Philips MDl .2E User manual

Colour
television Chassis
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Seruice
4.
5.
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Contents
Technical
speciÍications
Connection
facilitiesand Chassis
overview
SaÍetyinstructionsfor repairs,
Maintenance
instructions,
Wamings
andNotes
Mechanical
instructions
Blockdiagram
Testooint
overview
Wiringdiagram
Copyright
1996 PhilipsConsumerElectÍonics
B.V. Eindhoven,
The
Neitíerl-ands.
All rights reserved. No part of this Publication
may be
reoroduced,storedjna retrieval
systeni
ortransmitted,
inany
formorby
arivmeans,
electronic,
mechanicá|,
photocopying,
or otherwise
without
théprior
permission
ofPhilips.
published
by
SM
9671TVService
Department
PrintedinThe
Netherlands
oCopyright
reservedSubiect
tomodification
Contents
Electrical diagrams and PWB-layouts
(Schéma
BB)
(Schéma
84)
(Schéma
85)
(Schéma
86)
(Schéma
87)
(Schema
BB)
(Schéma
89)
(Schema
C)
(Schéma
01)
(Schéma
D2)
(SchémÊ
D
(Schema
G)
(Schéma
l)
(Schéma
J)
l"g"
Diagram PWB
21 18
21 18
22 18
22 18
23 18
@ 4822727 20979
MDl
.2E
AA
í;ïiri?,'
Synchronisation
lFsound
EuroconnectoÍ
1
Euroconneetor
2
Controls
Connections
audio
module
Teletext
CRT
panel
Audio
module
NicamL module
CTI/Black
Stretch
panel
N/Soanel
Mains/RCS/LED
Panel
Control
andInpuvoutput
8. Electrical
alignments
10.Directions
Íoruse
11.ListoÍabbreviations
12. Spareparts
lists
t.
2.
3.
Page
2
2
3
4
6
7
8
8
Diagram PWB
12
13 14
15 14
16 14
17 14
17 14
19 18
20 18
6. Service
Modes,
DST,Errormessages,
Protections,
Faultfinding
and Repair
tips
7. Electrical diagrams and PWB-layouts
Supply
voltagediagram
Power
supply21" (Schéma
A1)
Powersupply
>21
" (Schéma
A1)
Horizontal
output (Schéma
A2)
Vertical
output (SchémaA3)
AudioampliÍier (Schéma
Aa)
Tuner+ lF (Schéma
81)
Videoprocessing (Schéma
82)
24 18
24 18
25 25
26 27
27 27
28 29
29 29
30 30
31 31
32
34
37
39
PCS
82264GB
#p PHILIPS

1. Technical speciÍications
Mains
voltage
Powerconsumption
nominal
output
power
(Vvatt)
peak
output
power
Watt)
standby
Watt)
Mainsfrequency
Pull-in
rangecoloursynchronisation
Pull-inrange
horizontal
synchronisation
| 22O-24OVAC (!1O"A)
: 100
(21'90");
130
(1
10"SF
4:3);
150
(1
10"
SF16:9)
: 160
(21"
90");
180
(1
10'SF4:3);220
(1
10'
$F 16:9)
: 3 (t10%)
: 50Hz
(t10%)
: >+300H2
: > +600H2
#
\? ?o
(
r1----------------a
o OqEo
(DGREEN
tÍ
r--------------'
t ?ooYt
--T-l-- oo
SK1
/+\
L7-\l
\ \:iï- MENU
:Íffi'-''" \:.2-
m-"-.
