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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
HitachiG7PSStriations on lh side - ok from scartL101 choke in 12v supply faulty14-09-04
HitachiG7PS C21119TField collapse intD601 1N4002 flyback boost diode going int o/c14-09-04

HitachiG7PS C2114Reverts to st/by when r/c operated after set been on several hoursAlso when Chan 8 selected set goes to Ch 9 - IC001 micro TMP series replaced14-09-04
HitachiG7PS C2114TSound absent & streaky white lines on pic when coldC955 47µ 25v in 15v smoothing supply14-09-04
HitachiG7PS C2114TStuck in st/byHT ok at 112v - cause was FOP chip TDA8274K14-09-04
HitachiG7PS C2119TSt/by onlyR903 82k by chopper tr hi res, or IC601 LA7836 fop chip14-09-04
HitachiG7PS Mk2Field collapse 1cm highIC703 AN7809 9v reg leaky14-09-04
HitachiG7PS2BRIGHT WHITE THEN FIELD COLLAPSECHECK Q801 SC14-09-04
HitachiG7PS2DEAD , 130v ZENER s.c.REPLACE R909 39K EVEN IF READS OK.14-09-04
HitachiG7PS2Dead.112v rail high R716 ( 51k ) o/c.14-09-04
HitachiG7PS2Fails to startR902 & R903 ( 82K )14-09-04
HitachiG7PS2HIGH EHT WITH SET TRIPPING TO SBY INSTANTLYR909 39K HIGH also replace ZD90314-09-04
HitachiG7PS2INT DEADZD901 6v8 zener14-09-04
HitachiG7PS2INT DEAD39K - 82K POWER SUPP - ALSO D/J on reg 12V (EDGE OF PCB BY LOPT. )14-09-04
HitachiG7PS2INT. FLAG WAVING AFTER TELETEXT USEIC2002 ( TEXT PCB )14-09-04
HitachiG7PS2No OSD set works okReplace HD401314RS14-09-04
HitachiG7PS2No signals Tuning bar moves as if tuning but no vaCheck R044 ( 12K )14-09-04
HitachiG7PS2OSD NOT CLEARINGDOO7 HIGH14-09-04
HitachiG7PS2Shuts down aft 20 secs with buzzIn prot mode (shutdown volts at pin 20 TA8690AN) ZD701 3v9 zener leaky14-09-04
HitachiG7PS2STANDBY ONLYIC703 DRY JOINTS14-09-04
HitachiG7PS2When tried to tune in the correct display appearedThe 33V tuning voltage supply was missing because R044 ( 12k ) was open-circuit.14-09-04
HitachiG7PSLExcess bright rasterRGB colls low volts - Q801 BC558B leaky (on main pcb)14-09-04

HitachiG7PSLField chip has short lifeAdd 2 x 33v zeners in series - cathodes to pin 2 IC601 & anode to chassis - if this has no effect , could be crt flashover14-09-04
HitachiG7PSLField jitter when hotD601 1N400214-09-04
HitachiG7PSLField non linC712 2200µ 50v & C606 680µ 16v14-09-04
HitachiG7PSLNo signals - osd searchesTuning volts missing VT pin tuner, R044 12k o/c14-09-04
HitachiG7PSLNO TUNING - JUST SNOW ( TUNING BAR PRESENT ON SCRER044 12k OC. ZD002 ( 33V Zen ) Q00314-09-04
HitachiG7PSLSt/by onlyQ781 2SD1884 LOPTr, Q903 BUT12AF chopper tr & ZD903 P6KE180A overvolts zener s/c - R760, R761, R762 & R766 2R2 ?w hi res14-09-04
HitachiG7PSL2St/by onlyZD903 130v zener s/c; C906 4µ7 250v hi esr; R901 6R8 5w o/c;Q903 BUT12AF s/c; F901 2.5A o/c - all caused by dry joints T90114-09-04
HitachiG7PSMK2Dead - HT at 145v.R909 high.14-09-04
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