P, 1125i and 750P
〉〉
: H
<At the time of CVBS video signal input> Are the MAIN-Y and MAIN-C signals inputted to pins (41) and (39) of IC801 (MAIN VIDEO CHROMA), respectively? <At the time of Y/C video signal input> Are the MAIN-Y and MAIN-C signals inputted to pins (44) and (43) of IC801 (MAIN VIDEO CHROMA), respectively?
<At the time of CVBS video signal input> Perform checking from IC1301 to IC801. (Q7007, Q7008, IC7001, IC7003, Q7005, Q7006, FL7004, FL7005, etc.) <At the time of Y/C video signal input> Perform checking from IC1301 to IC801. (Q403, Q404, etc.)
NO NO NO
YES
NO
YES YES YES YES YES YES YES YES
No TUNER (U/V) picture comes out.
Is the video signal outputted to the tuner (TU1101/1102) output terminal (pin (17))? Is the video signal inputted to pins (7) and (1) of IC1104 (LEVEL ADJ)?
Check IC1301 (AV SWITCH) and the peripheral circuitry.
Check or replace the peripheral circuitry of the tuner (TU1101/1102).
Is the video signal outputted to pins (5) and (3) of IC1104 (LEVEL ADJ)?
Is the control signal for level adjustment inputted from pins (1) and (2) of IC1105 to pins (6) and (2) of IC1104 (LEVEL ADJ)?
Is the tuner video input to IC1103 (AV SWITCH) normal? Pin (63) of IC1301 (MAIN TUNER IN) Pin (60) of IC1301 (SUB TUNER IN)
Check or replace the peripheral circuitry of IC1105 (2CH_DA_CONV).
AVC System
<At the time of CVBS video signal input> Is the CVBS video signal outputted to pin (56) of IC1301? <At the time of Y/C video signal input> Are the MAIN-Y, MAIN-C, SUB-Y and SUB-C signals outputted to pins (56), (58), (44) and
(47) of IC1301, respectively?
Is the signal inputted to each input terminal of IC1301 (AV SWITCH)? <CVBS video signal input>
〈〈
Input 1
〉〉
Is the signal inputted to pin (1)?
→
Perform checking from pin (4) of J1103 to pin (1) of IC1301.
〈〈
Input 2
〉〉
Is the signal inputted to pin (8)?
→
Perform checking from pin (1) of J1103 to pin (8) of IC1301.
〈〈
Input 3
〉〉
Is the signal inputted to pin (15)?
→
Perform checking from pin (4) of J1104 to pin (15) of IC1301.
〈〈
Input 4
〉〉
Is the signal inputted to pin (22)?
→
Perform checking from pin (2) of J2404 to pin (22) of IC1301.
<S video signal input>
〈〈
Input 1
〉〉
Are the Y and C signals inputted to pins (3) and (5), respectively?
→
Perform checking from pins (9) and (10) of
SC1101 to pins (3) and (5) of IC1301.
〈〈
Input 2
〉〉
Are the Y and C signals inputted to pins (10) and (12), respectively?
→
Perform checking from pins (3) and (4) of
SC1101 to pins (10) and (12) of IC1301.
〈〈
Input 3
〉〉
Are the Y and C signals inputted to pins (17) and (19), respectively?
→
Perform checking from pins (9) and (10) of
SC1102 to pins (17) and (19) of IC1301.
〈〈
Input 4
〉〉
Are the Y and C signals inputted to pins (24) and (26), respectively?
→
Perform checking from pins (3) and (4) of
J2401 to pins (24) and (26) of IC1301.
〈〈
MAIN system
〉〉
NO NO NO NO NO NO
<At the time of CVBS video signal input> Is the video signal inputted to pin (7) of IC402 (SUB COMB SEPARATOR)?
Perform checking from IC1301 to IC402.
Are Y, Cb and Cr SUB signals inputted to 6.7MHz L.P.F. composed of Q901-6?
Perform checking from IC802 to Q901-6.
Are the Y, Cb and Cr MAIN signals outputted to pins (21), (22) and (23) of IC802?
Check IC802 (SUB VIDEO CHROMA) and the peripheral circuitry.
Are Y, Cb and Cr SUB signals outputted from 6.7MHz L.P.F. composed of Q901-6?
Check Q901-6 (6.7MHz L.P.F.) and the peripheral circuitry.
Check PC I/F unit.
<At the time of CVBS video signal input> Are the MAIN-Y and MAIN-C signals inputted to pins (1) and (48) of IC802 (SUB VIDEO CHROMA), respectively? <At the time of Y/C video signal input> A
re the MAIN-Y and MAIN-C signals inputted to pins (5)
and (7) of IC802 (SUB VIDEO CHROMA), respectively?
<At the time of CVBS video signal input> Perform checking from IC1301 to IC802. (Q407, Q408, IC402, IC404, Q416, Q417, Q418, etc.) <At the time of Y/C video signal input> Perform checking from IC1301 to IC802. (Q409, Q410, etc.)
〈〈
SUB system
〉〉