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1
Colour Television Chassis
MG2.1E
AA
mg21frtp.eps
290798
ServiceManual
Content
1. Technical specifications 2 7. Electrical Diagrams and PWB lay-outs
2. Connection facilities, chassis overview 3 Diagram PWB
3. Safety instructions, maintenance, 5 Power Supply (Diagram A1) 35 36,37
warnings and Notes Line Deflection (Diagram A2) 38 36,37
4. Mechanical instructions 7 Frame Deflection / Frame Rotation (Diagram A3) 39 36,37
5. Service modes, DST, error messages, 9 Audio Amplifier (Diagram A4) 40 36,37
protections, faultfinding and repair tips including: Mains switch Panel (Diagram E) 41 41
Errorcodes-table 15 CRT / Scavem Panel (Diagram F) 42 43
Protection-structure (overview and detailed) 17 Tuner, IF, I/O, Video processing (Diagram K1) 46 44,45
Fault find tree 22 Input / Output (Diagram K2) 47 44,45
6. Block diagrams 29 Sound processing (Diagram K3) 48 44,45
Block diagram 29 Audio Dolby (Diagram K4) 49 44,45
(Supply, Deflection, CRT) Secam Correction (Diagram U) 49 49
Block diagram 30 Featurebox 6 (Eco) (Diagram K5) 50 44,45
(Video, Audio, Control) Video control & Geometry (Diagram K6) 51 44,45
Survey of testpoints 31 Teletext & Control (Diagram K7) 52 44,45
Oscillograms 32 Side I/O Panel (Diagram O) 53 53
Wiring diagram 33 Top Control Panel (Diagram P) 54 54
Overview I2C -ICs 33 DC Shift (Diagram G) 54 54
Supply lines overview 34 Diversity tables 55
8. Electrical alignments 57
9. Circuit Descriptions: not available (see Training
Manual) 63
10. Directions for use 64
11. List of abbreviations 75
12. Spare parts list 77
Copyright prior 9871
Subject in The Netherlands of Philips.
without theby COpermision Service Department
5
Printed to modification TV
Published reserved 1998 Philips Consumer Electronics B.V. Eindhoven, The Netherlands. All rights reserved. No part of this publication may be reproduced, stored in a retrieval system or transmitted, in any form or by any means, electronic, mechanical, photocopying, or 727 21622
4822 otherwise
©Copyright reserved 1998 Philips Consumer Electronics B.V. Eindhoven, The
Netherlands. All rights reserved. No part of this publication may be reproduced,
stored in a retrieval system or transmitted, in any form or by any means, electron-
ic, mechanical, photocopying, or otherwise without the prior permision of Philips.
Published by CO 9871 TV Service Department Printed in The Netherlands Subject to modification 5 4822 727 21622
2 MG2.1E 1 Technical specifications
Mains voltage : 220V - 240V (± 10%);
1 Technical specifications
50-60Hz (± 5%)
Aerial input impedance : coaxial 75
Minimal aerial voltage : 30µV (VHF), 40µV
(UHF)
Maximum aerial voltage : 180 mV
Programmes : 0-99
VCR programmes : 0, 90-99
2 Specification connections MG2.1E 3
2.1
2
Front connections
Specification connections
5- Blue v
6- Audio L (0.5Vrms 10k) j
7- Blue (0.7Vpp/75) j
8- CVBS-
TOP CONTROL FL7/FL8 status 0-1.3V:INT
STYLING
4.5-7V:EXT 16:9
3.5
AUDIO R
AUTO TV AUDIO L 9.5-12V:EXT 4:3 j
'IR-
SK 1 RECEIVER' SENSOR VIDEO
SVHS
9- Green v
(OPTIONAL)
