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Service ManualColour Television
TX-32PM1TX-28PM1
GP4 Chassis
SPECIFICATIONS(Information in brackets [ ] refers to model TX-28PM1)
SERVICE HINTS ...................................................................................................................................................................... 3
SERVICE POSITION ................................................................................................................................................................ 4
ADJUSTMENT PROCEDURE AND SELF-CHECK.................................................................................................................. 5
PARTS LOCATION................................................................................................................................................................. 12
REPLACEMENT PARTS LIST................................................................................................................................................ 13
1. It is advisable to insert an isolation transformer in thea.c. supply before servicing a hot chassis.
2. When servicing, observe the original lead dress in thehigh voltage circuits. If a short circuit is found, replaceall parts that have been overheated or damaged bythe short circuit.
3. After servicing, see that all the protective devicessuch as insulation barriers, insulation papers, shieldsand isolation R-C combinations are correctlyinstalled.
4. When the receiver is not being used for a long periodof time, unplug the power cord from the a.c. outlet.
5. Potentials as high as 32,9kV [32kV] are present whenthis receiver is in operation. Operation of the receiverwithout the rear cover involves the danger of a shockhazard from the receiver power supply. Servicingshould not be attempted by anyone who is notfamiliar with the precautions necessary when workingon high voltage equipment. Always discharge theanode of the tube.
6. After servicing make the following leakage currentchecks to prevent the customer from being exposedto shock hazard.
LEAKAGE CURRENT COLD CHECK1. Unplug the a.c. cord and connect a jumper between
the two prongs of the plug.2. Turn on the receiver’s power switch.3. Measure the resistance value with an ohmmeter,
between the jumpered a.c. plug and each exposedmetallic cabinet part on the receiver, such as screwheads, aerials, connectors, control shafts etc. Whenthe exposed metallic part has a return path to thechassis, the reading should be between 4M ohm and20M ohm. When the exposed metal does not have areturn path to the chassis, the reading must beinfinite.
LEAKAGE CURRENT HOT CHECK1. Plug the a.c. cord directly into the a.c. outlet. Do not
use an isolation transformer for this check.2. Connect a 2kΩ 10W resistor in series with an
exposed metallic part on the receiver and an earth,such as a water pipe.
3. Use an a.c. voltmeter with high impedance tomeasure the potential across the resistor.
4. Check each exposed metallic part and check thevoltage at each point.
5. Reverse the a.c. plug at the outlet and repeat each ofthe previous measurements.
6. The potential at any point should not exceed1,4 Vrms. In case a measurement is outside the limitsspecified, there is a possibility of a shock hazard, andthe receiver should be repaired and rechecked beforeit is returned to the customer.
X-RADIATION WARNING1. The potential sources of X-Radiation in TV sets are
the high voltage section and the picture tube.2. When using a picture tube test jig for service, ensure
that the jig is capable of handling 32,9kV [32kV]without causing X-Radiation.
NOTE: It is important to use an accurate periodicallycalibrated high voltage meter.1. Set the brightness to minimum.2. Measure the high voltage. The meter should indicate:
32kV ± 0,9kV [31kV ± 1kV].If the meter indication is out of tolerance, immediateservice and correction is required to prevent thepossibility of premature component failure.
3. To prevent any X-Radiation possibility, it is essentialto use the specified tube.
HOT CHECK CIRCUIT
a.c. VOLTMETER
WATER PIPE(EARTH)
TO INSTRUMENT'S EXPOSEDMETALLIC PARTS Fig. 1.
2kΩ 10 Watts
2
SERVICE HINTSHow to remove the rear cover1. Remove the 11 [9] screws as shown in Fig.2.
LOCATION OF CONTROLS
3
Fig. 2
SCREWS SCREWS
Fig. 3
L-Board Focus G-BoardScreen D-Board
HOW TO MOVE THE CHASSIS INTO SERVICE POSITION1. Remove the bead clamper from the mains lead.
2. Hold and lift the rear of the chassis and gently pull the chassis towards you, as shown in Fig.4.
3. Release the respective wiring clips and rotate the chassis horizontally through 90° anti-clockwise.
4. Locate the chassis to position Fig .5. : 5. After servicing ensure all wiring is returned to its original position before returning the receiver to the customer.
4
Fig.4 .
Fig. 5.
ADJUSTMENT PROCEDUREItem / Preparation Adjustments+B SET-UP1. Receive a Window pattern.2. Set the controls :
CUT OFF / Ug2 Test1. Receive a Window pattern.3. Set:
Colour 50%Brightness 50%Contrast 100%
To adjust Cutoff connect an oscilloscope to the Blue cathode. Adjustthe screen VR until the black level is 160V ± 2V.
