FUNAI MAGNANOX BZV420MW8 Service Manual page 39

FLOW CHART NO.10
Video E-E does not appear.
Are the video signals inputted to each pin of
IC2805?
IC2805 8PIN VIDEO-IN1 (REAR)
IC2805 10PIN VIDEO-IN2 (FRONT)
Is the video signal ouputtted to Pin(20) of IC2805?
Is the video signal inputted to Pin(30) of IC1301?
Is the C-SYNC signal outputted to Pin(25) of IC1301?
Is the C-SYNC signal inputted to Pin(50) of IC1501?
Yes
Check the line between Pin(25)
of IC1301 and Pin(50) of IC1501,
and service it if defective.
Is the video signal inputted into Pin(1) of IC2101?
Is the video signal outputted to Pin(15) of IC2101?
Continued to C on the next page.
Yes
Yes
Yes
Yes
No
Replace IC1301.
Yes
Yes
1-11-13
Check the line between video input terminal and
No
each pin of IC2805, and service it if defective.
→ JK2804
IC2805 8PIN
→ JK2803
IC2805 10PIN
Are active level of Pin(22,23,24) of IC2805 become
No
as shown below?
INPUT
LINE(REAR)
LINE(FRONT)
Yes
Replace IC2805.
No
Check the line between Pin(20) of IC2805 and
Pin(30) of IC1301, and service it if defective.
Is 5V voltage supplied to Pin(23) of IC1301?
Check the P-ON+5V(2) line and service
Yes
it if defective.
Yes
Is the serial data, clock and chip select signal
supplied to Pin(53, 54, 55) of IC1301?
Check the line between Pin(53,54,55) of IC1301
and Pin(19,20,21) of IC1501, and service it if
defective.
No
Check the line between Pin(26) of IC1301 and
Pin(1) of IC2101, and service it if defective.
No
Is the "H" pulese inputted to Pin(9, 10, 11) of
IC2101?
Yes
Is 5V voltage supplied to
Pin(16) of IC2101?
Is 5V voltage supplied to
Pin(7) of IC2101?
No
Check the AL+5V, AL-5V line, and service it if
defective.
VIDEO-IN1 (REAR)
VIDEO-IN2 (FRONT)
22PIN 23PIN 24PIN
H H L
H L H
No
Check the line between
Pin(22,23,24) of IC2805 and
Pin(57,58,59) of IC1501, and
service it if defective.
No
No
No
No
Replace IC1501.
Yes
Replace IC2101.
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