TV
Repair Database
|
ITT |
Digi |
At switch on EHT rises then
falls. |
R754 high. |
|
|
ITT |
Digi |
Blank raster. |
T610 , VCU IC650. |
|
|
ITT |
Digi |
Brightness at max & fly
back lines. |
Zenor 5.1c s/c , zener in
R603 pos instead of 470pot. |
|
|
ITT |
Digi |
Brightness intermittent. |
D403. |
|
|
ITT |
Digi |
Contrast - picture has low
contrast. |
T1013 leaky , R1018
slightly high. |
|
|
ITT |
Digi |
Dead - blowing BU. |
D703 leaky in bridge recy. |
|
|
ITT |
Digi |
Dead - faint whistle. |
Remove scan plug if loud
whistle change LOPTX & ST2000A |
|
|
ITT |
Digi |
Dead. |
DPU IC620 faulty , IC3006
TDA2040 audio IC. |
|
|
ITT |
Digi |
Dead. |
T561 , T563 , D513 all s/c. |
|
|
ITT |
Digi |
Flyback lines - brightness
at max. |
Zener 5.1c s/c , zener in
R603 pos instead of 470pot. |
|
|
ITT |
Digi |
Grey scale will not set up
- picture red. |
T1033 tube base blue drive. |
|
|
ITT |
Digi |
No picture ,
sound or channel display. |
T742 , F701. |
|
|
ITT |
Digi |
No sound |
Speaker o/c. |
|
|
ITT |
Digi |
Picture has poor
definition. |
VCU IC650 faulty. |
|
|
ITT |
Digi |
Raster - green raster &
flyback lines. |
T1023 leaky , R1027 burnt. |
|
|
ITT |
Digi |
Red picture - grey scale
will not set up. |
T1033 tube base blue drive. |
|
|
ITT |
Digi |
Snowy raster. |
IC1402 ( MEA2901 ) |
|
|
ITT |
Digi |
Sound - crackle when on
hyposound. |
IC670 on digi board APU
2400E. |
|
|
ITT |
Digi |
Sound - no sound ,
picture or channel display. |
T742 , F701. |
|
|
ITT |
Digi |
Sound - no sound on one
channel. |
APU IC670 faulty. |
|
|
ITT |
Digi |
Sound - no sound or vision. |
R519 burt up due to D513 ,
check T561/2/3. |
|
|
ITT |
Digi |
Sound - varies. |
ICx2 ( APU ) on
digi PCB. |
|
|
ITT |
Digi |
Sound - will not adj
correctly. |
Memory IC on front unit
?????07 |
|
|
ITT |
Digi |
Teletext - incorrect. |
TPU IC640. |
|
|
ITT |
Digi |
Teletext - no teletext. |
TPU IC640. |
|
|
ITT |
Digi |
Text - information
displaced. |
TPU IC640. |
|
|
ITT |
Digi |
Text - no text. |
D403. |
|
|
ITT |
Digi 3 |
At sw on whisles, display
lights for a sec then electronic fuse operates |
OK on dummy load - s/c
across -13v supply - D547 BA158, TDA2170 Field o/p chip IC401 & C548
1000µ16v s/c |
|
| ITT |
Digi 3 |
Blank raster |
VCU2100A codec chip IC650 on digi board |
|
| ITT |
Digi 3 |
Col incorrect |
IC630 PVPU2200 or Xtal X610 |
|
| ITT |
Digi 3 |
Colour faulty - osc off
freq effect |
IC610 clock gen chip |
|
|
ITT |
Digi 3 |
COMES ON AT SWITCH-ON GOES
STRAIGHT OFF SMELLS OF Burning? |
FIELD OP IC SC TDA2170 |
|
|
ITT |
Digi 3 |
COMES ON FOR 5secs THEN
GOES DEAD |
D547 SC IC401 TDA2170 SC
C548 SC |
|
| ITT |
Digi 3 |
Crackling sound in Hyposound mode |
APU2400E IC670 on digiboard |
|
| ITT |
Digi 3 |
Dead |
D795 s/c |
|
| ITT |
Digi 3 |
Dead |
Check chopper tr T742; DPU2540 deflection proc chip can
drive LOP at wrong freq |
|
| ITT |
Digi 3 |
Dead - chopper tr blows |
Bridge rects D703-6 req
changing |
|
| ITT |
Digi 3 |
Dead - HT low |
C535 1nF s/c |
|
| ITT |
Digi 3 |
Dead - R519 burnt |
Replace D513 BY448 |
|
| ITT |
Digi 3 |
Dead - tripped |
Check D547 & 8 (+/- 13v
rects) |
|
|
ITT |
Digi 3 |
dead - trips once at sw on |
LOP Tr S2000 (BU508A) leaky
c-e. NOTE when run on dummy load HT is only 110v (145v) - this is normal |
|
|
ITT |
Digi 3 |
Dead. |
T738 s/c , C714 ( 10uf 50v
) o/c , C712 ( 10uf 400v ) s/c. |
|
| ITT |
Digi 3 |
Field faulty |
IC771 L78S05CV 5v reg |
|
| ITT |
Digi 3 |
Field non lin |
D411 6v8 zener |
|
|
ITT |
Digi 3 |
Flyback lines at top |
C402,[100mf,25v] |
|
|
ITT |
Digi 3 |
Flyback lines at top of
picture. |
C402 ( 100uf 25v ) |
|
| ITT |
Digi 3 |
Horizontal lines on pic |
MEA2901 tuner interface chip IC1403 on control panel |
|
|
ITT |
Digi 3 |
instability for first 10
mins |
replace electrolytics in IF
can |
|
|
ITT |
