Sharp LC-37D44EBK (serv.man6) Service Manual ▷ View online
LC-37D44E/S/RU-BK/GY
4 – 9
[External input EXT1,EXT2] No picture on the display (4)
Does not the picture of the CVBS signal input to EXT1 go out?
Does not the picture of the CVBS signal input to EXT2 go out?
Does not the picture of the CVBS signal input to EXT2 go out?
<EXT1>
Is CVBS signal sent to pin (20) of SCART1 (SC1102)?
Is CVBS signal sent to pin (20) of SCART1 (SC1102)?
NO
Check the setting of an external input device that connects of SC1102.
<EXT2>
NO
Check the setting of an external input device that connects of SC1101.
Is CVBS signal sent to pin (20) of SCART2 (SC1101)?
YES
<EXT1>
Is CVBS signal sent to pin (6) of IC1502(SW.)?
Is CVBS signal sent to pin (6) of IC1502(SW.)?
NO
Check the line between SC1102 and IC1502
<EXT2>
Is CVBS signal sent to pin (4) of IC1502(SW.)?
Is CVBS signal sent to pin (4) of IC1502(SW.)?
NO
Check the line between SC1101 and IC1502.
YES
Is CVBS signal output to pin(190) of
IC3001(MAIN_MICON) from pin(2) of IC1502?
IC3001(MAIN_MICON) from pin(2) of IC1502?
NO
Check the line between IC1502 and IC3001.
(SCART12_LINE, etc.)
(SCART12_LINE, etc.)
YES
Refer to “The picture doesn't appear in all modes.”
[External input EXT1,EXT2] No picture on the display (5)
Does not the picture of the R/G/B video signal input to EXT1 go out?
Does not the picture of the R/G/B video signal input to EXT2 go out?
Does not the picture of the R/G/B video signal input to EXT2 go out?
<EXT1>
Is RGB1 signal sent to pins (15)/R1, (11)/G1 and (7)/B1
of SCART1(SC1102)?
Is RGB1 signal sent to pins (15)/R1, (11)/G1 and (7)/B1
of SCART1(SC1102)?
NO
Check the setting of an external input device that connects of SC1102.
<EXT2>
Is RGB2 signal sent to pins (15)/R2, (11)/G2 and (7)/B2
of SCART2(SC1101)?
Is RGB2 signal sent to pins (15)/R2, (11)/G2 and (7)/B2
of SCART2(SC1101)?
NO
Check the setting of an external input device that connects of SC1101.
YES
<EXT1>
Is RGB1 signal sent to pins (187)/R1, (175)/G1 and
(182)/B1 of IC3001(MAIN_MICON)?
Is RGB1 signal sent to pins (187)/R1, (175)/G1 and
(182)/B1 of IC3001(MAIN_MICON)?
NO
Check the line between SC1102 and IC3001.
<EXT2>
Is RGB2 signal sent to pins (178)/R2, (177)/G2 and
(176)/B2 of IC3001(MAIN_MICON)?
Is RGB2 signal sent to pins (178)/R2, (177)/G2 and
(176)/B2 of IC3001(MAIN_MICON)?
NO
Check the line between SC1101 and IC3001.
YES
Refer to “The picture doesn’t appear in all modes.”
LC-37D44E/S/RU-BK/GY
4 – 10
[External input EXT1,EXT2] No picture on the display (6)
Does not the picture of the Y/C video signal input to EXT1 go out?
Does not the picture of the Y/C video signal input to EXT2 go out?
Does not the picture of the Y/C video signal input to EXT2 go out?
<EXT1>
Is Y/C video signal sent to pins (20)/Y and (15)/C of
SCART1 (SC1102)?
Is Y/C video signal sent to pins (20)/Y and (15)/C of
SCART1 (SC1102)?
NO
Check the setting of an external input device that connects of SC1102.
<EXT2>
Is Y/C video signal sent to pins (20)/Y and (15)/C of
SCART2 (SC1101)?
Is Y/C video signal sent to pins (20)/Y and (15)/C of
SCART2 (SC1101)?
NO
Check the setting of an external input device that connects of SC1101.
YES
<EXT1>
Is Y/C signal sent to pins (190)/Y, (187)/C of
IC3001(MAIN_MICON)?
Is Y/C signal sent to pins (190)/Y, (187)/C of
IC3001(MAIN_MICON)?
NO
Check the line between SC1102 and IC3001.
(IC502, SCART12_LINE, etc.)
(IC502, SCART12_LINE, etc.)
<EXT2>
Is Y/C signal sent to pins (190)/Y, (178)/C of
IC3001(MAIN_MICON)?
Is Y/C signal sent to pins (190)/Y, (178)/C of
IC3001(MAIN_MICON)?
NO
Check the line between SC1101 and IC3001.
(IC502, SCART12_LINE, etc.)
(IC502, SCART12_LINE, etc.)
YES
Refer to “The picture doesn’t appear in all modes.”
<When EXT3 is used for external input> No picture on the display (7)
Does not the picture of the composite video signal input to EXT3 go out?
