Read LG 26LT673H (CHASSIS:LA2AM) Service Manual online
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Analog RF Audio Trouble Shooting guide
Check RF Cable & Signal
Check Audio AMP output
L503,L504,L505,L506
Y
Check TU3001 Pin1 (SIF Output)
Can you see the normal signal?
Y
Could you measure voltage of TU3001& IIC lines?
Are they all normal?
N
You should check power line &
IIC lines.
N
You should replace TUNER.
Y
Check IC501
Y
Replace IC501
N
Replace L503,L504,L505,L506
N
Check the input of Mstar (IC101).
Measure waveform at C250, C251 because it’s more
easy to check.
Can you see the normal waveform?
Y
After checking audio signal line, you should decide to replace
item or not.
N
AV/Component/RGB-PC Audio(in)Trouble shooting guide
Check input signal format.
Is it supported?
Check JK1700, P900
Can you see the normal
waveform?
Replace JK1700, P900
Y
N
Check AC cable for damage
For damage or open conductor
Y
Y
Check the input of Mstar(IC101).
Measure waveform at C236, C237, C244, C245 because it’s more easy to
check.
Can you see the normal waveform?
Y
Check Audio AMP output
L503,L504,L505,L506
Y
Replace L503,L504,L505,L506
N
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.
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