TV
Repair Database
|
Decca |
30 |
brightness - variations
intermittent. |
Clean preset brightness
control. |
|
Decca |
30 |
Contrast - varying esp
between stations. |
C60 ( 22u f ) |
|
Decca |
30 |
Green picture. |
IC MC1327P. |
|
Decca |
30 |
Light & dark vertical
bands ( striations ) |
PL509 , P7500 , C423. |
|
Decca |
30 |
Line slow to settle after
adj line freq. |
R430 ( 39k ) high. |
|
Decca |
120 |
dead |
No HT at lop tr - fusible
R430 o/c when recon hissing noise - tripler |
|
Decca |
120 |
dead |
1A fuse o/c, BU426A s/c,
R810 150k o/c - also replaced R808 47k |
|
Decca |
120 |
Dull pic with no contrast
control |
Beam lim bias res R425/426
68k o/c |
|
Decca |
120 |
Field cramp when heated |
R813 set ht pot R813 10k
int slider |
|
Decca |
120 |
Low pitched whistle with
sound full blast |
Also no tuning - check
tripler |
|
Decca |
120 |
Tripping from cold ok when
heated |
C804 220µ 385v mains
smoothing cap |
|
Decca |
130 |
Tripping |
R816 100R o/c in psu |
|
Decca |
140 |
dead |
no 18v supply - D811 dry
jointed |
|
Decca |
140 |
Dead with ticking/buzzing -
HT low at 50v |
C807 & 808 100µ 25v |
|
Decca |
140 |
Field bounce in Txt |
Dry joint pin 8 connector
M501 |
|
Decca |
140 |
field collapse - no pic |
R434 10R safety res in 25v
feed to field chip o/c no other ff |
|
Decca |
140 |
Int changes chan on its own |
Focus spark gap |
|
Decca |
140 |
Int snowy pic |
Q101 BF959 SAWF driver int |
|
Decca |
140 |
Int start up |
R805 390k hi res also check
R802 10k dry joints |
|
Decca |
140 |
Loud hum at sw on with no
pic |
C807, C808 & C810 100µ
25v |
|
Decca |
140 |
No tuning/sigs |
No tuning volts pin 4 tuner
- RR70 33k o/c |
|
Decca |
140 |
Ragged verticals |
C822 &C826 47µ 250v |
|
Decca |
140 |
Slow start up with
crackling |
C807, C808 & C810 100µ
25v |
|
Decca |
140 |
Streaky pics |
D403 BA159 200v rect diode |
|
Decca |
140 |
TRIPS POOR START OR NOISY
START UP |
C808 100uF
( PIN 9 4600
) |
|
Decca |
140 |
Won't sw on from st/by |
SAA1351 r/c chip - also
tripler (OK when r/c cct bypassed) |
|
Decca |
141 |
Field roll |
R423 2M2 ½w o/c |
|
Decca |
145 |
Bright raster |
R436 10R fusible |
|
Decca |
145 |
Dead - chopper tr failure |
R808 100k, R810 82k |
|
Decca |
145 |
No raster with muffled
sound (field collapse) |
R434 10R fusible field o/p
supply |
|
Decca |
145 |
No tuning. |
68 ( 33k ) o/c at
front L/H side , Also change R003 (
13k , 1W ) |
|
Decca |
145 |
Slow
start up |
R816 100R 1w int |
|
Decca |
145 |
Trips at sw on until warm |
C808 100µ in psu |
|
Decca |
145 |
Tuning drift |
M293AB1 tuning synth chip
IR03 |
|
Decca |
146 |
Blank raster |
Pin 7 TDA3561 low - D502
BZX79C5V6 zener s/c |
|
Decca |
150 |
Col fault - like hanover
bars |
acc decoupler C516 4µ7 u/s |
|
Decca |
150 |
Colour - alternate bars of
colour & no colour |
AGC decoupler C516
( 4.7uf ) |
|
Decca |
160 |
Colour int. |
IC TDA3565 decoder IC |
|
Decca |
160 |
dead |
HT at chopper tr coll L802
o/c |
|
Decca |
160 |
Dead |
loptr s/c, R507/508 12k o/c |
|
Decca |
160 |
Dead - blow up due to
excess HT |
Loptr BU508 & TDA3651
Fop chip s/c - D808 in set ht leaky |
|
Decca |
160 |
field collapse |
