Panasonic CT-24SX11E Schematic

ORDER NO. MTNC010837A1 B5

Service Manual

Color Television

Simplified Manual

(NA8MS)

Panasonic

Models

CT-24SX11E AP367 CT-24SX11UE AP367 CT-24SX11CE AP367

This Simplified Service Manual is issued to add listed models to the Main Service Manual order No. MTNC010527C1 (CT-27SX31E). A set of schematics, unique settings and a complete parts list are included in this Manual. Please file and us e this Simplified Service Ma nual together with Main Serv ice Manual, order No. MTNC010527C1 (CT-27SX31E).

Chassis

“WARNING! This Service Man ual is desig ned for expe rienced repa ir technici ans only and is not designed f or use by t he general p ublic. It does not contain warnings or cautions to advise non-technical individuals of potential dangers in attempting to service a product. Products powered by electricity should be serviced or repaired onl y by experienced professional technicians. Any attempt to service or repair the product or products dealt with in this Service Manual by anyone else cou ld result in serious injury or death.”

The service technician is required to read and follow the “Safety Precautions” and “Important Safety Notice” in the Ma in Ma nual.

and distribution is a violation of law.

Important Safety Notice

Special components are us ed in this television s et which are important for safety. These parts are identified on the schematic diagram by the sy mbol and printed in BOLD TYPE on the replaceme nt part list. It is essenti al that these critical parts are replaced with the manufacturer ’s specified replacement part to prevent X-ray radiation,

shock, fire or other hazards. Do not modify the original design without the manufacturer’s permission.

Safety Precautions

General Guidelines

An Isolation Transformer should always be used during the servicing of a r eceiver whose c hassis is not isolated from AC power line. Use a transformer of adequate power rating a s this protects the techn ician from accidents resulting in personal injury from electrical shocks. It will also protec t the Receiver from being damaged by accide ntal shorting that may occur during servicing. When servicing, observe the original lead dress, especially in the high voltage circuit. Replace all damaged parts (also parts that show signs of overheating.) Always Replace Protective Devices, such as fishpaper, isolation resistors and capacitors, and shields after servicing the Receiver. Use only manufacturer ’s recommended rating for fuses, circu its breakers, etc. High potentials are present when this Receiver is operating. Operation of the Receiver without the rear cover introduces danger for elect rical shock. S ervicing should not be performed by anyone who is not thoroughly familiar with the necessary precautions when servicing high-voltage equipment.

Extreme care should be practiced when Handling the Picture T ube. Rough handling may cause it to implode

due to atmospheric pres sure. (14.7 lbs per sq. in.). D o not nick or scratch the glass or subject it to any undu e pressure. When handling, use safety goggles and heavy gloves for protection. Discharge the picture tube by shorting the anode to chassis ground (not to the cabinet or to other mounting hardware). When discharging connect cold ground (i.e. dag ground lead) to the anode with a well insulated wire or use a grounding probe. Avoid prolonged exposure at close range to unshielded areas of the picture tube to prevent exposure to X-ray radiation. The Test Picture Tube used for servicin g the chassis at the bench should incorporate safety glass and magnetic shieldi ng. The safety glass pro vide shielding for the tube viewing area against X-ray radiation as well as implosion. The m agnetic shield limits the X-ray radiation around the bell of the pict ure tube in addition to the restricting magnetic effects. When using a picture tube test jig for service, ensure that the jig is capable of handling 50kV without causing X-ray radiation. Before returning a serviced rec eiver to the owner, the service technic ian must thoroughly test the unit to ensure that is completely safe to operate. Do not use a

line isolation transformer when testing.

Leakage Current Cold Check

Unplug the AC cord and connect a jumper between the two plug prongs. Measure the resistance between the jumpered AC plug and expose metallic parts such as screwheads, antenna terminals, control shafts, etc. If the exposed

metallic part has a return path to the chassis, the reading should be between 240kΩ and 5.2MΩ. If the exposed metall ic part does not have a re turn path to the chassis, the re adi ng sh oul d be infinite.

Leakage Current Hot Check (Fig. 1)

Plug the AC cord directly into the AC outlet. Do not use an isolation transformer during the check. Connect a 1.5kΩ 10 watt resistor in parallel with a

0.15µF capacitor between an exposed metallic part and ground. Use earth ground, for example a water pipe. Using a DVM with a 1000 ohms/volt sensitivity or higher, measure the AC potential across the resistor. Repeat the procedure and measure the voltage present with all other exposed metallic parts. Verify that any potential does not exceed 0.75 volt RMS. A leakage cu rrent te ster (such a Simp son M odel 229, Sencore Model P R57 or equiv alent) may be used in the above procedure, in which case any current measure must not exceed 0.5 milliamp. If any measurement is out of the specified limits, th ere is a possibility of a shoc k haz ar d and the Receiver mus t be repaired and rechecked before it is returned to the customer.