SELF CHECKSelf-check is used to automatically check the bus lines and hexadecimal code of the TV set.To enter Self-Check mode, pressthe STATUS button on the remote control and at the same time press the down (-/v) button on the customer controls atthe front the TV set. To exit Self Check, switch off the TV set at the power button.
ALIGNMENT SETTINGS(The figures below are nominal and used for representative purposes only.)1. Set the Bass to maximum position, set the Treble to minimum position, set the Volume to minimum then press the
down button (-/v) on the customer controls at the front of the TV and at the same time press the INDEX button on theremote control, this will place the TV into the Service Mode 1.
2. Press the RED / GREEN buttons to step up / down through the functions.3. Press the YELLOW / BLUE buttons to alter the function values.4. Press the OK button after each adjustment has been made to store the required values.5. To exit the Service Mode, press the "N" button.
Alignment Function Setting indicationNote: All setting values are approximate Settings / Special features
EAROM copy TV/EXT ---
FLASH program copy EXT -> TV ---
Horizontal Position H-Pos -15 Optimum setting.
Vertical Position V-Pos 10 Optimum setting.
Horizontal Amplitude H-Amp 85 Optimum setting.
Vert. Amplitude V-Amp22 Optimum setting.
EW-amplitude EW-Amp 1 - 20 Optimum setting.
Lower Corner Lower Corner5 Optimum setting.
Trapezium-comp Trapez 1 -4 Optimum setting.
Upper Corner Upper Corner 3 Optimum setting.
Vertical Linearity V-Lin24 Optimum setting.
Vertical Symmetry V-Sym -12 Optimum setting.
Angle Angle 2 Optimum setting.
Bow Bow -2 Optimum setting.
DVCO DVCO -1
Receive a PAL Colour Bar Pattern. ForDVCO alignment press "Blue" button, waituntil the figure colour is changed from redto black colour.
HighlightLowlight
High 0451 0401 0380Low 0270 0277 0256 Optimum setting.
Sub-Brightness Sub-Brightness7 Optimum setting.
7
VID
EO &
STE
REO
AU
DIO
BLO
CK
DIA
GR
AM
8
R
5 3 4
5 3 4
CR
T
L-B
OA
RDIC
351
12
3B
7G
8
R 9
Q35
4
D36
2
D36
3
D36
4
L2
D15
IC60
1
16 IF
1
VCT4
973G
-PZ
17 IF
2
AA_R_VCT 32 AA_G_VCT 31
AA_B_VCT 30
71 AA_BOUT
72 AA_GOUT
73 AA_R OUT
X201
AV1
21
PIN
SC
AR
T
20 VIDEO IN
15 R IN
11 G IN
19 VIDEO OUT
7 B IN
6 L IN
3 L OUT
2 R IN
1 R OUT
AV2
21
PIN
SC
AR
T
20 VIDEO/Y IN
19 VIDEO OUT
6 L IN
3 L OUT
2 R IN
1 R OUT
IC23
01A
UD
IO O
UTP
UT
4 R
IN
2 L
IN
L OUT P 12
L OUT M 11
RL
JK3201
VL
R
1 2 3 G3G
-BO
AR
D
D-B
OA
RD
5 2 3
5 2 3
D21
G214
1 2 3
D18 4
RL
G4 2 14 3
R OUT M 9
R OUT P 8
TUN
ER
10
JK23
01
Q23
03
Q30
1
LR
L R
L(0)
L(1)
R(1
)
R(0
)
L
HEA
DPH
Fron
t AV2
term
inal
15
42
36
7
R G B
11
4 AA_SPEAKL
5 AA_SPEAKR
AA_A
VVC
TL 8
AA_A
VVC
TR 9
AA_A
MO
UTL
10
AA_A
MO
UTR
11
AA_AV1_CVBS 33
AA_AV2_C 34
AA_AV2_CVBS 35AA_A
V3_C
36
AA_A
V3_Y
37
AA_A
V3_C
VBS
38
AA_AV1_OUT 40
AA_AV2_OUT 41
IC23
03A
UD
IO S
WIT
CH AA_AV1_IL 4
AA_AV2_IL 5AA_AV3_IL 6
