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32LD333H (CHASSIS:LA06H) - LG TV Service Manual (repair manual). Page 42

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Check TU5001 Pin11(Video output)
Can you see the normal signal?
Check tuner 5V power L5002 
YES
NO
Could you measure voltage of TU5001 & 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 IC401
Analog RF Video Trouble shooting guide
YES
YES
Check tuner 3.3V power L5003 
Replace L5003
NO
Replace IC401
Replace L5002
YES
NO
Check tuner 1.2V power IC5001
2pin : 1.2V 
Replace IC5001
NO
Check RF cable & signal
YES
NO
Replace 
Mstar(IC101) or 
main board
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