TDA3651 field chip u/s |
|
Decca |
160 |
Field collapse |
TDA3651 s/c (TDA3653
does);R411 10R o/c |
|
Decca |
160 |
Field collapse |
R301 560k hi res |
|
Decca |
160 |
field
collapse |
TDA3561 (TDA3563 works) u/s
& R411 10R safety res |
|
Decca |
160 |
int dead |
dry joints Q801 emitter |
|
Decca |
160 |
Int signals |
R007 3k9 |
|
Decca |
160 |
Line Collapse |
C406 0µ39(20"), 0µ33(16")
250v scan coupling cap |
|
Decca |
160 |
No results - whistle/purr
from PSU. |
R508 ( 12k )
o/c left of aerial socket. |
|
Decca |
160 |
Slight ghosting |
Z101 SAWF |
|
Decca |
161 |
Dead - HT supply 400v |
Q501 ZTX651 12v reg, D503
12v zener |
|
Decca |
161 |
No sound or led display |
LL01 choke dry joint |
|
Decca |
162 |
field collapse |
R434 10R safety res o/c no other ff |
|
Decca |
165 |
Chan store inoperative |
Add 10µ 35v cap across
RR34 5k6 |
|
Decca |
165 |
No sound |
TDA4503 chip |
|
Decca |
165 |
Peak white raster |
TDA3565 I501 |
|
Decca |
165 |
Signals low gain |
R102 4k7 o/c |
|
Decca |
165 |
St/by only |
QR06 BF391 s/c, micro
faulty (due to increased supply), R007 & R011 3k9 o/c |
|
Decca |
165 |
St/by only |
Mains sw temp contacts only
0.5v (-15v) - R803/809 82k hi res |
|
Decca |
165 |
Tripping HT constant at
117v |
No line drive as 11.5v
supply missing pins 7 & 22 IC101 - Check R507 & R508 12k |
|
Decca |
170 |
dead |
chopper tr Q801 S2000AF
s/c. Replace C807 100µ, C812 100µ. NOTE:- if run on reduced mains
(120vac) set will trip even tho not faulty |
|
Decca |
170 |
Dead aft storm |
Replace IR02 PCD8572 &
I001 SAB3035 |
|
Decca |
170 |
Intermittent
sync/brill/sound/tuning etc |
Soldered rivets connecting
outer chassis to main pcb dry jointed |
|
Decca |
170 |
Loss of col & lines |
Bad joints edge conn Txt
panel |
|
Decca |
170 |
Low motorboating noise. |
C711 ( 100mf 63v ) takes
our R802 3.3ohm 4watt surge limiter L/H side of PSU. |
|
Decca |
170 |
No sound/led & bright
raster fading away |
6v supply only 2.2v - D811
BA157 leaky |
|
Decca |
170 |
No sound/vis - has chan
display & will change chan - HT present at lop tr |
Dry joints on plug pins
base of vertical scart panel & on RA16 on separate audio panel. |
|
Decca |
170 |
No start up - chan ind ok |
R426/427 1k hi res |
|
Decca |
170 |
NO TUNING FROM COLD ,
OK WHEN WARM |
4Mhz CRYSTAL
X001 |
|
Decca |
170 |
No tuning when cold |
33v ok at pin 17 SAB3035
but no o/p pin 15 - X001 4Mhz Xtal faulty |
|
Decca |
171 |
Line collapse. |
Drys on Lin coil. |
|
Decca |
171 |
No sound. |
Drys on sound IC. |
|
Decca |
171 |
No Tuning - will sweep. |
R004 ( 4.7R )
side of tuner. |
|
Decca |
180 |
Brighter at rh side of
screen |
Check C426 & C508 0µ1 |
|
Decca |
180 |
Chan display only |
HT at lop tr - no 18v pin
15 AV plug (M00-1) 26v ok at pin 1 caused by burnt skt pin 15 - hard wired |
|
Decca |
180 |
Chan display only - no 18v
to reg |
Bad joints pin 15 scart
conn |
|
Decca |
180 |
Dead - chopper tr s/c |
Check 120 & 150k
feedback Rs & 220R res next to chopper tr |
|
Decca |
180 |
instantly blows S2000AF lop
tr Q403 |
C433 6.8nf 2kv in e-w cct
o/c |
|
Decca |
180 |
Low contrast |
120k res under lopt |
|
Decca |
180 |
No sync |