ileït-- "*"
ilq|- *-"
l[o+]- -*'
l#n
lo
|
*ï--'
lo+-
g-".-
*rH*
1-
2-
3-
4-
5-
6-
7-
8-
9-
10-
11
-
12-
13-
14-
15-
16- EXT1/75o)
17 - CVBS I
18 - CVBS J-
19- CVBSo(1Vpp/75O)
20- cvBS€(1vpp/75o)
21 - Earth screen
Audio O R(O.SVnrvrs< lko)
Audio € R(0.2-2Vnus>
10ko)
Audio G L(0.SVnrr,rs<
1kO)
Audio I
Blue I
Audio€ L(0.2-2Vnurs>
loka)
Blue o (0,n/pp/75o)
CVBS
status(o-2V:
INT;
4,5-7Vl
EXT1
-1
6/9;9.5-12V:EXT1
-4l3)
GreenI
GreenO (o,7vpp/75o)
Red I
RGBstatus
I
Red o (0,7vpp/75o)
RGBstatus
(0-0,4V:
INT;1-3V:
SVHS
@
2. Connection
facilities
andChassis
overview
Rearconnectlons
Specification
oftheterminal sockets
REAR
EXTI- CVBS
(in/cut)
+
RGB
(in)
-
tuner
atoutput
Front+Topcontrol
+Side l/O
EXT2 -CVBS
(in/out)
+
SVHS
(in)
-Input:
EXTz
then
output
=
tuneriinput:
other
then
outPut
=inPut
1 - Audio
OR(o.SVnrus<lk())
2 - AudioO R(0.2-2Vnr'irs>10ko)
3 - Audio
GL(o.SVnus<1ko)
4 - Audio I
5-
6 - Audio€ L(0.2-2Vnr'rs>10ko)
7-
8 - CVBS
status€ (G2V:
INT;4,s7V:
EXï2-
1
6/9
;
9.5-
1
2Y
:F-Kï2=a
|
3\
9-
'10
-
11
-
12-
13-
C
I
14-
15- c o(300mvppl75à')
16-
17 - CVBS I
18 - CVBS I
19- CVBS0(1vpp/75o)
20 - cvBslío (1vppi75o)
21 - Earthscreen
Front + Side control + Side l/O
Cinch
-audio
out
O ctucx AudioL(red)
I
(0.5Vnr',ls
<1kA)
O ctNcH
AudioR(whire) O
(0.5Vnus
<1kA)
FRONT
Audiofuideo
in
O crncn cvBSO (1vpp/75o)
O ctrucn
Audio
L(red) O
(2Vnr',rs
>10kO)
O ctttcHAudioR(white)
O
(2Vaus
>1OkO)
Headphone
I qn 8-600ei
1-r
2-I
3 Yo (1vppnso)
4 - co(o,3vpp/75o)
PCS82265GB

EE-i] TopcontmlPanetd#
EE3il Side
Controldild/oÍ InpuUOutput
E P28| cTu8reksrÍerchPanel
ElP.r6 I AudioModure
Wp.n1 Ni€mLPanet
CRTPanel E p.zul
E Pirl
E-p.ro l
EEI
EEf-l
E-r,,t
E-p.tl
EEzg]
E p.zcl
E-t 4l
Tuner
/ lF
Vids PÍocessing
Synórcnislion
lFSound
Euro ConnecloÍ 1
EuÍoConnsdoí2
ContÍols
Connections
AudioModule
Teleteí
, SideConlÍolor Top ContÍol presenl
1.
2.
.Z- y#"jt^csrueo
I nso-]
<9
PoweÍsupply Eilp.13Jd
HoÍizonlatoutput
E P.16-l
VerlicalOutput E P.1il
AudioAmpliÍier E P.t7l
N/SPanet EE r-l
66532068_001.41
Note:
This resoldering
isadvised to prevent
badconnections
dueto
metalÍatiguein solder
jointsand isthereÍoreonlynecessary
Íortelevisionsetsolderthan2 years.
- Thewiretreesand EHTcableshouldbe routedcorrectly
andÍixedwiththe mountedcableclamps.
- The insulationoÍthe mainsleadshould
bechecked
lor
external
damage.
- The mainsleadstrainrelieÍ
shouldbechecked
for its
tunctioninorder
to avoidtouchingthe GRT,hot
components
or heatsinks.
