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 |
|
Hitachi |
G8Q |
No text - VERY weak text in
mix + poor osd |
TDA3562A us |
|
Hitachi |
G8Q |
No tuning |
R1534 39k hi res |
|
Hitachi |
G8Q |
off |
No volts pin 7 IC901 TH902
o/c & ZD901 s/c |
|
Hitachi |
G8Q |
off - ht present |
no line drive - IC701 pin
10 only 4v (12v) C933 2200µ also C932 470µ 16v & C934 220µ 16v |
|
Hitachi |
G8Q |
Outline & shimmers |
IC201 in IF panel |
|
Hitachi |
G8Q |
Pic goes red & green
aft 20 mins |
TDA3562 col dec chip |
|
Hitachi |
G8Q |
Pic obliterated by lines
until heated |
C720 4µ7 250v |
|
Hitachi |
G8Q |
Picture blanks out when
using VCR pic Search |
Remove Q1507 & fit 2 x
IN4148 1st between R1520 & Emitter
Q1507 2nd between R1521 & emitter Q1507 Cathodes to emitter |
|
Hitachi |
G8Q |
POOR CONTRAST |
CHANGE R10 FROM 1Kohm TO
10Kohm |
|
Hitachi |
G8Q |
Power supply shutting down. |
Q941. |
|
Hitachi |
G8Q |
psu blown |
replace D906 1N4148, D907
BYV10, IC901 UC3844, Q901 SGSP222, Q902 SGSIF344, R910 0R5 7W, TH902,
ZD902 ZTE2S1, ZD901 BZX79C & check mains bridge rect
and small electrolytics |
|
Hitachi |
G8Q |
Repeated failure of FOP
chip TDA3654 |
dry joint scan coil tag
& replace cap pin 6 of chip - 47 or 100µ |
|
Hitachi |
G8Q |
Severe tuning drift |
R1501 high / oc 100k or may
be 22k |
|
Hitachi |
G8Q |
Slow start up with tearing |
C933
2200µ 25v in 12v supply o/c |
|
Hitachi |
G8Q |
St/by only |
It
is normal for front controls not to bring set out of st/by - check hset is
working! |
|
Hitachi |
G8Q |
Startup - slow start up. |
TH902 should read 4k when
cold. |
|
Hitachi |
G8Q |
Stuck in AV mode |
IC501 micro |
|
Hitachi |
G8Q |
Stuck in AV mode. |
R1569 ( 10k ) ,
IC501 |
|
Hitachi |
G8Q |
Tripping |
Try loading 145v HT line from bulb, could be TDA2579A IC701
tb chip. If still no go, lift R713 connected to pin 16 (trip) of IC701. If
now ok then Xtal X1501 or EEPROM IC1502 could be cause |
|
Hitachi |
G8Q |
Tripping |
C908 220µ fallen slightly
in value |
|
Hitachi |
G8Q |
Trips |
Pin 2 IC901 incorrect at zero (2.3v). Crack at pin 3
Chopper tfmr |
|
Hitachi |
G8Q |
Trips at sw on |
C906 220µ 385v mains
smoother |
|
Hitachi |
G8Q |
Tuner drift |
R001 47k, C001 100nf next
to tuner |
|
Hitachi |
G8Q |
Tuning - drift. |
IC1503 ( ZTK33B ) |
|
Hitachi |
G8Q |
Tuning - looks off tune -
shimmering outline. |
IC201 on IF PCB. |
|
Hitachi |
G8Q |
Txt - very weak & shows
only in mix mode |
TDA3562 col dec chip |
|
Hitachi |
G8Q |
Txt displays P100 and no
other txt activity |
Clean & check for dry
joints Txt panel |
|
Hitachi |
G8Q |
VERY FAINT AUDIO IN STANDBY |
THIS IS NORMAL-SAY Hitachi |
|
Hitachi |
G8Q |
Weak sync - esp on chan
change |
R932 0R2 safety res in 12v
feed hi res |
|
Hitachi |
G8Q |
Width excessive & no E-W corr |
D705 BYW96D goes s/c & causes IC651 TEA2031A demise -
also check C714 27nf |
|
Hitachi |
G8Q/P |
No pic or sound, blank
raster with corrupted OSD |
C932 1000µ 16v in 8v
supply o/c |
|
Hitachi |
G8QP |
Complete failure |
Check for cracks in print
around Chopper TX |
|
Hitachi |
G8QP |
DEAD , ONLY HT (
110v )
BOTH 8v AND 12v LINES LOW |
CHECK C933 2200mfd ON 12v |
|
Hitachi |
G8QP |
HIGH BRILL AT SWITCH ON MAY
RECOVER WHEN WARM |
C 720 4.7mfd 250v |
|
Hitachi |
G8QP |
LINE ACROSS SCREEN |
R715 ( 1R0
) HIGH |
|
Hitachi |
G8QP |
SOUND NO PICTURE
, NO LINE DRIVE AT PIN
11 TDA 257 |
TDA2579 US |
