Read LG 26LT673H (CHASSIS:LA2AM) Service Manual online
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HDMI Audio in Trouble Shooting guide
Check input signal format.
Is it supported?
Check JK800/JK801/JK802
Can you see the normal
waveform?
Replace JK800/JK801/JK802
Y
N
Check AC cable for damage
For damage or open conductor
Y
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.
Audio out Trouble shooting guide
Check the output of Mstar(IC101).
Measure waveform at R148, R503, R504.
because it’s more easy to check. Can you see the normal signal?
YES
NO
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.
Check Audio AMP output L503,L504,L505,L506
Can you see the normal waveform?
NO
YES
After checking the Power & I2C & Reset of this chip,
you should decide to replace this or not.
Check the speaker output wafer P501.
Can you see the normal waveform?
NO
YES
After checking audio signal line, you should decide
to replace item or not.
Check the connector & Speaker
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