MAB8441P-T049 Txt chip |
|
Decca |
180 |
Pumping psu at switch on |
OK off load - Check
C806/807 100µ 25v & Mains smoother C805 100µ 385v |
|
Decca |
180 |
sound virtually
non-existant |
TDA1524A vol/tone control
chip |
|
Decca |
180 |
Watery pic intermittent or
loss of sound/vis |
Dry joints pin 15 connector
M152 on daughter board |
|
Decca |
185 |
No signals, slow chan
change etc |
No 33v at ZTK33 33v stab -
check R005/6 10k ½w res o/c |
|
Decca |
190 |
Chopper transistor s/c |
Also change R811 470k |
|
Decca |
190 |
dead |
ht at lop tr - no 10 or 17v
o/p from chopper tfmr. Dry joints chopper tfmr |
|
Decca |
190 |
Dead |
R803/3 15k ½w o/c in psu |
|
Decca |
190 |
Dead - no display. |
R802 ( 15k )
o/c by set HT control. |
|
Decca |
190 |
Dead with tripping |
C814 47µ 250v, mains
smoother C808 100µ 385v |
|
Decca |
190 |
Dist sound/pic with
buzz/pulling |
Check adj
of L102 "tank" coil |
|
Decca |
190 |
Grey scale faults |
Check 47k resistors
( 3 on each output
stage ) |
|
Decca |
190 |
Incorrect operation of
front panel controls |
IC702 micro HD401220A02S pt
no 19-8315-6 |
|
Decca |
190 |
Int functions |
Check membrane - pt no's in
TV Mag |
|
Decca |
190 |
Line freq wrong |
R109 30k hi res |
|
Decca |
190 |
Mains
fuse or surge limiter o/c |
Check R812 33k in snubber
network positioning - if too close to heatsink will flash over |
|
Decca |
190 |
No pic - sound ok |
No line drive pin 26
TDA4505 IC101, C111 2n7 timing cap o/c |
|
Decca |
190 |
No pic - sound ok |
R413 18R metal film res in
line dr supply o/c |
|
Decca |
190 |
No sound/raster with
"0" displayed |
Remove switch membrane to
check operation of tv - if ok then membrane u/s |
|
Decca |
190 |
Pic/sound goes out of tune
& pulses after chan change |
Adjust vis det coil L102
(tank) |
|
Decca |
190 |
Reverts to st/by aft 10
secs with whistling |
115v HT rises to 150v in
st/by - R827 47R 4w in psu pri o/c |
|
Decca |
190 |
slow start up |
R803 16k start up res (read
ok out of cct) |
|
Decca |
190 |
Sound lost on chan change |
HD401220 micro pt no
1983156 |
|
Decca |
190 |
Tripping or HT low
( Should be 115v or 109v ) may
start up correctly if scan coils unplugged . |
C803 220uF 16v
( PSU IC supply ) OC. |
|
Decca |
190 |
Tuning drift |
keyboard membrane had
recently been fitted. R005 5R6 never fitted |
|
Decca |
190 |
White raster with fb lines
then partial field coll after which switched off |
R201 8R2 1/2w in RGB feed
o/c |
|
Decca |
C Series |
Volume won't Adj over full
range or no front Panel Op. |
For volume - press --/- on
remote , Vol + on set ,
--/- on remote for no front panel ,
Switch set off , Press & hold P+ on S |
|
Decca |
10 |
Contrast - varying esp
between stations. |
C60 ( 22u f ) |
|
Decca |
100 |
Dead - 3.15a fuse blowing
intermittent. |
D617. |
|
Decca |
100 |
Dead - blowing mains fuse
for no reason. |
Check fuse holder for being
loose or charred. |
|
Decca |
100 |
Dead - EHT overwind burnt. |
LOP transistor + LOPTX +
Tripler. |
|
Decca |
100 |
Dead. |
D600-3 , RBA920 , LOPTX ,
Tripler. |
|
Decca |
100 |
Frame - bottom half of scan
missing. |
D302 ( IN4148 ) |
|
Decca |
100 |
Frame - height reduced
