Samsung DVD-R157 Service Manual page 30

Trouble Shooting
AV1 CVBS Video Input Error
Has about p-p 1V level?
Has about p-p 1V signal?
A
5-6
Pin 13 In IC801
Yes
Pin 5 In IC801
Yes
Check Pin21,22
in IC801 of input
SDL/SDA Data
Yes
Pin 7 in IC801
has about p-p 1V
Signal?
Yes
Pin 25 in IC801
has about p-p 1V
Signal?
Yes
No problem
No
Check the connection between
Pin 13 in IC801 and L1 Pin-Jack.
No Check Pin 24, 29 in IC801
of input power(5V).
Check the connection between Pin 21 and
No
Pin 22 in IC801 and Pin 17 and 18 in IC601.
No
Check DVD Main PCB
No
Check the IC801
CVBS_IN(Pin38 of Main VIC1)
Samsung Electronics