1. It is advisable to insert an isolation transformer in the AC supply before servicing this hot chassis.
2. When servicing, observe the original lead dress, especia lly 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.
4. When the receiver is not to be used for a long period of time, unplug the power cord from the AC cord outlet.
5. Potential, as high as
involves the danger of a shock hazard from the receiver power supply. Servicing should not be attempted by anyone who is not
thoroughly familiar with the precautions necessary when working on high voltage equipment. Always discharge the anode of the
picture tube to the receiver chassis before handling the tube. After servicing make the following leakage current checks to
prevent the customer from being exposed to shock hazards.
1.2. Leakage Current Cold Check
1. Unplug the AC cord and connect a jumper between the two prongs on the plug.
2. Turn on the receiver’s power switch.
Measure the resistance value, with an ohmmeter, between the jumper AC plug and each exposed metallic cabinet part on the
receiver, such as screw heads, aerials, connectors, control shafts, etc. When the exposed metallic part has a return path to the
chassis, the reading should be between 4 MΩand 20 MΩ. When the exposed metal does not have a return path to the chassis,
the reading must be infinite.
29.0kV
is present when this receiver is in operation. Operation of the receiver without the rear cover
1.3. Leakage Current Hot Check (Fig. 1)
1. Plug the AC cord directly into the AC outlet. Do not use an isolation transformer for this check.
2. Check a 2 kΩnon-inductive resistor and an AC/DC current meter, in series with each exposed metallic part on the receiver in
turn and an earth such as a water pipe.
The current from any point should not exceed 0.7 mA peak AC or 2 mA DC. In the case of a measurement being outside of
these limits specified, there is a possibility of a shock hazard and the receiver should be repaired and rechecked before it is
returned to the customer.
Fig. 1
1.4. X-Radiation
Warning:
The potential sources of X-Radiation in TV set are the EHT section and the picture tube. When using a picture tube test jig for
service, ensure that jig is capable of handling
Note:
It is important to use an accurate periodically calibrated high voltage meter.
1. Set the brightness to minimum.
2. Use the remocon to get into Service Mode.
3. Measure the EHT. The meter reading should indicate
and correction is required to prevent the possibility of premature component failure.
4. To prevent the possibility X-Radiation, it is essential to use the specified picture tube, if service replacement becomes
necessary.
29.0kV
without causing X-Radiation.
27.5±1.5kV
. If the meter indication is out of tolerance, immediate service
3
Page 4
_
_
TC-21FX20P
1.5. GP41 Chassis Block Diagram
CRT
coil
defl.
29" models
CRT
DRIVE
L
VM DRIVE
PIP models
IC1101
EEPROM
RGB
SCL SDA
SCL
SDA
R/G/B
PVP
IN
IC1801
CVBS
GP41 CHASSIS BLOCK DIAGRAM
PP
SPEAKER
R/G/B
CVBS OUT
AMP
AUDIO
A
VCT-IF
OUT
AUDIO
IC2301
REAR INPUTS
VM
V
H
IC601
IF
IN
IN
V
A
MON_OUT
AV1 : V/L/R
AV 3 : YUV/V/L/R
V OUT
TUNER
AV2 : V/L/R
FRONT INPUTS
MON_OUT
H OUT
V/L/R
MAIN
POWER
SWITCH
G
AV2 : V/L/R
FRONT INPUTS
GEOMAGNETIC
AMP
IC2401
WOOFER
4
Page 5
2 Service Hints
2.1. Service Position for E-Board
1. Remove the back cover.
2. Stand the TV set as shown in Fig. 2.
3. Remove the A-Board from the TV set by pulling the main board out as shown in Figure 2.
TC-21FX20P
Fig. 2
2.2. Factory Mode Adjustment
1. Factory Mode Adjustment.
a) Set timer ON
b) Press remote’s RECALL (
2. To Set Self-Check:
Press the volume down button on TV then press the Off Timer Button on remote control.
