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42LY99-ZC (CHASSIS:LD75C) - LG TV Service Manual (repair manual). Page 18

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(4) In the case of becomes unusual display from side S-video/AV mode
Is Videoinput
of the AVJack(P1400)
normal?
Check the input source.
Are the Input voltage, IIC Communication
and HV sync normal?
Yes
No
No
Replace the IC.
No
Replace the IC.
No
Is the CXA2069Q
normal?
Yes
Same as Block A.
(5) In the case of becomes unusual display from Component, RGB mode
Are the
R,G,B input and
H,V Sync of the J1100
normal?
Yes
Check the input source.
No
Same as Block A.
(6) In the case of becomes unusual display from HDMI mode
Is the
HDMI002 (IC1004)
normal?
Yes
Is the Input voltage, IIC Communication
and HV sync normal?
No
Same as Block A.
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