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Seruice
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Chassis
MDl
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Contents
Technical
t.
Connection
2.
3.
4.
5.
6.
7.
instructions for repairs,
SaÍety
Maintenance
Wamings
Mechanical
Block diagram
Testooint
Wiring diagram
Modes,
Service
Protections,
Electrical diagrams
voltage diagram
Supply
supply 21"
Power
Power supply
Horizontal
Vertical
output
Audio ampliÍier
Tuner + lF
processing
Video
speciÍications
facilities and
instructions,
Notes
and
instructions
overview
DST,
Faultfinding
and
"
>
21
output
Chassis
messages,
Error
Repair
and
PWB-layouts
(Schéma
(Schéma
(Schéma
(Schéma A3)
(Schéma
(Schéma
(Schéma
overview
tips
A1)
A1)
A2)
Aa)
81)
82)
Page
2
2
3
4
6
7
8
8
Diagram
12
13
15
16
17
17
19
20
PWB
14
14
14
14
14
18
18
Contents
Electrical diagrams
Synchronisation
lF sound
EuroconnectoÍ
Euroconneetor
Controls
Connections
module
Teletext
panel
CRT
module
Audio
Nicam L module
CTI/Black
N/S
oanel
Mains/RCS/LED
Control
Electrical
8.
Directions
10.
11. List oÍ abbreviations
12.
Spare
audio
Stretch
Inpuvoutput
and
alignments
Íor
parts
lists
1
2
panel
Panel
use
PWB-layouts
and
(Schéma
(Schéma
(Schéma
(Schéma
(Schéma
(Schema
(Schéma
(Schema
(Schéma
(Schéma
(SchémÊ
(Schema
(Schéma
(Schéma
BB)
84)
85)
86)
87)
BB)
89)
C)
01)
D2)
D
G)
l)
J)
l"g"
Diagram
21
21
22
22
23
24
24
25
26 27
27
28
29
30 30
31
32
34
37
39
PWB
18
18
18
18
18
18
18
25
27
29
29
31
Philips Consumer
means,
permission
prior
by
264 GB
82
1996
rights
All
electronic,
of Philips.
9671 TV Service
SM
Copyright
Neitíerl-ands.
reoroduced, storedjn a
ariv
thé
published
PCS
#p
reserved.
retrieval
mechanicá|,
No
systeni
Department
ElectÍonics
part
or transmitted,
photocopying,
B.V. Eindhoven,
of this
Printed in The
Publication
in any
otherwise
or
Netherlands
may be
form or
without
The
by
oCopyright
reserved
Subiect
to modification
PHILIPS
@
4822727
20979
![](/html/ce/ce74/ce74a403390aa0160cb1dfa48239eeffd90ede20bc9b6db0fa3b7c42ea75674b/bg2.png)
Technical
1.
speciÍications
voltage
Mains
Power consumption
nominal
peak
output
standby
Mains frequency
range colour synchronisation
Pull-in
Pull-in range
synchronisation
2. Connection
output
power
Watt)
horizontal
power
Watt)
(Vvatt)
facilities
90");
(t10%)
(!1O"A)
(1
130
10" SF
(1
10' SF 4:3);220
1 80
| 22O-24OV AC
(21'90");
100
:
(21"
: 160
(t10%)
: 3
: 50 Hz
+
>
:
300H2
+
>
:
600H2
and Chassis
r--------------'
t ?ooY t
--T-l--
oo
SK1
/+\
L7-\l
MENU
\:iï-
:Íffi'-''" \:.2-
\
4:3);
(1
10"
10'
SF
$F
(1
150
overview
tÍ
16:9)
16:9)
#
\? ?o
r1----------------a
o OqEo
(DGREEN
m-"-.
ileït--
ilq|-
l[o+]-
"*"
*-"
-*'
l#n
lo
*ï--'
|
lo+-
g-".-
(
*rH*
Rear connectlons
the terminal
Specification
REAR
EXTI - CVBS
RGB
tuner
Audio O R
12-
Audio € R
Audio G L
34-
Audio
Blue I
5-
Audio € L(0.2-2Vnurs>
6-
Blue o
78-
CVBS
EXT1
9-
Green
10-
-
11
Green
1213-
Red
14-
RGB status
Red o
15-
RGB status
16-
EXT1/75o)
17 - CVBS
18 - CVBS J-
19- CVBSo(1Vpp/75O)
cvBS€(1vpp/75o)
20-
-
Earth
21
of
(in/cut)
+
-
(in)
at output
(O.SVnrvrs<
(0.2-2Vnus>
(0.SVnrr,rs<
I
(0,n/pp/75o)
status(o-2V:
-1
6/9; 9.5-1 2V:EXT1
I
O
I
I
screen
INT;
(o,7vpp/75o)
I
(0,7vpp/75o)
(0-0,4V:
INT;1-3V:
sockets
lko)
10ko)
1kO)
loka)
4,5-7Vl
-4l3)
Front + Top
EXT2
-
1
-
2
-
3
-
4
56 - Audio
7-
-
8
9'10
-
-
11
1213- C I
14-
1516-
-
17
-
18
19-
-
20
21 - Earth screen
+
l/O
control
Side
-
(in/out)
CVBS
(in)
SVHS
-
Input:
=
tuneri
outPut
then
Audio
Audio
Audio
Audio
status€
CVBS
EXï2- 1 6/9
o(300mvppl75à')
c
CVBS
CVBS
CVBS0(1vpp/75o)
cvBslío
+
then
EXTz
input:
OR(o.SVnrus<lk())
O R(0.2-2Vnr'irs>10ko)
GL(o.SVnus<1ko)
I
€
;
I
I
output
other
=
inPut
L(0.2-2Vnr'rs>10ko)
(G2V:
:F-Kï 2= a
9. 5- 1 2Y
(1vppi75o)
INT; 4,s7V:
3\
|
Front + Side control
Cinch - audio
O
ctucx
(0.5Vnr',ls
O
ctNcH
(0.5Vnus
FRONT
Audiofuideo
O
crncn cvBSO
O
ctrucn
(2Vnr',rs
O
ctttcH
(2Vaus
Headphone
qn
I
SVHS
@
out
Audio L
< 1kA)
Audio R
< 1kA)
in
Audio
10kO)
>
Audio R
> 1OkO)
8-600ei
1-r
2-I
3
-
4
l/O
+ Side
(red)
I
(whire)
O
(1vpp/75o)
(red)
L
O
(white)
O
(1vppnso)
Yo
co(o,3vpp/75o)
PCS 82 265 GB
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EE-i]
EE3il
E
Topcontml Panetd#
Controld ild/oÍ InpuUOutput
Side
P28| cTu8rek srÍerch Panel
CRT Panel
E
p.zul
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,
3. Safety
Audio Modure
Ni€m LPanet
Tuner / lF
Pirl
Vids PÍocessing
Synórcnislion
lF Sound
Euro ConnecloÍ 1
EuÍo Connsdoí
ContÍols
p.zcl
Connections
4l
Teleteí
Side ConlÍol or
Audio Module
Top ContÍol
instructions
Warnings
SaÍety
instructions Íor repairs
2
presenl
and
Íor repairs, Maintenance
Notes
y#"jt^csrueo
.Z-
<9
PoweÍ supply
HoÍizonlatoutput
VerlicalOutput E P.1il
AudioAmpliÍier
N/S Panet
instructions,
nso-]
I
Eilp.13Jd
P.16-l
E
P.t7l
E
r-l
EE
66532068_001.41
1.
