Panasonic CT-34WDM60 Service Manual ▷ View online
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Contents
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Cover
Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Self-Check Function. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Chassis Board Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Location of Lead Wiring 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Location of Lead Wiring 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Service Hints. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Service Adjustment Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
IIC Mode Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Adjustment Method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Conductor Views . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Block Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .58
Schematic Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .62
Parts Location & Mechanical Replacement Parts List . . . . . . . . . . . . . . . . . .74
Replacement Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .76
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SAFETY PRECAUTIONS
General Guidelines
1.
It is advisable to insert an isolation transformer in the AC
power line before servicing a hot chassis.
power line before servicing a hot chassis.
2.
When servicing, observe the original lead dress, espe-
cially the lead dress in the high voltage circuits. If a
short circuit is found, replace all parts which have been
overheated or damaged by the short circuit.
cially the lead dress in the high voltage circuits. If a
short circuit is found, replace all parts which have been
overheated or damaged by the short circuit.
3.
After servicing, see to it that all the protective devices
such as insulation barriers, insulation papers, shields,
and isolation R-C combinations, are properly installed.
such as insulation barriers, insulation papers, shields,
and isolation R-C combinations, are properly installed.
4.
Before switching the power on, measure the resistance
between B+ line and cold side chassis ground. Connect
the “-” side of an ohmmeter to the B+ line, and the “+”
side to chassis ground. Each line must have more resis-
tance value than the specified one as follows:
between B+ line and cold side chassis ground. Connect
the “-” side of an ohmmeter to the B+ line, and the “+”
side to chassis ground. Each line must have more resis-
tance value than the specified one as follows:
5.
When the set is not used for a long period of time,
unplug the AC power cord plug from the AC line outlet.
unplug the AC power cord plug from the AC line outlet.
6.
High voltage points, as high as 36 ± 0.2 kV, are present
when the set is in operation. Operating the set without
the rear cover involves in a dangerous electrical shock
from the set power supply. Servicing must not be
attempted by anyone who is not thoroughly familiar with
the necessary precautions when working on high volt-
age equipment. Always discharge the anode of the pic-
ture tube to chassis ground before handling the picture
tube.
when the set is in operation. Operating the set without
the rear cover involves in a dangerous electrical shock
from the set power supply. Servicing must not be
attempted by anyone who is not thoroughly familiar with
the necessary precautions when working on high volt-
age equipment. Always discharge the anode of the pic-
ture tube to chassis ground before handling the picture
tube.
7.
After servicing, make the following leakage current
checks to prevent the customer from dangerous electri-
cal shock.
checks to prevent the customer from dangerous electri-
cal shock.
Leakage Current Cold Check
1.
Unplug the AC power cord and short between the two
prongs of the AC plug with a jumper wire.
prongs of the AC plug with a jumper wire.
2.
Set the power switch of this set to ON position.
3.
Measure the resistance value with an ohmmeter
between the shorted AC plug and each exposed metallic
part of the set cabinet such as screwheads, connectors,
and control shafts. When the exposed metallic part has
a return path to the chassis, the reading should be more
than 1 M
between the shorted AC plug and each exposed metallic
part of the set cabinet such as screwheads, connectors,
and control shafts. When the exposed metallic part has
a return path to the chassis, the reading should be more
than 1 M
Ω
.
When the exposed metal part does not have a return
path to the chassis, the reading must be infinity.
path to the chassis, the reading must be infinity.
B+ line
Minimum Resistance
208V(TPD43)
10k
Ω
130V(TPD53, TPD55)
10k
Ω
23V(TPD57,58)
3k
Ω
15V(TPD60)
5k
Ω
6V(TPD43,45)
50k
Ω
Leakage Current Hot Check (See Fig.1)
1.
Plug the AC power cord directly into the AC line outlet.
Do not use an isolation transformer for this check.
Do not use an isolation transformer for this check.
2.
Connect a 1.5k
Ω
, 10W resistor, in parallel with a 0.15µF
capacitor between each exposed metallic part of the set
and an earth ground such as a water pipe.
and an earth ground such as a water pipe.
3.
Use a high impedance AC voltage meter to measure the
voltage across the resistor.
voltage across the resistor.
4.
Measure the voltage at each exposed metallic part.
5.
Reverse the AC plug inserting direction at the AC line
outlet and repeat each of the above measurements.
outlet and repeat each of the above measurements.
6.
The voltage at any point must be less than 0.75Vrms.
7.