3. Service Mode 1 Controls
4. Service Mode 1 Function
) and panel’s volume down key simultaneously to enter SERVICE 1.
5. Service Mode 2 Controls
To enter SERVICE 2; press channel key ‘1’ in SERVICE 1 entry screen.
5
Page 6
TC-21FX20P
NOTE :- Service mode 2 options bit.
6. Service Mode 3 Controls
To enter SERVICE 3; press channel key ‘1’ in SERVICE 2 entry screen.
7. Service Mode 3 Function
6
Page 7
2.3. Adjustment for White Balance
Preparation:
1. Receive the white balance pattern and aging should have been performed over 30 minutes.
2. Set the picture menu to DYNAMIC NORMAL.
3. Degausse the CRT face.
4. Fix the CRT colour analyze r receiver unit to CRT face.
Adjustment of Low Light.
1. Adjustment Sub Bright, so that Y = 6.5 ± 1.0 nit.
2. Adjustment R-CUT OFF, so that X = 0.245 ± 0.015 nit.
3. Adjustment G-CUT OFF, so that Y = 0.274 ± 0.015 nit.
Adjustment of High Light
1. Adjustment Sub Bright, so that Y = 150 nit.
2. Adjustment R-Drive, so that X = 0.261 ± 0.015 nit.
3. Adjustment B-Drive, so that Y = 0.267 ± 0.015 nit.
TC-21FX20P
2.4. Adjustment for CRT CUT OFF
Preparation:
1. Connect the oscilloscope probe to TPL5.
2. Screen VR min.
3. Set the data Sub Bright, Bright.
4. In service Mode at “Bright” dac press [5] in factory mode to enter vertical line and adjust by volume down or up button.
5. Adjust “Screen VR” until 1-H Line appears.
7
Page 8
TC-21FX20P
2.5. Adjustment Procedure
2.5.1. +B Voltage
Item / preparation
1. Operate the TV set.
2. Set control as follows :
Brightness ........... minimum
Contrast ............... minimum
Adjustment procedure
1. Confirm the DC voltage at the indicated test points, as follows :
TPA 15 : 3.35 ± 0.2V
TPA 16 : 141 ± 2V
TPA 17 : 8.2 ± 0.5V
TPA 18 : 1.9 ± 0.2V
TPA 19 : 5.2 ± 0.2V
TPA 20 : 175 ± 15V
2.5.2. High Voltage
Item / preparation
1. Receive the crosshatch pattern.
2. Set to 0 Beam.
Screen VR .......... minimum
Contrast .............. minimum
Adjustment procedure
1. Connect a DC voltage meter to TPA 16 and confirm the +B voltage is 141.0 ± 2V.
2. Connect a high frequency voltmeter to heater and confirm that voltage reads 6.3 ± 0.24 (VRMS).
3. Normalize the brightness and contrast.
8
Page 9
2.6. Adjustment
TC-21FX20P
Before Colour Purity, Convergence and White Balance adjustment are attempted,
V. Height, H. Centre and Focus adjustments must be completed.
Colour Purity
1. Set the Brightness and Contrast controls to their maximum
positions.
2. Operate the TV set for 60 minutes.
3. Fully degausse the picture tube by using an external
degaussing coil.
4. Apply a crosshatch pattern signal and adjust the static
convergence magnets to the approximately correct position.
5. Receive a black and white signal.
6. Set the control as follows:
Red................minimum
Green.............minimum
Blue...............minimum
Press the Shipping button on the remote control twice to
select CRT Adjustment Mode to select low light.
7. Loosen the clamp screw for the Deflection Yoke A in Fig. 10
and move the Deflection Yoke as close to the purity magnet
as possible.
8. Adjust the purity magnetic rings so that a vertical green field
is obtained at the centre of the screen.
Convergence
1. Apply a crosshatch pattern signal and Normalize Contrast
control to the maximum position s.
