Read LG 55LS675H (CHASSIS:LA2AG) Service Manual online
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2. No OSD Trouble Shooting guide
3. Analog RF Video Trouble shooting guide
Check LVDS Cable
Check LCD Module
Control board
Y
Replace Cable
N
Check P401 All
Voltage Level (5V, 12V, 24V)
Check power connector and
RL_ON(pin1) signal OK ?
Replace Power board
N
Y
Check Q409 output Voltage(12V)
Y
Check Q409 application circuit or
replace Q409
N
Check TU3001 Pin7(Video output)
Can you see the normal signal?
Check tuner 5V power L3000
YES
NO
Could you measure voltage of TU3001 & IIC lines?
Are they all normal?
Check Mstar LVDS output
NO
You should check power line
& IIC lines.
YES
You should replace TUNER.
NO
Check IC5000
YES
YES
Check tuner 3.3V power L3001
Replace L3001
NO
Replace IC5000
Replace L3000
YES
NO
Check tuner 1.2V power IC3000
2pin : 1.2V
Replace IC3000
NO
Check RF cable & signal
YES
NO
Replace Mstar(IC101)
or main board
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