TV
Repair Database
|
B
& O |
3707 |
Int
trip at sw on |
C26 22µ o/c |
|
B
& O |
3726 |
When cold it comes on with
the bottom up by 1 inch, slight flyback lines and unlocked
text. The fault clears after 5 minutes, but no amount of freezing will
bring it back, you have to switch off for 10 minutes.
|
C45 (100µF/40V) which
didn't look good
on the ESR meter!
|
|
B
& O |
3866 |
St/by
only |
s/c loptr Tr11 S2000A3, dry
joints C34 6n8 etc |
|
B
& O |
4402 |
dead |
HT only 17v; 5C10 47µ o/c |
|
B
& O |
5500 |
Snowy pic, no sound &
erratic col |
IC6 TDA8120 in IF |
|
B
& O |
7433 |
Txt int & int sync txt |
Tr3 & 4 vid amps and
adj |
|
B
& O |
7700 |
No colour - ok on Txt |
No 11.8v - 3C1 22µ 25v s/c |
|
B
& O |
7730 |
Int colour |
Resolder joints to edge
conn on IF panel |
|
B
& O |
8902 |
Sound muted a few mins at
sw on |
dry joint IC5 pin 5 |
|
B
& O |
3119 |
Dead , safety
resistor RPl4 open-circuit and the |
Replace the line output
transformer , the TDA4950 EW
correction chip IG01 and coil LG02 . |
|
B
& O |
3386A |
St/by only |
dry joints connectors P22,
23, 25 on board 46 (PSU control) |
|
B
& O |
33XX |
Grey scale variations. |
4R18 ( 1.8M ) on
CRT base. |
|
B
& O |
33XX |
INT LOSS SIGNALS |
DRYS ON TCA270S IN CAN E |
|
B
& O |
33XX |
No luminance. |
Drys on tuner/IF contact
strip , drys on coils delay line. |
|
B
& O |
33XX |
No sound mute via hand set. |
1D4 on tuner/IF panel. |
|
B
& O |
33XX |
Pulsating. |
Loose screws on chopper
6TR1. |
|
B
& O |
33XX |
Remote - insensitive remote
hand set. |
Check LEDs for o/c. |
|
B
& O |
33XX |
Startup - no startup. |
Q3 on PSU o/c. |
|
B
& O |
33XX |
Stuck in standby. |
Short on 5T11 transformer
primary-to-secondary. |
|
B
& O |
3400 |
Frame - int frame , sound
& vision. |
OTR8 or 2TR28 |
|
B
& O |
3400 |
Int Field Scan And Also
Sound On Vison |
2TR8 And/Or 0tr28 |
|
B
& O |
3400 |
Intermittent Lin Drive
Sound On Vison |
2TR8 And/Or 0tr28 |
|
B
& O |
3400 |
Intermittent Line Drive |
Check 2TR2 , 2D20 , 2D3 |
|
B
& O |
3600 |
Blue Picture |
16R1 ( 1.5Mohm ) |
|
B
& O |
3600 |
No E-W Correction |
6D5 ( BY299 ) |
|
B
& O |
3600 |
No Picture - Failureof Line
o/p Transitor |
0C1 ( 9.1nf ) |
|
B
& O |
37XX |
Flashing black lines - int |
1TR11 tuner /IF pcb leaky
int |
|
B
& O |
37XX |
Lack of height |
10v supply to fop cct low
at 9v - D32 6v2 zener leaky |
|
B
& O |
37XX |
No line sync |
TDA1940 26IC5 - no sync out
at pin 9 |
|
B
& O |
37XX |
No start up |
Check for dry joints &
Q3 in psu |
|
B
& O |
37XX |
No Txt or osd etc |
8IC1 shift reg chip 4015 |
|
B
& O |
37XX |
Width reduced |
C32 1n5 1.5kv o/c |
|
B
& O |
37XX |
Frame - reduced height |
D32 6.2v zener leaky. |
|
B
& O |
38XX |
Speaker - LH spitting noise |
Poor conns earthing braid/aquadag
on crt |
|
B
& O |
39XX |
SPITTING FROM L/H speaker |
CRT EARTH POOR - CLEAN |
|
B
& O |
4000 |
Frame - int. |
5TR12 ,
5C34 |
|
B
& O |
4000 |
HT Fluctuates |
Check 6R29 , 6R30 ( 56k )
For High Resistance Also 6C20 , 6R27 |
|
B
& O |
4000 |
HT Fluctuates |
6D19 ( 39v Zener )
Leaky. |
|
B
& O |
4000 |
Intermitant Field Scan |
Check 5TR12 Base-Emitter
& 5C34 ( 2000u f ) For
o/c |
|
B
& O |
4402 35XX |
Dead |
Check C10 & C12
( 47u f ) |
|
B
& O |
4402 35XX |