& foldover at bottom. |
D309 , D310 , D311. |
|
Decca |
100 |
LOPTX - can use ITT
CVC25/30 type |
But must do a Mod see Tv
Mag. |
|
Decca |
100 |
Rope effect 1/4" down
screen on RH side. |
TR304 ( BF355 ) |
|
Decca |
100 |
Will not change channels. |
R12 ( 390k ) o/c
on tuner panel. |
|
Decca |
110 |
Dead - blown fuse &
chopper. |
D608 , D610 , C627
( 10uf , 16v ) |
|
Decca |
110 |
Dead - chopper transistor
blowing int. |
R637 ( 2k2 , 7w ) o/c
, DJ on TR604 ( 8SR56 ) |
|
Decca |
110 |
Dead. |
C624 ( 100u f ) |
|
Decca |
110 |
Flyback - brightness varies
& flyback lines. |
R913 ( 22k ) |
|
Decca |
110 |
Red vertical stripes. |
C208 ( 22uf ) . |
|
Decca |
110 |
Red/green/blue with flyback
lines. |
R913 ( 22k ) |
|
Decca |
110 |
Sync - Frame sync poor. |
C308 ( 10uf ) o/c. |
|
Decca |
110 |
Tripping - intermittent. |
Check C617
( 6 8nf ) for leak. |
|
Decca |
110 |
Tripping. |
D602 ( ZPD22 ) leaky
, R636 o/c , C633 ( 680uf )
s/c , IC61. |
|
Decca |
120 |
4 page layout with faults. |
Picture on cover of Tv Mag. |
|
Decca |
120 |
Channel - change
intermittent. |
Focus spark gap on CRT
base. |
|
Decca |
120 |
Cramped frame after 2
hours. |
R813 ( 10k )
set HT control int. |
|
Decca |
120 |
Dead - after 30 mins. |
C406 ( 22uf ) |
|
Decca |
120 |
Dead - fuse o/c chopper
transistor s/c. |
Change R808 & R810
( high ) |
|
Decca |
120 |
Dead - Q801 failed. |
Q801 , R808
( 47u f ) , R810
( 150u f ) |
|
Decca |
120 |
Field cramp after a couple
of hours |
R813 ( 10K ) o/c |
|
Decca |
120 |
Frame collapse. |
D404 ( BA159 ) ,
R434 ( 10 )
, TDA1170 ) |
|
Decca |
120 |
Frame collapse. |
IC301 ( TDA1170S )
s/c , R434 ( 10R ) o/c. |
|
Decca |
120 |
Line hold critical -
wavering at top of pic. |
IC TDA2576A , C406 ( 22uf
16v ) |
|
Decca |
120 |
Loss of colour. |
R226 , R244 , R251 high. |
|
Decca |
120 |
No colour. |
C517 ( 100nf )
leaky. |
|
Decca |
120 |
No luminance. |
C514 ( 100nf )
leaky. |
|
Decca |
120 |
No tuning - uncontrollable
high sound. |
Tripler! |
|
Decca |
120 |
Poor contrast - control has
no effect. |
R425 , R426 ( 68k )
high. |
|
Decca |
120 |
Sync - line apift then
dead. |
C406 ( 22uf ) |
|
Decca |
120 |
Tuning - no signals
( int ) on some ch
only. |
RM17 ( 560k ) high. |
|
Decca |
120 |
Tuning - no signals snow. |
RM17 ( 560k ) o/c. |
|
Decca |
120 |
Tuning - no signals. |
BF959 ( IF pre amp ) o/c. |
|
Decca |
120 |
Uncontrollable high sound -
whistle from LTB. |
Tripler! |
|
Decca |
120 |
Will not switch to standby
via remote control |
IC SAA1351. |
|
Decca |
120/30 |
BEAM LIMIT FAULT ,
CONTRAST WEAK. |
R425 R426 both
( 68K ) |
|
Decca |
125 |
Cramped frame after 2
hours. |
R813 ( 10k )
set HT control int. |
|
Decca |
125 |
Frame collapse. |
IC301 ( TDA1170S )
s/c , R434 ( 10R ) o/c. |
|
Decca |
125 |
Line hold critical -
wavering at top of pic. |
IC TDA2576A , C406 ( 22uf
16v ) |
|
Decca |
125 |
No colour. |
C517 ( 100nf )
leaky. |
|
Decca |
125 |
No luminance. |
C514 ( 100nf )
leaky. |
|
Decca |
125 |
Poor contrast - control has
no effect. |
R425 , R426 ( 68k )
high. |
|
Decca |
125 |
Will not switch to standby
via remote control |
IC SAA1351. |
|
Decca |
130 |
