TV
Repair Database
|
Hitachi |
G6P |
BLANK RASTER ,
NO SOUND |
C933 2200mfd , 25v
ALSO CHECK 12v REG OP. IC932 |
| Hitachi |
G6P |
Blank raster, no sound |
IC932 12v reg o/p low, C933
2200µ 25v |
|
Hitachi |
G6P |
Blank white raster with fb
lines |
Q301 2SA673C s/c,replacement
restored pic but no OSD & red fb lines; M50450-023P micro |
|
Hitachi |
G6P |
Bright green
raster with flyback lines. When
the |
A new cbip
restored everything to normal. |
| Hitachi |
G6P |
Bright white raster - only
20v at RGB colls |
ZD301 12v zener on main pcb |
| Hitachi |
G6P |
Bright white raster which
trips aft 30 secs |
R771 o/c & D763 leaky
in RGB supply |
|
Hitachi |
G6P |
Colour - looks a bit pale. |
Q856 ( 2SC2271 ) |
| Hitachi |
G6P |
Colour int goes off |
IC501 HA51338SR pin never soldered |
| Hitachi |
G6P |
Corrugated verts |
C905 & C910 4µ7 50v |
| Hitachi |
G6P |
Dark pic with red flaring |
Low A1 volts caused by contamination on crt base pcb |
|
Hitachi |
G6P |
Dead |
Q901 or dry joints on
heatsink tag for T721 |
| Hitachi |
G6P |
Dead - low res between base
- emitt of Chopper transistor Q901 |
CP901 control/drive module
HM9205 has s/c between pins 5 & 6 |
|
Hitachi |
G6P |
Dead - momentary crack from
spkr & led briefly flashes |
OK on dummy load - LOPTx
faulty |
|
Hitachi |
G6P |
Dead after dying whine at
sw on |
dry joints line driver tfmr
T721 lands |
|
Hitachi |
G6P |
DEAD LINE TR READS SC OR
LOW B-E ( Q901 ) |
CP901 HM9205 SC PINS 5 , 6 |
|
Hitachi |
G6P |
Dead with whine |
HT low at 50v on dummy load
- LOPTx s/c winding |
| Hitachi |
G6P |
Dead without whistle |
D902 ES1A s/c in psu |
|
Hitachi |
G6P |
Dead, st/by LED OK, HT at
40v on dummy load |
C914 1000µ 16v |
|
Hitachi |
G6P |
Excess brill with fb lines |
ZD301 12v leaky across lum
feed to crt panel |
| Hitachi |
G6P |
Fail to start up - int |
Dry joint R1172 1k between pin 38 of micro & Q1103 coll |
| Hitachi |
G6P |
Field cramp |
C682 100µ 50v |
|
Hitachi |
G6P |
Field top foldover |
C682 100µ 50v |
|
Hitachi |
G6P |
GOES STRAIGHT TO STBY |
R902 903 82k
HIGH OR OC |
|
Hitachi |
G6P |
Going to standby at switch
on. |
R902/3 ( 82k ) high. |
|
Hitachi |
G6P |
GREEN FLASHES ON PICTURE |
REPLACE OSD ID |
| Hitachi |
G6P |
Green flashing pic with
green fingers reaching out from left |
Caption/on screen display
gen chip IC1104 M50450-023P |
|
Hitachi |
G6P |
Int cuts out after trying
to start |
2D752 24v zener |
|
Hitachi |
G6P |
Int dead no ht |
EHT sensing diode ZD752
slight reverse leak - 24v zener |
| Hitachi |
G6P |
Int start up |
C911 2µ2 50v non pol cap
in psu |
|
Hitachi |
G6P |
INT STICKS IN STBY |
R1172 DRY BETWEEN PIN 38
MICRO AND Q1103 |
| Hitachi |
G6P |
Light horizontal bar at top
of pic |
CP901 chopper drive chip |
| Hitachi |
G6P |
Line jitter at top of
screen when using vcr |
