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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: 901
HitachiG7/8QPLow sound with buzzingC410 ( 0.01uF ) Between MF402 & chassis14-09-04
HitachiG7/8QPNO ON SCREEN DISPLAYR008 470k OC. OR DRY14-09-04

HitachiG7/8QPScreen goes very bright then trips.C711 ( 47u f )14-09-04
HitachiG7/8QPSET APPEARS DEAD BUT IS IN PROTECTION MODE AS HT TR909 39k HIGH14-09-04
HitachiG7/8QPSet Dead H.T. high & trippingReplace ZD903 & R909 ( 39K )14-09-04
HitachiG7/8QPSound cuts out every few minsC711 D/J14-09-04
HitachiG7/8QPSOUND GREY RASTER WITH FLYBACK LINES OR SET TRIPSC711 47uF 200v NEAR LOPT14-09-04
HitachiG7/8QPSound ok only gray raster with line at top & bottoC711 ( 47uF )14-09-04
HitachiG7/8QPStuck in standby - 300v on BUT collector.R902/3 ( 82k ) front L/H corner o/c.14-09-04
HitachiG7/8QPWHITE SCREENREFIT C17114-09-04
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
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