42LB1R (CHASSIS:LP7BA) - LG TV Service Manual (repair manual). Page 21

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13. In case of becomes unusual display
 from RF mode(Sub)
Is normal video output
of the 
T
uner?
(Check T
U
201
_Pin1
4)
Is normal the I2C communication ?
(Check  Pin5, 
Pin4)
Is normal video
 output 
of CXA2069Q?
(Check R3
12, In case of  S-Video
check R312, R314)
Is the 
T
uner Cable
connected w
e
ll?
Is normal the Input voltage ?
(Check  Pin8, 
Pin6)
Is normal the Input voltage ?
(Check L3
08)
Is normal the 
I2C communication ?
(Check  R309, R310)
Change the IC(
IC300)
Check the po
wer
( Check L10
04
)
Change the IC(
IC700)
Is the LVDS Cable
connected w
e
ll?
Cabl
e inserts 
w
e
ll
Change the T
uner
Check the po
wer
( L1103)
Cabl
e inserts 
w
e
ll.
B
NO
NO
NO
NO
NO
NO
NO
YE
S
YE
S
YE
S
YE
S
Y
E
S
YE
S
Y
E
S
14. In case PIP d
o
esn’t  d
isplay from other modes(Sub)
Sa
me
 as the 
case 
of main 
exc
e
p
t  block A
 should  be 
change to B
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