DOWNLOAD LG 55LH40 / 55LH41 / 55LH400С (CHASSIS:LA92B) Service Manual ↓ Size: 10.58 MB | Pages: 47 in PDF or view online for FREE

Model
55LH40 55LH41 55LH400С (CHASSIS:LA92B)
Pages
47
Size
10.58 MB
Type
PDF
Document
Service Manual
Brand
Device
TV / LCD
File
55lh40-55lh41-55lh400s-chassis-la92b.pdf
Date
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LG 55LH40 / 55LH41 / 55LH400С (CHASSIS:LA92B) Service Manual ▷ View online

- 25 -
C
2009
5. HDMI
Check input connect 
JK500,JK501,JK502,JK503
Can you see the normal waveform?
Check DDC communication lines
(IC502)
JK500,JK501,JK502,JK503
may have problem. Replace this Jack.
Check the output of TDA9996HL(IC502)
_HDMI1,2,3 
or HDMI4. 
. 
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(IC105)
After checking the Power of this chip, you should decide to replace this or not.
YES
YES
YES
NO
NO
NO
NO
YES
YES
Check all power domain of LGE7329 (IC801)
(3.3V, 1.9V_CORE,1.26V) 
& crystal output (X800 / 12MHz)&FRC_RESET
Measure Power & waveform at L800,L801,L802,L803,
L804,L806
because it’s more easy to check.
Can you see the normal waveform?
This board has big problem because FRC chip(LGE7329) have some troubles.
After checking thoroughly all path once again, You should decide to replace 
LGE7329.
Although you replace it, you cannot see normal display, decide to replace 
Main chip(LGE3159)
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
- 26 -
C
2009
• AUDIO PATH
AUDIO TROUBLESHOOTING
- 27-
C
2009
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.
- 28 -
C
2009
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.
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