LG TROUBLESHOOTING free download

File name TROUBLESHOOTING.pdf

TROUBLESHOOTING Turn power on. Check power supply circuit. NO PN807 PIN5, 6.2V Is power on? PN807 PIN7, 5V IC803 PIN 2, 3.3V YES NO NO Does initial read work? Check the DISK turns Check the connector PN801, PN802, PN809 YES Check the Laser YES YES Check the focus circuit YES Check the TRAKING circuit NO Does it play? Check the tracking servo circuit. YES NO Does it output audio? Check the PN807 PIN1, 3 OK - 2-3 - Fails to initial read NO Check the Voltage change of PN 809 NO Defective connector Disc motor turns PIN20(OPEN, CLOSE) PN809 YES YES Does RF waveform appear? Check the Data transmission from Defective connector NO NO IC801 Pin3 PN809 pin11 to CD DSP PN809, Defective 5V MICOM 0V YES Check the Data transmission from Defective connector PN809 pin13 to MICOM PN809, Defective NO 5V IC801 0V YES Check the chan