A leakage current tester (Symptom Model 229 or the
equivalent) may be used to make the hot checks. In this
case, the current must be less than 500µA.
equivalent) may be used to make the hot checks. In this
case, the current must be less than 500µA.
8.
If the reading is more than the above value, the set must
be repaired and rechecked before it is returned to the
customer because of a possibility of an electrical shock.
be repaired and rechecked before it is returned to the
customer because of a possibility of an electrical shock.
X-Radiation
WARNING:
1.
The potential sources of X-Radiation in the monitor set
are the high voltage section and picture tube.
are the high voltage section and picture tube.
2.
When using a picture tube test jig for service, make sure
that jig is capable of handling 32.5kV without causing X-
Radiation.
that jig is capable of handling 32.5kV without causing X-
Radiation.
3.
For continued X-radiation protection, in case that at least
one of the components listed below is replaced, follow
the adjustment procedure of the high voltage circuit.
Precise adjustment is necessary for R581 to protect X-
Radiation. Refer to “High Voltage and X-Radiation Pro-
tective Circuit Adjustment section”.
one of the components listed below is replaced, follow
the adjustment procedure of the high voltage circuit.
Precise adjustment is necessary for R581 to protect X-
Radiation. Refer to “High Voltage and X-Radiation Pro-
tective Circuit Adjustment section”.
T551, IC402, IC1009, D409, D404, D510, R513, R514,
R515, R581, R411, R418, R423, R431, R849, R850,
R105, R1099, C408, C410, C555, C850, RL801
R515, R581, R411, R418, R423, R431, R849, R850,
R105, R1099, C408, C410, C555, C850, RL801
Hot-Check Circuit
Fig. 1
AC Voltmeter
To
Instrument’s
Exposed
Metallic Parts
Instrument’s
Exposed
Metallic Parts
1.5k
, 10W
0.15
µ
F
Water Pipe
( Earth )
( Earth )
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HOLD DOWN OR SAFETY CIRCUIT
INFORMATION
INFORMATION
To monitor the high voltage, the positive DC voltage from the
cathode D510 is applied through R595 and other resistors to
pin 6 of IC402, which is the input terminal of the X-ray Pro-
tection Circuit. The voltage at pin 6 of IC402 is adjusted by
R581 same voltage at pin 5 of IC402 with high voltage is
36kV. Under normal conditions this voltage is insufficient to
activate the X-ray Protection Circuit.
cathode D510 is applied through R595 and other resistors to
pin 6 of IC402, which is the input terminal of the X-ray Pro-
tection Circuit. The voltage at pin 6 of IC402 is adjusted by
R581 same voltage at pin 5 of IC402 with high voltage is
36kV. Under normal conditions this voltage is insufficient to
activate the X-ray Protection Circuit.
If the high voltage increases over the specified voltage, the
voltage at pin 6 of IC402 increases and causes the X-ray
Protection to activate. Then it causes the shut down works.
voltage at pin 6 of IC402 increases and causes the X-ray
Protection to activate. Then it causes the shut down works.
In the process described above, the voltage at pin 6 of IC402
is compared with the voltage at pin 5 of IC402 which is basi-
cally a constant voltage fed from the Zener Diode D404. If
excessive beam current is drawn, the voltage at pin 6 of
IC402 increases. When the voltage at pin 6 of IC402 over the
voltage at pin 5 of IC402, the voltage at pin 7 of IC402
becomes “high” and feeds into Base of Q401, and the volt-
age at Corrector of Q401 becomes “high” and feeds into pin
28 of micro-controller IC1009 through D409 and R1097. The
micro-controller then turns off Q845, causes the AC power
relay RL801 to unlatch and turns off the receiver.
is compared with the voltage at pin 5 of IC402 which is basi-
cally a constant voltage fed from the Zener Diode D404. If
excessive beam current is drawn, the voltage at pin 6 of
IC402 increases. When the voltage at pin 6 of IC402 over the
voltage at pin 5 of IC402, the voltage at pin 7 of IC402
becomes “high” and feeds into Base of Q401, and the volt-
age at Corrector of Q401 becomes “high” and feeds into pin
28 of micro-controller IC1009 through D409 and R1097. The
micro-controller then turns off Q845, causes the AC power
relay RL801 to unlatch and turns off the receiver.
Service Instruction: Procedure to apply
silicone to the seal control R580
silicone to the seal control R580
Purpose
To prevent any adjustment on the sealed control after final
adjustment is done at factory. If the sealant are removed
for any reason, the control is damaged at same time.
adjustment is done at factory. If the sealant are removed
for any reason, the control is damaged at same time.
