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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
Make
Model
Problem
Solution
Date
Found: 13
Fidelity
CT
M20
00R
Loss of sync when heated
C100 33µ 250v HT res cap (HT still measured ok at 119v)
14-09-04
Fidelity
CT
M20
00T
Tripping
10nf lop tuning cap burn up & BU508A lop tr leaky
14-09-04
Hikona
R
M20
02
Crackle on sound unaffected by vol setting
check 47µ tant coupling cap under IF screening can
14-09-04
Hikona
R
M20
02
No sound
IC101 TA7680 Audio o/p chip pin 1 (vol cont) should read 5.8v at min vol & 0v at max. Was not varying - Q201 faulty - BC238 does
14-09-04
Hikona
R
M20
02
No sound.
Q201 ( BC238 ) but diff legout , TA7680
14-09-04
Murphy
M20
T01 ZX4200
No go - just1 Psst at switch on.
C93 ( 1u f , 100v ) o/c by TDA4503 IC.
14-09-04
Pye
L6.1AA
M20
52/05
Dead - off with a bang
Replace suspect LOPTx, s/c cap & s/c LOPTr 5422 LOPTx 20" L6 (4822 140 10561) 2422 560nF 5% 250V (4822 121 42634) 7422 BUT11APX (4822 130 10206
14-09-04
Pye
M20
52
Dead - no line drive
Opto-coupler CNX82A - (line drive fed thro opto)
14-09-04
Saisho
C
M20
80T
Dead - HT only 33v
LOPTr Q402 2SD1555 leaky & replace STR50103A & R502/3 330k
14-09-04
Saisho
C
M20
80T
Field - only half a pic
C421 in volts boost cct
14-09-04
Saisho
C
M20
80T
Int field roll, full vol, into Txt etc at sw on
C462 1µ 160v
14-09-04
Saisho
C
M20
TT
St/by only
STK7308 u/s - also check R502/503 120k
14-09-04
Sony
KVXF25
M20
Lightening damaged
Smoothing cap C613 560uf, Low v p/supply; D631 + D632 - s/c R602 4r7 o/c, C646 10uf 450v - popped, Q605 2SK2845- leaky, D623 12v zener - leaky
14-09-04
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