Order No. MTV0601438CE
Colour Television
CT-F2136LP
GP41 Chassis
Specification
Power Source |
AC SINGLE 220 V, 50/60 Hz |
Y |
1.0 Vp-p, 75Ω |
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Power Consumption |
67 W |
PB |
0.7 Vp-p, 75Ω |
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Standby condition : 2 W |
PR |
0.7 Vp-p, 75Ω |
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Aerial Terminal |
Impedance : 75Ω , Coaxial type |
AV 1, 2, 3 |
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Tuning System |
Frequency Synthesizer |
Video in |
1.0 Vp-p, 75Ω |
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Auto Search Tuning |
Audio in |
Approx. 0.5V, 47KΩ |
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Pos : 100 Positions |
Audio Amp |
AUDIO L-R 0.5VRMS |
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Receiving System |
MTS STEREO |
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(PHONE JACK TYPE x 2) |
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Receiving Channels |
Regular TV |
High Voltage |
27.5 ±1.5 at zero |
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VHF BAND |
2-13 (NTSC M U.S.A) |
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beam current |
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UHF BAND |
14-69 (NTSC M U.S.A.) |
Picture Tube |
A51LYZ295X Type 21 (500 mm) |
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CATV |
1-125 (U.S.A. CATV) |
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Measured diagonally, |
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Intermediate Frequency |
38.0 MHz |
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104° deflection |
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Video |
31.5 MHz (D, K) / 32.5 MHz (B, G) |
Audio Output |
16 W speaker |
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32.0 MHz (I) / 32.5 MHz (M) |
Dimensions (W x D x H) |
648 mm x 488 mm x 473 mm |
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Sound |
33.57 MHz (PAL) / |
Weight (Mass) |
27 kg (Net) |
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Colour |
33.6 MHz (SECAM) |
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34.42 MHz (NTSC) / |
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33.75 MHz (SECAM) |
Note: |
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Video/Audio/Terminals |
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Specifications are subject to change without notice. Mass and |
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dimensions shown are approximate. |
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© 2006 Matsushita Electric Industrial Co., Ltd. All rights reserved. Unauthorized copying and distribution is a violation of law.
CT-F2136LP
CONTENTS
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1 |
Safety Precautions |
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4.1. Adjustment Procedure |
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1.1. General Guide |
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4.2. COLOUR PURITY |
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1.2. Leakage Current Cold Check |
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4.3. CONVERGENCE |
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1.3. Leakage Current Hot Check (See Fig. 1) |
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4.4. WHITE BALANCE (MARKET MODE CHK 4) |
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1.4. X-Radiation |
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4.5. ADJUSTMENT OF CRT VRS |
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1.5. GP41 Block Diagram |
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Conductor Views |
11 |
2 |
Service Hints |
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Schematic Diagrams |
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2.1. HOW TO MOVE CHASSIS INTO SERVICE POSITION. |
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6.1. SCHEMATIC DIAGRAM FOR GP41 CHASSIS |
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Market Mode Function |
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6.2. A Board |
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3.1. Service Mode Access |
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6.3. L Board |
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3.2. Service Mode 1 Controls |
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Parts Locations |
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3.3. Service Mode 1 Function |
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8 |
Replacement Parts List |
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3.4. Service Mode 2 Controls (OPTION data 1 ~ 3) |
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8.1. Replacement Parts List Notes |
23 |
4 |
Adjustment Procedure |
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8.2. Replacement Parts List |
24 |
2
1 Safety Precautions
1.1.General Guide
1.It is advisable to insert an isolation transformer in the AC supply before servicing a hot chassis. Fig. 1.
Fig. 1
2.When servicing, observe the original lead dress, especially 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, observe 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 outlet.
5.Potential, as high as 29kV kV is present when this receiver is in operation. Operation of the receiver without 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. Fig. 2.
Fig. 2
2.Turn on the receiver’s power switch.
3.Measure the resistance value, with an ohmmeter, between the jumpered 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 MΩ and 20 MΩ . When the exposed metal does not have a return path to the chassis, the reading must be zero.
CT-F2136LP
1.3.Leakage Current Hot Check (See Fig. 1)
1.Plug the AC cord directly into the AC outlet. Do not use an isolation transformer for this check.
2.Connect a 2 kΩ , 10 W resistor in series with an exposed metallic part on the receiver and an earth such as a water pipe.
