hitachi Repair Tips

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Make	Model Ch.	Symptom	Problem Solution
Hitachi	G8Q	Dead	No activity around SAA1293H control chip - X1501 4Mhz Xtal faulty
Hitachi	G8Q	dead	ZD901 27v zener s/c
Hitachi	G8Q	Dark pic	A1 control (part of LOPTx) faulty, R881 470k high or C881 10nf leaky
Hitachi	G8Q	Channel tuning problems	IC1502 MDA2062 memory chip
Hitachi	G8Q	Buzz on sound even with vol right down	TA8691N - ord code 19869A WVE
Hitachi	G8Q	Buzz on sound	IC201 TA8691N chip reqs replacement
Hitachi	G8Q	Bright white screen	Dry joint C711 due to pressing on back cover
Hitachi	G8Q	Bright white raster	C720 4µ7 in RGB supply o/c
Hitachi	G8Q	Bright white pic with no sound	IC952 12v reg o/p down to 9.5v - reg u/s
Hitachi	G8Q	BLANK SCREEN + NO SOUND ONLY CERTAIN CHANNELS	SELECT BLANK CHANNELS PRESS TUNE/AFC VOL - STORE THEN DO THE SAME ON OTHER CHANNELS THEN PRESS TUNE/AFC
Hitachi	G8Q	Blank raster/no sound/tuning/front display distorted	Micro reqs reprog - see separate article
Hitachi	G8Q	Blank raster, can't tune chans & front controls operate different functions	Reprog memory chip IC502
Hitachi	G8Q	Blank raster &/or line twitch	C933 2200µ & C937 1µ in 12v reg cct
Hitachi	G8Q	Blank raster & no sound - stuck in AV mode	IC1501 micro faulty - pin 37 was being held low perm (should be low only when in AV mode)
Hitachi	G8Q	blank raster - no chan display	odd dashes pesent when buttons pressed. No 5v supply- D934 in chopper psu s/c & R933 2R0 u/s
Hitachi	G7PSMK2	Standby only.	R902 ( 82k ) o/c.
Hitachi	G7PSMK2	Int frame collapse.	Drys on frame IC & LOPT.
Hitachi	G7PSMK2	Dead - HT low 45v.	Change C910 , C914 , C916 , C929
Hitachi	G7PSMK2	Dead - HT at 145v.	R909 high.
Hitachi	G7PSL2	St/by only	ZD903 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 T901