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     Fidelity  

BRIDGEND & DISTRICT AMATEUR RADIO CLUB
 GW4LNP/GC4LNP
 

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TV Repair Database
 
Fidelity 3128NF Int blows mains fuse at sw on change the degaussing thermistor to type 96209 as the original is designed for continental 220volt supplies
Fidelity C14M06 Int field collapse D25 1N4002 pin 6 IC10 TDA3653 int o/c
Fidelity C59C27 K Thick black horizontal bars from cold. C574  ( 100u f , 40v )  next to frame IC.
Fidelity CTM2000R Loss of sync when heated C100 33µ 250v HT res cap (HT still measured ok at 119v)
Fidelity CTM2000T Tripping 10nf lop tuning cap burn up & BU508A lop tr leaky
Fidelity CTV140 Dead - possible faint ticking heard Check pin 9 TDA4600 - if pulsing up/down check for s/c on chopper sec - D21 (BY299 or RGP30) often cause
Fidelity CTV140 Dead aft 10 mins Line freq increases due to C31 2n7  u/s
Fidelity CTV140 Excess brill with f/b lines Check R57 10R in dec chip supply & C100 4µ 350v in 160v RGB stage
Fidelity CTV1400 Weak contrast R106 10k or 110k o/c- also check R113/111 100k if fitted
Fidelity CTV1405R Dead D21 BY299 s/c & loadsa dry joints in PSU
Fidelity CTV1405R Tuning erratic with buzz on sound AFT coil replaced
Fidelity CTV1406 Dead HT = 130v at LOPtr - 0R68 safety res in series with line dr tr o/c & tr s/c
Fidelity CTV1406 Drifts off tune isolation diode slider no.5 tuning preset leaky
Fidelity CTV140R Dead - chopper & LOPTr s/c On/Off sw been arcing & burnt
Fidelity CTV14R Signals int & no chan 3 ML923 tuning chip & tuner
Fidelity CTV14S No sound No volts pin 14 TDA3190 - D25 dry joint
Fidelity CTV20T No sound No volts at pin 13 IC3 TDA8190 - R59 100k in series with vol cont hi res
Fidelity CTV3014F Dead - chopper tr BUZ91A s/c & 2A fuse o/c R4 270k o/c, TDA4605-3 replaced (use correct type)
Fidelity CTV3128NF Field collapse Check R614 fusible - if OK check R340 3M3 for o/c connected to pin 43 IC101 vid proc chip (under screening can)
Fidelity CTV3228 Line collapse C620 0µ47 250v scan coupling cap o/c & check R711 3R3 on E-W pcb
Fidelity CTV3228 Tuning appears same on each station Check IC302 memory chip for dry joints
Fidelity CTV3228NF Dead - fuse blown PTC thermistor int - when tapped resistance varies - replace with type 96209 30R version
Fidelity CTV3228NF Dead, pulsing LOPTr Q602 BU2525AF s/c due to R608 dry joints
Fidelity CTV3228NF Line Collapse R711 3R3 o/c, TDA8145 & C620 0µ47 250v o/c & check for dry joints
Fidelity CTV3228NF No pic - line collapse when it went off C620 0µ47 250v by scn coils plug o/c - maybe caused by dry joint - also check TDA8145 & R711 3R3 on e-w panel
Fidelity CTV3228NF No pic - sound ok R618 100k 1w hi res, C600 1µ 0µ47 250v leaky & C620 0µ47 250v low cap
Fidelity CTV920 Dead apart from buzz & low HT volts C171 3300pf 2Kv burnt & split
Fidelity CTV920 Low HT or no HT .HT may drop to 0v if line stage dissconnected and replaced by dummy load  ( lamp ) . C169 1uF 50v OC  , STK7348 may be OC .
Fidelity CTV920 Poor cold start up XC169 1µ 50v
Fidelity F14 Int start up Chopper BU508A dry joints & R84 15k 5w hi res
Fidelity F14 No signals/search Check switches on back of set not stuck down
Fidelity LC169 No sound/sync R109E - part of chain of 10 x 5k6 res o/c
Fidelity WSTV7028NF AK19 Lack of width & striation on lh side C630 430nf 250v o/c in lop E/W mod area
Fidelity ZX1410 Dead D21 SC BY299
Fidelity ZX1410 POOR CONTRAST  ,  CONTROL DOES VERY LITTLE C96 0.1uF 50v  ( BETWEEN HEATSINK AND LOPT )
Fidelity ZX1410 Weak contrast with no control C96 0µ1 50v in beam lim
Fidelity ZX1415 Dead - BUT11A s/c. Replace IC8 ( UC3844N )  , check R110 , R115.
Fidelity ZX1415 Dead - fuse Ok. Drys or broken print at TR4.