3.Use an AC voltmeter, with high impedance type, to measure the potential across the resistor.
4.Check each exposed metallic part, and measure the voltage at each point. Fig. 3.
Fig. 3
5.Reverse the AC plug in the AC outlet and repeat each of the above measurements.
6.The potential any point should not exceed 1.0 V rms. In the case of a measurement being outside of the limits specified, there is a possibility of a shock hazard, and the receiver should be repaired and re-checked before it is returned to the customer. Fig. 4.
Fig. 4
1.4.X-Radiation
Warning :
1.The potential sources of X-Radiation in TV sets are the EHT section and the picture tube.
2.When using a picture tube test rig for service, ensure that the rig is capable of handling 29 kV without causing X- Radiation.
Note: It is important to use an accurate periodically calibrated high voltage meter.
1.Set the brightness to minimum.
2.Measure the High Voltage. The meter reading should indicate 27.5 ± 1.5V. If the meter indication is out of tolerance, immediate service and correction is required to prevent the possibility of premature component failure.
3.To prevent the possibility of X-Radiation, it is essential to use the specified picture tube.
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4
G
MAIN
POWER
SWITCH
FRONT INPUTS
AV2 : V/L/R
GEOMAGNETIC
WOOFER
AMP
IC2401
GP41 CHASSIS BLOCK DIAGRAM
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SCL |
EEPROM |
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PVP |
SDA |
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SPEAKER |
IC1101 |
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IC1801 |
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CVBS IN |
R/G/B |
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A |
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AUDIO |
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L |
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AMP |
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CVBS OUT |
R/G/B |
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SCL SDA |
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IC2301 |
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AUDIO |
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OUT |
VCT-IF |
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R |
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CRT |
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defl. |
CRT |
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REAR INPUTS |
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G |
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DRIVE |
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coil |
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AV1 : V/L/R |
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V_IN |
IC601 |
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B |
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AV3 : YUV/V/L/R |
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A_IN |
IF |
H |
V |
VM |
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MON_OUT |
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FRONT INPUTS |
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AV2 : V/L/R |
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V OUT |
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MON_OUT |
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TUNER |
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V/L/R |
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H OUT |
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29" models PIP models
Diagram Block GP41 .5.1
F2136LP-CT
CT-F2136LP
2 Service Hints
2.1.HOW TO MOVE CHASSIS INTO SERVICE POSITION.
1. Remove 9 screws.
2. Draw out Main Chassis.
3. Stand the Main Chassis.
5
CT-F2136LP
3 Market Mode Function
3.1. Service Mode Access
1. Set timer ON.
2. Press remote’s RECALL ( 
) and panel’s volume down key simultaneously to enter SERVICE 1.
3. Set to normal mode : Press the volume down button on front, together press the off timer button on remote control.
3.2. Service Mode 1 Controls
1.Key 3 / 4
previous / next service 1 item
2.Key 8 / 9
adjust user brightness (-/+)
3.Program up / down program position up / down
4.Volume +
increment of selected item
5.Volume -
decrement of selected item
6.OK (remote)
store / save selected item
7.Normal (remote) exit service mode
3.3.Service Mode 1 Function
1. H-POS |
11. ANGEL |
-128~127 |
-128~127 |
2. V-POS |
12. BOW |
-128~127 |
-128~127 |
3. H-AMP |
13. DVCO |
-128~127 |
-128~127 |
4. V-AMP |
14. H-POS |
-128~127 |
-128~127 |
5. EW-AMP1 |
15. G-CUT OFF |
-128~127 |
N / A |
6. LOW_Corner |
16. B-CUT OFF |
-128~127 |
0~511 |
7. TRAPEZ 1 |
17. R-DRIVE |
-128~127 |
0~511 |
8. UPPER_Corner |
18. G-DRIVE |
-128~127 |
0~511 |
9. V-LIN |
19. B-DRIVE |
-128~127 |
0~511 |
10. V-SYM |
20. SUB-Bright |
-128~127 |
-128~127 |
3.4.Service Mode 2 Controls (OPTION data 1 ~ 3)
1. Key 3 / 4 |
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previous / next service 2 item |
5. Volume - |
2. Key 8 / 9 |
decrement of selected item |
toggle for options bit 0 - 7 |
6. OK (remote) |
3. Program up / down |
store / save selected item |
program position up / down |
7. Normal (remote) |
4. Volume + |
exit service mode |
increment of selected item |
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NOTE: Service mode 2 options bit refer to each model spec. |
6
4 Adjustment Procedure
4.1.Adjustment Procedure
4.1.1.+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 :
TPD 15 : 3.35 ± 0.2V TPD 16 : 141 ± 2V TPD 17 : 8.2 ± 0.5V TPD 18 : 1.9 ± 0.2V TPD 19 : 5.2 ± 0.2V TPD 20 : 175 ± 15V
4.1.2.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 D866 and confirm the +B voltage is 141.0 ± 2V.