'IR-SERVICE-LED' 10-
BICOLOUR
11- Green (0.7Vpp/75) j
STANDBY LED 12-
CL 86532057_top.AI 13- Red v
310798 14- RGB-
Figure 2-1 status v
15- Red (0.7Vpp/75) j
2.1.1 Audio/Video 16- RGB-
status 0-0.4V:INT
- Video 1Vpp/75 jq
- Audio L(0.5Vrms 10k) jq 1-3V:EXT/75
- Audio R(0.5Vrms 10k) jq 17- CVBS v
18- CVBS v
- Headpho 19- CVBS (1Vpp/75) k
ne (32-600 10mW) ot 20- CVBS (1Vpp/75) j
21- Earth
socket
2.1.2 SVHS
2.2.2 External 2 (in/out): SVHS+RGB+CVBS (intended for VCR.)
1- v
2- v
3- Y (1Vpp; 75) j
4- C (0.3 Vpp;75) j
1- Audio R (0.5Vrms 1k) k
2- Audio R (0.5Vrms 10k) j
2.2 Rear connections 3- Audio L (0.5Vrms 1k) k
4- Audio v
5- Blue v
See figure 2.2
6- Audio L (0.5Vrms 10k) j
7- Blue /
2.2.1 External 1(in/out): RGB+CVBS Chroma
out (0.7Vpp/75) j
8 - CVBS-
status 0-1.3V:INT
4.5-7V:EXT 16:9
9.5-12V:EXT 4:3 j
9- Green v
10- Easy link
11- Green (0.7Vpp/75) j
12-
13- Red v
L EXTERNAL 3 (OPTIONAL)
14- RGB-
R status v
AUDIO EXTERNAL 1 EXTERNAL 2 15- Red /
chroma-
CL 86532057_rear.AI in (0.7Vpp/75) j
310798 16- RGB-
Figure 2-2 status (0-0.4V:INT
1-3V:EXT/75)
17- CVBS v
18- CVBS v
19- Y/CVBS (1Vpp/75) k
1- Audio R (0.5Vrms 1k) k 20- Y/CVBS (1Vpp/75) j
2- Audio R (0.5Vrms 10k) j 21- Earth
3- Audio L (0.5Vrms 1k) k socket
4- Audio v
4 MG2.1E 2 Specification connections
2.2.3 External 3 (in): CVBS+Audio (optional) 4.5-7V:EXT 16:9
9.5-12V:EXT 4:3 j
9-
10-
11-
1- 12-
2- Audio R (0.5Vrms >10k) j 13-
3- 14-
4- Audio v 15-
5- 16-
6- Audio L (0.5Vrms>10k) j 17- CVBS v
7- 18- CVBS v
8- CVBS- 19-
status 0-1.3V:INT 20- CVBS (1Vpp/75) j
21- Earth
socket
F CRT/SCAVEM PANEL
TOP CONTROL PANEL P
O SIDE I/O PANEL
SHIELDING
K SMALL SIGNAL PANEL
MAINSWITCH PANEL E
LARGE SIGNAL PANEL A
CL 86532057_002.eps
170798
Figure 2-3
3 Safety instructions, Maintenance instruction, MG2.1E 5
3.1 Safety instructions for repairs When the set is used under normal circumstances, for
3 Safety instructions, Maintenance instruction, Warnings and Notes
example in a living room, the recommended interval is 3 to
5 years.
When the set is used in circumstances with higher dust,
grease or moisture levels, for example in a kitchen, the
recommended interval is 1 year.
The maintenance inspection contains the following actions:
· Execute the above mentioned 'general repair
1. Safety regulations require that during a repair: instruction'.
the set should be connected to the mains via an · Clean the power supply and deflection circuitry on the
isolating transformer; chassis.
safety components, indicated by the symbol , should · Clean the picture tube panel and the neck of the picture
be replaced by components identical to the original tube.
ones;
when replacing the CRT, safety goggles must be worn. 3.3 Warnings
2. Safety regulations require that after a repair the set must
be returned in its original condition. In particular attention
should be paid to the following points. h
As a strict precaution, we advise you to resolder the
solder joints through which the horizontal deflection
current is flowing, in particular: ('general repair
instruction')
· all pins of the line output transformer (LOT); 1. In order to prevent damage to ICs and transistors, all high-
· fly-back capacitor(s); voltage flashovers must be avoided. In order to prevent
· S-correction capacitor(s); damage to the picture tube, the method shown in Fig. 3.1
· line output transistor; should be used to discharge the picture tube. Use a high-
· pins of the connector with wires to the deflection voltage probe and a multimeter (position DC-V). Discharge
coil; until the meter reading is 0V (after approx. 30s).