Fidelity ZX1415 Int frame collapse D25 INT OC
Fidelity ZX1415 No sound or raster - Ht Ok. TR5 ( BC558 )
Fidelity ZX1415 Will not store channels. Select channel number with remote after pressing store button.
Fidelity ZX2000 Channels - will not go to ch 3. IC ML923 tuning chip.
Fidelity ZX2000 Dark picture. C412  ( 100pf )  leaky.
Fidelity ZX2000 dead Pulsing 7v at ZD5 12v zener; R801 18k 8w o/c
Fidelity ZX2000 Dead - blowing chopper transistor. R826  ( 39R  )  goes high.
Fidelity ZX2000 Dead - fuse's ok. Droper R801 ( 18k )  o/c , chopper transistor , D24  ( RGP15J )
Fidelity ZX2000 Dead - tripping. IC TDA2581.
Fidelity ZX2000 Frame - foldover & lack of height. C706.
Fidelity ZX2000 Frame collapse. IC9  ( TDA1170S )
Fidelity ZX2000 Intermittent no signals. Leak from R121 lower leg touching print.
Fidelity ZX2000 No colour IC6  ( TDA1365 )
Fidelity ZX2000 No pic - sound ok Ai volts low - 10n 2kv decoupler leaky
Fidelity ZX2000 Striations & fback lines RGB supply cap 4µ7 350v o/c
Fidelity ZX2000 Striations over screen. C903  ( 4u7f )  o/c.
Fidelity ZX2000 Tripping - dead. IC TDA2581.
Fidelity ZX3000 Alternate channels missing i.e all odd. IC1 ( M104B1 ) .
Fidelity ZX3000 Blank raster. IC4 ( TDA8180 )
Fidelity ZX3000 Blank raster. IC TDA3562A.
Fidelity ZX3000 Blows chopper tr BU426A R91 270k to pin 4 of TDA4600 hi res. Also check TDA4600 chip, D9, R90, C93
Fidelity ZX3000 Bright raster. IC TDA1365.
Fidelity ZX3000 Channel - no change - no remote operation. Stereo balance switch leaky.
Fidelity ZX3000 Channels - int manual channel change DJ on front panel switch.
Fidelity ZX3000 Cogging -serrated verts- may be intermittent. C100  ( 33uf , 250v )  may read Ok.
Fidelity ZX3000 Dead - 2amp fuse & BU508 blown. Bridge  rectifierD19 leaky
Fidelity ZX3000 Dead - blowing BU508. C91  ( 1u f )
Fidelity ZX3000 Dead - F2 blown. BU208 , D9 , R90 , C93  ( the cause )  R91 goes high.
Fidelity ZX3000 dead - whines at sw on low HT at lop tr. - tr leaky BU508A - C106 dry joint caused fault
Fidelity ZX3000 Dead Tv section. IC TDA8180 timebase generator.
Fidelity ZX3000 dead with cracks from lopt loptx faulty
Fidelity ZX3000 Dead. D34 s/c ,  R828 o/c.
Fidelity ZX3000 Dead. R84  ( 68R  )  o/c , L2 o/c.
Fidelity ZX3000 Dead. BU426 , BU500 s/c , 2R2 o/c , TDA4600 u/s , check 220uf , 305v o/c
Fidelity ZX3000 Dead. TR3  ( BU508A )  chopper leaky , check TDA4600 & C93.
Fidelity ZX3000 Display stuck on one number. IC1 ( M104B1 ) .
Fidelity ZX3000 Excess blue Tr6 BC558 leaky
Fidelity ZX3000 Excess Red 100k in red chan risen to 260k
Fidelity ZX3000 FIELD JITTER FROM COLD TDA1170S IC4
Fidelity ZX3000 FIELD ROLL PR9 220k PRESET OC OR R25 HIGH
Fidelity ZX3000 FIELD STRETCHED C59 1000uF 14"  2200uF 20"
Fidelity ZX3000 Frame - no frame hold. 12 volt regulator only giving 10.8v.
Fidelity ZX3000 Frame - reduced. C91  ( 1u f )  , HT preset control.
Fidelity ZX3000 Frame - rolling - may be intermittent. IC TDA8180 loose in its holder.
Fidelity ZX3000 Frame collapse - sound Ok. IC TDA2270 IC4.
Fidelity ZX3000 Frame collapse then blows LOP transistor. IC TDA2578A.
Fidelity ZX3000 Goes Bright White / Red / Yellow & off int Dry joints CRT heaters on CRT base pcb
Fidelity ZX3000 Grey raster. IC5 ( TEA1014 )
Fidelity ZX3000 High Ht rail. C91 ( 1uf )
Fidelity ZX3000 Line tearing. C100  ( 33u f , 250v )  HT reservoir cap.
