Read LG 32LB4DS (CHASSIS:LA73A) Service Manual online
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Symptom : T V set out of ord er on po wers
Check X300 ( 24MHz)
Norm al?
Re-do wnloa d
MTV416GMF (IC309 )
Norm al?
YES
NO
Replace MTV416GMF (IC309 )
and Re-do wnload
Check SI3865(Q702) 2,3pin 5V
Normal?
Replace Power board
Normal.
Check P702 all input voltage
Normal ?
YES
Check SI3865 (Q1901
,Q1902,Q1903) 2,3pin 3.3V
Normal?
YES
Check SI3865(Q702) 5pin 3.3V
Norm al?
Check SI3865 (Q1901,Q1902
, Q1903 ) 5pin 3.3V Normal?
NO
NO
NO
Check P702 wafers & connectors.
Normal ?
YES
Check P701 #3,8Pin 5V
Normal ?
YES
Replace po wer b oard.
NO
NO
Replace SI3865(Q702)
YES
Replace SI3865(Q1901,Q1902,Q1903 )
YES
NO
YES
Symptom : No booting
Check X300 ( 24MHz)
Norm al?
Re-do wnloa d
MTV416GMF (IC309 )
Norm al?
YES
Replace MTV416GMF (IC309 )
and Re-do wnload
Check SI3865(Q702) 2,3pin 5V
Norm al?
Check SI3865 (Q1901,Q1902
,Q1903) 2,3pin 3.3V Normal?
YES
Check SI3865(Q702) 5pin 3.3V
Normal?
Check SI3865 (Q1901,Q1902,
Q1903 ) 5pin 3.3V Normal?
NO
NO
Replace SI3865(Q702)
YES
Replace SI3865(Q1901,Q1902,Q1903 )
YES
NO
YES
Check SI4800 ( Q315)1,2,3Pin
1.9V Normal?
1.9V Normal?
Replace SI4800( Q315)
Replace SC2621(IC304)
YES
NO
NO
Check between FB1714 and
C345 1.2V Normal?
Replace SI4800( Q300,Q301)
Replace SC2621(IC304)
NO
NO
NO
(7) POWER
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