hitachi Repair Tips




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Results 930
MakeModel Ch.SymptomProblem SolutionSolutionBy:
HitachiG7PS2
BRIGHT WHITE THEN FIELD COLLAPSECHECK Q801 SC
HitachiG7PS Mk2
Field collapse 1cm highIC703 AN7809 9v reg leaky
HitachiG7PS C2119T
St/by onlyR903 82k by chopper tr hi res, or IC601 LA7836 fop chip
HitachiG7PS C2114T
Stuck in st/byHT ok at 112v - cause was FOP chip TDA8274K
HitachiG7PS C2114T
Sound absent & streaky white lines on pic when coldC955 47µ 25v in 15v smoothing supply
HitachiG7PS C2114
Reverts 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 replaced
HitachiG7PS C21119T
Field collapse intD601 1N4002 flyback boost diode going int o/c
HitachiG7PS
Striations on lh side - ok from scartL101 choke in 12v supply faulty
HitachiG7PS
R763 burns up at sw onR760, 761, 762 & 766 all o/c & R763 3k3 replaced
HitachiG7PS
PSU blow upReason could be - T901 dry joints on pcb & wrapped end
HitachiG7PS
low ht 40v & Q903 chopper overheatingD905 s/c
HitachiG7PMk2 CPT2808
To bypass Txt panel when a fault here is suspected of causing pic faultShorting pins 2 & 3 of the 5 pin connector (E001) on the main board. This links the video in to the sync out lines, thus restoring normal picture and sound.
HitachiG7PII
St/by only - trips at sw onIC703 reg dry joints
HitachiG7PII
St/by only - trips at sw onHT = 130v (110v) R909 39k risen in value and adj HT pot
HitachiG7PII
St/by onlyC906 4µ7 250v, ZD903 130v zener s/c & R909 39k as a precaution
HitachiG7PII
slow start upR909/2/3 all ok but C906 4µ7 250v hi esr & C905 100µ 160v
HitachiG7PII
No start up - comes on briefly then tripsR909 39k hi res
HitachiG7PII
No start upPin 9 IC901 low at 5v (9v) - C914 10µ 50v faulty
HitachiG7PII
int start upstart up volts pin 9 IC901 only 2v - check/replace resistor chain R939,940,941,942,902,903 & C914 2µ2
HitachiG7PII
Int offR919/920 100k also check R932 150k