Change R706 & R716 to
5k6 |
|
Hitachi |
G6P |
No graphics - teletext ok. |
Q858/Q857 on CRT base ,
D1113/D1114 , IC1104. |
|
Hitachi |
G6P |
NO MEMORY IC1102 NO -30v |
R772 1k2 |
|
Hitachi |
G6P |
No pic - cut off due to
field collapse |
R715 1R o/c feed to Field
o/p chip TDA3654 - no other ff |
|
Hitachi |
G6P |
No sig Just sound OSD ok |
IC1101 M5043255 |
| Hitachi |
G6P |
No signals, osd or controls |
IC1101 M50432551SP micro faulty - no movement on data lines |
|
Hitachi |
G6P |
No tune store |
R772 1k2 o/c |
| Hitachi |
G6P |
Only left hand 3" of
pic visble - rest blanked |
C782 2n2 2kv tuning cap |
| Hitachi |
G6P |
Pale colour |
Q856 2SC2271 col diff tr on crt base leaky |
|
Hitachi |
G6P |
PICTURE COMES ON ALL WHITE
THEN SET TRIPS OFF |
R771 OC
D763 SC |
| Hitachi |
G6P |
Red vert bands gradually filling screen |
IC1104 M50450-023P graphics gen chip |
| Hitachi |
G6P |
Shut down aft a couple of secs of sw on |
Crowbar thyristor Q902 firing - ok if gate dis'd - ZD752
24v in EHT sensing leaky |
|
Hitachi |
G6P |
Shutdown - after couple of
seconds. |
ZD752 ( 24v zener ) leaky. |
|
Hitachi |
G6P |
SNOW ON SCREEN NO OSD |
IC1101 MICRO IC |
| Hitachi |
G6P |
Sound level varies |
Stab
12v line varies - ZD791 HZ11LC2 in Q791 base cct |
| Hitachi |
G6P |
Sound poor & int |
IC201 HA11485NT in IF unit dry joints |
|
Hitachi |
G6P |
Sync poor or non existant |
C701 100µ 25v |
| Hitachi |
G6P |
Tripping effect - line
drive pulsing |
Check C1101 2µ2 |
|
Hitachi |
G6P |
TRIPS HT COECT AT 110v
IC501 PIN 24
( START U |
C1101 ( MICRO
RESET )
US |
|
Hitachi |
G6P |
Txt lines at top of pic |
IC681 µPC1378H |
| Hitachi |
G6P |
Txt missing or int |
12v I/p to oin 2 PL1204 on
txt pcb low at 10.5v; R761 1R = 5R |
|
Hitachi |
G6P |
VARYING SOUND LEVEL |
ZD791 ZENER HZ11LC2
IN Q791 BASE CIRCUIT |
| Hitachi |
G6P |
Whistling psu - esp on bright scenes |
C909 220µ 160v HT smoothing cap low cap |
| Hitachi |
G6P |
Won't memorise chans |
No -30v to IC1102 - R772
1k2 hi res |
| Hitachi |
G6P Txt |
Sync missing |
IC2110 HA17085 5v reg on txt pcb giving out only 2.5v &
faulty |
|
Hitachi |
G7 PS2 |
Int colour |
R501 1k5 o/c - also check
R502 1k5 |
|
Hitachi |
G7/8QP |
BUZZ ON SOUND |
C410 ( 0.01uF ) or
IC201 TA8691N Pt No. T900486 |
|
Hitachi |
G7/8QP |
Dead |
R902 903 82k OC |
|
Hitachi |
G7/8QP |
GREY RASTER WITH FLYBACK
LINES , WHITE LINE FROM TO |
C711 ( 47mfd , 200v
) |
|
Hitachi |
G7/8QP |
INT GOES OFF |
C711 DRY |
|
Hitachi |
G7/8QP |
Low sound with buzzing |
C410 ( 0.01uF ) Between
MF402 & chassis |
|
Hitachi |
G7/8QP |
NO ON SCREEN DISPLAY |
R008 470k OC. OR DRY |
|
Hitachi |
G7/8QP |
Screen goes very bright
then trips. |
C711 ( 47u f ) |
|
Hitachi |
G7/8QP |
SET APPEARS DEAD BUT IS IN
PROTECTION MODE AS HT T |
R909 39k HIGH |
|
