Read LG 42SL90-UA (CHASSIS:LA92S) Service Manual online
LA92S Trouble shooting guide – RGB PC
Check JK106
Can you see the normal waveform?
Can you see the normal waveform?
YES
JK106 may have problem. Replace this Jack.
NO
Check the input (Pin K1,K2,K3,L1,L3)
of LGE3369(IC601).
Measure waveform at R644,R645,C615,C610 and C616
because it’s more easy to check.
Can you see the normal waveform?
of LGE3369(IC601).
Measure waveform at R644,R645,C615,C610 and C616
because it’s more easy to check.
Can you see the normal waveform?
Video
NO
YES
YES
Check all power domain of LGE7329 (IC801)
(3.3V, 1.9V_CORE,1.26V)
(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?
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
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(LGE3369)
This board has big problem because Main chip(LGE3369) have some troubles.
After checking thoroughly all path once again, You should decide to replace LGE3369 or no
After checking thoroughly all path once again, You should decide to replace LGE3369 or no
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