Read LG 55LH90 (CHASSIS:LA92C) Service Manual online
LA92B-LH40/LH55 Trouble shooting guide – Speaker
Audio(Out)
Check the output (Pin A8,B7,C7,D8) of LGE3159(IC100).
Measure waveform at R160,R161,R162,R163 because it’s more easy to check.
Can you see the normal signal?
Measure waveform at R160,R161,R162,R163 because it’s more easy to check.
Can you see the normal signal?
Check the input (Pin 7,17,18,19) of NTP3100((IC600).
Can you see the normal waveform?
Can you see the normal waveform?
YES
NO
NO
This board has big problem because Main chip(BCM3553) have some troubles.
After checking thoroughly all path once again, You should decide to replace BCM3553 or not.
After checking thoroughly all path once again, You should decide to replace BCM3553 or not.
After checking audio signal line, you should decide to replace item or not.
YES
NO
After checking the Power & I2C & Reset of this chip, you should decide to replace this or not.
NO
YES
After checking audio signal line, you should decide to replace item or not.
Check the connector & Speaker
Check the Output (Pin Audio_MASTER_CLK ,MS_LRCK
MS_SCK,MS_LRCH) of LGE3159(IC100).
Can you see the normal waveform?
MS_SCK,MS_LRCH) of LGE3159(IC100).
Can you see the normal waveform?
Check IC600(NTP-3100L) L606/L607
YES
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