LG 28LM4 0B-PU Series Service Manual page 43

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Checking method:
1. Check the signal strength or check whether the screen is normal when the external device is connected.
2 2 . A A ft fter measuri i ng each h volt ltage f f rom power suppl l y, fi finall lly repl l ace t t h h e M M AIN AIN B B OARD OARD.
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