Read LG 32LG700H (CHASSIS:LA80A) Service Manual online
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9. Analog RF Audio
Check TU1001 Pin14(SIF)
Can you see the normal signal?
Can you see the normal signal?
Check the input (Pin AN23) of BCM3563((IC101).
Measure waveform at C636 because it’s more easy to check.
Can you see the normal waveform?
Measure waveform at C636 because it’s more easy to check.
Can you see the normal waveform?
YES
NO
Could you measure voltage of TU1001 & IIC lines?
Are they all normal?
Are they all normal?
NO
You should check power line
& IIC lines.
& IIC lines.
YES
You should replace TUNER.
NO
After checking audio signal line, you should decide to replace item or not.
10. AV/ Component/ RGB-PC Audio(in)
Check JK702, JK703, JK701, JK700.
Can you see the normal waveform?
Can you see the normal waveform?
NO
JK702, JK703, JK701, JK700 may have problem. Replace this Jack.
Check the input (Pin 21,22,11,12,7,8,9,10) of CS5345(IC500).
Can you see the normal waveform?
Can you see the normal waveform?
NO
YES
After checking audio signal line, you should decide to replace item or not.
YES
Check the Output (Pin 41,42,43) of CS5345(IC500).
Can you see the normal waveform?
Can you see the normal waveform?
NO
After checking the Power & MLCK & reset of this chip,
you should decide to replace this or not.
you should decide to replace this or not.
YES
Check the input (Pin AH24,AJ24,AK24) of BCM3563((IC101).
Measure waveform at R511,R512,R525
because it’s more easy to check.
Measure waveform at R511,R512,R525
because it’s more easy to check.
Can you see the normal waveform?
NO
After checking audio signal line, you should decide to replace item or not.
11.HDMI Audio(in)
Check input connect JK600,JK601.
Can you see the normal waveform?
Can you see the normal waveform?
Check DDC communication lines.
(IC601, IC602)
(IC601, IC602)
JK600,JK601 may have problem. Replace this Jack.
Check the output of PI3HDMI341ATR(IC603, IC604).
Can you see the normal waveform?
Can you see the normal waveform?
After checking the Power of this chip, you should decide to replace this or not.
Check HDCP communication lines(IC100).
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.
you should decide to replace this or not.
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