2. Adjust Brightness until the grey position of the crosshatch
pattern just becomes black.
3. Adjust the Red and Blue line at the centre of the screen by
rotating the R-B static.
Fig. 6
9. Slowly push the Deflection Yoke and set it where a uniform
green field is obtained.
Fig. 21
10. Re-adjust the Low Light controls to their correct settings
and make sure that a uniform white field is obtained.
11. Tighten the clamp screw A in Fig. 10.
Fig. 8
4. Adjust Red and Blue with Green line at centre of the screen
by rotating (RB)-G static convergence magnetic rings.
5. Lock convergence magnets with silicone sealer.
6. Remove the DY wedges and slightly tilt the Deflection Yoke
vertically and horizontally to obtain the good overall
convergence.
Fig. 9
7. Fix the Deflection Yoke by reinserting the DY wedges. Refer
to Fig. 10.
8. If purity error is found, repeat “Colour Purity” adjustment.
9
Page 10
TC-21FX20P
Adjustment of CRT VRS
Preparation
1.
a. Set DY to CRT not to tilt up and down left and right deflection.
b. Set CY to CRT and set CY magnet primarily (Fig. 1)
Purity magnet : Set purity magnet that 2 magnets are (TOP POSITION)
VRS magnet : Set purity magnet 2 magnets are (HORIZONTAL POSITION)
Adjustment
2.
a. Receive that Cross Hatch pattern.
b. Adjust V-SHIFT -50Hz.
c. Set 2 magnets of horizontal position to up and down equally so that it will be the center part of CRT. (Fig. 2)
10
Page 11
Fig. 10
TC-21FX20P
Fig. 11
Notes:
1. Wedge A, B and C should be inserted following the sequence of 1, 2 and 3 shown in Fig. 11.
2. The wedges should be set 120° apart from each other.
3. Be certain that three wedges are firmly fixed and the Deflection Yoke is tightly clamped in place.
Otherwise the Deflection Yoke may shift its position and cause a loss of convergence and purity.
11
Page 12
TC-21FX20P
3 Conductor Views
12
Page 13
4 Schematic Diagram
TC-21FX20P
13
Page 14
TC-21FX20P
14
Page 15
4.1. A Board
4.1.1. A Board (1/5)
TC-21FX20P
<1A>
<2A>
<3A>
<4A>
<5A>
<6A>
<7A>
<8A>
15
<9A>
Page 16
TC-21FX20P
4.1.2. A Board (2/5)
<1A>
<2A>
<3A>
<1B>
<2B>
<3B>
<4A>
<5A>
<6A>
<7A>
<8A>
<4B>
<5B>
<6B>
<7B>
<8B>
<9A>
<9B>
16
Page 17
4.1.3. A Board (3/5)
TC-21FX20P
<1B>
<2B>
<3B>
<1C>
<2C>
<4B>
<5B>
<6B>
<7B>
<8B>
<3C>
<4C>
<5C>
<6C>
<7C>
<8C>
<9B>
<9C>
17
Page 18
TC-21FX20P
4.1.4. A Board (4/5)
<1C>
<2C>
<1D>
<2D>
<3D>
<4D>
<3C>
<4C>
<5C>
<6C>
<7C>
<8C>
<5D>
<6D>
<7D>
<8D>
<9C>
<9D>
18
Page 19
4.1.5. A Board (5/5)
TC-21FX20P
<1D>
<2D>
<3D>
<4D>
<5D>
<6D>
<7D>
<8D>
<9D>
19
Page 20
TC-21FX20P
4.2. L Board
4.2.1. L Board (1/3)
<1A>
<2A>
<3A>
<4A>
<5A>
<6A>
<7A>
<8A>
20
<9A>
Page 21
4.2.2. L Board (2/3)
TC-21FX20P
<1A>
<2A>
<3A>
<4A>
<5A>
<6A>
<1B>
<2B>
<3B>
<4B>
<7A>
<8A>
<9A>
<5B>
<6B>
21
Page 22
TC-21FX20P
4.2.3. L Board (3/3)
<1B>
<2B>
<3B>
<4B>
<5B>
<6B>
22
Page 23
5 Parts Locations
TC-21FX20P
23
Page 24
TC-21FX20P
6 Replacement Parts List
24
Page 25
TC-21FX20P
6.1. Replacement Parts List
Ref.