· other components through which the deflection 2. ESD All ICs and many other semiconductors are
current flows. susceptible to electrostatic discharges (ESD). Careless
handling during repair can reduce life drastically. When
Note: repairing, make sure that you are connected with the same
This resoldering is advised to prevent bad potential as the mass of the set by a wristband with
connections due to metal fatigue in solder joints resistance. Keep components and tools also at this same
and is therefore only necessary for television sets potential.
older than 2 years. Available ESD protection equipment:
anti-static table mat (large 1200x650x1.25mm) 4822
The wire trees and EHT cable should be routed 466 10953
correctly and fixed with the mounted cable clamps. anti-static table mat (small 600x650x1.25mm) 4822
The insulation of the mains lead should be checked for 466 10958
external damage. anti-static wristband 4822 395 10223
The mains lead strain relief should be checked for its connection box (3 press stud connections, 1 M ohm)
function in order to avoid touching the CRT, hot 4822 320 11307
components or heat sinks. extension cable (2 m, 2 M ohm; to connect wristband
The electrical DC resistance between the mains plug to connection box) 4822 320 11305
and the secondary side should be checked (only for connecting cable (3 m, 2 M ohm; to connect table mat
sets which have a mains isolated power supply). This to connection box) 4822 320 11306
check can be done as follows: earth cable (1 M ohm; to connect any product to mat or
· unplug the mains cord and connect a wire between connection box) 4822 320 11308
the two pins of the mains plug; complete kit ESD3 (combining all 6 prior products -
· set the mains switch to the on position (keep the small table mat) 4822 310 10671
mains cord unplugged!); wristband tester 4822 344 13999
· measure the resistance value between the pins of
the mains plug and the metal shielding of the tuner 3. Together with the deflection unit and any multipole unit, the
or the aerial connection on the set. The reading flat square picture tubes used from an integrated unit. The
should be between 4.5 M and 12 M; deflection and the multipole units are set optimally at the
· switch off the TV and remove the wire between the factory. Adjustment of this unit during repair is therefore not
two pins of the mains plug. recommended.
4. Be careful during measurements in the high-voltage
The cabinet should be checked for defects to avoid section and on the picture tube.
touching of any inner parts by the customer. 5. Never replace modules or other components while the unit
is switched on.
6. When making settings, use plastic rather than metal tools.
3.2 Maintenance instruction This will prevent any short circuits and the danger of a
circuit becoming unstable.
It is recommended to have a maintenance inspection carried 7. Wear safety goggles during replacement of the picture tube
out by a qualified service employee. The interval depends on
the usage conditions:
6 MG2.1E 3 Safety instructions, Maintenance instruction,
3.4 Notes
1. The direct voltages and oscillograms should be measured
with regard to the tuner earth , or hot earth as this is called
(see fig. 3.3)
2. The direct voltages and oscillograms shown in the
diagrams are indicative and should be measured in the
Service Default Mode (see chapter 8) with a colour bar
signal and stereo sound (L:3 kHz, R:1 kHz unless stated
otherwise) and picture carrier at 475.25 MHz.
3. Where necessary, the oscillograms and direct voltages are
measured with and without aerial signal. Voltages in the
power supply section are measured both for normal
operation and in standby . These values are indicated by
means of the appropriate symbols (see fig. 3.3).
4. The picture tube PWB has printed spark gaps. Each spark
gap is connected between an electrode of the picture tube
and the Aquadag coating.
5. The semiconductors indicated in the circuit diagram and in
the parts lists are completely interchangeable per position
with the semiconductors in the unit, irrespective of the type
indication on these semiconductors.
6. Manufactured under license from Dolby Laboratories
Licensing Corporation.
7. DOLBY, the double D symbol and PRO LOGIC are
trademarks of Dolby Laboratories Licensing Corporation.
V
CL 26532098/042
140792
Figure 3-1
tuner earth hot earth
tuner aarde hete aarde
la masse du tuner la terre directe
Tuner-Erde heißen Erde
massa del tuner massa calda
tierra del sintonizador tierra caliente
with aerial signal without aerial signal
met antenne signaal zonder antenne signaal
avec signal d'antenne sans signal d'antenne
mit Antennensignal .ohne Antennensignal
con segnale d'antenna senza segnale d'antenna
con la señal de antena sin la señal de antena
normal condition stand by
normaal bedrijf stand by
fonctionnement normal position de veille
normaler Betrieb in Bereitschaft
funzionamento normale modo di attesa
funcionamiento normal posición de espera
Figure 3-2
4 Mechanical instructions MG2.1E 7
4.1 Removing the rear cover
4 Mechanical instructions
Side I/O assembly
A A
SSP - bracket
LSP - topbracket
A A
LSP - bracket
1
2
A
A 1
Bottom tray
A
2
CL 86532042_002.AI
240798
A A' A A Figure 4-3
or A or or A or CL 86532042_001.AI
160798
Figure 4-1 1. Remove 1 screw in case of a 2-scart I/O coverplate and 2
screws in case of a 3-scart I/O coverplate (see figure 4.2).
