Daewoo DUA-3291GB Service Manual page 14

Trouble Shooting Charts
(3)External AV Mode
Check
External Connection
Check Signal
#50,#52~#53, #56~#59
of I501
Check Signal
#16~#18 of I501
Check
#6~#8 of I901
Check/Replace
Q902~Q904
Video, Heater voltage Line
Check/Replace
CRT Board
Check
External equipment
Check/Replace
I501
Check/Replace
Q502~Q504
And 5V Line
14
Normal
Abnormal