No.
1A51LYZ295XPICTURE TUBE
2L0AA11C00002 SPEAKER
3TBM4G1296MODEL NAME PLATE
4TBM4G3017PANASONIC BADGE
5TBX4G91101POWER BUTTON
C002ECJ1VF1H103Z C 0.01UF, Z, 50V
C003ECJ1VC1H220J C 22PF, J, 50V
C004ECJ1VC1H220J C 22PF, J, 50V
C006F2A1C101A310 E 100UF, 16V
C1001ECJ2FB0J225K C 2.2UF, J, 6.3V
C1103F1J1H103A590 C 0.01UF, J, 50V
C1131F1J1H103A590 C 0.01UF, J, 50V
C1142ECJ1VF1H104Z C 0.1UF, Z, 50V
C2113F2A1H3R3A317 E 3.3UF, 50V
C2117ECJ1VF1H104Z C 0.1UF, Z, 50V
C2129F2A1C102A159 E 1000UF, 16V
C2303F2A1H4R7A317 E 4.7UF, 50V
C2314F2A1E470A270 E 47UF, 25V
C2315ECA1EM471BE 470UF, 25V
C2321F1J1H102A018 E 1000UF, 50V
C2322F1J1H102A018 E 1000UF, 50V
C2325F2A1C470A310 E 47UF, 16V
C2326F2A1C470A310 E 47UF, 16V
C2328F1J1E474A101 C 0.47UF, 25V
C2329F1J1E474A101 C 0.47UF, 25V
C253ECEA1HN2R2UE 2.2UF, 50V
C254F1J1H102A018 E 1000UF, 50V
C257ECEA1HN2R2UE 2.2UF, 50V
C258F1J1H102A018 E 1000UF, 50V
C301ECJ2VB1C104K C 0.1UF, K, 16V
C302ECJ2VB1C104K C 0.1UF, K, 16V
C3023ECJ1VF1C105Z C 1UF, Z, 16V
C3024ECJ1VF1C105Z C 1UF, Z, 16V
C3025ECJ1VF1C105Z C 1UF, Z, 16V
C3027ECJ1VF1C105Z C 1UF, Z, 16V
C303ECJ2VB1C104K C 0.1UF, K, 16V
C3034ECA1AM471BE 470UF, 10V
C305F2A1C4710045 E 470UF, 16V
C306D0GB240JA008 F 24UF,J, 1/16W
C307D0GB240JA008 F 24UF,J, 1/16W
C308D0GB240JA008 F 24UF,J, 1/16W
Part No.Part Name & DescriptionRemarks
EUR7717040RREMOTE CONTROL
K2JZ2B000021 ANTENNA PLUG
TES4G206COIL SPRING
TES4G214SPRING (POWER BUTTON)
TES4G409-1SPRING (DOOR)
THT4G10139SCREW
THT4G1014JSCREW
TMM4G516RUBBER WASHER
TPD4G1171-1CUSHION (TOP)
TPE4G14003LAMI BAG
TPE4G14025SET COVER
TQB4G3996FAN BAG
TSMA011MAGNET
TSN63115-4PURITY MAGNET
TSX4G167L-1AC POWER CORD
No.
