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Repair tips

Electronic appliance repair tips database - TV (LCD,TFT,Plasma,Digital), Monitor, VCR, DVD recorder and player, Digital camera, Audio equipment, Microwave ovens, Phone systems, Computer repair

MakeModelProblemSolutionDate
Found: 116
HitachiC2509T G7PSField - bottom crampC606 680mfd 16v scan coupling cap14-09-04
HitachiC25P819 G7PInt start up - B+ goes to 165v & line shuts downZD902 5v6 zener14-09-04

HitachiG7 PS2Int colourR501 1k5 o/c - also check R502 1k514-09-04
HitachiG7PBent verts at top when playing tapesTry changing C104 to 22µ & C205 to 4µ7 - if this makes no difference, reduce C701 to 3n3 & C702 to 0µ47 50v (unofficial)14-09-04
HitachiG7PBlack lines across screen & int field collapsedry joints field o/p chip IC60114-09-04
HitachiG7PCOMES ON BRIGHT THEN TRIPS OFFQ801 BC558 OR ZD804 9v114-09-04
HitachiG7PCrowbar operates aft 5 secs aft Loptx replacementZD703 faulty - measured ok out of cct14-09-04
HitachiG7PCuts out aft half hourProt thy triggers due to Q704 BF432 leaky when warm14-09-04
HitachiG7PCUTS OUT INTR919 920 100k14-09-04
HitachiG7PDeadCHECK R901 ( 3R9 ) 7W C919 ( 4.7nF ) 1Kv AND C928 ( 2.2nF ) 2Kv R932 R931 ( 100K ) Q901 ( BUT11 ) D90414-09-04
HitachiG7PDeadCHECK DIODE ACROSS BASE EMITTER OF CHOPPER TRANSISTOR14-09-04
HitachiG7PdeadLOP tr 2SD1884 s/c - use correct type14-09-04
HitachiG7PDead - HT low at 26v until LOP stage dis'dD905 MPG06J leaky14-09-04
HitachiG7PDead - mains fuse o/c - chopper tr s/cCheck R931 150k & R932 120k14-09-04
HitachiG7PDead int & blows chopper trR932 220k to pin 4 TDA4601 hi res14-09-04
HitachiG7PDEAD SURGE LIMITER O/C 3R9 7W Q901 OKC919 4n7 1kv SC14-09-04
HitachiG7PDEAD WITH ONLY 33v AT LINE OP. COLL.CHECK MAIN SMOOTHING 150mfd 400v C90914-09-04
HitachiG7PDead/Int - blowing chopper transistor.R932 gone high connected to pin 4 IC901.14-09-04
HitachiG7PField collapseReplace R719 o/c with wire link14-09-04
HitachiG7PFlashing pic - worse when tappedIC703 9v reg dry joints (could not be seen)14-09-04
HitachiG7PHum BarSlight adj of AGC preset14-09-04
HitachiG7PInt cuts out or deadR919 & R920 100k feed pin 5 TDA4601 hi res14-09-04

HitachiG7PInt fails to startCheck C914 2µ2 50v, C916 33µ 25v14-09-04
HitachiG7PInt start upC912 4n7 across TDA4600 faulty14-09-04
HitachiG7PNicam poor with clickingAdj coil L5 on panel between Txt & Nicam boards14-09-04
HitachiG7PNo line sync - pic displaced to rightNo line pulses IC701 pin12 - R726 2R2 o/c (also check R605)14-09-04
HitachiG7PNO MEMORY STORECHECK R173 , R174 , R72314-09-04
HitachiG7PNO PIC JUST SNOW , NO CONTROLS OR REM WORKIC601 FIELD CHIP AN5521 ( CHECK FOR FIELD PULSES AT PIN 15 OF IC101 )14-09-04
HitachiG7PNO TUNINGR138 ( 10k ) OC.14-09-04
HitachiG7PNo Txt - P100 onlyC2109 820pf14-09-04
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