TV
Repair Database
|
Morphy Richards |
CT870 |
Dead |
D304 efficiency diode u/s - used RGP10 |
|
Murphy |
M20T01 ZX4200 |
No go - just1 Psst at switch on. |
C93 ( 1u f , 100v ) o/c by TDA4503 IC. |
|
Murphy |
M22S01 |
DEAD FAINT TICKING SOUND |
D21 SC LOPTX MAY BE SC ALSO |
|
Murphy |
M22S01 |
Field stretched at top, ragged verts & hum bar |
C87 47µ 200v |
|
Murphy |
M22S01 ZX4200 |
Dead - with faint ticking. |
D21 ( BY229P ) s/c , may be due to LOPTX being faulty. |
|
Murphy |
V1400 |
Frame collapse. |
C408 ( 1u f ) o/c. |
|
Naiko |
N1096 |
dead |
dry joint C308 3n3 connected to TA7698AP chip |
|
Naiko |
N1096 |
dead |
melted dc socket |
|
Naiko |
N1495 |
Dead - positor faulty had blown fuse |
Konig 4740 as used in ICC5 works ok |
|
NEC |
FS2910MH |
Tripping |
STRS6709 & caps in psu + unmarked zener (used 7v5) |
|
NEC |
FS4620 |
RIPPLE ON VERTICALS WITH BRIGHT SCENES |
C609 100uF 160v |
|
NEI |
1288 |
No pic/sound aft 5 mins |
D701 LOPTr feed int o/c |
|
NEI |
1451 |
Dead |
Dry joints R806 (in supply to base of chopper tr) |
|
NEI |
1451 |
Dead - BU508 chopper tr Q800 s/c |
R809 270k o/c |
|
NEI |
1451 |
Int operation |
R802 blue positor pt no 28002001 ( rattles when shaken if duff) - should
read approx 5k when cold |
|
NEI |
1601 |
Periodically blows chopper tr |
Check RP36 33R safety res in snubber network to 26v supply - may be o/c |
|
NEI |
2031 |
No pic - sound ok |
HT ok at 120v - no lop or drive - R605 5k6 4w o/c |
|
NEI |
2131 |
Field collapse/ int height & going off tune |
D001 TAA550 33v volt stab faulty - (feeds IC100 TDA8305 jungle chip) |
|
NEI |
2131 |
No pic - sound ok |
Pin 8 TDA3651A sandcastle pulse low - TDA3653 pin 7 FOP chip was cause - FOP
chip faulty |
|
NEI |
2151 |
Bright raster with fb lines with noisy LOPTx |
R731 on crt base o/c & check col decoder chip |
|
NEI |
3743 |
Dead - blew BUZ77 & 0R47 feed res |
330k resistor in pri psu hi res |
|
NEI |
11AK08 |
Black lines across pic |
R461/463 560R connected to pins 42/43 IC401 - may measure ok |
|
NEI |
11AK08 |
Brightness low or varies |
C907 1nF or 10nF 1kv leaky in A1 supply or R925 470k o/c |
|
NEI |
11AK08 |
Dead - no o/p from psu |
R809 o/c, TR 802 shorted windings, Q801 chopper tr s/c, replace D808 BYT52M,
R805 o/c & check mains filter choke TR801 for damage, R802 o/c, IC801 s/c
pin 6 or D806 s/c |
|
NEI |
11AK08 |
Field - bottom cramp |
C701/2 4n7 leaky, C705 3µ3 50v o/c |
|
NEI |
11AK08 |
Field - top cramped |
IC401 |
|
NEI |
11AK08 |
Field - top foldover |
D701 or C703 470pF leaky, R717 1k or 560R o/c, C704 0µ1 leaky |
|
NEI |
11AK08 |
Field collapse |
Check for cracks around IC701 & chip itself, if 26v absent at pin 9 R711 4R7
fusible o/c; C701/2 4n7 leaky, R707 3k9, R702 10k, R706 1R8, C426 10nF, C453
33nF |
|
NEI |
11AK08 |
Field cramped with bright line across centre |
Scan coils - should read 13.5R |
|
NEI |
11AK08 |
Field jitter |
R441 10M in ramp gen cct o/c or int |
|
NEI |
11AK08 |
HT low at 85v |
R813 hi res |
|
NEI |
11AK08 |
Line pairing & top stretched |
R709 470R high res or o/c |
|
NEI |
11AK08 |
Lines across pic |
C704 0µ1 o/c |
|
NEI |
11AK08 |
Low gain, noisy pic |
C428 1µ 50v o/c pin 48 IC401 |
|
NEI |
11AK08 |
No colour - may be int |
Check IC401 (low sat volts pin 26), X401 4.43Mhz Xtal, C420 18pF, R437 100k,
C418 0µ1 & C419 4n7 |
|
NEI |
11AK08 |
No video - OSD OK - stuck in AV mode |
Q404 BC548B leaky & check for shorts pin 12 IC501 & chassis |
|
NEI |
11AK08 |
Pic blanks aft several hours |
C707 100µ 63v leaky or fitted incorrectly |
|
NEI |
11AK08 |
Pic shifted upwards |
C706 1000 35v scan coupling cap leaky |
|
NEI |
11AK08 |
Slow tripping |
VR801 o/c & check D809, R804/805 & IC801 |
|
NEI |
11AK08 |
Sound - arcing noise from speaker |
