Read LG 42LT670H (CHASSIS:LA2AF) Service Manual online
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Composite / RGB-PC Audio in Trouble Shooting guide
HDMI Audio in Trouble Shooting guide
Check input signal format.
Is it supported?
Y
Check AC cable for damage
For damage or open conductor
Y
Check JK1700, P800
Can you see the normal waveform?
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
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.
Replace JK1700, P800
N
Check Audio AMP output
L503,L504,L505,L506
Replace L503,L504,L505,L506
N
Y
Check input signal format.
Is it supported?
Y
Check AC cable for damage
For damage or open conductor
Y
Check JK800, JK801, JK802
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.
Replace JK800, JK801, JK802
N
Check Audio AMP output
L503,L504,L505,L506
Replace
L503,L504,L505,L506
N
Y
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