Read LG 26LT673H (CHASSIS:LA2AM) Service Manual online
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Analog RF Video Trouble Shooting guide
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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