LG LAS350B - Automatic Input and Source Switching

3-3
ONE POINT REPAIR GUIDE
2. POWER ON ERROR
No display or Not working.
2-1. IC402
1) Check 3.3 VA at L405.
2) If 3.3 VA is not checked at the point, then find 32 V at pin1 of IC402.
3) 1), 2) is NG.  Replace IC402.
2-2. IC404
1) Check 12 VA at L427.
2) If 12 VA is not checked at the point, then find 32 V at pin1 of IC404.
3) 1), 2) is NG.  Replace IC404.
2-3. IC406
1) Check 5 VA at EC405.
2) If 5 VA is not checked at the point, then find 12 V at pin E of IC406.
3) 1), 2) is NG.  Replace IC406.
< MAIN board top view >
< MAIN board top view >
< MAIN board top view >
L405
L405
L427
L427
EC405
EC405
IC402 pin1
IC402 pin1
IC404 pin1
IC404 pin1
IC406 pin E
IC406 pin E