AC VOLTMETER

COLD WATER PIPE (GROUND)

0.15µF

TO INSTRUMENT’S EXPOSED METAL PARTS

1500Ω,10 W

Figure 1. Hot Check Circuit

X-ray Radiation

WARNING: The potential source of X-ray radiation in the

TV set is in the High Voltage section and th e pictu re tube .

Note: It is important to use an accurate, calibrated

high voltage meter.

Set the brightness, picture, sharpness and color controls to Minimum. Measure the High Voltage. The high voltage should be 30.55 ± 1.25kV. If the upper limit is out of tolerance, immediate service and correction is required to insure safe operation and to prevent the possibility of premature component failure.

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Important Safety Notice . . . . . . . . . . . . . . . . . . 2

Service Notes. . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Board Designation Table . . . . . . . . . . . . . . . . . 4

Receiver Feature Table . . . . . . . . . . . . . . . . . . . 5

Location of Controls (Remote)

EUR511502 . . . . . . . . . . . . . . . . . . . . . . 6

Service Mode (Electronic Controls). . . . . . . . . 7

Exiting the Service Mode . . . . . . . . . . . . 7

Entering Service

Mode (Back-Open Method) . . . . . . . 7

Service Mode Regiters . . . . . . . . . . . . . . 8

Service Adjustments

(Electronic Controls). . . . . . . . . . . . . . . . . 13

Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Schematics, Voltages and waveforms

C-Board Voltages,

PCB & schematics . . . . . . . . . . . . . . . . . 27

A-Board Schematic

(Left Portion) . . . . . . . . . . . . . . . . . . . . . . . . 28

(Right Portion). . . . . . . . . . . . . . . . . . . . . . . 29

A-Board PCB. . . . . . . . . . . . . . . . . . . . . . . . 30

A-Board Voltages . . . . . . . . . . . . . . . . . . . . 31

P-Board schematic . . . . . . . . . . . . . . . . . . . 32

P-Board PCB & voltages. . . . . . . . . . . . . . . 33

A-Board Waveforms . . . . . . . . . . . . . . . . . . 34

Tint/Color Adjustment. . . . . . . . . . . . . . 13

Color Temperature Adjustment . . . . . . 13

Chassis adjustment procedure . . . . . . . . . . . 15

Rear View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

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Service Notes (Continued)

IMPORTANT: To protect against possible damage to

the solid state devices due to arcing or static discharge, make certain that al l ground wires and CTR DAG wire are securely connected.

WARNING: This Receiver has been designed to meet or exceed applicable safety and X-ray radiation protection as specified by government agencies and independent testing laboratories.

CAUTION: The power supply circuit is above earth ground and the chassis cannot be polarized. Use an isolation transformer when servicing the Receiver to avoid damage to the test equipment or to the chassis. Connect the test equipment to the proper groun ( ) or

( ) when servicing, or incorrect voltages will be measured.

Board Table Description

BOARD PART NUMBER BOARD DESCRIPTION

A-BOARD TNP2AH025CA Main board

To maintain original product safety design standards relative to X-ray radiation and shock and fire hazard,

parts indicated with the s ymbol on the schematic must be replaced with identical parts. Order parts from

the manufacturer’s parts center using the parts numbers shown in this servic e manual, or provide the chassis number and the part reference number.

For optimum performance and reliability, all other parts should be replaced with components of identicalspecification.

C-BOARD TNP2AA068AF CRT panel P-BOARD TNP2AH025CA Power Supply Board

* Note: When ordering a replacement board assembly,

append an “S” to the board number.

Example: To order the A-Board, the replacement board is

TNP2AH025CAS.

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Receiver Feature Table

FEATURE/MODEL CT-24SX11E/CE/UE

Chassis AP367 Tuning system 96K # of channels 181 Menu language Eng/Span/Fr Closed Caption X V-Chip X 75 Ω input X Remote Model # EUR511502 Picture tube A60LUQ085X PureFlat Picture Tube X Comb Filter 3 Line Digital V. Edge Correction X V/A norm Both Color Te mp. X MTS/SAP/DBX X Bass/Treble/Balance X Surround Sound X AI Sound X Spatializer/BBE BBE FAO & VAO X Built-in audio power 7Wx2 (10%) # of speakers 2 A/V in (rear/front) 3(2/1) Component Input 1(1/0) S-VHS Input (rear/front) 1/1 Headphone Jack X Dimensions mm

(WxDxH) in Weight (kg/lbs) 35/77.16 Power source (V/Hz) 120/60 Anode voltage 30.55kV ± 1.25kV Video input jack Audio input jack 500mV RMS 47kΩ

550x479x491.5

21.7 x 18.9 x 19.4

75Ω, phono jack

p-p

Table 1. Receiver Features

Specifications are subject to change without notice or obligation. Dimensions and weights are approximate.