Hitachi |
G7/8QP |
Set Dead H.T. high &
tripping |
Replace ZD903 & R909
( 39K ) |
|
Hitachi |
G7/8QP |
Sound cuts out every few
mins |
C711 D/J |
|
Hitachi |
G7/8QP |
SOUND GREY RASTER WITH
FLYBACK LINES OR SET TRIPS |
C711 47uF 200v NEAR LOPT |
|
Hitachi |
G7/8QP |
Sound ok only gray raster
with line at top & botto |
C711 ( 47uF ) |
|
Hitachi |
G7/8QP |
Stuck in standby - 300v on
BUT collector. |
R902/3 ( 82k ) front
L/H corner o/c. |
|
Hitachi |
G7/8QP |
WHITE SCREEN |
REFIT C171 |
| Hitachi |
G7P |
Bent verts at top when
playing tapes |
Try changing C104 to 22µ
& C205 to 4µ7 - if this makes no difference, reduce C701 to 3n3 &
C702 to 0µ47 50v (unofficial) |
|
Hitachi |
G7P |
Black lines across screen
& int field collapse |
dry joints field o/p chip
IC601 |
|
Hitachi |
G7P |
COMES ON BRIGHT THEN TRIPS
OFF |
Q801 BC558 OR ZD804 9v1 |
|
Hitachi |
G7P |
Crowbar operates aft 5 secs
aft Loptx replacement |
ZD703 faulty - measured ok
out of cct |
| Hitachi |
G7P |
Cuts out aft half hour |
Prot thy triggers due to
Q704 BF432 leaky when warm |
|
Hitachi |
G7P |
CUTS OUT INT |
R919 920 100k |
|
Hitachi |
G7P |
Dead |
CHECK R901
( 3R9 ) 7W C919
( 4.7nF ) 1Kv
AND C928 ( 2.2nF ) 2Kv
R932 R931 ( 100K ) Q901
( BUT11 ) D904 |
|
Hitachi |
G7P |
Dead |
CHECK DIODE ACROSS BASE
EMITTER OF CHOPPER TRANSISTOR |
|
Hitachi |
G7P |
dead |
LOP tr 2SD1884 s/c - use
correct type |
| Hitachi |
G7P |
Dead - HT low at 26v until LOP stage dis'd |
D905 MPG06J leaky |
|
Hitachi |
G7P |
Dead - mains fuse o/c -
chopper tr s/c |
Check R931 150k & R932
120k |
| Hitachi |
G7P |
Dead int & blows chopper tr |
R932 220k to pin 4 TDA4601 hi res |
|
Hitachi |
G7P |
DEAD SURGE LIMITER O/C 3R9
7W Q901 OK |
C919 4n7 1kv SC |
|
Hitachi |
G7P |
DEAD WITH ONLY 33v AT LINE
OP. COLL. |
CHECK MAIN SMOOTHING 150mfd
400v C909 |
|
Hitachi |
G7P |
Dead/Int - blowing chopper
transistor. |
R932 gone high connected to
pin 4 IC901. |
|
Hitachi |
G7P |
Field collapse |
Replace R719 o/c with wire
link |
|
Hitachi |
G7P |
Flashing pic - worse when
tapped |
IC703 9v reg dry joints
(could not be seen) |
| Hitachi |
G7P |
Hum Bar |
Slight adj of AGC preset |
| Hitachi |
G7P |
Int cuts out or dead |
R919 & R920 100k feed pin 5 TDA4601 hi res |
| Hitachi |
G7P |
Int fails to start |
Check C914 2µ2 50v, C916
33µ 25v |
|
Hitachi |
G7P |
Int start up |
C912 4n7 across TDA4600
faulty |
| Hitachi |
G7P |
Nicam poor with clicking |
Adj coil L5 on panel between Txt & Nicam boards |
|
Hitachi |
G7P |
No line sync - pic
displaced to right |
No line pulses IC701 pin12
- R726 2R2 o/c (also check R605) |
|
Hitachi |
G7P |
NO MEMORY STORE |
CHECK R173 , R174 , R723 |
|
Hitachi |
G7P |
NO PIC JUST SNOW ,
NO CONTROLS OR REM WORK |
IC601 FIELD CHIP AN5521
( CHECK FOR FIELD
PULSES AT PIN 15 OF IC101 ) |
|
Hitachi |
