LG 65UX970H Service Manual page 28

2. No OSD Trouble Shooting guide
Check P2300/1 Voltage Level
(3.5V, L2301)
(12V, L2302)
(24V, L2307/8)
Check IC2309 output
Voltage(12V)
Pin 8
Y
Check LVDS Cable
Y
Check LCD Module
Control board
3. Analog RF Video Trouble Shooting guide
Check RF cable & signal
YES
Check TU6700 Pin5(Video output)
Can you see the normal signal?
YES
Check tuner 5V power L6701
YES
Check tuner 3.3V power L6700
Check tuner 1.8V power L6707
YES
Check Mstar LVDS output
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Only for training and service purposes
Check power connector and
N
RL_ON(pin1) signal OK ?
Check IC2309 application circuit
N
or replace IC2309
N
Replace Cable
NO
Could you measure voltage of TU6700 & IIC lines?
Are they all normal?
You should replace TUNER.
NO
Check IC2305
YES
NO
Replace L6700
NO
Replace L6707 or IC6700
NO
Replace Main IC(IC101) or
main board
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Y
YES
NO
Replace IC2305
Replace L6701
Replace Power board
NO
You should check power line
& IIC lines.
LGE Internal Use Only