LG RT29FA33R free download

File name MC022ASHEET.pdf

P/NO:3854VA0098A-S(1/2) 2002.03.25

File name MC022Ats.pdf

TROUBLE SHOOTING RF- STEREO Selected correct system In menu OK Check the waveform At pin 17 of TU101 OK NO Check / Replace TU 101 NO Check the waveform At pin 24,25 of IC661 OK NO Check The Voltage At pin 16,33,46, of IC661 Check / Replace Q671, 672 Check / Replace Q621, IC603 Check The voltage At pin of IC610, IC853 NO Check the waveform At pin 4,12 of IC602 OK NO Check / Replace IC610, IC853 Check the Voltage At pin 6, 7 of IC602 OK NO Check the waveform At pin 1, 2, 14, 15 of IC602 OK Check the Voltage At pin 3,13 of IC602 NO Check / Replace F851, D862 No Raster / Sound OK Check the Heater voltage of CPT (6 ~ 6.5Vrms) OK NO Check HV, Screen Voltage of CPT NO OK Check IK Current of IC01, pin37,39,40 NO OK Check the Heater pulse of FBT T402 NO Check / Replace CPT Board Components Check FR901, P402A P402B, P302 Check FBT T402 Check FBT T402 Check IC01, Q901, IC901 P03A, P03B, P541 - 18 - NO RASTER CHECK B+ At D807 cathode Normal Is the voltage at Pin 25, 54 of IC01 3.3V? Yes Check pin 24 Of IC01(H - Out) Yes Check Q402 Collector waveform No Check & Replace Q402 Yes Check / Replace IC801, IC803, IC802 Check T401 & each pin voltage No Check & Replace T401 Yes No Check IC01 Pin1 high? No Check the In/out of IC06, IC07 Ok Check the Voltage Of C804 254~380 V Check the Voltage Pin 3 of IC801 Check / Replace Fuse , DB801 Abnormal Open Check Fuse of AC line No Check & Replace IC01 0V Check / Replace Fuse DB801 Check & Replace T402 Yes Check / Replace IC01 No Yes Is the voltage at pin3,15,45 IC02 5V? No Check & Replace IC01, IC03 Check the In/out of IC855,IC851 No Check the Voltage at D860 or D858 cathode No Check & Replace F853 ,F855 - 19 - No Picture / No Sound Is any OSD displayed? No OK Check IC01 pin37,42,43,44 (IK, R,G,B) OK Check receiving system in MENU & execute Auto - Program. OK No Check / Replace IC01 Does the auto - Program Operate properly. OK Store on manual - program MENU Check 5V, 33V & IIC Bus Line No Check 5V, 33V & IIC Bus Line Of Tuner. OK No Go to No Sound / Picture OK Check / Replace IC01, Tuner OK Check CVBS signal Line & IC01 Is the CVBS signal OK. (IC01 pin10 or 22) OK Check IK Signal at IC01 pin37 (similar to CBVS) No Check R,G,B signal At IC01, pin42,43,44 OK Check / Replace CPT Board component - 20 - AV Stereo Select correct system In menu OK OK Check the connection Of AV equipment AV Check the the waveform At pin47 of IC661 OK NO NO Check TU101 Tuner OK Check the waveform At pin 24, 25, of IC661 OK Check the voltage Of pin16,20 Check waveform At pin 4, 12 of IC602 OK NO Check / Replace IC602 Check the voltage At pin6,7 of IC602 OK NO Check / Replace Q621, IC603 Check the waveform At pin 1,2,14,15 of IC602 NO Check the vpltage At pin3, 13 of IC602 OK NO Check /Replace F851, D862 Replace IC 602 - 21 -