1. Remove the fixation screws (A) of the rear cover, notice 2. Remove the I/O coverplate by releasing the snap at the left
also the screw for the side-I/O, see figure 4.1. The screw A side. Pull the I/O cover plate to the left and then backwards.
is only valid for the 3-scart configuration. The I/O-bracket hinges at the right side. It can be removed
2. Remove the rear cover. now.
3. Pull backwards (about 8 cm) the bracket with the SSP and
the LSP. These brackets are not fixed to each other, but
4.2 Service positions can be repositioned backwards, as if they were one
bracket.
There are two predefined service positions: 4. Hook the brackets in the first row of fixation-holes of the
bottom tray; see figure 4.3. In other words re-position the
1. Service position for the top side (component-side) fixation from (1) to (2).
2. Service position for the bottom side (only valid for LSP)
(copper-side) 4.2.2 Service position bottom side (only for LSP)
4.2.1 Service position top side
CL 86532042_003.ai
090698
CL 86532042_005.ai
090698
Figure 4-2 Figure 4-4
8 MG2.1E 4 Mechanical instructions
2. Press the board upwards and remove the board from the
bracket.
4.6 Removing the top control board
Top control board
2
1
CL 86532042_004.AI CL 86532042_006.ai
240798
160798
Figure 4-5 Figure 4-6
1. Referring to previous Service position one must remove
1. See figure 4.6. Pull 2 clamps to the outer side.
the SSP and LSP from bottom tray by pulling back these
2. Top control board can be pushed down now, while it hinges
two panels.
still in the front.
2. Disconnect the SSP from the LSP bracket.
3. Now the board can be pulled backwards.
3. The two panels must be shifted some 25 cm to the right.
4. (If by accident the hinge in front is damaged or one of the
When doing this the side-assembly can be taken out of the
clamps is broken, the top control board can also be fixed by
hinge (see figure 4.4), and placed on the bottom tray.
2 screws.)
4. Either the LSP-topbracket must be removed first, or the
cabling from SSP to LSP (0310 and O311) must be re-
routed outside the LSP-topbracket to get room to position 4.7 Removing the side I/O board
these panels.
5. Turn the LSP 90 degrees anti clock wise and place the LSP 1. The complete Side I/O-assembly can be lifted out of the
in the hole of the bottom tray. If needed a screw can hinges and placed on the bottom tray of the set (see fig
reinforce the stability of this position (see figure 4.5) (see 4.4).
(2)). 2. The board can easily be removed out of the bracket by
6. The left front hook of the SSP panel can be fixed in a releasing the fixation clamps.
fixation-hole, that was used in previous service-position for
the right front hook of the SSP. See described movement-
action (1). (There is no right fixation hole.) 4.8 Removing the mains switch/LED board
4.2.3 (Service position bottom side SSP) 1. Release the two fixation clamps.
2. Pull the board backwards.
1. (See figure 4.3). Remove the two fixation screws of the
LSP-topbracket (one on the left hand side, one on the right
hand side).
2. Disconnect wirings from cable-clamps of LSP-topbracket.
3. In case the line transformer is changed by a bigger type a
part of the LSP-topbracket can be removed by breaking it.
4.3 Removing the LSP-top bracket
(4) 5) (6)
(
1. (See figure 4.3). Remove the two fixation screws of the (5) 4)
(
LSP-topbracket (one on the left hand side, one on the right
86532093_002.AI
hand side). 051198
2. Disconnect wirings from cable-clamps of LSP-topbracket.
3. In case the line transformer is changed by a bigger type a Figure 4-7
part of the LSP-topbracket can be removed by breaking it.