Safety regulations requiÍe that during a
-
the set should
be connected
transformer:
-
saÍety components, indicated by
should be replaced
original ones;
2.
-
Safety
be Íeturned in
should be
-
replacing
when
regulations require
paid
As
a strict
joints
solder
current
o
pins
all
o
fly-backcapacitor(s);
.
S-@rrectioncapacitor(s);
o
line
. pins
o
other components through
the CRT, safety
'rts
original condition.
to the Íollowing
precaution,
through which the
is flowing,
oÍ the line output transformer
output transistor;
of the
connector
current Ílows.
components
by
that after a
points:
we advise
particulaÍ:
in
with
repair:
mains via
to the
the symbol
identical to the
goggles
Íepair the
particular
In
you
to resolder the
horizontal
wires to the
which the
an isolating
a
must be worn.
set must
attention
deÍlection
(LOT);
deÍlection coil;
deÍlection
Note:
This resoldering
metal Íatigue
Íor television sets
-
The
and
-
The
external
-
The
tunction
components
-
The electrical DC
the secondary
which
This
o
e
.
o
-
The cabinet
touching
is
in solder
older than 2
wire
trees and
Íixed with the mounted cable clamps.
insulation oÍ the mains lead
damage.
lead
mains
in
order
or heat sinks.
have a mains isolated
can be done as
check
the mains cord and
unplug
pins
the two
mains
set the
mains cord unplugged
measuÍe
mains
aerial connection on the set.
between
switch off the
two
the
plug
4.5 MO and 12 MO;
pins
oÍ the
should
oÍ any
advised
joints
and is thereÍore only
EHT
cable should be
relieÍ
strain
to avoid
touching the GRT,
resistance
side should be checked
oÍ the mains
switch to the on
resistance
the metal
and
TV
and
mains
checked Íor defects
be
paÍts
inner
bad connections
years.
should
be checked
should
between the
power
supply).
Íollows:
connect
plug;
position (keep
!);
value between
shielding
The reading should be
remove the wire between
plug.
by the customer.
prevent
to
due to
necessary
routed correctly
be checked
for its
hot
plug
mains
(only
for
sets
wire
a
between
the
pins
the
oÍ the tuner oÍ
to avoid
lor
oÍ
the
and
the
the
![](/html/ce/ce74/ce74a403390aa0160cb1dfa48239eeffd90ede20bc9b6db0fa3b7c42ea75674b/bg4.png)
Maintenance instructions
Notes
recommended to have a maintenance inspection
It is
carried out by a
depends on the usage conditions:
r
r
The maintenance inspection contains the Íollowing
.
.
.
qualiÍied
when the set is used under
Íor
example
interval is 3 to 5
when the
grease
dust,
kitchen, the
execute the above mentioned
instruction";
clean the
the chassis;
the
clean
pictuÍe
tube.
seÍvice employee.
in a living room, the recommended
years;
is used in circurnstances with higher
set
or moisture
recommended interval
power
picture
supply
panel
tube
levels,
and
Warnings
1. In order to
high-voltage flashovers must
prevent
Fig. 3.1
Use a
Discharge
ESD IÈs.
2.
prevent
damage
should
high-voltage
until
l
damage to
to the
be used to discharge the
probe
meteÍ reading is
the
lcs
be ave,ided.
picture
tube, the method
and a multimeter
The interval
normal
circumstances,
for
exanrple
year.
1
is
"general
deflection circuitry
and the neck
and transistors, all
0V
In
order 1o
picture
(position
(afier
repair
oÍ
shon'n
tube.
approx. 30s).
in a
actions:
on
the
in
DC-V)
The diÍect voltages and oscillograms should
1.
with regard to the tuner earth
is
called.
The direct voltages and
2.
diagrams
(see
Mode
(L:3
sound
picture
carrier at
WheÍe necessary, the
3.
measured with
Voltages in the
normal operation
indicated
picture
The
4.
gap
is
connected between an electrode oÍ the
and the Aquadag coating.
The
5.
semiconductors
parts
the
position
the type
should be
chapter 8)
kHz, R:1 kHz unless
means
by
tube PWB has
lists
are completely
with the semiconductors
indication
oscillograms
measured in the
with
475.25
MHz.
oscillograms
(''ll-)
power
without aerial signal
and
supply section
(@)
in standby
and
of the appropriate symbols.
indicated in
these semiconductors.
on
(J),
hot
or
earth
shown
Service
a colour bar signal
otherwise)
stated
and direct voltages
are measured
(O).
These values
printed
interchangeable
gaps.
spark
circuit
the
in
unit, inespective
the
diagram and in
be
measured
(I{)
in
the
DeÍault
and
([).
Each
picture
per
as tnis
stereo
and
are
both Íor
are
spark
tube
oÍ
All lCs and
electrostatic discharges
repair
repair
the
Keep components
Together with the
3.
the flat
The deÍlection and the multipole units
the
not recommended.
Be
4.
section and on the
Never replace
5.
is
switched on.
When making
6.
This will
circuit becoming unstable.
nrarry
other semiconductors are sensitive to
can drastically shorten the
you
are
connected by a
potential
same
square
Íactory. Adiustmeni
careful
prevent
as the earth ot
and
deÍlection unit ancj any multipoie
picture
when
taking
picture
mocjules or otheÍ components
settings,
any
(ESD).
Careless handling during
liÍe.
Make sure that during
pulse
band
the
unit.
tools
tubes used
of this unit during repair
measurements in
use
short
at this
also
tube.
plastic
circuiis and tire ciangei
same
forrn
an integrated unit.
aíe set opiimally
ratheÍ than metal tools.
with resistance
potential
unil,
ai
is thereÍore
high-voltage
the
while the unit
oÍ a
to
Figure
3.1
6.