Fidelity ZX3000 No picture. IC TDA3562A check 10m A1 bleed resistor.
Fidelity ZX3000 No sound. R59 100k in series with vol slider gone high 2meg?
Fidelity ZX3000 No video - sound ok. IC  ( TDA3562A )  , IC5  ( TEA1014 )
Fidelity ZX3000 PIC TOO WIDE + VERTICAL BANDS ON SCREEN R101 DRY OR OC
Fidelity ZX3000 POOR STARTING C89 100u 25v
Fidelity ZX3000 Presets sensitive. L1 readjusted.
Fidelity ZX3000 Pulsing/rolling on high brightness HT was set at 138v instead of 150v (22" version)
Fidelity ZX3000 Remote inoperative - no channel change. Stereo balance switch leaky.
Fidelity ZX3000 RINGING ON VERTICALS C100 33u 250v
Fidelity ZX3000 Rolling. 220k preset frame control PR9 , R25  ( 470k )  goes high.
Fidelity ZX3000 Sound - distorted when hot. IC TDA8190.
Fidelity ZX3000 Sound - distorted. IC7  ( TDA3810 )  on audio board.
Fidelity ZX3000 TAKES UP TO 1hr TO COME ON FAINT PULSES CAN BE HEARD R82 , 83 10k D7 OR C87 100uF 25v
Fidelity ZX3000 Tripping - dead. D13 s/c.
Fidelity ZX3000 Tripping - when changing channels. Change C818 to between 2n2 & 1n5.
Fidelity ZX3000 Tuning - problems with tuning. Change C1  ( 100n )  checks ok on meter - off tuner unit.
Fidelity ZX3000 TV DEAD NO LINE DRIVE TDA8180 US
Fidelity ZX4000 Blank raster with flyback lines. IC3  ( TDA3330 )
Fidelity ZX4000 Caption buzz with very low sound Adj I/c sound coil L5 to elliminate buzz, adj L4 vid det & L7 sound trap to elliminate patt
Fidelity ZX4000 Channels - stuck on channel 1. IC ML923 selector IC , C221  ( 0.01uf )  leaky.
Fidelity ZX4000 dead R110 2R2 o/c, BU508A s/c, due to R119 150k o/c also change R118 120k
Fidelity ZX4000 dead HT at chopper - R120 330K o/c, C97 1µ leaky; D24 HT rect BY299 s/c
Fidelity ZX4000 dead 1.6A fuse o/c; BU508 chopper tr s/c; R309 150k o/c; also replaced R311 120k
Fidelity ZX4000 Dead - fuse F1 blown. C81  ( 150u f 385v )  s/c.
Fidelity ZX4000 dead - tripping C122 10n dry joint & arcing. Blew BU508D lop tr
Fidelity ZX4000 DEAD PIN 9 TDA4600 PULSING SHORT ON CHOPPER TX SECONDARY USUALLY D21
Fidelity ZX4000 Dead. R98 o/c.
Fidelity ZX4000 Dead. D21  ( BY299 )  s/c.
Fidelity ZX4000 Dead. R84 ( 15k )  o/c , C87 ( 47uf or 100uf 250v )  low.
Fidelity ZX4000 Dead. D21 ( BY299 )  s/c.
Fidelity ZX4000 Distorted sound. Speaker.
Fidelity ZX4000 Excess Green TDA3330
Fidelity ZX4000 Excess red pic Judicious adj of A1 control cured it
Fidelity ZX4000 Frame - cogging. C101  ( 100uf , 250v )  o/c.
Fidelity ZX4000 Frame - verticals corrugated. C87  ( 100u f , 250v )
Fidelity ZX4000 Hard to tune in stations. Slightly adjust L4  ( video detector coil )
Fidelity ZX4000 Int fails to come on. R84 ( 15k 5w )  high , Drys on TR2  ( BU508A )
Fidelity ZX4000 Int loss of picture - sound mutes. C31  ( 2.7nf )
Fidelity ZX4000 Int relay trips releasing mains switch. C87  ( 100u f 250v )
Fidelity ZX4000 int tuning/no sigs esp low freqs Tuning volts wont fall below 5.4v; R157 2M2 o/c
Fidelity ZX4000 Intermittent picture. DJ on brightness control.
Fidelity ZX4000 Lack of height. PR17 ( 220R  )  high.
Fidelity ZX4000 Lack of width. C87  ( 100u f 250v )
Fidelity ZX4000 Memory - will not store channels. R514 should be 2.7k , R315-9 should be 1.8k see mag.
Fidelity ZX4000 No colour IC3  ( TDA3330 )
Fidelity ZX4000 No colour. Tuner!
Fidelity ZX4000 No contrast. R113 ( 100k )  o/c , check R111 ( 100k ) &R106 ( 10k )  , cct shows 1 R106  ( 110k )
Fidelity ZX4000 No frame. IC TDA3651.