C3176ECA1CM101BE 100UF, 16V
C3177ECA1CM101BE 100UF, 16V
C3178ECJ1VC1H561J C 560PF, J, 50V
C3179ECJ1VC1H561J C 560PF, J, 50V
C3184ECJ1VF1C105Z C 1UF, Z, 16V
C3185ECJ1VF1C105Z C 1UF, Z, 16V
C350ECA1CM101BE 100UF, 16V
C360ECKW3D102KBP C 1000PF, K, 2KV
C363F2A1C4710045 E 470UF, 16V
C366F2A1C101A310 E 100UF, 16V
C368ECA2EM100BE 10UF, 250V
C370F1J1H272A021 C 2700PF, 50V
C371F1J1H272A021 C 2700PF, 50V
C372F1J1H272A021 C 2700PF, 50V
C373ECJ1VC1H471J C 470PF, J, 50V
C374ECJ1VC1H471J C 470PF, J, 50V
C376ECJ1VC1H471J C 470PF, J, 50V
C401ECJ1VC1H560J C 56PF, J, 50V
C404ECQB1333JFP 0.033UF, J, 100V
C406F2A1H221A247 E 220UF, 50V
C407ECJ1VC1H560J C 56PF, J, 50V
C408ECQB1154JFP 0.15UF, J, 100V
C454ECQV1H154JMP 0.15UF, J, 50V
C502ECKR3A821KBP C 820PF, K, 1KV
C504F1J1H681A590 C 680PF, 50V
C507ECJ1VF1C105Z C 1UF, Z, 16V
C511ECA1VM101BE 100UF, 35V
C514F2A1E102A225 E 1000UF, 25V
C516F2A1E102A225 E 1000UF, 25V
C519F2A2C1010015 E 100UF, 160V
C520F2A0J221A317 E 220UF, 6.3V
C550ECQM4223JZP 0.022UF, J,400V
C552ECA2EM100BE 10UF, 250V
C554F0C2E184A039 P 0.18UF, 250V
C559F0C3C752A002 P 7500PF, 1.6kV
C560ECQM4393JZP 0.039UF, J,400V
C561ECKW3D271JBR C 270PF, 2kV
C565F0A1H273A039 C 0.027UF, 50V
C567ECQM4473JZP 0.047UF, J,400V
C568F0C3D102A003 P 1000PF, 2kV
C601F1J1H183A021 C 0.018UF, 50V
C602ECJ1VB1H222K C 2200PF, K, 50V
C604F2A1C101A310 E 100UF, 16V
C606ECJ1VF1H104Z C 0.1UF, Z, 50V
C607ECJ1VF1H103Z C 0.01UF, Z, 50V
C611ECJ1VF1H104Z C 0.1UF, Z, 50V
C613ECJ1VF1H104Z C 0.1UF, Z, 50V
C614ECJ1VC1H100C C 10PF, C, 50V
C615ECJ1VC1H100C C 10PF, C, 50V
C616F2A1C101A310 E 100UF, 16V
C618F2A1C101A310 E 100UF, 16V
C619F2A1C101A310 E 100UF, 16V
C620ECJ1VB1H333K C 0.033UF, K, 50V
C622F2A1C101A310 E 100UF, 16V
C623F2A1C101A310 E 100UF, 16V
C626F2A1C101A310 E 100UF, 16V
C627F2A1C101A310 E 100UF, 16V
C628F2A1A471A274 E 470UF, 10V
C630ECJ1VF1H103Z C 0.01UF, Z, 50V
C631ECJ1VB1H333K C 0.033UF, K, 50V
C632F2A1H4R7A317 E 4.7UF, 50V
C633ECJ1VC1H471J C 470PF, J, 50V
C634ECJ1VC1H471J C 470PF, J, 50V
C635F2A1C101A310 E 100UF, 16V
C639ECJ1VF1H104Z C 0.1UF, Z, 50V
C640ECJ1VF1H104Z C 0.1UF, Z, 50V
C642ECJ1VF1H104Z C 0.1UF, Z, 50V
C645ECJ1VF1H104Z C 0.1UF, Z, 50V
C646ECJ1VF1H104Z C 0.1UF, Z, 50V
C650ECA1CM331BE 330UF, 16V
C652ECJ1VF1H104Z C 0.1UF, Z, 50V
C654ECJ1VF1H104Z C 0.1UF, Z, 50V
C655ECJ1VF1H104Z C 0.1UF, Z, 50V
Part No.Part Name & DescriptionRemarks
25
Page 26
TC-21FX20P
Ref.
