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DV-NC100H. Cover, Contents, , Laser beam safety precautions, Important safeguards and precautions, Standard notes for servicing, Preparation for servicing, Operating controls and functions, Cabinet disassembly instructions, Electrical adjustment instructions, Firmware renewal mode, Troubleshooting, Block diagrams, Function indicator symbols, Main Schematic diagram 1 9. - Sharp DVD Service Manual (repair manual). Page 33

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1-10-11
H9741TS
FLOW CHART NO.10
Video E-E does not appear.
Is the Video signal inputted to Pins(48,50,52,54) of 
IC301?
1) In the external input mode
2) In the U/V tuner mode
Check the line between Pin(20) of JK101 (Scart
jack) and Pin(50) of IC301, and service it if 
defective.
Check the line between Pin(20) of JK1402 
(Scart jack) and Pin(52) of IC301, and service it 
if defective.
Check the line between the video input 
terminal (front) and Pin(54) of IC301, and 
service it if defective.
Check the line between Pin(24) of the U/V tuner 
and Pin(48) of IC301, and service it if defective.
Yes
Yes
Yes
No
Yes
Yes
Yes
No
Yes
No
No
No
No
No
Is the C-SYNC signal outputted to Pin(67) of IC301?
Is the C-SYNC signal inputted to Pin(58) of IC501?
Is the video signal outputted to Pin(4) of IC751?
Is the "L" pulse inputted into Pin(9,10,11) of IC751?
Yes
Replace IC751.
Replace IC501.
Is approximately 5V voltage supplied to Pin(16) 
of IC751, or approximately -5V voltage supplied to 
Pin(7) of IC751?
No
Check the AL+5V line and the AL-30V line 
(R764, R765), and service it if defective.
Check the line between Pin(67) 
of IC301 and Pin(58) of IC501, 
and service it if defective.
Check the line between Pin(4) of IC751 
and Q104, and service it if defective.
Check the line between Pin(61) of IC301 and 
Pin(5) of IC751, and service it if defective.
When only Line signal is not outputted...
check the line between the emitter of Q104 and 
Pin(19) of JK101 (Scart jack), and service it if 
defective.
When only RF signal is not outputted...
check the tuner (TU701), and the line between 
the emitter of Q104 and Pin(6) of the tuner, 
and service it if defective.
Is the video signal inputted into Pin(5) of IC751?
Is the video signal outputted to the emitter of Q104?
Replace IC301.
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