Read LG 42LH5700 Service Manual online
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☞ A16 : Exchange Module itself (2)
2. Power error
(1) No power
☞ A17 : Check front display LED ☞ A18 : Check power input Voltage & ST-BY 5V
☞ A19 : Checking method when power is ON ☞ A20 : POWER BOARD voltage measuring
method
☞ A21 : Check Power Switch
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