32LG700H (CHASSIS:LA80A) - LG TV Service Manual (repair manual). Page 16

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Check TU1001 Pin16(Video output)
Can you see the normal signal?

Check the input(Pin1) of LPF(IC1000).
Can you see the normal waveform?

YES

NO

Could you measure voltage of TU1001 & IIC lines?
Are they all normal?

Check the output(Pin8) of LPF(IC1000).
Can you see the normal waveform?

Check the input(PinAN16) of BCM3563(IC101).
Measure waveform at C626 because it

’ s more easy to check.

Can you see the normal waveform?

NO

You should check power line
& IIC lines.

YES

You should replace TUNER.

NO

After checking video signal line & the Power of LPF you should decide
to replace item or not.

NO

After checking the Power of LPF you should decide to replace LPF  or not.

YES

This board has big problem because Main chip(BCM3563) have some troubles.
After checking thoroughly all path once again, You should decide
to replace BCM3563 or not.

YES

YES

Check RF Cable

Check IIC Signal

TU1001  #7, 8 Pin

Check IIC line and level shifter circuit.

Check LGDT3304 Output

Clock(R1052), Data(R1049),

Sync(R1048)

Y

Y

N

Check Tuner 5V Power

IC801

Replace IC801.

Y

N

Y

Maybe LGDT3304(IC1001) has

problems.

N

Check IC1202 power and

application circuit

Check IF Signal

TU1001  #10, 11 Pin

Check tuner application circuit or

replace tuner.

N

Y

Replace IC1201 or X1200.

N

Check IC902 digital output signal.

Check IC902 application circuit or

replace  IC902.

N

Y

Replace IC101

Y