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3. Analog RF Video Trouble Shooting guide
Check TU3001 Pin7(Video output)
Can you see the n ormal signal?
Check tuner 5V power L3000
YES
NO
Could you measure voltage of TU3001 & IIC lines?
Are th ey all n ormal?
Check Mstar LVDS output
NO
You sh ould check power line
& IIC lines.
YES
You sh ould replace TUNER.
NO
Check IC5000
YES
YES
Check tuner 3.3V po wer L3001 Rep lace L3001
NO
Replace IC5000
Replace L3000
YES
NO
Check tuner 1.8V po wer L3003
Replace IC3000 or IC3000
NO
Check RF cable & signal
YES
NO
Replace Mstar(IC101)
or main board
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