Read LG 42LH5700 Service Manual online
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Standard Repair Process Detail Technical Manual
1. Video error
(1) No video/Normal audio
☞ A1 : Check LCD backlight with naked eye ☞ A2 : Inverter B+ 24V measuring method
☞ A3 : Check inverter PCB supply voltage ☞ A4 : Check White Balance value
☞ A5 : Power Board voltage measuring method
(2) No video/Video lag/Stop
☞ A6 : TUNER input signal strength checking method ☞ A7 : LCD-TV Version checking method
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