DCtpoLBY
PRO o LOGIC
ManuÍactured
l-icensing
DOLB'/,
trademarks oÍ
sunnounol
license from
under
Corporation.
the
double-D symbol
Dolby Laboratories
Dolbv Laboratories
PRO
and
D!
Licensing Corporation.
LOGIC are
PCS
82
266 GB
![](/html/ce/ce74/ce74a403390aa0160cb1dfa48239eeffd90ede20bc9b6db0fa3b7c42ea75674b/bg5.png)
4.
Mechanical
The
MD1 .2E
executions.
4.1
Styling
(also
Removing
1.
2. The
3. The
with top
applicable Íor
the
First
all screws on the rear
.
4
Screws are located
.
2 Screws
corners oÍ
.
4
Screws are
with the Euroconnectors
rear cover is
between
2
clicks
loosening
driver),
the rear cover
cover
connectoÍs
following
the
click connection
plate.
Process position
chassis has
controland
Íear
cover
located
are
rear
the
Íixed
now held
the
cabinet and the
at the left, 2 at
all clicks
plate
way:
on
and
aerial input
remove
(by
the
at the bottom
instructions
two
different
MD1.1E
at each
at the left
cover.
at the 4
the right
releasing
can
l/O
the
mechanical
side
inpuVoutput
Widescreen)
cover have
and aerial input.
position
in
rear
be removed.
panel
can be removed
screw in
to be
corner of the
and right bottom
corners
oÍ the l/O
by 6 clicks
cover. There
and 2
at the top. After
them with
with
the Euro-
the middle, release
and lift
removed.
cabinet.
are
a screw-
in the
the cover
panel
Service
Small
1 . Push
2. Pull
positions
(SSP)
Panel
Signal
down the
the SSP to the lefi.
up the
horizontal
clicks oÍ the SSP bracket (1)
SSP and
position (180'with
tilt
(LsP)).
3. Put the
bottom
When
all cables on the
also be removed from
better access to component
SSP
plate.
in
the clicks
its bracket
SSP
component side
the SSP counter
Large
Signal
marked
(Figure
"Sewice"
4.2),
(2)
are disconnected,
and copper side.
(Figure
4.1)
and
shift
clockwise
Panel
on the
the
SSP can
providing
to a
process
The
chassis.
1.
Release
2.
Push
cover and
For
some
from
AÍterwards, put
their
back
service
cable
the mains cord
position provides
the
clicks between
pull
the
cabinet
positions
clamps and
the cables
easier
Írom
at the same
cables
channets.
in
back
access
its Íixation
plate
bottom
time backwards.
may have
their original
to the entire
brackets.
rear
and
removed
to be
position.
bracket
PCS
82 267
GB
Click
(1)
Figure 4.1
_014.41
071096
![](/html/ce/ce74/ce74a403390aa0160cb1dfa48239eeffd90ede20bc9b6db0fa3b7c42ea75674b/bg6.png)
LSP
component
1.
Put the
described
2.
Remove screw
SSP
above.
(Figure
side
in
the horizontal
(3)
from
3. Remove the bracket
bracket upwards.
4. Release
5. Lift
the LSP PWB
arrow) and
clicks
pull
(5)
it
a little
and
out
the LOT
releasing
by
(6).
its
of
back.
4.3)
service
bracket.
bracket
position
(4)
click
(indicated
and
as
pulling
by the
the
Clip
(6)
Warning!
LSP
1.
The heat
copper
side
Disconnect the
connector L02 on
2.
lÍ necessary,
3. Lift
component
4. Turn
515/L15
arrow
the
disconnect
LSP
Írom its
side).
the LSP undemeath
UNDER
(7).
The LSP now rests
cable clamp
Warning!
the heat
on
Be careful
picture
The heat
SSP and LSP
(Figure
For
this seruice
(service
1.
Break the
its
2. Disconneqt
copper si]de without
4.5)
position
code number 4822
service
position
the right
at
the cable
connector L02
loudspeaker.
Remove
3.
LSP
4.
Lift the
component
Put
5.
cables
to SSP and cable l28lL28
lrom
LSP
side).
the LSP to the
side at the right hand,
grooves
special
cabinet.
position
Fix
6.
the
between LSP
special holes in the
the
7.
Reconnectcable
8.
Use
reconnect
pin
service
the
cables Írom the
connectors
sinks arc not
x/ith
table/workbencá (Figure
cable to
connected
the degaussing
LSP).
the cable
bracket
as described
the
the
on the
sink
not to
CRT
audio module)
plate,
bottom
and the LOT bracket.
damage the
tube neck.
sinks
are not
connected to
MDl
cable
extension kit
320 11695)
pin (marked
to the
on LSP)
51 0/L10,
hand
side
degaussing
and the
51 1/L1 1
M't
cable on the left
Írom
its
bracket as
vertical
LOT
described
position
above
are made in the
oÍ the LSP
(heat
sink) and
heat
putting
by
bottom
sink and the
in.
128/128.
MD1
cable extension
S1 0/L1 0,
S1
ground.
to
4.4)
(yellow
coil
on the left loudspeaker.
(LSp
above
panel (keep
as indicated
held in
CRT-panel
cable
place
by the
by the
or
ground.
tabte/workbench
is required.
-
see Figure 4.3)
oÍ the bottom
coil
and 51
5/L1 5
Audio module
earlier
(Figure
(8).
bottom
4.5),
For this
plate
the service
ptate
(9).
bottom
ptate.
(yellow
Írom
(LSP
copper
position,
of the
pin
There
plate
from
to
to
kit to
1
1
and 51
/L1
S/Li S.
LSp.
are
put
Click
(4)
Figure 4.3
Figure 4.4
c166532052_01
5.Al
1 10996
Warning! All cables
After
use the service
the right hand
side in the
should
pin
can
bottom
be reconnected
placed
be
in the
plate.
correctly.
spare hole
at
665320s2 017.41
Figure 4.5
![](/html/ce/ce74/ce74a403390aa0160cb1dfa48239eeffd90ede20bc9b6db0fa3b7c42ea75674b/bg7.png)
Mechanical
instructions
Accessing the module with mains switch,
receiver
1. Cut
2.
3. To
4.
Afterwards
(10).
4.2
Styling
control)
Removing
1.
Fot
írom their cable clamps and channels.
cables back
(Fig.4.6)
the tie rap
bottom side
bottom corner
space to handle the mains
Remove
pulling
and
get
be
can
The mains
with
First
all screws on the
.
6 Screws are located at the
.
2 Screws
the rear cover.
.
3 Screws
cover
some service
of the degaussing
(10).
