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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: 442
Decca
A
St/by light goes out but set does not come on
LM317 12v reg dry joints
14-09-04
Decca
A Series
Dead
R802 R803 ( 15K )
14-09-04
Decca
A Series
Dead with squeal
Dry joints R808 ww resistor
14-09-04
Decca
A Series
No remote operation
IR Rx faulty
14-09-04
Decca
A Series
Varying HT
Dry joints R808 ww resistor
14-09-04
Decca
B
dead
Pin 7 IC801 low D807 1N4148 u/s
14-09-04
Decca
B
No line or field sync - video at pin 5 TDA2579A TB Gen IC401
IC703 EEPROM crashed due to possible arcing around spark gap - reprog - replacement unnec
14-09-04
Decca
B
dead with st/by led flashing
D810 BY399 leaky - feedback cct assoc with chopper FET Q801
14-09-04
Decca
B Series
Line whistle - mod reqd
Add 220pf cap to pin 5 & pin 6 of opto IC802 in psu
14-09-04
Decca
B Series
Loses register 7 (line osc free run)
Dry joints 27Mhz Xtal on Txt pcb
14-09-04
Decca
B Series
To enter electronic screwdriver settings
Move jumper link by proc to other posn. No. in lh of screen is parameter & can be stepped thro' in Hex from 00 to 12 using "3" button (up) & "2" button (down). Parameters changed by using "Balance left & right"
14-09-04
Decca
C Series
childlock on
sw on tv whilst holding in 'P+' button on front
14-09-04
Decca
C Series
Cuts out on high brightness scenes
HT volts drops in sympathy - CE803 220µ 16v ( supply to TDA4605)
14-09-04
Decca
C Series
Field collapse
dry joint I402
14-09-04
Decca
C Series
int trip - once or twice a day
worse when heated - - TDA4605 heat sensitive - u/s
14-09-04
Decca
C Series
Line down pic when cold (folded scan)
R413 18R ?w hi res - check HT correct -115v 14/20"; 109.5v 15/21"
14-09-04
Decca
C Series
No R/C operation
No o/p from r/c chip IC750 Replace TFMS4360N with TFMS5360
14-09-04
Decca
C Series
St/by LED on - otherwise dead
Dry joint on end pin SCART skt depriving line feed to dr tfmr
14-09-04
Decca
C Series
st/by only
HT (B+) present - on/off sw perm made - was faulty
14-09-04
Decca
C Series
Stuck on Chan 1 & no analogue control (Child Lock)
Hold "Prog +" whilst switching on
14-09-04
Decca
CV9371
Dead - F802 o/c
BU426A chopper s/c; R808 150k hi res; C814 1µ o/c & chech TDA4600
14-09-04
Decca
D
green pic - loss of B drive
R922 100k feedback/bias could affect other cols (R932/912)
14-09-04
Decca
D
Locked on 1 chan & vol at max
EEPROM corruption - to reset factory values s/c pins 1 & 2 PC701 near µ (whilst tv is on) & press any button on front panel. Tv will go to st/by allowing adjustments to be made next time switched on
14-09-04
Decca
D
No pic short squeal at sw on
R427 22R .5w in line drive
14-09-04
Decca
D Series
All red.
R012 100k on CRT base.
14-09-04
Decca
D Series
Bright Green Raster
Green cathode volts low - Tr931 BC547 o/c & R932 100k hi res
14-09-04
Decca
D Series
field collapse
R504 3M3 faulty - feeds ramp to pin 42 IC503 TDA8362
14-09-04
Decca
D Series
Lack of height
Check 33v supply IC001 TAA550 & feed res R015/6 6k8 & R504 3M3
14-09-04
Decca
D Series
Line foldover with crt heaters dimming
R427 line feed res high res
14-09-04
Decca
D Series
No Field Scan
If IC401 & R414 are OK check R504 3M3 ohm
14-09-04
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