LG 65UX970H Service Manual page 31

6. HDMI Video Trouble Shooting guide
Check input signal format.
Is it supported?
Y
Check AC cable for damage
For damage or open conductor
Y
Check JK3300/JK3301/JK3302
Can you see the normal waveform?
Y
This board has big problem because Main chip (LM15U) have some troubles.
After checking thoroughly all path once again, You should decide to replace LM15U or not.
7. Analog RF Audio Trouble Shooting guide
Check RF Cable & Signal
Y
Check TU6700 Pin2 (SIF Output)
Can you see the normal signal?
Y
Check Audio AMP output
L5802,L5803,L5804,L5805
Y
Check IC5800
Y
After checking audio signal line,
you should decide to replace item or not.
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Only for training and service purposes
N
You should replace TUNER.
Y
Could you measure voltage of
N
TU6700& IIC lines?
Are they all normal?
N
Replace L5802,L5803,L5804,L5805
N
Replace IC5800
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JK3300/JK3301/JK3302 may have problem.
Replace this Jack.
You should check power line & IIC
N
lines.
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