Is CVBS signal output from pin(6) in input terminal
J1002 to pin(10) of connector SC1001?
J1002 to pin(10) of connector SC1001?
NO
Check the line between J1002 and SC1001.
YES
Is the CVBS signal input from pin(10) of connector
P1001 to pin(1) of IC1001(VIDEO SELECTOR)?
P1001 to pin(1) of IC1001(VIDEO SELECTOR)?
NO
Check the line between P1001 and IC1001.
(Connector SC1001/P1001, etc.)
(Connector SC1001/P1001, etc.)
YES
Is CVBS signal output to pin(184) of
IC3001(MAIN_MICON) from pin(7) of IC1001?
IC3001(MAIN_MICON) from pin(7) of IC1001?
NO
Check the line between IC1001 and IC3001.
(SV1JSW_LINE, EXT_DTV_LINE, etc.)
(SV1JSW_LINE, EXT_DTV_LINE, etc.)
YES
Refer to “The picture doesn't appear in all modes.”
LC-37D44E/S/RU-BK/GY
4 – 11
<When EXT3 is used for external input> No picture on the display (8)
Does not the picture of the Y/C video signal input to EXT3 go out?
Is Y/C signal input into pin(14), (12) of connector
SC1001 from pin(3)/Y, (4)/C of J1001?
SC1001 from pin(3)/Y, (4)/C of J1001?
NO
Check the line between J1001 and SC1001.
YES
Is Y/C signal output from pin(14)/Y,(12)/C of connector
P1001?
P1001?
NO
Check the connector SC1001/P1001.
YES
Is the Y/C video signal detection function SV1JSW sig-
nal from pin (6) of the input terminal J1001 normal?
nal from pin (6) of the input terminal J1001 normal?
NO
Check J1001 or peripheral circuits.
YES
Is the SV1JSW signal input to pin(2) of IC1001
(VIDEO_SELECTOR) and pin(27) of IC2302
(SUB_MICON)?
(VIDEO_SELECTOR) and pin(27) of IC2302
(SUB_MICON)?
NO
Check the between SV1JSW_LINE J1001 and IC1001/IC2302. (Con-
nector SC1001/P1001, etc.)
nector SC1001/P1001, etc.)
YES
Is Y/C signal sent to pins (184), (183) of
IC3001(MAIN_MICON)?
IC3001(MAIN_MICON)?
NO
Check the line between P1001 and IC3001.
(IC1001, EXT_DTV_LINE etc.)
(IC1001, EXT_DTV_LINE etc.)
YES
Refer to “The picture doesn't appear in all modes.”
<When EXT4 is used for external input> No picture on the display (9)
Does not the picture of the DVI(ANALOG) video signal input to EXT4(15pin-D-SUB terminal) go out?
Are the video signal and the synchronized signal input
from pin(1, 2, 3)/(R, G, B), (13 and 14)/(V, H) of input
terminal D-SUB (SC1201)?
from pin(1, 2, 3)/(R, G, B), (13 and 14)/(V, H) of input
terminal D-SUB (SC1201)?
NO
Check the connection and setup with the external DVI devices.
YES
Is EDID data pin (6)/SCL, pin(5)/SDA of IC1201
(EEPROM) accessed, and is it read from pin (15),(12)
of a DVI terminal(SC1201)?
(EEPROM) accessed, and is it read from pin (15),(12)
of a DVI terminal(SC1201)?
NO
Is access possible in the re-writing or exchange of EDID data of
IC1201?
IC1201?
YES
NO
Check the circumference circuit of SC1201, IC1201.
Are the video signal and the synchronized signal input
from pin(174, 173, 172)/(R, G, B), pin(171, 47)/(H, V) of
IC3001(MAIN_MICON)?
from pin(174, 173, 172)/(R, G, B), pin(171, 47)/(H, V) of
IC3001(MAIN_MICON)?
NO
Check the line between SC1201 and IC3001.
(IC1941,etc)
(IC1941,etc)
YES
Refer to “The picture doesn't appear in all modes.”
LC-37D44E/S/RU-BK/GY
4 – 12
<When EXT5 is used for external input> No picture on the display (10)
Does not the picture of the component video signal input to EXT5 go out?
Is COMPONENT video signal input into pin(3)/Y, (5)/Pb,
(7)/Pr of the input terminal J1401?
(7)/Pr of the input terminal J1401?
NO
Check the connection of J1401 and the external input device.
YES
Is COMPONENT video signal input into pin(1)/Y, (6)/Pb,
(9)/Pr of IC1401(VIDEO_BUFFER)?
(9)/Pr of IC1401(VIDEO_BUFFER)?
NO
Check the line between J1401 and IC1401.
YES
Is COMPONENT signal output into pin(180), (179),
(181) of IC3001(MAIN_MICON) from pin(20)/Y, (18)/PB,
(16)/PR of IC1401?
(181) of IC3001(MAIN_MICON) from pin(20)/Y, (18)/PB,
(16)/PR of IC1401?
NO
Check the line between IC1401 and IC3001.
YES
Refer to “The picture doesn't appear in all modes”
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