4.9 Mounting the rear cover
4.4 Removing the SSP from SSP-bracket
Before mounting the rear cover, check whether the mains cord
1. Release the three fixation clamps on the right hand side of is mounted correctly in the guiding brackets.
the bracket.
2. Press the board upwards and remove the board from the
bracket.
4.5 Removing the LSP from LSP-bracket
1. Release the two fixation clamps on the right hand side of
the bracket.
5 Service modes, error codes and protections MG2.1E 9
In this chapter the following paragraphs are included: Tuning frequency 475.25 MHz.
5 Service modes, error codes and protections
5.1 Test points TV-system for BGLM sets set to BG, for BGLL'I sets to LL'.
5.2 Service modes and Dealer Service Tool and ComPair All picture settings at 50% (brightness, colour, contrast,
(including fault finding tips related to CSM-mode) HUE).
5.3 Error codes All sound settings at 50% except volume at 25% (so bass,
5.4 Protections treble, balance at 50%, volume at 25%).
Fault find tree All service-unfriendly modes are disabled (like sleep timer,
child lock, blue mute).
5.1 Test points Entering the SDM can be done in 2 ways:
The MG2.1E chassis is equipped with test points in the service By the "DEFAULT" key on the DST while the set is in the
printing. These test points are referring to the functional blocks: normal operation mode.
By short-circuiting for a moment the two pins (pin 2 and 3
· P1-P2-P3, etc.: Test points for the power supply. of connector 0356) on the component side of the SSP with
· L1-L2-L3, etc.: Test points for the line drive and line output the indication "SDM" (activation can be performed in all
circuitry. modes except when the set has a problem with the main-
· F1K-F2K-F3K, etc on Small Signal Panel: Test points for processor).
the frame drive.
· F1F-F2F-F3F, etc. on CRT/Scavem Panel: Test points for Note: If the SDM is entered via the pins, all the protections are
the CRT-panel circuitry. de-activated.
· F1-F2-F3, etc. on Large Small Signal Panel: Test points for
the frame output circuitry. Exiting the SDM can only be done via the STANDBY
· S1-S2-S3, etc: Test points for the synchronisation command. By switching off-on the set with the mains switch the
circuitry. MG2.1E will come up again in the SDM.
· V1-V2-V3, etc: Test points for the video processing
circuitry. Service Alignment Mode (SAM)
· I1-I2-I3, etc: Test points for the Tuner/IF part. Specification of the SAM:
· A1-A2-A3, etc. on Small Signal Panel: Test points for the
audio processing circuitry. Software alignments (see chapter 8).
· A1-A2-A3, etc. on Large Signal Panel: Test points for the Option settings (see chapter 8).
audio amplifiers. Error buffer reading and erasing. The most recent error
· C1-C2-C3, etc: Test points for the control circuitry. code is displayed on the left side.
· T1-T2-T3, etc: Testpoints for the teletext circuitry. Operation counter.
· SC1-SC2-SC3, etc: Test points for the Scavem circuitry. Software version.
The numbering is done in a for diagnostics logical sequence; Entering the SAM can be done in 2 ways:
always start diagnosing within a functional block in the
sequence of the relevant test points for that functional block. By the > button on the DST while the set is in the normal
operation mode (or SDM). Enter the password '3-1-4-0'
5.2 Service modes, Dealer Service Tool and ComPair and press OK.
By short-circuiting for a moment the two pins (pin 1 and 2
of connector 0356) on the component side of the SSP with
For easy installation and diagnosis the dealer remote control
the indication "SAM" (activation can be performed in all
RC7150 is introduced. The RC7150 can be used for all new TV
modes except when the set has a problem with the
sets, including all set of the MG2.1E chassis. The RC7150 is
microprocessor).
also called Dealer Service Tool or DST. The ordering number
of the DST (RC7150) is 4822 218 21232.
Note: If the SAM is entered via the pins, all protections are de-
activated.