G7P |
NO TUNING |
R138 ( 10k ) OC. |
| Hitachi |
G7P |
No Txt - P100 only |
C2109 820pf |
|
Hitachi |
G7P |
Set dead H.T. high &
tripping |
ZD903 & R909
( 39K ) |
|
Hitachi |
G7P |
Set dead many semis in PSU
s/C |
Replace Q903 Q904 : R909
R912 R902 R903 R760 R761 R762 R766 R901 : ZD903 Check Q781 & D782
Replace 2.2ohm across Q760 |
|
Hitachi |
G7P |
Sometimes starts then cuts
out after few mins |
R919 , R920 ( 100k )
feed to TDA4601 gone high. |
| Hitachi |
G7P |
St/by only after trying to
start |
s/c across 27v rail as
IC601 TA8427K is s/c |
| Hitachi |
G7P |
Txt missing |
Xtal X2231 in txt cct |
| Hitachi |
G7P |
Won't store chans |
D706 & R723 in lop
stage dry jointed or faulty |
|
Hitachi |
G7P Mk2 |
Blank white raster. |
C711 dry jointed by LOPTX. |
|
Hitachi |
G7P Mk2 |
buzz on sound - flat pic |
vid det coil L202 |
| Hitachi |
G7P Mk2 |
Dead |
TDA4601 chopper chip - also
replace C914/5/6/7 |
| Hitachi |
G7P Mk2 |
Dead |
|
| Hitachi |
G7P Mk2 |
Dead - HT high |
X ray prot operating due to R716 51k res dry jointed |
| Hitachi |
G7P Mk2 |
Dead R901 3R9 7w surge lim
res o/c |
C919 4n71kv leaky &
check C928 2n2 2kv |
| Hitachi |
G7P Mk2 |
Dead with only 33v HT at LOPtr |
C909 150µ 400v mains smoothing cap o/c |
| Hitachi |
G7P Mk2 |
Field bounce or st/by only |
IC703 MC7809 9v reg dry
jointed or faulty |
| Hitachi |
G7P Mk2 |
FOP chip has short life |
Check HT is not too high -
if so U know what to do! |
| Hitachi |
G7P Mk2 |
Goes off aft half an hour |
Dry joints C711 47µ 200v |
| Hitachi |
G7P Mk2 |
Green raster with flyback
lines |
R808 22k ¼w o/c |
| Hitachi |
G7P Mk2 |
grey raster with fb lines |
C711 47µ 200v bulging & faulty by LOPTx |
|
Hitachi |
G7P Mk2 |
int pic size/ht |
C906 4µ7 250v |
| Hitachi |
G7P Mk2 |
Mass of lines at centre of
screen |
Comes/goes with board flex
- C702 dry joints - near IC701 FOP chip |
|
Hitachi |
G7P Mk2 |
NO GO |
R920 100k OC |
|
Hitachi |
G7P Mk2 |
no sound or pic - ht ok |
field collapse. No 9v to
field chip as MC7809 IC703 o/c |
| Hitachi |
G7P Mk2 |
No start up |
C911 82pf across pins 2 & 3 TDA4601 psu chip |
|
Hitachi |
G7P Mk2 |
no tuning |
R044 12k 0.5w o/c ZD002 30v
tuning volts diode o/c |
|
Hitachi |
G7P Mk2 |
off |
R901 6R8 5W o/c BUT12AF
chopper tr s/c ZD903 180v over volts diode ZD903s/c |
|
Hitachi |
G7P Mk2 |
off with smoke |
C919 4n7 1kv & C928 2n2
1kv cracked cases |
| Hitachi |
G7P Mk2 |
Pic blanks out int or goes
bright & trips |
C711 47µ 200v dry jointed
by LOPTx |
| Hitachi |
G7P Mk2 |
Reverts to st/by aft few
mins |
HT gone high as C906 4µ7
250v is faulty |
| Hitachi |
G7P Mk2 |
Snowy raster & no
controls work |
pin 15 IC101 micro high
-caused by faulty IC601 AN5521 FOP chip |
| Hitachi |
G7P Mk2 |
Tuning drift & nothing
tuneable above Ch36 |
Only 7v across 33v zener.
