Read LG 55LS675H (CHASSIS:LA2AG) Service Manual online
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4. Digital RF Trouble shooting guide
5. AV Video Trouble shooting guide
Check RF Cable
Check IIC Signal
TU3001 #3, 4Pin
Check IIC line and level shifter circuit
Y
N
Check Tuner 5V Power
L3000
Check L3000
Y
N
Y
Check X201
and application circuit
Check IF Signal
TU3001 #10, 11 Pin
Check tuner application circuit or
replace tuner.
N
Y
Replace X201
N
Y
Replace IC101
Replace IC5000
N
Y
Replace L3000
Check JK1700
Can you see the normal waveform?
N
JK1700 may have problem. Replace this Jack.
Check the input of Mstar(IC101).
Measure waveform at C217 because it’s more easy to check.
Can you see the normal waveform?
Y
This board has big problem because Main chip (Mstar) have some troubles.
After checking thoroughly all path once again,
You should decide to replace Mstar or not.
Y
Check input signal format.
Is it supported?
Y
Check AC cable for damage
For damage or open conductor
Y
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