LG 075atro free download

File name 075atro.pdf

TROUBLESHOOTING NO RASTER CHECK +B at D807 cathode Normal Abnormal Check Open Is the voltage at pin37 FUSE of AC line & 12 of IC501 8V? No OK Check /replace Yes Check the in/out Fuse,DB801,IC803 of IC844 Check pin40 Check the voltage No of C806 of IC501(H-out) 0V No Check &replace Yes 254~380V Check /replace IC501 Check u-COM DB801,R811 Check Q402 pin28 low? Check the voltage No collector waveform at pin4 of IC804 Check T401 & No each pin voltage Check /replace Q807 Check /replace D806,IC804,R809,R810 NO TELETEXT Check CVBS signal at IC01 pin12 OK Check IC01 & IICBus Line Not OK Check / Replace Q10 & IC501 - 16 - NO SOUND / PICTURE OK Check the voltage of SMPS 25V at pin9 of IC601 Abnormal Normal(20~25V) Check/Replace of Check the voltage FR803 & D804 swing of pin2 of IC501 Check demodulated signal of pin15 of IC501 Check demodulated Check/