IC101 HD401304R12S faulty |
|
Hitachi |
G7P Mk2 |
Won't start up again aft
being switched off |
R913 100R in base of
chopper tr o/c |
|
Hitachi |
G7P2 |
WONT START |
CHECK - R931
( 150K ) ,
R932 ( 120K )
, R919 AND R920
( 100K ) CONNECTED IN
PAIRS TO TDA4601 |
|
Hitachi |
G7P2 |
WON'T START |
CHECK R931 150k
932 120k 919 + 920 100k |
|
Hitachi |
G7PII |
Dead |
C919 4n7 1kv had split -
replacement was 2n2 |
|
Hitachi |
G7PII |
Dead |
R931 150k o/c; IC901
internal s/c; 2 diodes on print side s/c (between chassis & Q901 base)
- 1N4148 & 6v2 zener; BUT11AF o/c base |
|
Hitachi |
G7PII |
dead |
ZD903 130v zener s/c;
replace R909 39k, R912 47k, R902/3 82k, C906 4µ7, Q905 BF423 |
|
Hitachi |
G7PII |
dead |
82k start up resistors o/c
& hi res |
|
Hitachi |
G7PII |
dead - gives a rush of
noise thr' spkr initially |
C914 10µ 50v, C910 33µ
10v, C929 1µ 50v, C915 100µ 10v, C917 4µ7 50v all 105 deg |
|
Hitachi |
G7PII |
field collapse |
R719 2R2 safety res o/c -
no other fault found |
|
Hitachi |
G7PII |
int field collapse |
9v supply to field chip
drops to zero, IC703 MC7809 faulty or dy jointed |
|
Hitachi |
G7PII |
Int off |
R919/920 100k also check
R932 150k |
|
Hitachi |
G7PII |
int start up |
start up volts pin 9 IC901
only 2v - check/replace resistor chain R939,940,941,942,902,903 & C914
2µ2 |
|
Hitachi |
G7PII |
No start up |
Pin 9 IC901 low at 5v (9v)
- C914 10µ 50v faulty |
|
Hitachi |
G7PII |
No start up - comes on
briefly then trips |
R909 39k hi res |
|
Hitachi |
G7PII |
slow start up |
R909/2/3 all ok but C906 4µ7
250v hi esr & C905 100µ 160v |
|
Hitachi |
G7PII |
St/by only |
C906 4µ7 250v, ZD903 130v
zener s/c & R909 39k as a precaution |
|
Hitachi |
G7PII |
St/by only - trips at sw on |
HT
= 130v (110v) R909 39k risen in value and adj HT pot |
|
Hitachi |
G7PII |
St/by only - trips at sw on |
IC703 reg dry joints |
|
Hitachi |
G7PS |
low ht 40v & Q903
chopper overheating |
D905 s/c |
|
Hitachi |
G7PS |
PSU blow up |
Reason could be - T901 dry
joints on pcb & wrapped end |
|
Hitachi |
G7PS |
R763 burns up at sw on |
R760, 761, 762 & 766
all o/c & R763 3k3 replaced |
|
Hitachi |
G7PS |
Striations on lh side - ok
from scart |
L101 choke in 12v supply
faulty |
|
Hitachi |
G7PS2 |
BRIGHT WHITE THEN FIELD
COLLAPSE |
CHECK Q801 SC |
|
Hitachi |
G7PS2 |
DEAD , 130v ZENER s.c. |
REPLACE R909 39K EVEN IF
READS OK. |
|
Hitachi |
G7PS2 |
Dead. |
112v rail high R716
( 51k ) o/c. |
|
Hitachi |
G7PS2 |
Fails to start |
R902 & R903
( 82K ) |
|
Hitachi |
G7PS2 |
HIGH EHT WITH SET TRIPPING
TO SBY INSTANTLY |
R909 39K HIGH also replace ZD903 |
|
Hitachi |
G7PS2 |
INT DEAD |
ZD901 6v8 zener |
|
Hitachi |
G7PS2 |
INT DEAD |
39K - 82K POWER SUPP - ALSO
D/J on reg 12V (EDGE OF PCB
BY LOPT. ) |
|
Hitachi |
G7PS2 |
