LG 32LH40 / 32LH41 (CHASSIS:LA92B) Service Manual ▷ View online
- 17 -
(2) AV
Check JK1202, JK1206
Can you see the normal waveform?
Can you see the normal waveform?
NO
JK1202,JK1206 may have problem. Replace this Jack.
Check the input (Pin AN17,AM19) of LGE3159(IC100).
Measure waveform at C112,C118 because it’s more easy to check.
Can you see the normal waveform?
Measure waveform at C112,C118 because it’s more easy to check.
Can you see the normal waveform?
YES
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.
(LGE3159) have some troubles.
After checking thoroughly all path once again,
You should decide to replace LGE3159 or not.
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?
(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?
YES
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)
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)
YES
(3) Component
Check JK1206
Can you see the normal waveform?
Can you see the normal waveform?
JK1206
may have problem. Replace this Jack.
Check the input (Pin R1,R3,P2 and Pin V1,V2,U1)
of LGE3159(IC100).
Measure waveform at C101,C102,C103 and C115,C116,C117
because it’s more easy to check.
Can you see the normal waveform?
of LGE3159(IC100).
Measure waveform at C101,C102,C103 and C115,C116,C117
because it’s more easy to check.
Can you see the normal waveform?
YES
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 its more easy to check.
Can you see the normal waveform?
(3.3V, 1.9V_CORE,1.26V)
& crystal output (X800 / 12MHz)&FRC_RESET
Measure Power & waveform at L800,L801,L802,L803,
L804,L806
because its 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 replaceLGE7329.
Although you replace it, you cannot see normal display, decide to replace
Main chip(LGE3159)
After checking thoroughly all path once again, You should decide to replaceLGE7329.
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.
(LGE3159) have some troubles.
After checking thoroughly all path once again,
You should decide to replace LGE3159 or not.
- 18 -
(4) RGB PC
Check JK1201
Can you see the normal waveform?
Can you see the normal waveform?
YES
JK1201 may have problem. Replace this Jack.
NO
Check the input (Pin K1,K2,K3,L1,L3)
of LGE3159(IC100).
Measure waveform at C113,C114,C108 and R146,R149
because it’s more easy to check.
Can you see the normal waveform?
of LGE3159(IC100).
Measure waveform at C113,C114,C108 and R146,R149
because it’s more easy to check.
Can you see the normal waveform?
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?
(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)
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.
(LGE3159) have some troubles.
After checking thoroughly all path once again,
You should decide to replace LGE3159 or not.
- 19 -
(5) HDMI
Check input connect JK500,JK501,JK502,JK503
Can you see the normal waveform?
Can you see the normal waveform?
Check DDC communication lines
(IC502)
(IC502)
JK500,JK501,JK502,JK503 may have problem.
Replace this Jack.
Replace this Jack.
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?
After checking the Power of this chip,
you should decide to replace this or not.
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.
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?
(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)
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.
(LGE3159) have some troubles.
After checking thoroughly all path once again,
You should decide to replace LGE3159 or not.
You should decide to replace LGE3159 or not.
- 20 -
2. AUDIO
(1) TV/CATV
Check TU1 Pin16(SIF)
Can you see the normal signal?
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?
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?
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.
decide to replace item or not.
(2) AV/ Component/ RGB-PC
Check JK1206, JK1202, JK1205
Can you see the normal waveform?
Can you see the normal waveform?
NO
JK701, JK707, JK700, JK702, JK703 may have problem.
Replace this Jack.
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?
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.
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?
MS_SCK,MS_LRCH) of LGE3159(IC100).
Can you see the normal waveform?
NO
After checking audio signal line, you should
decide to replace item or not.
decide to replace item or not.
Check IC600(NTP-3100L) L606/L607
YES
NO
After checking audio signal line, you should
decide to replace item or not.
decide to replace item or not.
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