DOWNLOAD LG 37LD340H / 37LD345H (CHASSIS:LA06G) Service Manual ↓ Size: 5.2 MB | Pages: 63 in PDF or view online for FREE

Model
37LD340H 37LD345H (CHASSIS:LA06G)
Pages
63
Size
5.2 MB
Type
PDF
Document
Service Manual
Brand
Device
TV / LCD
File
37ld340h-37ld345h-chassis-la06g.pdf
Date
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Analog RF Audio Trouble shooting guide
Check TU5001 Pin9(SIF)
Can you see the normal signal?
Check the input of  Mstar (IC101).
Measure waveform at C250 because it’s more easy to check.
Can you see the normal waveform?
YES
NO
Could you measure voltage of TU5001& IIC lines?
Are they all normal?
NO
You should check power line 
& IIC lines.
YES
You should replace TUNER.
NO
After checking audio signal line, you should decide to replace item or not.
AV/Component/RGB-PC Audio(in)Trouble shooting guide  
Check JK3100, JK1102.
Can you see the normal waveform?
NO
JK3801, JK1102. may have problem. Replace this Jack.
YES
Check the input of Mstar(IC101).Measure waveform at 
C236,C237,C238,C239,C4059,C4060,C244,C245
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.
HDMI Audio(in) Trouble shooting guide
Check input connect JK801/JK802
Can you see the normal waveform?
JK801/JK802 may have problem. Replace this Jack.
Check HDCP key NVRAM(IC103)
Power & I2C signal
After checking the Power of this chip, you should decide to replace this or not.
YES
NO
NO
Audio out Trouble shooting guide
Check the output of Mstar(IC101).
Measure waveform at R503, R504, R505. 
because it’s more easy to check. Can you see the normal signal?
Check the input (Pin 17,18,19) of NTP7100(IC501).
Can you see the normal waveform?
YES
NO
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.
After checking audio signal line, you should decide to replace item or 
not.
YES
Check the output (Pin 30,31,36,37,47,48,53,54) of NTP7100((IC501).
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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