Read LG 55LH90 (CHASSIS:LA92C) Service Manual online
LA92B-LH40/LH55 Trouble shooting guide – HDMI
Audio(In)
Check input connect JK500,JK501,JK502,JK503
Can you see the normal waveform?
Can you see the normal waveform?
JK500,JK501,JK502,JK503 may have problem. Replace this Jack.
After checking the Power of this chip, you should decide to replace this or not.
After checking the Power of this chip, you should decide to replace this or not.
YES
YES
YES
NO
NO
NO
NO
After checking the Power & Select Pin & Etc of this chip, you should decide to replace this or not.
Check DDC communication lines
(IC502)
(IC502)
Check the output of TDA9996HL(IC502)
_HDMI1,2,3 or HDMI4. .
Can you see the normal waveform?
_HDMI1,2,3 or HDMI4. .
Can you see the normal waveform?
Check HDCP communication lines(IC105)
YES
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
NO
After checking the Power & Select Pin & Etc of this chip, you should decide to replace this or not.
NO
After checking the Power & Select Pin & Etc of this chip, you should decide to replace this or not.
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