No sound or picture. |
5C10 ( 47u f ) o/c. |
|
B
& O |
4402 35XX |
Width - line collapse. |
Poor connections on scan
coils leads. |
|
B
& O |
4402 35XX |
Width - varieing
intermittentley. |
Poor connections on scan
coils leads. |
|
B
& O |
5102 77XX |
Intermittent negative
picture. |
Dry joints on i.f. board
connector , in vision detect can. |
|
B
& O |
5102 77XX |
Negative picture -
intermittently. |
Drys on IF edge connector ,
& earthg lugs in vision can. |
|
B
& O |
7702 7XXXX |
Dead with no standby LED -
intermittent. |
Drys on or T2 standby
transformer. |
|
B
& O |
8102 71XX |
Won't come out of st/by -
int |
R20 ON REMOTE /
MICROPROCESSOR PCB HIGH IF 2M7 REPLACE WITH 820k |
|
B
& O |
8902 |
Faint raster with Snow THe
Dim Picture |
C22 ( 220uf ) (
18.5v Rail Reads Low ) |
|
B
& O |
9000 33XX |
Tripping - & going to
standby. |
Dry joint on C18
S-correction capacitor. |
|
B
& O |
Hybrid |
Teletext - interference. |
4 Page lay out. |
|
B
& O |
L2500 |
Servicing the L2500 |
Picture on cover &
layout. |
|
B
& O |
L2500 L |
Stuck in standby. |
BU508 s/c. |
|
B
& O |
L2502 |
No sound |
IC101 pin 7 (5.9v) = 0v
C111 100µ 25v s/c |
| B & O |
L2502 (3866) |
Dead & squealing |
Resolder a mass of dry joints on the PSU & line output
panel then replace the short circuit line output transistor (TR11)
S2000A3. |
|
B
& O |
L2502 3866 |
Int starting , chopper
drive present. If pin 3 IC1 , LM358 low check R14 & R16 , 220k. |
If still no go ,
check TR20 on Tuner IF PCB . |
|
B
& O |
L2505 |
st/by only after short
squeal at sw on |
lop tr TR11 S2000A3 s/c and
resolder dry joints esp at C34 6n8 |
|
B
& O |
LS5000 |
Txt fault - blue blocks
darken on lh side |
C56 4µ7 25v & check
for drys around IC2 on txt pcb |
|
B
& O |
LX2500 37XX |
NO STBY LED SET STUCK IN
STBY |
C14 470uF 16v OC |
|
B
& O |
LX2800 37XX |
Sync - poor sync. |
26IC5 ( TDA1940 ) |
|
B
& O |
MX1500 |
INT GOES INTO SEEK |
MOMENTARY SWITCH NEAR MAINS
SWITCH INT SC (
REMOTE CONTACT ) |
|
B
& O |
MX1500 |
Won't tune |
TRANSISTOR 7070 LEAKY BC548 |
|
B
& O |
MX1500 78XX |
raster but no sound or picture. |
ICP1640
( 630mA ) o/c. |
|
B
& O |
MX2000 31XX |
Bright raster with no
sound. |
RL28 1.5ohm dry. |
|
B
& O |
MX2000 31XX |
INT FIELD COLLAPSE |
DRY JOINTS ON EW DIODES OR
ON CL12 |
|
B
& O |
MX2000 31XX |
No picture. |
Drys on CRT base. |
|
B
& O |
MX2000 31XX |
No sound. |
6Mhz coil LD40 o/c. |
|
B
& O |
MX2000 31XX |
Standby - no standby light. |
RP43 0.47ohm o/c , CR67
( 1 , 000uf ) on microcomputer PCB8. |
|
B
& O |
MX3500 |
Crackling Sound |
Dry joints audio o/p chips
IC3 & 4 on PCB10 (bottom board) |
|
B
& O |
MX4500/5000 |
Tuner int |
Discard VHF tuner if not
reqd or blanket resolder (nearest ae skt) |
|
B
& O |
MX7000 |
Dead - tripping |
Dry joint capacitor adj to
J9 in chopper ctl |
|
B
& O |
Teletext 33XX |
Display - no OSG - teletext
on 100. |
Chip 8IC1
( 4015 ) |
|
B&O |
7430/7702 |
int pic |
TR2 BC338 on left of pcb
int o/c b-e |
|
B&O |
L2500 |
psu shutdown |
line dr tr 4TR15 BC328-25
o/c b-c |
|
B&O |
LX2802 |
no raster field collapse |
TDA2170 u/s nla TDA8172 in
lieu c/w adaptor + 4R78 3k3, 4R85 0R56 |
|
B&O |
MX3500 |
crackling sound |
dry joints AF o/p chips IC3
& 4 on PCB10 (bottom) |
