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Only for training and service purposes

TROUBLE SHOOTING

1. NO POWER-Main PCBA

pGhG

vG}vs{hnlG X`U[}

GG qr^WWf

NO POWER

pGZUZ}G G j^^Xf

jGG G ]WWG

YES

check open or short at Line.

or change Adapter.

check the Lines of IC701,

If there is any problem at Line,

Change IC701

Check Line short or open between

IC600 and X600,

Change IC600 or change X600

pG\}GGj^X]f

GXUX}G Gj^Z^f

YES

check the Lines of IC704,IC706

If there is any problem at Line,

Change IC704,IC706.

Insert F/W

GZUZ}G GXYG GwXYWf

GGGS

pGWG GYGG wXYWf

Change control

Or check Line short or open of P120

GGGGG XXGGwXYWS

GGGfG

YES

change IR board

Or check Line short or open of P120

]WW

LG 22LN4000 Service Manual

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