INT. FLAG WAVING AFTER TELETEXT USE |
IC2002 ( TEXT PCB ) |
|
Hitachi |
G7PS2 |
No OSD set works ok |
Replace HD401314RS |
|
Hitachi |
G7PS2 |
No signals Tuning bar moves
as if tuning but no va |
Check R044
( 12K ) |
|
Hitachi |
G7PS2 |
OSD NOT CLEARING |
DOO7 HIGH |
|
Hitachi |
G7PS2 |
Shuts down aft 20 secs with
buzz |
In prot mode (shutdown
volts at pin 20 TA8690AN) ZD701 3v9 zener leaky |
|
Hitachi |
G7PS2 |
STANDBY ONLY |
IC703 DRY JOINTS |
|
Hitachi |
G7PS2 |
When tried to tune in the
correct display appeared |
The 33V tuning voltage
supply was missing because R044 (
12k ) was open-circuit. |
| Hitachi |
G7PSL |
Excess bright raster |
RGB colls low volts - Q801
BC558B leaky (on main pcb) |
| Hitachi |
G7PSL |
Field chip has short life |
Add 2 x 33v zeners in
series - cathodes to pin 2 IC601 & anode to chassis - if this has no
effect , could be crt flashover |
|
Hitachi |
G7PSL |
Field jitter when hot |
D601 1N4002 |
| Hitachi |
G7PSL |
Field non
lin |
C712 2200µ 50v & C606
680µ 16v |
| Hitachi |
G7PSL |
No signals - osd searches |
Tuning volts missing VT pin tuner, R044 12k o/c |
|
Hitachi |
G7PSL |
NO TUNING - JUST SNOW
( TUNING BAR PRESENT
ON SCRE |
R044 12k OC. ZD002
( 33V Zen ) Q003 |
| Hitachi |
G7PSL |
St/by only |
Q781 2SD1884 LOPTr, Q903
BUT12AF chopper tr & ZD903 P6KE180A overvolts zener s/c - R760, R761,
R762 & R766 2R2 ½w hi res |
|
Hitachi |
G7PSL2 |
St/by only |
ZD903 130v zener s/c; C906
4µ7 250v hi esr; R901 6R8 5w o/c;Q903 BUT12AF s/c; F901 2.5A o/c - all
caused by dry joints T901 |
|
Hitachi |
G7PSMK2 |
Dead - HT at 145v. |
R909 high. |
|
Hitachi |
G7PSMK2 |
Dead - HT low 45v. |
Change C910 , C914 , C916 ,
C929 |
|
Hitachi |
G7PSMK2 |
Int frame collapse. |
Drys on frame IC &
LOPT. |
|
Hitachi |
G7PSMK2 |
Standby only. |
R902 ( 82k ) o/c. |
|
Hitachi |
G8Q |
blank raster - no chan
display |
odd dashes pesent when
buttons pressed. No 5v supply- D934 in chopper psu s/c & R933 2R0 u/s |
|
Hitachi |
G8Q |
Blank raster & no sound
- stuck in AV mode |
IC1501 micro faulty - pin
37 was being held low perm (should be low only when in AV mode) |
|
Hitachi |
G8Q |
Blank raster, can't tune
chans & front controls operate different functions |
Reprog memory chip IC502 |
|
Hitachi |
G8Q |
Blank raster/no
sound/tuning/front display distorted |
Micro reqs reprog - see
separate article |
|
Hitachi |
G8Q |
BLANK SCREEN + NO SOUND
ONLY CERTAIN CHANNELS |
SELECT BLANK CHANNELS PRESS
TUNE/AFC VOL -
STORE THEN DO THE SAME ON OTHER CHANNELS THEN PRESS TUNE/AFC |
|
Hitachi |
G8Q |
Bright white pic with no
sound |
IC952 12v reg o/p down to
9.5v - reg u/s |
|
Hitachi |
G8Q |
Bright white raster |
C720 4µ7 in RGB supply o/c |
|
Hitachi |
G8Q |
Bright white screen |
Dry joint C711 due to
pressing on back cover |