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Location of Controls (Remote)

POWER Button

Press to turn ON and OFF.

MUTE Button

Press to mute sound.

A second press resumes sound.

Press also to access and delete

Closed Caption display.

VCR, DVD, LD/CD, AUX, TV, CBL,

DBS, RCVR

Component function buttons

VOL (volume) Buttons

Press to adjust TV sound level.

Use with Channel buttons to

navigate in menus.

R-TUNE (Rapid Tune) Button.

Press to switch to the previous

channel.

ACTION Button

Press to display Main Menu and

access or exit On Screen features

and Adjustment Menus.

REW, PLAY, FF, TV/VCR, STOP,

PAUSE, REC, VCR CHANNEL

Component function buttons.

TV/VIDEO Button

Press to select TV or Video input.

CH (channel) Buttons

Press to select channel s .

Use with volume buttons to

navigate in menus.

Figure 2. Location of Controls (Remote).

EUR511502

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Service Mode (Electronic Controls)

This Receiver has electronic technology using the I²C Bus Concept. It performs as a control function and it replaces many mechanical controls. Instead of adjusting mechanical controls individually, many of the control functions are now performed by using “On Screen Display Menu”. (The Service Adjustment Mode.)

Note: It is suggested that the tec hnician reads all the way through and understand the following proced ure for

Entering/Exiting the Service Adjustment Mode; then proceed with the instructions working with the Receiver. When becoming familiar with the procedure, the Flow Chart for Service Mode may be used as a quick guide.

Quick Entry to Service Mode:

At times when minor a djustments need to b e done to the electroni c controls, the meth od of Entering the ser vice Mode without removal of the cabinet back is as follows using the Remote Control:

1. Select SET-UP icon and select CABLE mode.

2. Select TIMER icon and set SLEEP time for 30 Min.

3. Press ACTION button 3 times to exit menus.

4. Tune to the Channel 124.

5. Adjust VOLUME to minimum ( 0) .

6. Press the VOL button (decrease) on Receiver. Red “CHK” appears in upper corner.

To toggle between Aging and Service modes:

While the “CHK” is displayed on the left top corner of the CRT, pressing the Action and the Volume Up buttons on the Receiver si multaneously will toggle between the modes. Red “CHK” for Service and yellow “CHK ” for Aging.

7. Press the Power Button on the Remote Control to select one of the Service Adjustment Modes.

1) B Service VCJ S U B-DATA ADJUSTMENT.

2) C Service VCJ CUT- O F F ADJUSTMENT.

3) D Service GEOMETRY ADJUSTMENT.

4) M Service MTS ADJUSTMENTS.

5) P Service PIP ADJUSTMENT.

6) S Service S OPTION ADJUSTMENTS.

7) X Service COMB FILTER ADJUSTMENT.

8) E Service AUDIO ADJUSTMENTS

9) “CHK” = Normal operation of CHANNEL and VOLUME .

Note: Only the appli c able settings for

32 B 0 2 215 C 0

the Receiver serviced will be available (See

in Fig. 3).

An address Menu appears in the right hand corner of the screen

Figure 3. Service Mode Menu Adjustments.

Exiting the Service Mode:

Press the Action and the Power buttons on the Receiver simultaneously for at least 2 seconds. THE RECEIVER EXITS SERVICE MODE.

The Receiver momentarily shuts off; then comes back on tuned to channel 3 with a preset level of sound. Any programmed channels, channels caption data and some others user defined settings will be erased.

IMPORTANT NOTE: Always Exit the Service Mode Following Adjustments.

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Press the Power Button on the Remote Control to select the Service Adjustment.

For Adjustments:

1.Press Channel Up/Down on the Remote Control to select one of

the available Se rvice Adjustments (a in Fig. 3).

Note: Write Down the original

value set (b in

Fig. 3

) for each address before modifying anything. It is easy to erroneously adjust the wrong item.

2.Press Volume Up/Down on the Remote Control to adjust the level of the selected Service Adjustment (b in Fig. 3).