Material
1. Silicone-Type T8C1710201H, manufactured by Shin-Etsu
Chemical Co., Ltd. (Japan)
2. Hard ABS tube-Type TMMX004
Tools
No tool is required.
Procedures
1. Place the hard ABS tube on the designated sealed con-
trol,
trol,
as shown in Figure a.
Figure a.
2. When the tube is gently pressed all the way down and
adhere to the P.C.B., apply the silicon into the hard ABS
tube and form hemisphere like object on the top of tube, a
tube and form hemisphere like object on the top of tube, a
shown in Figure b.
Figure b.
5
6
1
+
-
+
-
X-Ray Detect
28
7
7
5
6
12V
R849
Q845
R850
C850
R1050
IC1009
R1097
D409
R411 Q401
R418
R423
R431
C408 C410
R420
R515
R581
R630
R514
R513
FBT T551
D510
C555
D404
5V
9V
EHT
CRT
IC402
AC POWER RELAY
RL801
Comparator Ref.
Comparator out
Comparator in
Silicone
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Self-check Function
When symptoms like "the power fails sometimes" or "sometimes there is no picture and/or sound" can not be confirmed at the
time of servicing, the self-check function can be used to confirm the occurrence and to find the defective circuit.
In case of "power failure", flashing of the "VIDEO IN" indication (red) at the front of the unit can be used to narrow down the +B
line.
time of servicing, the self-check function can be used to confirm the occurrence and to find the defective circuit.
In case of "power failure", flashing of the "VIDEO IN" indication (red) at the front of the unit can be used to narrow down the +B
line.
Self-check of the microcomputer control system (bus line)
Indication method
Screen display
<Indication method>
Input a 1080i signal or NTSC Sig-
nal, press the SLEEP button on
the remove control
simultaneously with the
"VOLUME -" button on the unit.
(The display will be switched to
the screen of VIDEO 1 and the
screen shown on the right will be
displayed.)
Input a 1080i signal or NTSC Sig-
nal, press the SLEEP button on
the remove control
simultaneously with the
"VOLUME -" button on the unit.
(The display will be switched to
the screen of VIDEO 1 and the
screen shown on the right will be
displayed.)
<Return to the normal screen>
Return to the normal screen will
be made by POWER or any other
remote control operation.
Return to the normal screen will
be made by POWER or any other
remote control operation.
ASPECT INPUT
VOLUME
[ VOLUME ] Button
[SLEEP]
Button
Button
POWER GAME INPUT
RECALL
MUTE
SLEEP
POWER SAVE
VOL
ASPECT
SELF ASPECT
CT-34WDM60
OK H49
HM IC8618
IIC/1
IIC/2
Check result of IC
"OK"
Normal
"NG"
Abnormal
(Check IC or its nearby components)
(Check IC or its nearby components)
OK H30
J/IC4001
OK H32
/IC4007
OK H14
A/IC3061
OK H94
DP/IC5607
OK H92
GY/IC5203
OK H38
X/IC2601
OK H21
Z/IC2401
OK H50
F/IC402
OK H44
IC5706
OK H93
IC5205
OK H34
IC2701
OK H51
IC604
OK H45
IC5712
OK H36
IC5204
OK H46
IC5208
OK H37
IC2702
OK H52
IC610
OK H39
IC4002
OK H33
IC4008
OK H90
IC3071
OK H31
IC4003
ID
Display Contents
Indication
No.
Symptom, status
Treatment method
Applicable Board,
applicable Module
H14
BBE and LED does not work.
Exchange IC3061.
A-Board
H90
Picture and/or sound can not be adjusted.
Exchange IC3071.
H21
No sound
Exchange IC2401
Z-Board
H30
Video input is not possible.
Module exchange
J-Module
H31
Video input is not possible.
H32
No sound and No picture
H33
No video from component (color difference) input
H39
Sound switching is not possible.
H34
No video, defective OSD
Module exchange
X-Module
H37
Defective OSD
H38
No video, defective OSD
H36
The NTSC signal is displayed, but the 1080i signal is not
displayed.
displayed.
Module exchange
DP-Module
H44
H45
H94
H46
No NTSC video
Module exchange
GY-Module
H92
H93
H49
Synchronization not possible
Module exchange
HM-Module
H50
Horizontal and vertical synchronization not stationary
Exchange IC402.
F-Board
H51
Earth magnetism compensation does not operate.
Exchange IC604.
H52
The servicing item "distortion correction" does not operate.
Exchange IC610.
!"#$