Magnavox DV225MG9 Service Manual page 31

FLOW CHART NO.10
Video E-E does not appear.
Is the Video signal inputted to Pin(28,30) of IC301?
Yes
Is the C-SYNC signal outputted to Pin(25) of IC301?
Is the C-SYNC signal inputted to Pin(41) of IC501?
Yes
Check the line between Pin(25)
of IC301 and Pin(41) of IC501,
and service it if defective.
Is the video signal inputted into Pin(1) of IC752?
Is the video signal outputted to Pin(15) of IC752?
Is the video signal outputted to Pin(15) of IC751?
Check the line between Pin(15) of IC751 and video
output terminal (JK751), and service it if defective.
Yes
No
Replace IC301.
Yes
Yes
Yes
No
Check the line between the video input
terminal (rear) and Pin(28) of IC301, and
service it if defective.
Check the line between the video input
terminal (front) and Pin(30) of IC301, and
service it if defective.
Is 5V voltage supplied to Pin(23) of IC301?
Check the P-ON+5V line and service it
if defective.
Yes
Is the serial data, clock and chip select signal
supplied to Pin(53, 54, 55) of IC301?
Yes
Check the line between Pin(53,54,55) of IC301
and Pin(14,15,16) of IC501, and service it if
defective.
No
Check the line between Pin(26) of IC301 and
Pin(1) of IC752, and service it if defective.
No
Is approximately 5V voltage supplied to Pin(16)
of IC752, and approximately -5V voltage supplied
to Pin(7) of IC752?
Is the "H" pulse inputted into Pin(9,10,11)
of IC752?
Yes
Replace IC752.
Check the AL+5V line and the
AL-30V line (R777,D777), and service it if defective.
No
Is approximately 5V voltage supplied to Pin(16)
of IC751, and approximately -5V voltage supplied
to Pin(7) of IC751?
Is the "H" pulse inputted into Pin(9,10,11)
of IC751?
Yes
Replace IC751.
Check the AL+5V line and the
AL-30V line (R777,D777), and service it if defective.
1-10-10
No
No
No
Yes
No
Replace IC501.
Yes
No
No
Replace IC501.
E8E62TR
No