TV
Repair Database
|
Alba |
CTV4856 |
Height varies & tuning
comes up in wrong posn |
33v supply low at 18v -
C504 0µ1 near front pcb |
|
Alba |
CTV4881NTX |
Blank raster & no sound |
12v supply to tuner missing
- R422 10R o/c; ZD402 12v zener s/c |
|
Alba |
CTV4881NTX |
Pic size & HT varies
with brill |
C909 47µ, C910 10µ, Q902
2SB774 leaky (BC212 does) |
|
Alba |
CTV55 |
bright pic |
black bars present when A1
reduced - HT res cap C437 22µ 250v |
|
Alba |
CTV55 |
Dead |
s/c reading in lop due to
D404 FR155 eff diode (pin 11 to chassis) |
|
Alba |
CTV55 |
DEAD LINE OP TRANSISTOR
READS SC |
D404 SC |
|
Alba |
CTV55 |
NO LUMINANCE |
CHECK R423 100k R429 180k
Q303 IF REMOVING D309 CURES TRY Q304 R366 22k |
|
Alba |
CTV55 |
No luminance |
Check R429 180k & R423
100k in beam lin cct. R366 22k |
|
Alba |
CTV55 |
No pic OSD OK |
R366 ( 22K ) |
|
Alba |
CTV55 |
Smeary pic |
RGB colls only 100v, L501
330µH o/c |
|
Alba |
CTV600 |
Int shut down |
crack in print near chassis
fixing screw (emitter chopper tr to R914 near Q904 heatsink) |
|
Alba |
CTV600 |
SHUTS DOWN INT |
CRACK IN PCB
BY MOUNTING SCREW NEAR Q904 HEATSINK |
|
Alba |
CTV6682 |
Blank raster |
TDA8362A in prot mode -
C707 in field fback volts supply |
|
Alba |
CTV6682 |
Field coll & no sound |
No volts at ramp gen
pin 43 TDA8362A; R818 22k o/c |
|
Alba |
CTV6682 |
Field collapse |
R181 22k in 33v supply gone
hi |
|
Alba |
CTV6682 |
Int then dead |
chopper tfmr dry joints |
|
Alba |
CTV711 |
Dead - 1.6A fuse blown |
R801 2R7 4w o/c, BU508A
chopper tr Q800 s/c, R809 270k hi res - also check bridge rect diodes |
|
Alba |
CTV711 |
Dead - chopper tr BU508A
s/c |
R801 2R7 o/c mains rect
s/c, caused by R809 270k |
|
Alba |
CTV711 |
DEAD FUSE BLOWN
R801 2R7 4w OC BU508A SC BRIDGE |
CHECK R809 270k |
|
Alba |
CTV711 |
Dead. |
BU508A , diode in bridge
rectifiercct , R801 ( 2.7ohm )
o/c , R809 ( 270k ) o/c. |
|
Alba |
CTV713 |
Dead |
Startup resistor R108 270k |
|
Alba |
CTV713 |
Lines at top of pic |
C267 4µ7 160v leaky |
|
Alba |
CTV713 |
No pic or EHT - sound
normal |
No line drive out of
TDA4505E pin 26. Wire link beside line preset pot s/c the pot - moved link
& now ok |
|
Alba |
CTV713 |
No pic sound ok |
HT at lop tr but not at
driver tr EM202 line dr tfrmr o/c winding |
|
Alba |
CTV734 |
CHANNEL LIGHTS
NO HT |
D806 SC
( POWER SUPPLY ) |
|
Alba |
CTV741 |
Dead - Sometimes comes on
if sw On/off. |
Faulty mains transformer |
|
Alba |
CTV741 |
Dead. |
Posistor R802. |
|
Alba |
CTV741 |
Int start up |
Pin 9 TDA4601D only 6v -
R802 positor faulty |
|
Alba |
CTV741 |
Startup - poor startup. |
Posistor R802. |
|
Alba |
CTV743 |
Channel No's