5.2.1 Installation features for the dealer
Exiting the SAM can be done via the MENU command or via
The dealer can use the RC7150 for programming the TV-set switching off-on the set with the mains switch.
with presets. 10 Different program tables can be programmed
into the DST via a TV-set (downloading from the GFL, MD2 or Customer Service Mode (CSM)
MG2.1 to the DST; see GFL, MD2 and MG2.1 service All MG2.1E sets are equipped with the 'Customer Service
manuals) or by the DST-I (DST interface; ordering code 4822 Mode' (CSM). This 'Customer Service Mode' is a special
218 21277). service mode which can be activated and deactivated by the
customer upon request of the service technician/dealer during
For explanation of the installation features of the DST, the a telephone conversation in order to identify the status of the
directions for use of the DST (4822 727 20073) are set. This CSM is a 'read only' mode, therefore modifications in
recommended (for the MG2.1E chassis, download code 4 this mode are not possible.
should be used).
Switching-on of the Customer Service Mode
5.2.2 Diagnose features for the servicer The Customer Service Mode will switch-on after pressing
simultaneously the "MUTE" knob on the remote control
The MG2.1E sets can be put in the two service modes via the handset and the "MENU" button on the TV for at least 4
DST RC7150. These are the Service Default Mode (SDM) and seconds. This activation only works if there is no menu on the
the Service Alignment Mode (SAM). The SDM and SAM can screen.
also be entered by short circuiting the relevant pins on the SSP.
Switching-off the Customer Service Mode
Service Default Mode (SDM) The Customer Service Mode will switch-off after pressing any
Specification of the SDM: key of the remote control handset (with exception of the
10 MG2.1E 5 Service modes, error codes and protections
"cursor-up" and "cursor-down" keys), or the buttons on the TV control handset after pressing the red button for picture menu
or by switching off the TV set with the mains switch. and selecting "contrast".
Detailed explanation of the Customer service Mode Line 7: LS Colour; gives the Last Status of the colour
After switching on the Customer Service Menu the following saturation, as set by the customer. The value can vary from 0
screen will appear: (colour is minimum) to 63 (colour is maximum). Colour values
can be changed via "cursor left" and "cursor right" keys on the
remote control handset after pressing the red button for picture
menu and selecting "colour".
CUSTOMER SERVICE MENU 1
Line 8: LS Headphone; gives the Last Status of the headphone
1 SW Version ............ volume, as set by the customer. The value can vary from 0
2 Code 1 ... ... ... ... ... (volume is minimum) to 24 (volume is maximum). Headphone
3 Code 2 ... ... ... ... ...
4 LS Volume .. volume values can be changed via the "cursor left" and "cursor
5 LS Brightness .. right" keys on the remote control handset after pressing the
6 LS Contrast .. green button for sound menu and selecting "headphone".
7 LS Colour ..
8 LS Headphone ..
9 Sharpness . Line 9: Sharpness; gives the sharpness value. The value can
10 Dolby ..... vary from 0 (sharpness is minimum) to 7 (sharpness is
11 Surround mode ............
maximum). In case of bad antenna signals a too high value of
the sharpness can result in a noisy picture. Sharpness values
can be changed via the "cursor left" and "cursor right" keys on
86532061_004.AI the remote control handset after pressing the red button for
230798
picture menu and selecting "sharpness".
Figure 5-1 Customer Service Menu 1
Line 10: Dolby; indicates whether the received transmitter
Line 1: Software version; the build in software version transmits Dolby sound (present) or not (not present). Attention:
(AAAABCX.Y) The presence of Dolby can only be tested by the software on
the Dolby Signalling bit. If a Dolby transmission is therefore
AAAA= MG21(chassis name) received without a Dolby Signalling bit, then this indicator will
B = E (Europe) show "not present" even though such a Dolby transmission is
C = 1 (language cluster) received.
X = main version number
Y = sub version number Line 11: Surround Mode; indicates the by the customer
selected surround mode. In case the set is a Non-Dolby set
Details on the software version can be found in the chapter there will be displayed "0". If it is a Dolby-set then is displayed:
"Software Survey" of the publication "Product Survey - Colour "Pro Logic", "Dolby 3 Stereo", "Hall" or "Off". For Dolby-set
Television". surround mode can be changed via the "cursor left" and "cursor
right" keys on the remote control handset after pressing the
Line 2: Code 1; gives the last 5 errors of the error buffer. As green button for sound menu and selecting "Surround
soon as the built-in diagnose software has detected an error settings".
the buffer is adapted.
By means of the "cursor-down" knob on the remote control
Line 3: Code 2; gives the first 5 errors of the error buffer. As handset the Customer Service Menu 2 will appear. By means
soon as the built-in diagnose software has detected