|
Hitachi |
G8Q |
Buzz on sound |
IC201 TA8691N chip reqs
replacement |
|
Hitachi |
G8Q |
Buzz on sound even with vol
right down |
TA8691N - ord code 19869A
WVE |
|
Hitachi |
G8Q |
Channel tuning problems |
IC1502 MDA2062 memory chip |
|
Hitachi |
G8Q |
Dark pic |
A1 control (part of LOPTx)
faulty, R881 470k high or C881 10nf leaky |
|
Hitachi |
G8Q |
dead |
ZD901 27v zener s/c |
|
Hitachi |
G8Q |
Dead |
No activity around SAA1293H control chip - X1501 4Mhz Xtal
faulty |
|
Hitachi |
G8Q |
Dead |
RU2M 20v supply rect s/c & LA4270 audio o/p chip blown |
|
Hitachi |
G8Q |
dead - comes on eventually
if on/off sw held in |
volts across C908 gradually
increases - TH902 thermistor hi res (approx 2M) remove & clean or
replace (better) |
|
Hitachi |
G8Q |
Dead - fuse FS901 o/c. |
Drys T901 , check Q902 ,
ZD901 , OC941 , ZD941 , Q941/2 , D905 |
|
Hitachi |
G8Q |
Dead - fuse o/c. |
Change all
transistors/diodes in PSU. |
|
Hitachi |
G8Q |
Dead - fuse shattered |
Degaussing therm, Q902 s/c,
ZD901 27v zener s/c, D903 leaky, IC901 UC3844 chopper chip sus & ZD902 |
|
Hitachi |
G8Q |
Dead - HT present - no line
drive |
St/by line from micro 3.5v
(should be 8-12v on , 0v in st/by) D1504 1N4148 in st/by cct faulty |
|
Hitachi |
G8Q |
Dead - intermittently. |
Drys on T901 , D933 or
LOPTX. |
|
Hitachi |
G8Q |
Dead - no line drive |
Timebase chip TDA2579 faulty - no line drive o/p at pin 11 |
|
Hitachi |
G8Q |
Dead - no PSU operation |
D907 BYV10-40 s/c also
check UC3844 & Q901/2 |
|
Hitachi |
G8Q |
Dead - went off with abang |
TH902, also check Q901,
Q902, ZD901, ZD903, D905, D907, D908 IC901, C908 , R910 & check print |
|
Hitachi |
G8Q |
Dead after smoking |
C715 in E-W cct dry joints |
|
Hitachi |
G8Q |
Dead apart from chan no. |
12v supply only 5v - C933
2200µ 25v |
|
Hitachi |
G8Q |
Dead apart from tripping |
Txt panel dis'd & trip
stops - C933 |
|
Hitachi |
G8Q |
Dead- fuse blackened |
Check TH902 thermistor |
|
Hitachi |
G8Q |
Dead or int start up/off |
Start up therm TH902 o/c |
|
Hitachi |
G8Q |
Dead with blackened mains
fuse |
Melted PVC tape from
degaussing coils touching audio amps heatsink |
|
Hitachi |
G8Q |
DEAD WITH LINE DRIVER
TURNED FULLY ON AND LED NOT |
CHECK AROUND IC1502
( SAA1293 ) FOR ACTIVITY if none replace X1501 crystal |
|
Hitachi |
G8Q |
Diagonal bands of interference - esp in Txt |
C932 470µ 16v |
|
Hitachi |
G8Q |
Display corrupt |
Check Q1502/3/4/5 - Q1505 was leaky BC548 |
|
Hitachi |
G8Q |
EEPROM keeps becoming
corrupted |
Deguassing positor int
arcing |
|
Hitachi |
G8Q |
excess brill / fb lines |
200v video supply missing -
R720 2R0 o/c |
|
Hitachi |
G8Q |
EXCESSIVE WIDTH - NO E/W
COECTION |
D705 , C714 BYW96D AND
27nf |
|
Hitachi |
G8Q |
Field collapse |
No supply to IC601 FOP chip - R715 1R fusible o/c &