Fidelity ZX4000 No picture - no A1 supply. C201 s/c.
Fidelity ZX4000 No visible raster - EHT & heaters Ok A1 at 12 C201 ( 10nf 2Kv ) leaky on CRT base.
Fidelity ZX4000 Not storing stations. Store button o/c may be int.
Fidelity ZX4000 Peak white. IC3 faulty.
Fidelity ZX4000 Picture break up with corrugated verticals. C87  ( 100u f 250v )
Fidelity ZX4000 Picture rolling. Slightly adjust L4  ( video detector coil )
Fidelity ZX4000 PICTURE TOO BRIGHT + FLYBACK LINES ON SCREEN TRY R57 10R OR C100 4u7 350v
Fidelity ZX4000 Shutdown - no sound or picture after 10 mins C31  ( 2.7nf )  connected bt pin 23 of IC2 & chassis.
Fidelity ZX4000 Sound intermittent. DJ on volume control.
Fidelity ZX4000 Sound mutes - int no picture. C31  ( 2.7nf )
Fidelity ZX4000 St/by only BUT56A chopper tr s/c, 1.6A fuse o/c - dry joints C28 yellow cap by lopt
Fidelity ZX4000 Stuck on channel 1. C221 ( 10nf )
Fidelity ZX4000 SWITCHES OFF INT 12v REG INT OC REPLACE LM317T
Fidelity ZX4000 Tuner - drift. IC201  ( M490B1 or M490BB1 )
Fidelity ZX4000 Tuner drift. IC1 ( SL1431 )  , ZD2 ( BZYC5V1 ) adj AFC coil after fitting.
Fidelity ZX4000 Tuner drift. Slightly adjust L4  ( video detector coil )
Fidelity ZX4000 Tuning - low gain. SWARF IF filter , Tuner.
Fidelity ZX4000 Tuning - no tuning. Crack in print between TAA550 & pin 11 of SL470.
Fidelity ZX4000 Tuning - will not store. IC TAA550 33v regulator goes leaky.
Fidelity ZX4000 Tuning drift. IC SL471 , Tuner.
Fidelity ZX4000 Tuning drifting. ZD1  ( TAA550 )  , IC201  ( M490 )
Fidelity ZX4000 Tuning memory not storing if switched off. IC201  ( M490 )
Fidelity ZX4000 Unable to tune in. SUF341 tuner.
Fidelity ZX4000 White raster - bright. IC3  ( TDA3330 )
Fidelity ZX4000 Wont store chans tho tunes ok ZD1 TAA550 leaky
Fidelity ZX41010 Black bars across pic (4) C45 10µ 50v
Fidelity ZX4120 Dead - int failure of R98 0R68 surge lim 16v supply too high - C87 100µ
Fidelity ZX4200 Corrugated verticals. C87 ( 47uf )
Fidelity ZX4200 Dead - with faint ticking. D21  ( BY229P )  s/c , may be due to LOPTX being faulty.
Fidelity ZX4200 Field stretched at top, ragged verts & hum bar C87 47µ 200v
Fidelity ZX4200 Int blowing BU508D TR5. C84 ( 2.2nf 2Kv )
Fidelity ZX4200 Int cutting out. C87  ( 47uf )  leaky.
Fidelity ZX4200 Lack of contrast. R111 ( 100k 1/2w )  RHS of LOPT.
Fidelity ZX4200 Lack of width - HT low. C87  ( 47uf )  leaky.
Fidelity ZX4200 No go - just1 Psst at switch on. C93  ( 1uf , 100v )  o/c by TDA4503 IC.
Fidelity ZX4200 Small raster. Replace C111 with a 47uf 250v )
Fidelity ZX4200 Switching off - Tuning drift. C87  ( 47u f 250v )
Fidelity ZX4200 Tripping. TR5  ( BU508D )  s/c.
Fidelity ZX5000 Blank raster with lines at top & noises C18 HT res cap 220µ 250v
Fidelity ZX5000 dead BUT56A chopper tr s/c, C28 10n burnt leg, C5 4µ7 replaced, C18 100µ 250v o/c
Fidelity ZX5000 Dead - Chopper tr BUT11A s/c Replace C5 4µ7 63v, C7 220µ 25v, IC1 UC3844N, IC13 CNY75B opto
Fidelity ZX5000 Dead BUT56A s/c. R120  ( 3.3ohm )  o/c , R115 ( 0.68ohm )  , C5  ( 4.7uf )  , IC13 ( UC3844 )
Fidelity ZX5000 Dead. HT low at 30v , C18 ( 100uf 250v )
Fidelity ZX5000 NO GREEN AND NO COLOUR UNLESS BRIGHTNESS TURNED UP VCU2213 US

 


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