AA_AV1_IR 25
AA_AV2_IR 24
AA_AV3_IR 23
AA_AV1_OL 12
AA_AV1_OR 13
AA_AV2_OL 14
17 A
A_A
MO
UTR
16 A
A_A
MO
UTL
AA_AV2_OR 15
AA
_RFO
UTL
6A
A_R
FOU
TR 7
9 AA
_RFO
UTL
20 A
A_R
FOU
TR 15 C_IN
CY
7 6
7 6
Q30
2
Q30
3
Q30
4
Q30
5
Q30
6
Q23
01
Q23
04
Q23
02Q
605
Q60
6
Q35
3
Q35
2
Q35
1
66
82 AA_SENSE
POW
ER S
UPP
LY B
LOC
K D
IAG
RA
M
9
AU
DIO
OU
TPU
T
D -
BO
AR
D
1 4
S840
RL8
01
G5
Mains In
+
~
D80
3A~F8
40Li
neFi
lter
L831
Line
Filte
r
L832
PFC
Filte
r
L804
A
D80
2
D80
1
1 2G7
Degausscoil
1 3G6 5
IC80
1PO
WER
SUPP
LY
43
6
1
1 3D6 5
R82
2R
823
T801
B1P1P2
S6 S7 S4 S1S5D
872
D88
3
D86
6
D84
8
D84
9
D87
0
Q84
6
Q84
7
Q85
0
D86
7
D86
8
IC80
2R
EG8V5V
10,5
V
6,5V
T551
9 72
1
IC45
1VE
RTI
CA
L2,
6
4
D55
2
D51
3
D51
5
TUN
ER
3 4D1 7
1D4
15V
D88
1
D88
2
5V_S
BY
T553
3
1 3D5
79
5V
3 4G1 7
1L21 3L3
IC35
1R
GB
OU
TPU
T
6
L - B
OA
RD
8V
Q84
1
IC19
00G
EOM
AGN
ETIC
CO
RR
ECTI
ON 10
D10
61Q
1900
RC
LED
6,5V
3,3V
_SB
Y5V
_SB
Y10
,5V
Q90
6
215V
Q35
4
Q90
8
G -
BO
AR
D
POWER BUS
IC86
0
-14V 14
V
142V
R88
730V
142V
IC10
62
12
400V
STR
_Vcc
D83
7
D83
6
4 1
8 5
VCC
R00
3
R80
1
IC85
4AR
EG
1 3
5
IC85
7R
EG2
1
IC85
2R
EG2
1IC
855
REG
12
IC85
1R
EG
12
67
D89
2
IC85
6AR
EG
1 3
5
D88
4
D89
7
D87
4
D87
3
3,3V5V_
DEF
3,3V
_SB
Y
1,8V
_SB
Y
IC60
1VC
T497
3G-P
Z
2 8V
19,2
0,87 5V
_DEF21
,64,
68 3,3V
24,4
3 1,8V
_SB
Y46,6
5 3,3V
_SB
Y
IC60
5
16
5V_S
BY
IC23
01
7 15V
5 5V
IC23
033
AU
DIO
SWIT
CH
IC60
2
16
5V_S
BY
POR
TEX
PAN
DER
IC60
3
2 3,3V
_SB
Y
IC11
03
8 3,3V
_SB
Y
EAR
OM
RES
ETI C
SW
ITC
H2
D86
4
D86
9
R86
9
10,5
V
9V8V
5V_S
BY
1313
3,3V
_SB
Y
10,5
V
6,5V
2D7
SERVICE
5V_S
BY
PO
WER
BU
S
D82
5R
825
142V
6,5V
10,5
V
CO
NTR
OL
BLO
CK
DIA
GR
AM
10
IC60
1M
ICR
OPR
OC
ESSO
R
51 K
EYSC
AN
TUN
ER5
SDA
4 SC
L
LOC
AL
KEY
SSW
ITC
HIN
GM
ATR
IX
52 S
LOW
1
53 S
LOW
2
RESET 18
47 L
ED
3,3SDA 58
3,3SCL 57
VCT_
MU
TE 4
9
XTAL2 26
XTAL1 25
5 6D7
RM
7 8
SERVICE/TEST
AV1
21
PIN
SC
AR
T A
V2 2
1 PI
N S
CA
RT
1 2D1 5
1 2G1 5
LED
RM
KEY
SCA
N
LED
G -
BO
AR
D
56 R
M
8 SLOW1
8 SLOW2
12 SDA_SW2
10 SCL_SW2X6
01
D -
BO
AR
D
D21
07
10 AV LINK2
Q11
05
Q11
06
AV
LIN
K O
UT
28
AV
LIN
K IN
27
ST/
ON
50
Q85
7
48 G
EO6
6
Q19
00
IC 1
900
GEO
MAG
NET
ICC
OR
REC
TIO
N
GEO
POW
ER S
UPP
LY
REM
OTE
IC10
62
AG
C 1
4
1 AG
C
RM
SDA
SCL
KEY
SCA
N
D10
61
Q11
04
Q11
074
AV_
LIN
K
IC60
59
Q_S
W
SWIT
CH
2 3,
3SC
L
3 A
V_LI
NK
2
10 S
ERVI
CE
12 S
DA
_SW
1
13 S
DA
_SW
2
14 3
,3SD
A
15 S
CL_
SW2
VPR
OT
59
6 M
UTE
IC23
01LA
4207
2
SC
L 27
IC23
03A
UD
IOSW
ITC
HSD
A 2
8
SC
L_SW
1 6
IC11
03EA
RO
MSD
A_S
C1
5
SC
L 1
IC60
2PO
RT
EXP
SDA
2
Q60
2
Q11
10Q
1111
LEVE
L SH
IFTE
RSD
ASC
L
3,3S
DA
3,3S
CL
Q_S
W 7
SER
VIC
E 6
10 R
EG_O
N_O
FF D
ISA
BLE
3,5
IC85
1ST
V813
1
9 D
EGA
USS
99
DEG
AU
SS
Q84
1
1 OUTIC
603
RES
ET
Q10
62
Q60
8
Q23
05
Q21
01H
W M
UTE
Gen
erat
ing
unit
MU
TE_M
ON
ITO
R
D60
1
FBIN
78 16 FBIN
Q60
3Q
604
AB
_PR
OT1
6
RL8
01
5VQ
2301
Q23
03
D21
08
Q87
1
DEF
LEC
TIO
N B
LOC
K D
IAG