chip u/s |
|
Hitachi |
G8Q |
horizontal lines appear
when set is warm |
Tuner goes thermally
defective |
|
Hitachi |
G8Q |
Horizontal lines when
warmed up |
tuner thermally defective |
|
Hitachi |
G8Q |
HT high at 165v & won't
adjust |
ZD941 ref diode BZV10 leaky |
|
Hitachi |
G8Q |
Int blank
screen/snowy/flickering |
Ripple on 12v line caused
by C932 1000µ corrupting micro |
|
Hitachi |
G8Q |
Int comes on into standby
from cold. |
Thermister TH902. |
|
Hitachi |
G8Q |
Int corruption of stored data - all sigs lost & reverts
to chan 0 |
5v supply to txt pcb int lost - coil on back of board in
supply from 8v reg IC001 line was dry jointed |
|
Hitachi |
G8Q |
Int Crackle on sound |
Replace C1522
( 1nF ) C460
( 100nF ) C454
( 22nF ) C453
( 22nF ) |
|
Hitachi |
G8Q |
INT CUTTING OUT AFTER
REPAIR TO POWER SUPP. |
CHANGE R910 ,
C908 , VR901. SET POT
TO 12 OCLOCK *******DISCHARGE C906 BEFORE ANY WORK******* |
|
Hitachi |
G8Q |
Int fails to start. |
TH902 THERMISTOR |
|
Hitachi |
G8Q |
Int loss of green |
RGB o/p tr BF459 faulty -
can use BF462 in lieu |
|
Hitachi |
G8Q |
Int st/by |
R718 51k hi res replaced -
triggering crowbar thy |
|
Hitachi |
G8Q |
Int to start up |
TH902 |
|
Hitachi |
G8Q |
Int trip |
R910 5R increased res - could be IC1501 micro |
|
Hitachi |
G8Q |
Lack of sync |
Q2110 BC548B on txt pcb |
|
Hitachi |
G8Q |
Line hold lost |
IC431 M51551P on IF panel |
|
Hitachi |
G8Q |
Memory lost |
Check for 3v at IC1502 MDA2062 memory chip & R1519 27k
1w |
|
Hitachi |
G8Q |
Narrow & Pic shift to
right with weak sync |
TDA2579A & check R725
470k |
|
Hitachi |
G8Q |
no eht & 12vsupply only
5v |
C933 2200µ 25v leaky |
|
Hitachi |
G8Q |
No or only part of display shows |
Check IC1501 SAA1293H by subst - if only part of display showing check R15060R1513 100R |
|
Hitachi |
G8Q |
No OSD |
R008 470k o/c or dry
jointed |
|
Hitachi |
G8Q |
No raster - field collapse |
Check pin 9 IC601 if low
(should be 9v) check R715 1R for o/c |
|
Hitachi |
G8Q |
NO SOUND |
D701 ( 1N4148 ) ,
TDA2579. |
|
Hitachi |
G8Q |
No sound |
D701 1N4148 & TDA2579 timebase chip |
|
Hitachi |
G8Q |
NO SOUND
INT GOES TO STBY |
IC1501 MICRO u/s. |
|
Hitachi |
G8Q |
NO SOUND OP STAGE OK |
D401 IN IF CAN OC |
|
Hitachi |
G8Q |
NO SOUND PICTURE GOES WHITE |
IC952 12v REG US |
|
Hitachi |
G8Q |
No sound/pic - blank raster
when A1 increased |
Dry joint connection to
sleeved wire that links 8v supply to IC001 5v reg |
|
Hitachi |
G8Q |
No sound/pic - psu working ok |
No 12v supply as reg was u/s |
|
Hitachi |
G8Q |
No start up - st/by only |
R903 82k o/c |
|
Hitachi |
G8Q |
No startup - sounds like
faulty BU. |
C85 s/c. |
|
Hitachi |
G8Q |
No sync |
Q2110 BC548B on txt panel |
|
Hitachi |
G8Q |
No text |
Check programming |