Remove the
Írom
Íixation bracket
its
red mains
the
it backwards
more
movement
pushed
panel
the
degaussing coil should
side control and
ttre rear
aÍe
are located
plate
positions
in
their original
pànel
space, the
pulled
or
can now be
cover
rear
located at the
of the
UO
cables
LED
coil at the left hand
degaussing coil in the left
(1
1)
module.
bracket by
(12).
upwards
removed.
side
cover
just
above,
connections.
may
position.
lifting
left top of the cabinet
(13).
retied at
be
inpuVoutput
have
to
comers oÍ the cabinet.
right
left and
under and left oÍ the
haveto be removed
Aftenttards,
RC5
and
get
to
more
the end
position
(no
be removed.
bottom oÍ
put
the
top
(10)
(1
1)
(12)
Figure 4.6
66532052_01 8.Al
071096
Process
The
chassis
1.
2. When the clicks
Service
SSP copper and component side,
(Figure
'1
. Release the
2. Lift the SSP a little and turn
Service
1.
2.
3.
position
process position provides
during the
The chassis
fixed in the bottom
pushed
pulled
positions
4.7)
LSP.
(16)
180"
provides
This
SSP and also allows
position
Disconnect the cable
connector L02 on the
the
Lifi
backwards
Turn the entire chassis around the CRT
The
chassis rests
LSP backwards.
service
can be
between
back, the chassis and
backwards.
click construction
Írom the LSP.
better access
with table/workbench
from
chassis
(17).
easier
posltions.
pulled
lifted,
plate.
bottom
it to an angle oÍ
to the
for the removal
the
degaussing
to
LSP).
the bottom
the SSP
on
access to the entire
(t
Íorward
plate
the bottom
module servicing
(14)
clmponent
plate
with the
Scm) and
rear cover are
plate
between the SSP and
135'
oÍ modules.
(Fig.
4.8)
(yellow
coil
pull
and
panel (18).
copper side of
can be
(15)
or
side oÍ the
it
the
(14)
Figure
4.7
66532052_01 9.Al
250996
Warnlng!
careful
tube
not
neck.
Be
picture
The heat sinks
to damage
not
are
connected to
the CRT-panel
ground.
or
FiguÍe 4.8
![](/html/ce/ce74/ce74a403390aa0160cb1dfa48239eeffd90ede20bc9b6db0fa3b7c42ea75674b/bg8.png)
position
Service
workbench
1.
Disconnect
connector
2. Lift the chassis
counter
(LSP
(Fig.4.9)
the
cable
L02
on the LSP).
Írom
clockwise
copper
to the
the bottom
(1
9).
3. The SSP can be Íixed with a
plate (20).
The
copper side ofthe LSP can
accessed.
without table/
side)
degaussing
plate
and turn
screwdriver
(yellow
coil
it
to the bottom
now be
Waming!
Be
picture
The
Small Signal Panel
First, remove
Panel. The
bracket
SSP
cables connected
all
SSP can be
(in
the
Large Signal Panel
After removing the
(22),
the LSP can be lifted out the bracket as indicated by
the
arrow.
Accessing
the
panel
notto
careful
tube
damage the
neck.
heat sinks are not
(Fig.4.2)
removed
direction
by sliding
of the arrow).
(Fig.4.10)
(21),
with
and
mains
screw
cannected
to the Small Signal
it
pushing
back the clips
LED
switch,
ÍeceiveÍ
The mains module
picture
the
1. Push the
back and
2. Release the
the
SSP and LSP, lift the SSP a little and turn it to an
angle oÍ
The mains
over
the SSP/LSP.
Remove
3.
is located
tube.
clicks between bottom
pull
the chassis back as
click constÍuction
(16
180'
panel
the 2 screws
in
-
Fig. 4.7)lrom the
see
now
can
be accessed when
left
and right on the mains
middle oÍ the set. below
the
plate
and
Íar
as
-
(14
Fig.4.7)
bracket.
The complete mains
pulling
it
backwards.
panel
can now be removed by
CRT-panel
ground.
to
out of the
RCS
and
rear
cover
possible.
between
LSP.
reaching
panel
or
Figure 4.9
cffi262 02.A1
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Figure 4.10
PCS
82 268
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Testpoint
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271 GB
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Wiring
diagram
Verdrahtungsschema
/
/
@r
Schéma
de
riiiSl
í11^, lÍ.1.E
T--__lï"
càblage
v
I
SMALL SIGNAL
PANEL
SIDE I/O SIDE / TOP
CONTROL
(
CoNNECïORS USED WrrH
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TOP CONTROL
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l
O
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CRT.
cL 66532052_001.41
190996
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6.
Service
Modes,
DST, Error
messages,
Protections,
Faultfinding and
following
In this chapter
6.1
6.2
6.3
6.4 Protections
6.5
6.1 Test
The MD1 chassis
printing.
blocks:
A1-42-43, etc.: Test
*
* C1-C2-C3,
* F1-F2-F3, etc.:
L1-L2-L3, etc.:
*
P1-P2-P3, etc.: Test
*
* T1-T2-T3, etc.: Test
V'l-V2-V3, etc.:
*
6.2 Service
For
easy
RC7150
TV
sets,
also called
number of
Installation Íeatures Íor the dealer
6.2.1
The dealer
presets,
with
the
points
Test
Service Modes and Dealer
codes
Error
finding
Fault
points
is
These test
etc.: Test
modes
installation
is introduced. The
including
all set of
Dealer Service Tool
the DST
can use the RC7150 for
Tv-settings,
Repair tips
paragraphs
"blinking
and
repair
and
equipped
points
with
are reÍerring to the
points
circuitry
points
points
Test
frame output circuitry
Test
ooints
output circuitry
points
point
points
Test
circuitry
and Dealer Service
and diagnosis
RC7150 can be used
the MD1 chassis. The RC7150 is
(RC7150)
is
Dish
are included:
Tool
Service
procedure
LED"
tips
points
test
for the audio
for
control circuitry
the
frame drive and
for the
Íor the line drive and line
power
for the
for the teletelc circuitry
Íor
video
the
the
dealer
DST. The ordering
or
4€,22 218 21232.
programming
settings.
(DST)
in the service
functional
processing
supply
processing
(DST)
Tool
remote
control
for
new
all
Tv-set
the
Exiting the SDM:
-
Switch
cleared).
Note: When
The
SDM
microprocessor controlled
-
For recognition of the SDM
the screen.
oÍ
-
Tuning
Nicam L), PAL on other
-
Volume level
level).
-
Auto switch off
switched off
for 15 minutes).