RA
M
11
IC601MICROPROCESSOR
EW
83
H-O
UT
60
IC45
1VE
RTI
CA
L71T5
53
T551 10
V- 8
4
V+
85
Q50
1Q
551
Q70
2
GEO
48
6G1
6D1
IC19
00G
EO6
8Q
1900
1 2G9
ROTATIONCOIL
2
1D10 3 4
DEFLECTION
D -
BO
AR
DG
- B
OA
RD
5
14 6
DIO
DE
MO
DU
LATO
R
Q70
3Q
701
HFL
B 6
1
6 V
PRO
T 59
D60
1 V
FLB
Q70
4
PARTS LOCATION
12
NOTE:The numbers on the exploded view belowrefer to the exploded view section of theReplacement Parts List.
10
5
3
14
17
20
21
1
15
6
13
4
8
7
9
2
12
19
16
18
11
Components Identified by mark have special characteristics important for safety.* When replacing any of these components, use only manufacturers specified parts.In case of ordering these spare parts, please always add the complete Model-Type number to your order.
REPLACEMENT PARTS LIST
Important Safety Notice
DescriptionCct Ref Parts Number DescriptionCct Ref Parts Number
COMMON PARTS
EXPLODED VIEWSPEAKER 1 BLS42240-8TUNER 2 ENV57K01G3FREMOTE CONTROL 3 EUR7628010PANASONIC BADGE 4 TBM0E0101POWER BUTTON 5 TBX0E80800CRT FIXING SCREW 6 THT1062REAR AV COVER 7 TKP0E10801-1DOOR LID 8 TKP0E12002CHASSIS FRAME 9 TMX0E402-3AC CORD ASSY 10 TXASX01CTMGFOCUS LEAD ASSY 11 TXJ/FC0DCNG
1. RESISTORAll resistors are carbon ¼W resistor, unless markUnit of resistance is OHM (Ω) (k=1,000, M=1,000
2. CAPACITORSAll capacitors are ceramic 50V unless marked otUnit of capacitance is µF unless otherwise stated
3. COILUnit of inductance is µH, unless otherwise stated
4. TEST POINTTest Point Position
5. EARTH SYMBOL
Chassis Earth (Cold)
Line Earth (Hot)
6. VOLTAGE MEASUREMENTVoltage is measured by a d.c. voltmeter.Measurement conditions are as follows:Power source a.c. 220V-240V, 50HzReceiving Signal Colour Bar signal (RF)All customer controls Maximum position
7.
Indicates the Video signal path
Indicates the Audio signal path
These schematic diagrams are the latest at time of pr
REMARKS
a. Do not touch the hot part, or the hot and cold par
b. Do not short circuit the hot and cold circuits as elc. Do not connect an instrument, such as an oscillo
fuse failure. Connect the earth of the instrumentsd. Make sure to disconnect the power plug before r
NOTE
1. The Power Supply Circuit contains a circuit area, The circuit is defined by HOT and COLD indicatioCOLD.
IMPORT NT SAFETY NOTICEComponents identified by mark have special characteristicsimportant for safety. Wheonly manufacturers' speci
A
ed otherwise.,000)
herwise..
.
inting and are subject to change without notice.
ts at the same time, as you are liable to a shock hazard.
ectrical components may be damaged.scope, to the hot and cold circuits simultaneously as this may cause to the earth connection of the circuit being measured.emoving the chassis.
which uses a separate power supply to isolate the earth connection. ns in the schematic diagram. All circuits, except the Power Circuit, are
n replacing any of these components, usefied parts.