- The electricalDC resistance
betweenthe mainsplugand
thesecondary
sideshouldbechecked
(only
for sets
whichhavea mainsisolated
powersupply).
Thischeckcanbe doneasÍollows:
o unplug
the mainscord andconnect a wirebetween
thetwo
pins
oÍthemains
plug;
e setthe mains
switchto the on position(keep
the
mainscordunplugged
!);
. measuÍe
the resistance valuebetween
the pinsoÍthe
mainsplugandthe metalshielding
oÍthe tuneroÍ the
aerialconnectionon the set.Thereadingshouldbe
between
4.5MOand12MO;
o switchofftheTV and removethe wirebetween
the
twopins oÍthemains
plug.
- Thecabinet
shouldbecheckedÍor defects
to avoid
touching
oÍ any innerpaÍtsby the customer.
3. Safety
instructions
Íorrepairs,Maintenance
instructions,
Warnings
and
Notes
SaÍety
instructionsÍor repairs
SafetyregulationsrequiÍethatduringarepair:
- thesetshould
beconnected
tothe
mainsvia
anisolating
transformer:
- saÍetycomponents,indicatedby
thesymbol
a
shouldbereplaced
by
components
identicaltothe
originalones;
- when
replacing
theCRT,safety
goggles
mustbeworn.
Safety
regulationsrequire
thatafteraÍepairthe setmust
beÍeturnedin
'rts
originalcondition.
In
particular
attention
shouldbe
paid
totheÍollowing
points:
- Asastrict
precaution,
weadvise
you
toresolderthe
solder
joints
throughwhichthe
horizontal
deÍlection
current
isflowing,
inparticulaÍ:
o all pins
oÍthelineoutputtransformer
(LOT);
o fly-backcapacitor(s);
. S-@rrectioncapacitor(s);
o line
outputtransistor;
. pins
ofthe
connector
with
wirestothe
deÍlectioncoil;
o othercomponentsthrough
whichthe
deÍlection
currentÍlows.

Maintenanceinstructions
Itisrecommendedto have a maintenanceinspection
carriedoutbya qualiÍied seÍviceemployee.
Theinterval
dependsontheusageconditions:
r whenthesetisusedunder
normal
circumstances,
Íor
example
ina livingroom,therecommended
intervalis3 to 5 years;
r whenthesetisusedincircurnstanceswithhigher
dust,
grease
ormoisture
levels,
forexanrple ina
kitchen,the recommendedinterval is 1year.
ThemaintenanceinspectioncontainstheÍollowing
actions:
. executetheabovementioned
"general
repair
instruction";
. cleanthepower
supply
and
deflectioncircuitry
on
thechassis;
. clean
thepicture tube
panel
andtheneck
oÍ
the
pictuÍe
tube.
Warnings
1. Inorderto prevent damageto lcs andtransistors,all
high-voltageflashoversmustbeave,ided. Inorder1o
prevent
damage
to the picture tube,the method
shon'n
in
Fig.3.1
should
beusedtodischargethepicture tube.
Usea high-voltage
probe
anda multimeter
(position
DC-V)
Discharge
until
the meteÍreadingis0V (afierapprox.30s).
l
ESD IÈs.
All lCs and nrarry othersemiconductorsare sensitiveto
electrostaticdischarges
(ESD).
Carelesshandlingduring
repair
candrasticallyshortentheliÍe.Makesurethatduring
repair
you areconnectedbya pulsebandwithresistance
to
the samepotential
asthe earthotthe unit.
Keepcomponents
and
tools
also
atthis
same
potential
Togetherwiththe deÍlectionunitancjany multipoie unil,
theflat squarepicture
tubesused
forrnan integratedunit.
ThedeÍlectionandthemultipoleunits
aíesetopiimally
ai
theÍactory.Adiustmeni ofthisunitduringrepair
isthereÍore
notrecommended.
