Sharp LC-20AV7U Service Manual - Page 25

Video Signal

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2. VIDEO SIGNAL SECTION FLOW CHART NO.22 Picture does not appear normally. (Tuner input (Analog)/ Video input/S-Video input) Are the video signals inputted to the specific input terminal? Are the luminance signals inputted to the No Pin(76) of IC1202? Are the chrominance signals inputted to the No Pin(57) of IC1202? Are the component video signals inputted to the No Pin(71) of IC1202? Are the component video signals inputted to the No Pin(67) of IC1202? Yes Replace IC1202 or LCD MODULE. FLOW CHART NO.23 Picture does not appear normally. (Tuner input (Digital)) Are the DIF signals outputted to the Pins(11, 12) of CN62? No Yes Are the video signals outputted to the specific output terminal? Are the Y signals outputted to the Pin(18) of CN62? Are the Pb signals outputted to the Pin(20) of No CN62? Are the Pr signals outputted to the Pin(19) of CN62? Yes Are the video signals inputted to the specific input terminal? Are the Y signals inputted to the Pin(73) of No IC1202? Are the Pb signals inputted to the Pin(54) of No IC1202? Are the Pr signals inputted to the Pin(64) of No IC1202? Yes Replace IC1202 or LCD MODULE. FLOW CHART NO.24 Picture does not appear normally. (Y / Pb / Pr input) Check the line between each pin of IC1202 and input terminal and service it if defective. Check the line between Pin(76) of IC1202 and JK701, and service it if defective. Check the line between Pin(57) of IC1202 and JK701, and service it if defective. Check the line between Pin(71) of IC1202 and JK703, and service it if defective. Check the line between Pin(67) of IC1202 and TU61, and service it if defective. Check the line between Pin(11, 12) of CN62 and TU61, and service it if defective. Replace DTV MODULE CBA UNIT. Check the line between Pin(73) of IC1202 and Pin(18) of CN62, and service it if defective. Check the line between Pin(54) of IC1202 and Pin(20) of CN62, and service it if defective. Check the line between Pin(64) of IC1202 and Pin(19) of CN62, and service it if defective. Are the video signals outputted to the specific input terminal? Are the Y signals outputted to the Pin(75) of IC1202? Are the Pb signals outputted to the Pin(56) of IC1202? Are the Pr signals outputted to the Pin(66) of IC1202? Yes Replace IC1202 or LCD MODULE. Check the line between each input terminal and IC1202 and service it if defective. No Check the line between JK706 and Pin(75) of IC1202 , and service it if defective. No Check the line between JK707 and Pin(56) of IC1202 , and service it if defective. No Check the line between JK708 and Pin(66) of IC1202 , and service it if defective. 7-8 A7144_45TS

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7-8
A7144_45TS
2.
VIDEO SIGNAL SECTION
Picture does not appear normally. (Tuner input (Analog)/ Video input/S-Video input)
Are the video signals inputted to the specific
input terminal?
Are the luminance signals inputted to the
Pin(76) of IC1202?
Check the line between Pin(76) of IC1202 and JK701,
and service it if defective.
Check the line between Pin(57) of IC1202 and JK701,
and service it if defective.
Check the line between Pin(71) of IC1202 and JK703,
and service it if defective.
Check the line between Pin(67) of IC1202 and TU61,
and service it if defective.
Check the line between each pin of IC1202 and input
terminal and service it if defective.
No
No
No
No
Yes
Are the chrominance signals inputted to the
Pin(57) of IC1202?
Are the component video signals inputted to the
Pin(71) of IC1202?
Are the component video signals inputted to the
Pin(67) of IC1202?
Check the line between Pin(11, 12) of CN62 and
TU61, and service it if defective.
Replace DTV MODULE CBA UNIT.
Replace IC1202 or LCD MODULE.
Yes
No
No
No
Check the line between Pin(73) of IC1202 and
Pin(18) of CN62, and service it if defective.
Check the line between Pin(54) of IC1202 and
Pin(20) of CN62, and service it if defective.
Check the line between Pin(64) of IC1202 and
Pin(19) of CN62, and service it if defective.
Are the Y signals inputted to the Pin(73) of
IC1202?
Are the Pb signals inputted to the Pin(54) of
IC1202?
Are the Pr signals inputted to the Pin(64) of
IC1202?
Are the video signals inputted to the specific
input terminal?
FLOW CHART NO.22
Are the video signals outputted to the specific
output terminal?
Are the DIF signals outputted to the Pins(11, 12) of CN62?
Are the Y signals outputted to the Pin(18) of
CN62?
No
Yes
Are the Pb signals outputted to the Pin(20) of
CN62?
Are the Pr signals outputted to the Pin(19) of
CN62?
No
Replace IC1202 or LCD MODULE.
Picture does not appear normally. (Tuner input (Digital))
FLOW CHART NO.23
Yes
No
No
No
Yes
Replace IC1202 or LCD MODULE.
Check the line between JK706 and Pin(75)
of IC1202 , and service it if defective.
Check the line between JK707 and Pin(56)
of IC1202 , and service it if defective.
Check the line between JK708 and Pin(66)
of IC1202 , and service it if defective.
Check the line between each input terminal and
IC1202 and service it if defective.
Are the Y signals outputted to the Pin(75) of
IC1202?
Are the Pb signals outputted to the Pin(56) of
IC1202?
Are the Pr signals outputted to the Pin(66) of
IC1202?
Are the video signals outputted to the specific
input terminal?
Picture does not appear normally. (Y / Pb / Pr input)
FLOW CHART NO.24