Digi 3 |
INT BLACK BARS AND RANDOM
SCREEN BLANKING |
VCU2100A
IC650 ON DIGITAL PCB |
|
|
ITT |
Digi 3 |
Int green picture. |
Drys on IC650
( teletext PCB ) . |
|
|
ITT |
Digi 3 |
Int line sync |
C209 in module |
|
| ITT |
Digi 3 |
Int no col |
MCU2600 IC610 |
|
| ITT |
Digi 3 |
Int st/by |
IC1405 5v reg on control panel |
|
|
ITT |
Digi 3 |
Int start up - esp from
cold |
C714 faulty |
|
|
ITT |
Digi 3 |
Int start up or dead |
Dry joints st/by tfmr |
|
| ITT |
Digi 3 |
Line at top of screen |
R431 330R |
|
|
ITT |
Digi 3 |
LINE FAULT AT SWITCH ON
THEN PATTERNING AFTER 2min |
C209 47uF C234 10uF IN IF
UNIT |
|
|
ITT |
Digi 3 |
LINE FAULT AT SWITCH ON
THEN PATTERNING AFTER 2min |
C209 47uF C234 10uF IN IF
UNIT |
|
| ITT |
Digi 3 |
Line phase faults |
C209 & C234 in hf
module & check for dry joints in the module |
|
| ITT |
Digi 3 |
No col |
IC1402 memory chip on
control panel |
|
| ITT |
Digi 3 |
No sound/pic |
IC3004 video switch chip on
interface/audio panel |
|
| ITT |
Digi 3 |
No sound/pic - EHT present |
D771 s/c |
|
| ITT |
Digi 3 |
Noisy pic with low gain |
IC1402 memory chip on control panel |
|
|
ITT |
Digi 3 |
Patterning after a minutes
operation |
C209 47µ & C234 10µ
in hf module |
|
| ITT |
Digi 3 |
Pic shifted down |
D411 6v8 zener |
|
| ITT |
Digi 3 |
Poor start up |
C714 10µ |
|
| ITT |
Digi 3 |
R/C int operation |
T1410 on control panel |
|
| ITT |
Digi 3 |
R/C int or changes chan by itself |
Mod - fit 10k res between pin 6 of R/C IR chip to chassis |
|
| ITT |
Digi 3 |
Resolution poor |
VCU2100A codec chip IC650 on digi board |
|
|
ITT |
Digi 3 |
Set shuts down immediately
at switch on. |
IC401 ( TDA2170 frame IC )
, D545/547 ( BA158 ) s/c. |
|
| ITT |
Digi 3 |
Shaking pic - like line phase shift |
IC1402 in IFB286 module |
|
|
ITT |
Digi 3 |
Snowy picture with
interference lines. |
Cracked solder from edge of
PCB to tuner can. |
|
|
ITT |
Digi 3 |
SOUND CRACKLES ON HYPOSOUND |
IC670 APU2400E |
|
| ITT |
Digi 3 |
Sound faulty |
APU2400E IC670 Audio proc chip |
|
| ITT |
Digi 3 |
Trips int |
R754 160k changed value |
|
| ITT |
Digi 3 |
Tuning inoperative |
MEA2901 tuner interface chip IC1403 on control panel |
|
| ITT |
Digi 3 |
Txt corrupt |
IC640 TPU2732 |
|
| ITT |
Digi 3 |
Txt info displaced |
IC640 TPU2732 |
|
| ITT |
Digi 3 |
Txt inoperative - indicator
works |
D403 1N4148 |
|
|
ITT |
Digi 3 |
Unlocked col when cold |
MCU2600 clock gen |
|
| ITT |
Digi 3 |
Unstable pic |
IC620 DPU2540 deflection
proc |
|
| ITT |
Digi 3 |
Vertical lines has squegging |
IC650 video codec chip |
|
| ITT |
Digi 3 |
Weak pic |
T1013 BF493 feedback tr on crt base |
|
|
ITT |
Digi 3 |
WHISTLES ,
CHAN IND LIGHTS THEN ELEC FUSE OPERATES |
CHECK FIELD STAGE - D547 ,
TDA2170 , C548 |
|
| ITT |
Digi 3 110deg |
Dead with st/by light flashing |
TDA2170 field o/p chip s/c |
|
| ITT |
Digi 3 110deg |
No sound/raster - ok on dummy load |
D547 in 13v supply s/c & FOP chip TDA2170 IC401 s/c |
|
|
ITT |
Digi B |
Dead or int dead/ reverts
to st/by etc |
Mains I/p choke dry joints |
|
|
ITT |
Digi-3 |
Colour - colours not
correct. |
X610 17m7 hz crystal faulty
, PVPU IC630 faulty. |
|
|
ITT |
Digi-3 |
Frame - blank line at top
of picture. |
R431 o/c. |
|
|
ITT |
Digi-3 |
Frame - height reduced at
top - bottom ok. |
D411 ( ZTK 6.8 zenor ) breaking
down. |
|
|
ITT |
Digi-3 |
Horizontal bars over
picture. |
IC1403 tuner inteface IC. |
|
|
ITT |
Digi-3 |
Line sync pulling. |
C209 ( 47uf ) ,
C234 ( 10uf ) in HF module. |
|
|
ITT |
Digi-3 |
No or intermittent remote
control. |
Fit a 10k res between pin 6
and chassis IC404 |
|
|
ITT |
Digi-3 |
Patterning effect. |
C209 ( 47uf ) ,
C234 ( 10uf ) in HF module. |
|
|
ITT |
Digi-3 |
Picture shifted half way
down. |
Replace D411. |
|
|
ITT |
Digi-3 |
Picture unstable when warm. |
DPU IC faulty. |
|