IC401 |
|
NEI |
11AK08 |
Sound int |
C364 100nF shorting to link between pins 2 & 8 IC305 |
|
NEI |
11AK08 |
St/by only |
If IC501 pin 41 changes check Q802/803/804/805, D840/841 1N4148 leaky, IC802
s/c |
|
NEI |
11AK08 |
Sync poor or absent |
C408 47nF leaky pin 15 jungle chip IC401 |
|
NEI |
11AK08//10 |
Servicing 11AK08 & 11AK10 |
See TV mag Feb 2000 |
|
NEI |
1451 |
Blank raster with flyback lines - sound Ok. |
R371 ( 100R fusible ) o/c ( on CRT base ) |
|
NEI |
1451 |
Dead - 1.6A fuse blown. |
D800 , D802 ( 1N4007 ) s/c , Q800 ( BU508A ) s/c. |
|
NEI |
1451 |
Dead - fuse blown. |
BU508 s/c , R801 ( 2.7R ) o/c , R809 ( 270k ) o/c , Bridge rec. |
|
NEI |
1451 |
Dead. |
T801 windings s/c. |
|
NEI |
1451 |
Dead. |
Line driver TX u/s , Q601 ( BC639 ) s/c. |
|
NEI |
1451 |
Frame collapse - blank raster. |
Drys on T801. |
|
NEI |
1451 |
Int tripping. |
R605 ( 4.7k 1W ) high. |
|
NEI |
1451 |
Not tuning in. |
Drys on pin 1 K001. |
|
NEI |
1451 |
Tripping. |
T801 windings s/c. |
|
NEI |
1451 |
Uncontrolable sound. |
The single green plug gos to l/h of 2 small sockets not CRT base. |
|
NEI |
1451TX |
Dead - int to start with |
LOPTr s/c; HT dropper 2R7 o/c; 2 x mains rects; dry joints R812 47R |
|
NEI |
1451TX |
Dead - no line drive |
R605 5k6 in HT feed to driver tr o/c |
|
NEI |
1451TX |
Won't tune - other buttons do strange things |
Reprog EEPROM |
|
NEI |
1481TX |
Dead |
L802 dry joints, R802 270k o/c |
|
NEI |
1481TX |
Dead - ok on dummy load |
Dry joints around D805 |
|
NEI |
14FRE |
Blank raster when A1 advanced |
Pin 8 TDA3650 sancastle pulse missing - ok at pin 17 TDA2579 timebase chip;
link on top of Txt pcb dry joint |
|
NEI |
14NE3743 |
wont store chans |
eeprom 24C02 - 24C04 can be used in lieu |
|
NEI |
1551TX |
Horiz lines across pic |
Dry joints -ve end of C513 on vert mounted Txt pcb |
|
NEI |
2031 etc. |
BUZZ ON SOUND |
CHECK 22nf CERAMIC CAPS AT ONE END OF IC. |
|
NEI |
2031TX |
Int st/by - unable to switch back on |
dry joints psu (all joints resoldered!) |
|
NEI |
2031TX |
Wont come on from st/by - ok by on/off sw |
SAA1293A R/C decoder chip |
|
NEI |
2031TX |
WONT START FROM SBY , ONLY IF PRECISE SWITCH ON FRO |
DSAA1293 |
|
NEI |
2031TXT |
Int dead |
Dry joints chopper tfmr |
|
NEI |
2041TX |
Pulling at top when playing videos |
Change R560 from 220R to 100R - not marked, at back between link K100 &
green delay line |
|
NEI |
2051TX |
Dead |
No volts at chopper Tr coll - dry joints feed coil |
|
NEI |
2131 |
BLANK RASTER WITH SOUND |
TDA3653 FIELD OP. IC. |
|
NEI |
2131 |
FIELD COLLAPSE NO FIELD DRIVE |
D001 TAA550 33v STABILISER US ( FEEDS REFERENCE INTO TDA8305 ) |
|
NEI |
2131 |
Field lineararity |
C407 ( 1 , 500uF ) 50V |
|
NEI |
2131 |
No sound |
Check for D/J on Speaker plug |
|
NEI |
2131 |
Sound No pic |
R605 ( 5K6 ) 2Watt |
|
NEI |
2131TX |
Dead - off with a bang |
LOPTr Q600 s/c because C604 1µ 160v was dry jointed, also D604 BA157 s/c,
R609 10k burnt up |
|
NEI |
2151 ( Indiana 10 Indiana |
Bright raster and flyback lines. |
R73 1 on the CRT base panel was open-circuit , removing the supply to the
RGB output stages with this fault you sometimes have |
|
NEI |
2151TX |
Dead - 1.6a fuse blown. |
D802/805 ( 1N4007 ) s/c. |
|
NEI |
2151TX |
Distorted sound. |
TDA8503 |
|
NEI |
2151TX |
Tripping. |
D804 ( BY398 ) s/c. |
|
NEI |
2591FTXN |
excess width with bowed verts |
R371 1R o/c due to tv operated with line scan coils dis'd |
|
NEI |
2591FTXN |
No EW correction |
no pulses pin 8 TDA8145 EW chip. Check 2 x 150k feed resistors |
|
NEI |
2591FTXN |
no line osc - comes out of st/by but no green led |
check earthing of lop tr heatsink (wire link by C130) |
|
NEI |
2591FTXN |
no r/c |
check TFMT4380N ir rec data o/p |
