DOWNLOAD LG 42CL40-UA (CHASSIS:LA92B) Service Manual ↓ Size: 5.14 MB | Pages: 45 in PDF or view online for FREE

Model
42CL40-UA (CHASSIS:LA92B)
Pages
45
Size
5.14 MB
Type
PDF
Document
Service Manual
Brand
Device
TV / LCD
File
42cl40-ua-chassis-la92b.pdf
Date
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- 25 -
1. TV/ CATV
Check TU1 Pin16(SIF)
Can you see the normal signal?
Check the input (Pin W2) of  LGE3159((IC100).
Measure waveform at C147 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?
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.
2. AV/ Component/ RGB- PC
Check JK1206, JK1202, JK1205
Can you see the normal waveform?
NO
JK701, JK707, JK700, JK702, JK703 
may have problem. Replace this Jack.
Check the input (PinAA3,Y1,AE1,AF3,AE3,AE2,AA1
AB1,AB2,AC2,AB3,AC3) of  LGE3159(IC100).
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 Audio_MASTER_CLK ,MS_LRCK
MS_SCK,MS_LRCH) of  LGE3159(IC100).
Can you see the normal waveform?
NO
After checking audio signal line, 
Check IC600(NTP-3100L) L606/L607
YES
NO
After checking audio signal line,
you should decide to replace item or not.
you should decide to replace item or not.
- 26 -
3. HDMI
Check input connect JK500,JK501,JK502,JK503
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
y ou should decide to replace this or not.
Check DDC communication lines (IC502)
Check the output of TDA9996HL(IC502)
_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?
Check IC600(NTP-3100L) L606/L607
YES
NO
NO
After checking the Power & Select Pin & Etc of this chip
y ou should decide to replace this or not.
After checking the Power & Select Pin & Etc of this chip
y ou should decide to replace this or not.
- 27 -
4. Speaker
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?
Check the input (Pin 7,17,18,19) of NTP3100((IC600).
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 audio signal line, 
yo u 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?
Check IC600(NTP-3100L) L606/L607
YES
- 28 -
5. SPDIF
Check the output (Pin E9) of LGE3159(IC100).
Measure waveform at R159 because it’s more easy to check.
Can you see the normal signal?
Check the input of  JK601.
Can you see the normal waveform?
YES
NO
NO
This board has big problem because 
Main chip(LGE3159) have some troubles.
After checking thoroughly all path once again,
 You should decide to replace LGE3159 or not
After checking audio signal line, 
yo u should decide to replace item or not.
YES
After checking the Jack, you should decide to replace item or not.
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