-
Sleep
-
All other controls
-
When
procedure (See
error buífer,
to the value of
This function
plcture.
or
Alignment Mode
Seruice
6.2.2.2
Entering
-
By transmitting
Dealer Service
normal operation
-
pressing
By
keyboard simultaneously
the
to stand-by
set
the set
immediately
again'
Íollowing
has the
475.25 MHz
at
is
set
picture
Other
timer is disabled.
the microprocessor supports the
SAM:
disabled
when no
operate
6.3) and an error code is
the LED
the last error code.
will
the
Tool
mode or
"MENU"
the
(the
error buffer
the mains
is in SDM,
to
also
"ALIGN'
power
the
set
the mains is switched on
when
pre-deÍined
tuning and linear functions:
"SER"
is displayed at the top
(Secam
on
Multi-France sets
sets).
(oÍ
25olo
the
maximum
sound settings are set to 5096.
and
(normally
video
will
blink
work when there is
(SAM)
(this
and':"
the set
(IDENT)
signal
normally.
the number of times, equai
command with the
works both while the set
in
the SDM).
key
when the set
is also
is
switched off
will enter to SDM
conditions
on
Íor
volume
is
automatically
was received
"blinking
present
no
the local
is in
SDM.
RC7150
while
all
(with
LED"
in the
soud
is in
10
Differenl
via a GFL or
to
the
DST-I
For
directions
program
tables can be
MD2 TV-set
(downloading
DST; see GFL or MD2 service manuals) or by the
(DST/PC
explanation
interf
ace; orderin g code 4822
of the installation
for use of
the
DST
chassis, download code 4 should be used).
Diagnose
6.2.2
The MD'|
DST RC7150.
and the Service
entered by
6.2.2.1 Service
Entering the SDM:
-
-
features
.2
sets can be
These
Default
short circuiting the
Defauft Mode
transmitting the
By
RC7150
By temporarily
Signal
Dealer
Panel.
for the servicer
put
are the Service Alignment
Mode
(SDM)
"DEFAULT'
Service
shorting
programmed
from the
into the DST
GFL
21 8 21 27
Íeatures
recommended
are
of the
DST, the
(For
in the two service modes
Mode
(SDM).
"seÍvice".pins
Tool.
pins
S42 and
can also
SDM
on the SSP.
command
S43 on the Small
with
the
or MD2
n.
the MD1
via the
(SAM)
be
Êxiting SAM:
-
Switch the set
Note: When the
ln the
SAM
screen:
-
Software
microprocessor
version identiÍication
versions in the Software Survey
Product Survey.
-
Error code buffer
-
Options
-
Alignment and
8.2.1, 8.3.1
to stand-bv.
mains
is in
Íhe sef
immediately when the
again.
the following
version
(see
and 8.3.2).
information is displayed on the
(the
software
in the
set
corresponds
(see
paragÍaph
geometry
power
is switched off while
the set will entet SDM
SAM,
is displayed. This software
paragraph
8.4).
information
mains is
version oÍ the
with
the software
published
as
6.3).
paragraph
(see
switched
on
in the
![](/html/ce/ce74/ce74a403390aa0160cb1dfa48239eeffd90ede20bc9b6db0fa3b7c42ea75674b/bg11.png)
Service Modes,
(1)
SoÍtware version
(21
Error
(3)
(4)
buffer
Options
Alignments
and
DST, Error
geometry
messages,
Example:
Errorcodeposition
Errorbuffer
c
afterenteing SDM
(2x) - pause
blink
.
after transmlfÍ,íng
(4x) - pause
blink
o
blink-pause-blink
.
nothing happens
transmrftlng
after
after transmltÍrÍng
-
blink
-
blink
1 2
2 4 1
(2x)
"DIAGNOSE
(4x)
"DIAGNOSE
"DIAGNOSE
3 4 5 6 7
0 0
2 OK
with the
with
3 OK'
4
with
OK'
0 0
DST
the DST
the DST
6.3
Figure
6.1
Error
codes
Ïhe
error code
last
time
the buffer
to right.
-
-
The last
The
error detected
error buffer will
1. exiting
remote
2. transmitting
the DST
-
By leaving
buffer is not reset.
Examples:
ERROR:
ERROR:
ERROR:
The
contents
through the
useful when
1. When
"blinking
there is
the SDM is
oÍ times,
The
LED will
times,
equal
2.
With the DST
made visible.
"DIAGNOSEx
The
LED will
now Íor
the error
Screen
Mode
and
buÍÍer
the
control
the SAM with
oÍ
the
Service
Alignment
(SAM)
"blinking
LED"
contains all errors detected
was
SAM with the
the
The
erased.
(actual)
reset in the Íollowing
be
commands
buffer is written Írom
is the error at the
"standby"
"DIAGNOSE
mains
the
switch,
command
procedure
since the
left side
cases:
on the
9 9 OK with
the error
000000: Noerrorcodedetected
3 0 0 0 0
0:
Error
code 3 is the last
and
only detected error
530000: ErrorcodeSfirstanderror
last
code 5
of the
erÍor bufier
equal to
stay
LED:
no
entered,
the value oÍ
off briefly and blink again the
can also be made visible
procedure.
picture.
There
the
the
to the value to the /ast
a// error
codes
in
While in SDM. transmit the
Ol( wherex is the
error
x ranges Írom 1,
(actual)
detected
This is
especially
two
are
methods:
LED will
blink the number
/asÍ error
code.
error code
the error buffer
command:
position
to
buffer
be made visible
(the
error) to 7
number
can be
in the
last
(the
Íirst
error)
operate in the
code
on
same
position
way
x.
as in
point
1,
but
left
Note!
lmportant!
Enor
code
Note
the set respons
lnterruption
lead to incorrect
Not
chassis support
and the DIAGNOSE
versions
procedure
it
that
all software
NOT
are MlZBAx-x.x
EÍor desoiption
may
take up
to a DIAGNOSE
of
the blinking
results.
versions
the blínking
99 command.
supporting
Bfinking
l€D,
to 7 seconds
contmand.
sequence may
of the MDl.2E
procedure
LED
Software
the
blinking LED
and Ml2COx-3.x.
Pgssble
deÍectve-
before
.
,
coÍnpgnents:
No error
0
BIMOS
(ID48366)
2 MSP3400/3410
erÍor
lzc
3
4 Wrong EEPROM 4x
5 EEPROM
defective
b Tuner errol
oÍ
7 TXT
Histogram Proc.