Be
careful
when
taking
measurementsin
thehigh-voltage
sectionandonthepicture tube.
Neverreplace
mocjulesorotheÍcomponents
whiletheunit
isswitchedon.
Whenmaking
settings,
useplastic ratheÍthanmetaltools.
Thiswillprevent
any short circuiisandtireciangei
oÍ a
circuitbecomingunstable.
The diÍectvoltagesand oscillogramsshould
bemeasured
withregardto thetuner earth(J), or hotearth(I{) astnis
iscalled.
The directvoltagesandoscillograms showninthe
diagrams
shouldbemeasuredintheService DeÍault
Mode (see chapter8) witha colourbarsignal
andstereo
sound(L:3kHz,R:1kHzunless
stated
otherwise)
and
picture
carrierat 475.25 MHz.
WheÍe necessary,the oscillograms anddirectvoltages
are
measuredwith (''ll-)
andwithoutaerialsignal([).
Voltagesinthe powersupplysection aremeasured
bothÍor
normaloperation
(@)
and instandby(O). Thesevalues are
indicated
by means of the appropriatesymbols.
The picture tube PWBhasprinted
sparkgaps.Each spark
gap isconnectedbetweenanelectrodeoÍthe picture
tube
andtheAquadagcoating.
The semiconductors indicatedinthe circuit
diagramandin
the partslistsarecompletely
interchangeable
per
position
withthe semiconductors
intheunit,inespective
oÍ
thetype
indication
onthesesemiconductors.
Figure
3.1
DCtpoLBY
sunnounol
PRO
o
LOGIC
ManuÍactured
underlicensefrom DolbvLaboratories
l-icensing
Corporation.
DOLB'/,
thedouble-Dsymbol
D! andPRO
LOGICare
trademarksoÍ DolbyLaboratories LicensingCorporation.
Notes
1.
2.
3.
4.
5.
2.
3.
6.
4.
5.
6.
PCS
82266GB

4. Mechanical
instructions
The
MD1.2E
chassishas
two
different
mechanical
executions.
Styling
withtopcontroland
side
inpuVoutput
(also
applicableÍor MD1.1E
Widescreen)
Removing the Íear cover
1. First
allscrewsonthe rearcoverhaveto be removed.
. 4 Screwsarelocated
ateachcornerof the cabinet.
. 2 Screws
arelocated
atthe leftand rightbottom
cornersoÍthe rearcover.
. 4 ScrewsareÍixedatthe4 corners
oÍthe l/O panel
withthe Euroconnectors
andaerialinput.
2. The rearcoverisnow heldin position
by6 clicks
between
the cabinetandthe rearcover.Thereare
2 clicks
at the left,2 at the right
and 2 at thetop.After
loosening
allclicks(byreleasing
themwitha screw-
driver),
the rearcovercan be removed.
3. The coverplate
onthe l/O panel
withthe Euro-
connectoÍs
andaerialinputcanbe removedinthe
following
way:remove
thescrewinthe middle,release
theclickconnection
at the bottom
and lift
the cover
plate.
Processposition
Theprocess positionprovides
easier
access
to theentire
chassis.
1. Release
the mainscordÍrom itsÍixationbrackets.
2. Pushbackthe clicksbetween
bottom
plateandrear
coverand pull
thecabinet
atthe sametime backwards.
For some service positions cablesmay have to be removed
from their cable clamps and channets.
AÍterwards, put the cables back in their original position.
Click
(1)
Service
positions
Small
SignalPanel
(SSP)
componentside (Figure
4.1)
1. Push
downthe clicksoÍ the SSPbracket(1)andshift
the SSPto the lefi.
2. Pullupthe SSPand tiltthe SSPcounter
clockwise
to a
horizontal
position(180'with Large
Signal
Panel
(LsP)).
3. Putthe SSPinthe clicks(2)marked
"Sewice"
onthe
bottom
plate.
