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42LG70YR (CHASSIS:LP81D) - LG TV Service Manual (repair manual). Page 16

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- 16 -
1) Check process
3. Unusual display from RF mode.
No
Yes
Yes
No
No
Is Video output of the
Tuner normal?
(Check TU500_Pin13)
Is the
Input voltage normal?
(Check Pin3)
Block A
Is the I2C communication normal?
(Check Pin9, Pin10)
No
Yes
Is the LVDS
cable connected well?
Change the IC(IC801)
Check the power
Cable inserts well
Check the Tuner
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