FUNAI DRVR-B778S - Page 42

1-11-18 E9G01TR
Ye s
"F"
Check the line between Pin(21,25) of IC1518 and
audio terminal (JK1502), and service it if defective.
Are the audio signals outputted to the specific
output terminal?
Are the audio signals outputted to the audio
terminal (JK1502)?
Are the audio signals outputted to the audio
terminal (JK2001)?
Ye s
IC1518 21,25PIN AUDIO-OUT 1 (AV1)
IC1518 22,26PIN AUDIO-OUT 2 (AV2)
Are the audio signals outputted to each pin
of IC1518?
No
No
Check the line between Pin(22,26) of IC1518 and
audio terminal (JK2001), and service it if defective.
No
Check the AL+12V(1) line
and service it if defective.
Replace IC1518.
Ye s
No
Is 12V voltage supplied to Pin(2,4) of IC1518?
Check the line between Pin(3,13) of IC1501 and
Pin(4,50) of IC451, and service it if defective.
Check the circuit of AL+5V(1), P-ON+5V and
P-ON+9V, and service it if defective.
Is the 5V voltage supplied to Pin(16,32,35,36,46,55) of
IC451, or the 9V voltage supplied to Pin(69) of IC451?
Is the serial data and the clock signal supplied to
Pin(37,38) of IC451?
Is the audio signal outputted to Pin(74,76)
of IC451?
Is the audio signal inputted into Pin(2,12) of
IC1508?
Is the audio signal outputted to Pin(14,15) of
IC1508?
Is the audio signal supplied to Pin(4,50) of IC451?
Ye s
Ye s
Ye s
Ye s
Ye s
Ye s
No
No
No
No
No
No
No
Check the line between Pin(37,38) of IC451 and
Pin(71,72) of IC501, and service it if defective.
Check the line between Pin(53) of IC451 and
Pin(28) of IC501, and service it if defective.
Check the line between Pin(74,76) of IC451 and
Pin(2,12) of IC1508, and service it if defective.
Is the audio signal inputted into Pin(6,12) of
IC1518?
Ye s
No
Check the line between Pin(14,15) of IC1508 and
Pin(6,12) of IC1518, and service it if defective.
Replace IC451.
Is the "L" pulse inputted into the Pin(53) of IC451?
Check the AL+5V(1) and
AL-5V line, and service it if
defective.
Replace IC1508.
Ye s N o
Is 5V voltage supplied to Pin(16) of IC1508?
Is -5V voltage supplied to Pin(7) of IC1508?