but no H.T. |
D806 s/c |
|
Alba |
CTV743 |
Dead apart from chan no's |
D806
1N4936 s/c - used BYD33M |
|
Alba |
CTV743 |
FIELD COLL + NO SOUND |
R435 2R
D406 SC |
|
Alba |
CTV743 |
NO PIC OR SOUND 7 IN
DISPLAY |
D406 SC R435 OC 1R |
|
Alba |
CTV743 |
No sound & field coll |
R435 2R safety res o/c,
D406 s/c |
|
Alba |
CTV743 |
No start up & ch7
displayed |
D406 BY228 s/c & R435
1R 1w o/c in line o/p stage |
|
Alba |
CTV743 |
No startup - channel 7 in
display. |
D406 ( BY228 )
s/c , R435 ( 1ohm , 1W ) o/c. |
|
Alba |
CTV744 |
Dead - HT present |
L404 in line dr cct o/c |
|
Alba |
CTV744 |
Dead - loptx shorted |
also check R425 0R68 1w,
R435 10k, R383 220R, IC301 TA7698AP, R419, R424 10k, D302/3/4 & D409
1N4148 |
|
Alba |
CTV744 |
Dead - Psu Ok
, no line drive |
L404 oc |
|
Alba |
CTV744 |
Int sigs |
R106 10k int o/c |
|
Alba |
CTV746 |
Dead |
R220 270k, R223 150k both
o/c in psu |
|
Alba |
CTV840 |
dead |
chopper tr BU508AT s/c,
R902 2R2 safety res o/c, C909, 910 47µ 50v HT now steady at 111v |
|
Alba |
CTV840 |
Field collapse |
C404 22nf int s/c req
replacement of field chip LA8730 & supply diode |
|
Alba |
CTV840 |
No tuning |
R125 47R o/c, C127 470µ
16v s/c |
|
Alba |
CTV840 Onwa |
Black vert bars with
background pic |
C420 22µ 160v o/c |
|
Alba |
CTV840 Onwa |
No tuning although the set
displayed tuning drive |
R125 ( 47R ) was
opencircuit because C127 (
470uF 16V ) was short circuit
.These components form a filter in the 9.25V supply |
|
Alba |
CTV841 |
dead |
chopper tr BU508AT s/c,
R902 2R2 safety res o/c, C909, 911 47µ 50v HT now steady at 111v |
|
Alba |
CTV841 |
Only tunes over lower bands |
R646 10k 2w o/c (in front
of loptx) |
|
Alba |
CTV842 |
Dead - no line drive |
Line dr tfmr o/c due to
glue attack - managed to repair |
|
Alba |
CTV842 |
No colour |
Cap 0µ47 connected to pin
12 of TA7698AP decoder/tb chip |
|
Alba |
CTV842 |
No tuning |
R108 10k o/c |
|
Alba |
PTV10 |
Dead. |
Mains transformer primary
o/c. only use correct bri e. |
|
Alba |
PTV9 |
NO TV TUNING RADIO
OK |
R128 OC 6k8 |
|
Alba |
Ssangyong ETC. C |
DEAD ZD401 12v ZENER SC
R414 12R 2W OC LOP TR SC |
CHECK HT SHOULD BE 114v
CHECK ALL POWER SUPPLY CAPACITORS ,
ZENERS AND SOLDERING |
|
Alba |
T14 |
Dead - mains fuse o/c |
Q1 FET P5NA80F1 s/c due to
R294 270k o/c (RS stock FET order code 313-2857)) |
| Alba |
VTV10 |
Dead |
C480 10µ near line dr tr |
|
Alba |
VTV10 |
No vision ,
JUST BLUE SCREEN |
R7024 1r VCR P.SUPPLY.
NO HT TO TV IF AMP TRANS. |
|
Alba |
VTV19 Combi |
No pic - sound ok |
C480 10µ near line dr tr |
|
Alba |
CTV3400 |
Field foldover at top when
cold - HT low at 96v (115v) |
Q506 o/c |
