LG f818troub free download

File name f818troub.pdf

TROUBLESHOOTING Turn power on. NO Check power supply circuit. Is power on? (Check PN 807) YES NO Does initial read work? Check laser circuit. YES Check focus circuit. Check disc. NO Does it play? Check tracking servo circuit. YES NO Does it output audio? Check audio circuit. YES OK - 11 - Fails to initial read NO Disc motor turns. NO Does laser light? A YES YES B Does RF Does tracking Does signal Does TE2 signal NO NO NO NO waveform servo work? appear at appear at pin Defective IC appear? Lower envelope TP801(TEO)? of IC801? 801, pick up TP 801(RF) of TP801(RF) and/or open waveform is flat. wire. 1.3V YES YES YES Detective pattern. Does signal appear at IC 803 Pin and Pin ? NO Defective IC 801 and/or IC 803 YES Defective pick-up and/or connector. Is rotation normal? NO Does GFS (IC802 pin ) NO show as below? Defective IC 801. YES Is there no dropout of RF Scratch in disc NO signal? initial read area. Defectiv