8
eÍror
9
error
10 WSSB module
error
11 Dolby
erÍor
detected
error
bus error
error 7x
processor
16:9
processor
1x
1c7119
(SSP)
2x
1c7353
(ssP)
3x All lzC-related
components
(SSP)
rc7685
5x 1c7685
6x
8x 1c7210
9x 1c7440
10x
11x
(SSP)
(ssP)
u1000
(ssP)
rc7702
(Íeserved)
(16x9
module)
tc7540
(WSSB
module)
rc7600
(Audio
module)
Table
6.1 Error
code
list
![](/html/ce/ce74/ce74a403390aa0160cb1dfa48239eeffd90ede20bc9b6db0fa3b7c42ea75674b/bg12.png)
Protections,
FaultÍinding
and
Repair
tips
Protections
6.4
In
6.4.1
the MD 1.2E
the
possible:
Protections
o
o
o
.
DeÍlection:
o
o
r
Soítware
o
.
o
Power
6.4.2
The
mode
r
r
o
o
ln hick-up
Pin 1
approximately
protection
hick-up
squeak is
6.4.3 Horizontahprotection
When
the voltage
conducting
is 0V7,
Via
the
switching
is
still
mode)
6.4.4
Ew-protectaon
generated
Overload
Undedoad
Over voltage
Under voltage
Horizontal
EW-Protection
Vertical
BIMOS
Set
there is no
SDA
Set is
restart.
No +SDb
standby via
power
Overload
Under load
Over voltage
Under voltage
the hold-circuitry
protection
protection
Protection
Protection
protection
lC71 19
can be
switched between
picture,
or SCL
switched
or +8Sc
supply
supply will
in
following
the
protection
mode
of 1C7520
2 seconds, immediately
is astivated.
mode.
When the
audible
the beam
across
and as soon
TS7450
will
mode
the set
present,
the set will
again.
deÍective
shorted
to
standby
protections
starts up
every 2
current
C2450 will
conduct, making PROT
of
(standby)
off and
(not
standby via
atgC
go
situations:
Íollowing
the
by
no OSD,
protections
power
--+
+
+
-+
-+
-+
-+
-+
standby
sound is
-+
standby line,
-+
line,
set tries to restart.
to a very
from
This
good
the
start circuit Íor
cycle is constantly
set is in hick-up
seconds.
becomes too
drop. D&50 will
as the voltage
power
the
on
Íor 21"
supply, the, set will stay
and
can only be reset by
via
the mains
switch
to standby
sets)
are
supply:
Hick
up mode
Hick up mode
Hick up mode
Hick
up mode
Supply
to standby
Supply
to standby
BIMOS
standby
(ErroÍ
code 1)
and ON, but
noise.
only
(Error
code 3)
tries
set
is
Set
switched to
audible hick-up
after that the
repeated in
mode
a short
high Íor a long
staÍt
drop across R34S6
high.
switch. lÍ the Íault
(protection
mode
to
period
in
The
EasVWest
the Easvwest
Note:
The current through
the LSP via
In
case oÍ a line
too high
rises.
to
and the voltage
When
conduct and
becomes HIGH.
high
(e.9.
when
switched
conduct
The
a
on with the mains
and EW-PROTECTION
East/West
cases:
1.
Bad contacts
.
bad contacts
r
bad contacts
.
bad contacts oÍ
2.
Bad
contacts
3. Shorted flyback
4.
Shorted S-correction
5. Bad solder
When
EW-protection
transistor
6.4.5
Vertical-protection
7420 may
The vertical
VERTICAL-PROTECïON
when
it is
the
interrupted,
mode.
functioning
BIMOS lC71
the BIMOS
In the BIMOS
oÍf the VDRIVE+
6.4.6
blanked.
line output
switch to
Software
The
It
Circuit breaker
stage will not work
hick-up
protection
software
continuously verifies
supply voltages
When
switch the
pÍotection
the
power
STANDBY line.
a squeaking sound.
protection
power
A cunent
is too high
part
precision
2
problem,
detects when
output
stage
through the
can be
in the line-deflectíon
the
EastArVest
resistors (R3483
the
easvwesÈcurrent
across resistors
the
voltage level
exceeds
STANDBY-SUPPLY
When the voltage
problem
line
ís
already
switch), D6zl81
protection
becomes
oÍ horizontal
deÍlection
of horizontal
oÍ linearity
S-correction
oÍflyback capacrtor
diode D6421
capacttoí C2427.
contacts in
output
has
also be
stage creates
line
the
been active, the line
defective.
pulses
correctly. These
19-4D
pin
on
37. When the
will
switch to BIMOS
STANDBY mode,
and VDRIVE-
'l463
may
and the
(under
mode
protection
pin
on
becomes
supply on
In
this situation
voltage
is
managed
presence
the
34 and the
active, the
and off continuously via
the current
with
TS7480
Easwest
caused by
is too
stage
a defective
circuitrv!
stage is measured
and
R3484).
becomes
R3483
and
0.6V, D6480
PROTECTION
across
C2480
is very
present
when
and D6,f82
is
activated very
active in the
Íast.
Íollowing
circuit:
deflection
corrector
coil
coil L542i
capacitoÍ
C2427
C2425.
D6423.
or
output stage.
output
at every flyback
pulses
are sensed
pulse
STANDBY
the BTMOS
while the
RGB outputs
be open. Probably,
power
supply will
protection).
by the microprocessor.
of the +5
activity oÍ
and
the l2C bus.
soÍtware will
the
power
supply
produces
through
high.
that
on
R3484
stans
the
set is
pulse
by
train is
switches
are
the
+8
the
The
EasVWest
standby
PROTECTION.
the
set will stay in
only
be
switch. lf
standby
protection
via the
signal line
Via
reset
by switching the
the Íault is
(protection
switches the
STANDBY-SUPPLY
the hold-circuitry
protection
the
still
mode)
set
present,
again.
mode
oÍf and on via the mains
the
power
power
of the
(standby)
will
set
supply
suppty,
and can
switch to
to
PCS
82 272GB
![](/html/ce/ce74/ce74a403390aa0160cb1dfa48239eeffd90ede20bc9b6db0fa3b7c42ea75674b/bg13.png)
Service
-
-
Modes,
protection
l'C
The
l2C
ThereÍore
condition.
repeatedly
and the
l2C-protection
.
SDA
.
SCL
.
SDA
When
and
the
.
SDÁ/SCL
the
LED
RED,
GREEN,
.