Whenallcablesonthe SSParedisconnected,
theSSPcan
alsobe removedfrom itsbracket(Figure4.2),providing
betteraccessto component
andcopperside.
bracket
_014.41
071096
4.1
PCS
82267GB
Figure4.1

LSP component side (Figure4.3)
1. Putthe SSP inthe horizontal
service
position
as
described
above.
2. Removescrew (3)fromthe LOTbracket.
3. Removethe bracket
byreleasing
click(4)andpulling
the
bracketupwards.
4. Release
clicks(5)and (6).
5. Liftthe LSP PWBoutof itsbracket
(indicated
bythe
arrow)and pull it a little
back.
Warning! The heat sinksarc not connected to ground.
LSP copper side x/ith table/workbencá (Figure 4.4)
1. Disconnectthe cableto the degaussing
coil(yellow
connectorL02on LSP).
2. lÍ necessary,
disconnect
the cable
on the leftloudspeaker.
3. Liftthe LSPÍrom its bracket
asdescribed
above (LSp
component
side).
4. Turnthe LSPundemeath
the CRTpanel(keep
cable
515/L15
UNDER
the
audiomodule)
asindicated
bythe
arrow (7).
The LSP now restsonthe bottom
plate,heldinplacebythe
cableclampon the heatsinkandthe LOT bracket.
Warning! Be careful not to damage the CRT-panel or
picture tube neck.
The heat sinksare not connected to ground.
SSP and LSP copper si]dewithout tabte/workbench
(Figure 4.5)
For this seruice positionMDl cable extensionkit
(service code number 4822 320 11695)is required.
1. Breakthe servicepin (marked
M't - see Figure4.3)from
itsposition
at the right handsideoÍ the bottom
ptate.
2. Disconneqt
the cableto the degaussing
coil(yellow
connectorL02on LSP)
andthecableonthe left
loudspeaker.
3. Remove cables
510/L10,
511/L11and51
5/L15Írom
LSPto SSPand cablel28lL28
ÍromAudiomodule
to LSp.
4. Liftthe LSPlrom itsbracketasdescribed
earlier(LSP
component
side).
5. Putthe LSP to thevertical
position
(Figure
4.5),copper
sideatthe righthand,LOTabove(8).Forthisposition,
specialgroovesare madeinthe bottomplate
ofthe
cabinet.
6. Fixthe position
oÍthe LSPby putting
theservice
pin
betweenLSP (heat
sink)and bottom
ptate(9).
Thereare
specialholesinthe heatsinkandthe bottom
plate
to put
the servicepin in.
7. Reconnectcable
128/128.
8. Usethe cablesÍromthe MD1cableextension
kitto
reconnect
connectors
S10/L10, S1 1
/L1
1and51
S/LiS.
Warning! All cables should be reconnected correctly.
Afterusethe servicepincanbe placedinthe spareholeat
the righthandside inthe bottom plate.
Clip(6)
Click
(4)
Figure4.3
Figure4.4
c166532052_015.Al
110996
665320s2017.41
Figure4.5

Mechanical
instructions
4.2
Accessingthemodulewithmainsswitch,
LED
and
RC5
receiver
(Fig.4.6)
1. Cut
thetierap
ofthedegaussing
coilatthelefthand
bottomside
(10).
Removethe
degaussingcoilintheleft
bottomcorner
Írom
its
Íixationbracket
(1
1)
toget more
spacetohandlethemains
module.
2. Remove the
redmains
pànel
bracketby
lifting
theend
and
pulling
itbackwards
(12).
3. Toget
more
movement
space,the
lefttopofthecabinet
can
be
pushed
orpulled upwards
(13).
4. Themains
panel
cannowbe
removed.
Afterwards
the
degaussingcoilshould
be
retiedatposition
(10).
Styling with side control and side inpuVoutput (notop
control)
Removing
ttrerear
cover
1. First allscrewsonthe
rear
cover
have
toberemoved.
