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First of all, Check whether there is SVC Bulletin in GCSC System for these model.
No power issue
CHECK JK400 PIN4(19 V)
IS IC503 PIN15(19V),PIN16(5V)
IS IC504 PIN16(3.3V)
IS IC407 PIN6(1.1V)
IS IC202 PIN140,PIN141 PULSE
CHECK IC202
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Only for training and service purposes
Trouble shooting : No Power
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
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CHECK ADAPTER
CHECK IC503
CHECK IC504
CHECK IC407
CHECK CRYSTAL X200
LGE Internal Use Only
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