SDIy'SCL
LED
GREEN,
+SDb
+SDb
entire
microprocêssor
+SSDb
present.
míssing,
bus
is controlled
every
When
incorrect,
set
switches
is
shorted to
shoÍted
and
SCL shorted
SCL
or
SDA
LED lights
shorted when
mains
switch:
is
8 seconds RED,
8
seconds
flashes
shorted
is
I seconds
Ílashes
and +8Sc
and +8Sc
small
signal
senses whether
+8Sc
or
coming
When
one or
the
set switches
DST,
l2C
the defined
generated
protection
are the
at each l2O-command.
command
error
to software protection.
earth
to
earth
is
shorted,
in
a clearly recognisable
GREEN,
RED,
during
GREEN, flashes
RED,
procêssing
both the
has
start/stop
placed
3 is
in
the Íollowing
the
the
8 seconds
flashes
etcetera.
operation
ercetera,
of
the microprocessor
main
supply voltages
oÍ the
fÍom
the
supply
to soítware
Error
a defined
set tries to restart
set is
set.
the
supply voltages
power
starístop
condítion is
in
the enor buffer
situations:
pattern.
switched
GREEN, flashes
RED, 8 seconds
g
RED,
of the
pin
At
supply
voltages
protection.
messages,
6.5.2
with
ON
seconds
34 the
are
are
Fault Íinding
In
case of a
power
be simpliÍied to a
(low
risk)
Íollows:
as
part
Control
oÍ the
1. Disconnect
function
load
removing
any more and therefore will
oÍ the
jumper
power
in the
problem,
supply
stand alone
power
supply
the
power
(as
SSP
supply) or disconnect
9400 and R3400
LSP.
2.
Connect an external DC
pin
1 1C7520
to supply
big smoothing
3. Connect a oscilloscope
4. Turn
(via
a diode - e.g. BYDSÉID
pin
1 1C7520) and hot
capacitor C2505).
to test
up the
exteÍnal DC supply voltage
DC.
Remark:
The lC
statts at a supply voltage
after that the supply voftage
approx. 9V DC. At approximately
voftage
over
resulting in
DC
turning
a supply voftage
before a new staft-up
up the supply voftage
DC.
supply
power
the
power
supply
a result the line
no longer
(if present)
power
supply
between
(e.9.
earth
point
P4
at
protection
becomes
is
supply
can
at low voltages
will
not
be
the line
a
by
on the
supply
-
with
cathode
earth
oÍ the
g
pin
ICZSZO.
slowly to 17V
14V
of
DC,
can
drop to
18V DC,
adive,
drop
below 7V
performed
above
by
14V
6.5 Fault
Note
that
6.5.1
General
LED
andication
-
No
Set
problem.
-
LED
Set is in
defective.
-
LED
Set in SDM,
Audible
-
Demagnetisation
LSP.
-
EHT
only works
lor 21")
-
Hick-up
shorted.
transistor
finding
Íor
21'
sets, voltages
LED
after
is
switched
continuously
standby,
blinking
transmitting
checks
audible:
in
present.
is
sound
Check
TS7420.
and repair
start-up
OFF,
supply
part
control
error bufÍer.
audible:
supply
case
power
the LOT
mains voltage
is
operational
VOS (+140V
supply
(item
tips
and wave
procedure
problem
forms
or microprocessor
deÍective,
(line
for 25 & 29';
power
audible:
5430)
and the line
is
may differ.
completed
standby mode
present
is
output stage
at
+95V
supply is
output
The
5.
results
part (1C7520
correct
indicate
(measured)
a deÍect in the
peripheral
or
1 1).
Figure
6.2:
SV/div;
+
Energy tÍansÍer
part
is
OK)
6. Apply action 1
7.
Connect a
SuS/div
zlOKHz
pulse
power
oÍ the
2 and 4 as described
,
lamp
of 230V/100W across
capacitor C2569.
8.
Connect a
(connector
8L10) to switch the
Connect the mains connector
9.
at
0.
10.
Connect a voltmeter
between the
(21")
11.
Slowly increase
(in
avoided).
1kQ resistor
7L10)
drain of
and hot earth.
this way
further damage to the
and the STANDBY line
power
mains input
the
situation is
components
power
supply
displayed
supply
pins
at
(only
iÍ
earlier.
the VOS
between the +SSTANDBY
supply to normal
to a VARIAC
across C2569
TS7541
(25
voltage
(connector
and an oscilloscope
& 29)
or
by
power
supply can
in .
Other
control
10
or
control
output
operation.
but leave
TS7540
the
VARIAC
it
be
PCS
82 273
GB
![](/html/ce/ce74/ce74a403390aa0160cb1dfa48239eeffd90ede20bc9b6db0fa3b7c42ea75674b/bg14.png)
----------------
l
Protections,
The wave forms Íor
Mains
lOVAC:
2OV AC:
4OV AC:
65V AC:
>
In case
or the voltage will
1. Figure
2. Figure
3.
4. Figure 6.6:
Fault
6.5.3
When the horizontal
simplified to a stand alone'switched
voltages
1. Disconnect
2.
3. Conneot
4. Replace
5.
voltage
in
65V AC:
of a
6.3:
Mains in 10V
10v/div;
6.4:
Mains in 20V AC
20vldiv;
+ zlokHz
+
Figure
6.5:
Mains in 40V
S0V/div;
+
Mains in
S0V/div; SuS/div
+
+
finding oÍ the horizontal
(low
Discoínect the
current
(between
level
pulse
at the base
PCB).
Connect
FaultÍinding
the Íollowing
20kHz and VOS
40kHz
ztOkHz
zlOkHz
Stable situation,
feedback
exceed 140V
AC
1Ous/div
SuS/div
VOS3OV
AC
SuS/div
ulokHz
VOS8OV
65V AC
40kHz
VOS
circuitry itselÍ
risk)
as Íollows:
the
set
SSP
an eldemal
measurement
the HDRIVE
0 and
a oscilloscope
output transisto r 7
Possibilities:
1. Figure
6.7:
point
L3; test
transistor
S0V/div;
at collector
(7420)
lOps/div
Currertt Írom external
approx. 100m4
Obseruation: normal
and VOS
and
VOS
and VOS
problem,
pulse
pulse
pulse
14OV
Írom
mains.
removing
by
50V DC
possibility
by an
5V); duty cycle
oÍ TS7410
to test
42Q\.
line
DC
supply
pulses
l6kHz
mains
voltage
7V5
30V
80V
1,10V
40kHz
so
the
situation
(95V
with
circuitry
is
defective, h
mode
all cables to
(or
40V DC)
across
eliternal LF
(near
LOT
point
L1
output
and 100mA
and
aÍe
given:
Repair
and 140V
will not stabilise
21')
ffiffi
l+-t-t-L.trl-t-1-l-lJ
H*#fll-HrflH
fffiffiHtÏf\ffi
rfiiïftj-tH
n--|-rï-rrn-t
ffiffi
Ht+++-llt+i-t_1
Íïï]ïflï-ïïÏ]
F+#+fl-I-rt-fi
frrï--rm-n
ffiffiF
ffiffiffi
l-t--]----l-ff-1
ffiffi
ffi
n-n*-T-|-Ít
can be
supply"
C2400.
generator
50olo) with a t6
at the side
(collector
low
at
the SSp.
supply with
[fTL
of the
oÍ line
suppty
kHz
current
tips
Correct hóÍizontal
Note
that ihè amplitude
Írequency
2.
