LG tch-70troubleshooting guide free download

File name tch-70troubleshooting guide.pdf

1 9. TROUBLESHOOTING GUIDE I CD PART - CD Function Select Is power turned ON? YES I NO 1 . Check power supply circuitry. I 1 NO Does initial reading occur? Check laser circuitry. F YES Check focusing circuitry. t- (_ Check disc. - , Can disc be played? I \ NO I Check track,ing servo circuitry. I - YES I 1 NO Is audio output supplied? Check Audio circuitry. I YES I 1 OK I - 30 - (1) If display LCD lighting is not normal piYGzq (W'THouT Dw 1 NO Check voltage in the power / NO Power supply circuitry Do display LCD then light? W supply circuitry. * defective. I YES 1 Is u-COM IC401 reset circuil Reset circuit defective. normal? Pin @ NO Surrounding circuit defec- tive. QV - YES 1 Is u-COM IC401 C.L.K terminal Pin @j (OSC) NO C427, C428 defective. input?