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50PG4000-ZA (CHASSIS:PD81A) - LG TV Service Manual (repair manual). Page 19

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(5) In the case of becomes unusual display from Component, RGB mode
(6) In the case of becomes unusual display from HDMI mode
(7) In the case of becomes unusual display from SCART mode
Is R,G,B input and H,V Sync of the JK701, 703  normal?
1. Check the RGB signal/H(V)SYNC in the RGB Cable
Yes
Check the input source of Equipment
Same as Block A
No
Is Video input of A/V jack normal?
Yes
Check the input source.
Same as Block A
No
No
Is the HDMI(IC201)
normal?
Yes
Same as Block A
Is the TMDS waveform between the
IC and HDMI jacks normal?
Replace the IC201.
No
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