Figure
L3; test
transiBtor
S0V/div; lossidiv
Line
Current from e)dernal
appÍoximately
Obseruatlon:
Causes: horizontal
3. Figure
L3;
test
transistor
SoV/diq 1ops/div
Current
approx
Obseruatlon:
Cause: horizontal
When the line
only a number
does not
e)Íernal DC
4.
Figure 6.10:
L3;
test
transietor
1O0V/div;
Current ftom
approximately 150mA
Obseruatlon: flyback
Cause: flybackcapacitor
5. Figure
L3; test
transiÉtor
1OOV/div;
Curretlt from
Obseruatlón:
Cause:
generator.
of the
6.8:
point
at collector line output
(7420)
deflection open'.
small
supply current
linearity
S-conection C2427
6.9:
point
at collector line
(7420)
from
external DG
500m4 !!
fast oscillations
deflection coil shofted)
show the oscillation
supply
point
at collector line outpui
(7420)
1OpS/div
e)dernal DC
between, 150mA
6.11:
point
at clllector line
(7420)
1OrrS/div
external DC supply > 1A
2
from
short-circuit in
(e.9.
circuitry
oÍ the signal strongly
DC supply is
100m4.
pulse
followed
deflection
L5421
coil
supply
and 500mA suppty
deflection
deflection
of windings
is
not completely
are shorted, the wave Íorm
is
approximately
supply
time is shofter,
pulses per
cycle extra and
morethan 1A
picture
EHT
to Aquadag)
depends on the
by wide
coil open
open
open
pulse
and
output
cunent
(e.9.
shorted
and the curront of the
200fnA.
line
shorted but
is
one exta
supply
cunent
pulse
C2425 open
output
suppty current
tube
100mA
in
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Service
Modes,
DST,
Error
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6.5.4 Fault
the video
When
that there is
ïDA8366,
For
measuring,
the aeriAl input
oscilloscope
triggered
Normal
1 . First
16, | 7,
are
Figure
Red
CRT
1O0V/div
100us/div
The total
16 TDA8366
The TDA8366
TDA8366
<
> 4.5V :
2.
Secónd
measured
Red, line
measured.
-
-
Figure
Red
R43
(upper
SOV/divAC;
100!s/div
finding
"no
controller
there is
no
problem
a
the RGB
connect a video
with a white
field
with VDRIVE+
start up
phase
oÍ start up; 4 white
1 8)
and the main
better visible ff
6.12:
(pin
8 oÍ connector R43
panel)
and
DC:
beam
during
4.5V :
set remains
set continues
phase
and the main
16 is
differences
compensated
when
the
phase
with
6.13:
(lower
line)
on the
CRr
line)
sun
picture,
lC
picture
and
with
ampliÍiers or the
ftequent. A
at
procedure
the
green gun
current is measured and fed
19)
0C71
checks the voltage
these lines
of
start up; each beam is
Green
and
between
diffeÍences
3, otheruise it remains
(pin
8 of connector
panel)
(pin
6)
protection"
no
part
TDA8366-4C)
protection,
no
the BC_INFO caused
pattern
pin
picture
and
picture
generator (e.9.
to the tuner.
picture
stable
4
511.
measuring lines
picture
is muted
tube is
on the
(pin
6)
pin
at
phase
in this
up
start
with
picture
is
still muted.
line 17
is Blue. BC_INFO
the lines
are minimal the
(guns)
sreen
cold);
(problem
it is
most likely
by the
tube.
PM5518)
Trigger
is
obtained
(wave
1
6 of the
phase
separately
are
set continues
phase
in
[HfIFIl
'
f+JJq+t+{4q4
if
(lines
forms
back
to
2
Line 15 is
2
the
pin
is
l-TT-TH-tTf
.FlTTfmmm
H-i-lt_t-t-l
at
15,
in
start up
bright
picture
hangs in
phase
white hórizontal
is darlt
first
picture
6.12.
(1C71
The
1. A
the
(set
Oscilloscope
like figure
TDA8366
OK
There should be 4.5V
Possible
problem:
TD48366, there is
components)
2.
Small
rest
the
(set
hangs in second
In
horizontal rcd,
oÍ the
TDA8366 is OK
Possible
picture
Measure at
problem:
tube are bad
pin
R or G or B liÍle) is/are
ampliÍier(s) or
gun(s)
3. No lines visible
pin
Measure
-
0V:
-
5V:
-
Pulses
16
:
oÍ the set
19),
can be identiÍied:
line
phase
oÍ start up
oÍ the voltage
picture
tube
pin
at
16
iÍ there is
a defect
(in
at the top; the
procedure)
over
and RGB amplifrers
TDA8366.
present
no 4.5V
one
or more
the BC_INFO Íeedback
green
and
pictuÍe
is
phase
one or more
'16
TDA8366
smaller; the
is/are
(pictuÍe
TDA8366;
Check
blue lines at
dark
of start up
of the
which feedback line(s)
corresponding
Íaulty.
dark)
possible
TDA8366
measuremênts:
(sandcastle
supply voltage)
Check RGB
short
now there will
continuously
pin
16
amplifiers
TDA8366
be measuring
phase
5V,
bypassed)
there is a measuring line,
TDA8366
Measure
panel
is
OK
on cathode on the CRT
iÍ the measuring
present:
+
Yes
BC_INFO
no HEATER voltage
or
RGB
ampliÍier
rest
guns
the
at
looks
pin
oÍ the
loop.
the
procedure)
guns
oÍ
the
and the
ground,
to
lines
1
and 2
so the
lines are
circuit is open
problemNo
oÍ
are
16 oÍ
top;
(the
(at
is
3. After
staÍt up
cut-off
points
compensated
proceduÍe
RepaiÍ
Typical
situation:
-
Switch
-
In a 4:3
compressed"
-
In a 16:9
picture
the
of the R, the G and the B
continuously.
picture
no
the
set on.
"pictuÍe
press
set,
mode.
set,
shift down
the
present
is
and no eÍÍoÍ
size' to
switch the
picture
and differences
gun
are
codes
set to
with the
cursor keys.
in
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Protections,
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tips
PCS
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