. 6Screwsarelocatedatthe
comersoÍthecabinet.
. 2Screws
aÍe
locatedatthe
leftand
right
bottomoÍ
therearcover.
. 3Screws
arelocated
just
above,
underandleftoÍthe
cover
plate
ofthe
UO
connections.
Fotsomeservice
positions
cables
may
havetoberemoved
íromtheircableclampsandchannels.
Aftenttards,
putthe
cablesback
intheiroriginal
position.
Process position
The
processpositionprovides
easier
accesstotheentire
chassis
duringthe
service
posltions.
1. Thechassis canbe
lifted,
pulled
Íorward
(t Scm)and
fixedinthebottom
plate.
2. Whentheclicks
between
bottom
plate
rearcoverare
pushed
back,thechassisand
thebottom
plate
canbe
pulled
backwards.
Service
positions
SSPcopperandcomponentside,
moduleservicing
(Figure
4.7)
'1
. Releasethe
clickconstruction
(14)
betweentheSSPand
LSP.
2. LifttheSSPalittleandturn
ittoanangleoÍ135'
(15)
or
180"
(16)
ÍromtheLSP.
This
provides
betteraccess
tothe
clmponent
sideoÍthe
SSPandalsoallows
fortheremoval
oÍmodules.
Service
position
withtable/workbench
(Fig.
4.8)
1. Disconnectthecable
tothe
degaussing
coil
(yellow
connectorL02onthe
LSP).
2. Lifi the
chassis
from
thebottom
plate
and
pull
it
backwards
(17).
3. TurntheentirechassisaroundtheCRT
panel(18).
The
chassisrests
on
theSSP
withthe
coppersideof
the
LSPbackwards.
Becareful
nottodamage theCRT-panel
or
picture
tube
neck.
Theheatsinks
arenotconnectedtoground.
(10)
(1
1)
(12)
66532052_018.Al
071096
Figure4.6
Figure
4.7
66532052_019.Al
250996
(14)
Warnlng!
FiguÍe4.8

Service position (LSPcopper side) without table/
workbench(Fig.4.9)
1. Disconnect thecable tothedegaussing coil
(yellow
connector
L02onthe LSP).
2. Liftthe chassis
Íromthe bottom
plateandturn it
counter
clockwise
(1
9).
3. The SSP can beÍixedwitha screwdriver tothe bottom
plate(20).
The coppersideofthe LSPcan nowbe
accessed.
Waming! Be careful notto damage the CRT-panelor
picture tube neck.
The heat sinksare not cannected to ground.
SmallSignalPanel
(Fig.4.2)
First,remove
allcablesconnected to the SmallSignal
Panel.The SSPcan be removed
byslidingitoutofthe
SSPbracket
(in
the direction ofthe arrow).
LargeSignalPanel
(Fig.4.10)
After removingthe screw(21), andpushing backthe clips
(22),
the LSPcan be liftedoutthe bracketas indicatedby
thearrow.
Accessing the panel with mains switch, LEDand RCS
ÍeceiveÍ
The mainsmoduleislocated inthe middleoÍthe set.below
thepicture tube.
1. Pushthe clicksbetweenbottom
plateand rearcover
backand pullthe chassisbackasÍar as possible.
2. ReleasetheclickconstÍuction
(14
- Fig.4.7)
between
the SSP and LSP,liftthe SSPa littleandturn itto an
angleoÍ 180' (16
-see
Fig.4.7)lromthe LSP.
Themainspanelcannowbe accessedwhenreaching
over
the SSP/LSP.
3. Remove the 2 screwsleftand rightonthe mains
panel
bracket.
Thecompletemains
panelcannowbe removedby
pulling
itbackwards.
Figure4.9
cffi262 02.A1
-i1ffi
Figure4.10
PCS
82268
cB

I
PANEL
5.B|ockdiagram/B|ockscha|tbi|d/Schéma.bloc@r
7l
I
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