2.Connect a high frequency voltmeter to heater and confirm that voltage reads 6.30 ± 0.24 (VRMS).
3.Normalize the brightness and contrast.
4.2.COLOUR PURITY
1.Set Bright and Contrast controls to their maximum positions.
2.Operate the TV set over 60 minutes.
3.Full degauss the picture tube by using an external degaussing coil. By rotating R-B static convergence magnet.
4.Apply a crosshatch pattern signal and adjust roughly the static convergence magnets.
5.Apply a green pattern signal.
6.Loosen a clamp screw for the Deflection Yoke and move the Deflection Yoke as close to the purity magnet as possible.
7.Adjust the purity magnet so that a vertical green field is obtained at the center of the screen.
CT-F2136LP
4.1.3.NTSC TINT COLOUR
Item / preparation
1.Connect oscilloscope probe to TPL1 (R OUT) with 10kΩ series resistor.
2.Press Main Menu and set system to use AV-NTSC (3.58 MHz).
DYNAMIC ................... Normal
Channel CLR Set ..... |
STD |
Adjustment procedure
1.Adjust Sub-Tint so that No. 2, 3 and 4 becomes level waveform is similar to Fig. 3.
2.Confirm phase at Tint is changes more than ± 15 by Tint control.
3.Confirm that colour level is maximum when colour DAC is adjusted to maximum position.
Note: Use remote control only when adjusting user mode to Sub-Tint.
8.Slowly press the Deflection Yoke and set it where a uniform green field is obtained.
9.Adjust roughly the Low Light controls and make sure that a uniform white field is obtained.
10.Tighten the clamp screw.
7
CT-F2136LP
4.3.CONVERGENCE
1.Apply a crosshatch pattern signal and set Contrast control to the maximum position.
2.Adjust Bright control to obtain a clear pattern.
3.Adjust Red and Blue line at center of the screen.
4.Adjust Red and Blue with Green line at center of the screen by rotating (RB)-G static convergence magnet.
5.Lock convergence magnets with silicone sealer.
6.Remove the DY wedges and slightly tilt the Deflection Yoke vertically.
7.Fix the Deflection Yoke by re-inserting the DY wedges.
8.If purity error is found, repeat “Colour Purity” adjustment.
8
CT-F2136LP
4.4.WHITE BALANCE (MARKET MODE CHK 4)
Preparation
1.Receive a colour bar signal with colour “OFF”, and operate the TV set for more than 30 minutes.
2.Set the picture menu to “DYNAMIC NORMAL” and the AI to off.
3.Connect an oscilloscope to KG on L BOARD.
4.Set the TV set to Market Mode : white balance adjustment (CHK 4).
5.Screen VR : Min.
6.Set the data level of RGB CUT OFF / DRIVE and SUB BRIGHT.
Adjustment
1.Select G-CUTOFF adjustment mode and collapse vertical scan.
2.Adjust G-CUTOFF control to become the DC=0 V to video level at 150 V as shown in Fig. 1.
8.Wedge A shown in Fig. 2 should be fixed within a range of 45° to the left of the vertical line as shown.
9.After inserting wedge A, insert wedges B, C and D. The wedges should be set 90° apart from each other.
10.Be certain that the four 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.
Fig. 1
3.Slowly turn the screen control clockwise until a green colour horizontal line appears on the picture tube. This is the setting point for the screen control.
Note:
Do not adjust the G-CUTOFF setting in the following procedure.
4.Adjust the remaining R and B-CUTOFF controls so as to get a white horizontal line on the screen.
5.Return to full field SCAN by pushing the position 5 key on the remote control.
6.Adjust the R-Drive and B-Drive controls as to obtain a uniform white on the white bar of the greyscale pattern.
7.Confirm correct B/W rendition and greyscale tracking or repeat CUTOFF and drive control setup.
Note:
Write down the original value for each address adjustment before adjusting anything.
9
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