Sub-Data Adjustment

B00 SUB-COLOR 27 B01 SUB-TINT 40 B02 SUB-BRIGHTNESS 40 B03 SUB-CONTRAST 6 B04 SUB-TINT VIDEO 10 B05 SUB-COLOR VIDEO 22 B06 SUB-TINT COMP 68 B07 SUB-COLOR COMP 28 B08 SUB SHARP TV/VIDEO 10 B09 SUB SHARP S-VHS/COMP 17 B0A SUB-CONTRAST FIXED 15

Cut-Off Adjustment

Default

Level

Default

Level

IMPORTANT NOTE:

Always Exit the S ervice Mode Following Adjustments.

C00 CUT-OFF R 128 C01 CUT-OFF G 128 C02 CUT-OFF B 128 C03 BRIGHTNESS 31 C04 G DRIVE 64 C05 B DRIVE 64 C06 DRIVE C TEMP 8 C07 CONT C TEMP 5 C08 CUTOFF R COMP 100 C09 CUTOFF G COMP 127

C0A CUTOFF B COMP 100

To D Items.

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Press the Power Button on the Remote Control to select the Service Adjustment

For Adjustments:

1.Press Channel Up/Down on the Remote Control to select one of

the available Se rvice Adjustments (a in Fig. 3).

Note: Write Down the original

value set (b in

Fig. 3

) for each address before modifying anything. It is easy to erroneously adjust the wrong item.

2.Press Volume Up/Down on the Remote Control to adjust the level of the selected Service Adjustment (b in Fig. 3).

Geometry Adjustments

D00 H P OSITION 13 D01 V SIZE 37 D02 V S CORRECTION 5 D03 V LIN CORRECTION 8 D04 E/W TRAPEZIUM 9 D05 V AGC 1 D06 V POSITION 0 D07 V CENTERING 100 D08 V CENTERING DAC SW 1 D09 V-BLK START 12 D0A V-BLK STOP 14 D0B EW CORNER 3 D0C EW PARABOLA 13 D0D H WIDTH 26

Default

Level

D0E OSD POSITION 65

Note: Some adjustment modes may not be

available in some formats.

M00 INPUT LEVEL 33 M01 LOW-LEVEL SEPARATION 6 M02 HIGH-LEVEL SEPARATION 25

MTS Adjustment

IMPORTANT NOTE:

Always Exit the Service Mode Following Adjustments.

Default

Level

To P Items.

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Press the Power Button on the Remote Control to select the Service Adjustment

e e e

For Adjustments:

1.Press Channel Up/Down on the Remote Control to select one of

the available Servic e Adjustments (a in Fig.3).

Note: Write Down the original

value set (b in

Fig. 3

) for each address before modifying anything. It is easy to erroneously adjust the wrong item.

PIP Adjustment

P00 PIP COLOR 53 P01 PIP TINT 54 P02 PIP BRIGHTNESS 11 P03 PIP CONTRAST 58 P04 PIP POS V_TOP 26 P05 PIP POS V_BOTTOM 143 P06 PIP POS H_LEFT 10 P07 PIP POS H_RIGHT 101 P08 PIP POS 26

Default

Level

2.Press Volume Up/Down on th Remote Control to adjust th

level of the selected Servic Adjustment (b in Fig. 3).

P09 PIP POS 160 P0A PIP POS 10 P0B PIP POS 116 P0C N/A N/A P0D PIP YDELAY 4

To S Items.

Note: Some adjustment modes may not be

available in some formats.

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Press the Power Button on the Remote Control to select the Service Adjustment

e e e

For Adjustments:

1.Press Channel Up/Down on the Remote Control to select one of

the available Servic e Adjustments (a in Fig.3).

Note: Write Down the original

value set (b in

Fig. 3

) for each address before modifying anything. It is easy to erroneously adjust the wrong item.

2.Press Volume Up/Down on th Remote Control to adjust th level of the selected Servic Adjustment (b in Fig. 3).

OPTIONS Adjustment

S00 ABL GAIN 3 S01 ABL POINT 3 S02 RGB BRIGHTNESS 6 S03 RGB GAMMA 1 S04 GAMMA 1 S05 VSM-G 0 S06 BS POINT 3 S07 CLOCK ADJUST 128 S08 CAP DIGITAL FIL 0 S09 CAP SCROLL 1 S0A RGB MATRIX 6 S0B RGB MATRIX YUV 5

Default

Level

To X Items.

IMPORTANT NOTE:

Always Exit the Service Mode Following Adjustme nts.

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