No.
C656ECJ1VC1H270J C 27PF, J, 50V
C657ECJ1VC1H560J C 56PF, J, 50V
C662F2A0J101A317 E 4.7UF, 50V
C665ECJ1VC1H150J C 15PF, J, 50V
C666ECJ1VC1H150J C 15PF, J, 50V
C667ECJ1VC1H180J C 18PF, J, 50V
C668ECJ1VC1H180J C 18PF, J, 50V
C812F1A2E152A001 C 1500PF
C813ECKCNA472ME7 C 4700PF, M,
C815F1A2E152A001 C 1500PF
C816F0CAF2240003 CAP 250VAC 0.22UF
C817F0CAF2240003 CAP 250VAC 0.22UF
C818F2A1H1R00053 C 0.22UF
C821ECKW3D561KBP C 560PF, K, 2KV
C826F0A1H103A039 C 01UF, 50V
C827ECQB1H473JFP 0.047UF, J, 50V
C830ECQB1H821KFP 820PF, 50V
C840ECKCNA102MB7 C 1000PF, M,
C841ECKW3D151KBR C 150PF, K, 2KV
C842F2A1H1000084 E 10UF, 50V
C843F2A1E102A223 E 1000UF, 25V
C848ECQB1H471JFP 470PF, J, 50V
C849F1B2H471A025 C 470PF, J, 500V
C851F0A1H103A039 C 01UF, 50V
C854ECKWAE472ZED C 4700PF, Z,500V
C855ECKWAE472ZED C 4700PF, Z,500V
C856F2B2G2710010 E 270UF, 400V
C857ECQM4473JZP 0.047UF, J,400V
C858ECQE2A473JFP 0.047UF, J,250V
C859ECKW3D821KBP C 820PF, K, 2KV
C865ECKW3D331JBP C 330PF, J, 2KV
C867F2A2C2210013 E 220UF, 160V
C869F1J1E563A003 C 0.056UF, 25V
C870F2A1C332A260 E 3300UF, 16V
C871F1B2H471A025 C 470PF, 500V
C872F2A1C222A117 E 2200UF, 16V
C873L6Y5P4B122KC 1200PF, K,500V
C875F1J1H332A021 C 3300PF, 50V
C877F2A1C1000079 E 10UF, 16V
C879F2A0J331A260 E 330UF, 6.3V
C882F2A1C101A310 E 100UF, 16V
C884F2A1C102A159 E 1000UF, 16V
C886F2A1H330A342 E 33UF, 50V
C887F2A1C102A159 E 1000UF, 16V
C890ECQB1H104KFP 0.1UF, K, 50V
C891F2A1C101A310 E 100UF, 16V
C893ECA1CM221BE 220UF, 16V
C897F1J1H332A021 C 3300PF, 50V
C898ECJ1VF1C105Z C 1UF, Z, 16V
IC1101 TVR4GAS463EEPROM IC
IC2301 C0ZAZ0000164 IC
IC451AN15525AIC
IC601TVR4G20-6FLASH MEMORY IC
IC605C0ZAZ0000162 IC
IC801C5HABZZ00116 IC, HYBRID
IC802C0EAS0000026 IC
IC851C0DAEJG00001 IC, POWER SUPPLY
IC857C0DBEHE00005 IC, POWER SUPPLY
IC860B3PAA0000363 PHOTO COUPLER
IC871C0DAEJG00001 IC, POWER SUPPLY
IC875C0DBEHE00005 IC, POWER SUPPLY