Read LG 42SL90-UA (CHASSIS:LA92S) Service Manual online
Check JK101 or JK102 on main PCB
Can you see the normal waveform?
JK101 or JK102 on main PCB
may have problem. Replace this Jack.
Check the input (Pin R1,R3,P2 and Pin V1,V2,U1)
of LGE3369(IC601).
Measure waveform at C603,C604,C605 and C617,C618,C619
because it’s more easy to check.
Can you see the normal waveform?
of LGE3369(IC601).
Measure waveform at C603,C604,C605 and C617,C618,C619
because it’s more easy to check.
Can you see the normal waveform?
LA92S Trouble shooting guide – Component
YES
NO
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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