Channel - change
intermittent. |
Focus spark gap on CRT
base. |
|
Decca |
130 |
Dead. |
C816 ( 100u f ) o/c. |
|
Decca |
130 |
Faint picture - sound ok. |
Caps fitted in error in pos
R226 , R244 , R251. |
|
Decca |
130 |
Flyback - lines on bright
picture. |
Change R436 & check
C427 |
|
Decca |
130 |
Green picture -
intermittent. |
100k resistors on crt base. |
|
Decca |
130 |
Grey scale varying. |
Check R226 , R244 , R251
( 100k ) may be high. |
|
Decca |
130 |
Standby - Going into when
changing channels. |
Standby transformer o/c
winding. |
|
Decca |
130 |
Tripping |
R186 |
|
Decca |
130 |
Tuning - intermittent on
some ch only no sigs |
RM17 ( 560k ) high. |
|
Decca |
130 |
Tuning - no signals - snow. |
RM17 ( 560k ) o/c. |
|
Decca |
130 |
Tuning - no signals. |
BF959 ( IF pre amp ) o/c. |
|
Decca |
135 |
Tuning - drifting off tune
when warm. |
R68 ( 33k ) going
high. |
|
Decca |
140 |
Colour - dropout -
intermittent. |
Q211 & Q203. |
|
Decca |
140 |
Dead |
R805 390K OC. |
|
Decca |
140 |
Dead - after 5 mins. |
C813 lead broken. |
|
Decca |
140 |
Dead - fuse f801 blown. |
Q801 s/c , C425
( 8.2nf or 8.6nf ) ,
Dry D811. |
|
Decca |
140 |
Dead - no 18v rail. |
D811 check if lead is
through board. |
|
Decca |
140 |
Dead. |
Crack in print between D805
& D802. |
|
Decca |
140 |
FIELD BOUNCE |
POOR CONNECTION AT PIN 8
M501 |
|
Decca |
140 |
Field roll with hold
control at one end |
R423 ( 2M2 ) o/c |
|
Decca |
140 |
Flickering LED display - no
remote control. |
DJ where connected to 5v
line on display panel. |
|
Decca |
140 |
Flyback - lines on bright
picture. |
Change R436 & check
C427 |
|
Decca |
140 |
Frame - lack of height -
field roll. |
R423. |
|
Decca |
140 |
Int frame roll - preset up
one end. |
R423 ( 2.2R
) |
|
Decca |
140 |
Loud hum at switch on. |
C808 & C810
( 100u f , 25v ) |
|
Decca |
140 |
No functions - HT ok. |
R817 ( 220R
safety ) o/c. |
|
Decca |
140 |
No picture. |
R817 ( 220R
) o/c. |
|
Decca |
140 |
Not tuning in. |
68 ( 33k )
, R003 ( 13k ) , 70 ( 33k ) o/c. |
|
Decca |
140 |
Pic goes red int |
R224 ( 1K ) preset |
|
Decca |
140 |
PICTURE GOES TO SNOW AND
SOUND COMES UP LED CHANNEL |
DRY JOINTS ON 5v RAIL OR ON
CHOPPER TX |
|
Decca |
140 |
Remote control -
none+flickering LED display. |
DJ where connected to 5v
line on display panel. |
|
Decca |
140 |
Standby - no switch on from
standby. |
IC SAA1351 , the tripler
may be to blame. |
|
Decca |
140 |
Taking up to 2 mins to come
on. |
Check 2 by 100uf 25v cons ,
& 1 by 100k res adj to TDA4600. |
|
Decca |
140 |
Tripping - recycling. |
Mica washer breaking down. |
|
Decca |
140 |
Tuning - no signals. |
BF959 ( IF pre amp ) o/c. |
|
Decca |
140 |
Tuning - no tuning. |
70 ( 33k ) o/c. |
|
Decca |
140 |
Verticals ragged. |
HT & smoothing cons
C822 , C826 both 47uf , 250v. |
|
Decca |
141 |
Frame - roll - control up
one end. |
R423 ( 2.2M 1/2w ) |
|
Decca |
145 |
Dead - blowing chopper
transistor. |
R808 ( 100k ) &
R810 ( 82k ) |
|
Decca |
145 |
NO PIC HUM ON SOUND |
C808 100uF |
|
Decca |
145 |
Stuck in standby. |
R802 , 809
82k OC |
|
Decca |
145 |
TUNING DRIFT |
M293AB1 IR03 TUNING VOLTAGE
SYNTHESISER |
|
Decca |
