LG 078B TRO free download

File name 078B_TRO.pdf

NO RASTER CHECK +B at D821 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 of IC841/IC844 Check pin40 Check the voltage No of C805 of IC501(H-out) 0V No Check &replace Yes 254~380V Check /replace IC501 Check u-COM DB801 Check Q401 pin3 low? Check the voltage No collector waveform of pin3 Printed Circuit Board Check &replace Yes Q401 Check T401 Check /replace & each pin voltage IC801,IC803,IC804 No Check &replace Yes T401 Check &replace T401 NO TELETEXT Check the voltage at pin44 of IC01 0V 3V Check& Replace Check the waveform IC01,IC03 at pin12 of IC01 NO YES Check / Replace Check& Replace Q512,R533 38~41pin of IC01 NO RASTER / SOUND OK Check the Heater voltage of CPT (6 ~ 6.5Vrms) OK Not OK Check Check Check the HV, Screen voltage of Ik Current of