Panasonic CT-32SX12F, CT-32SX12UF, CT-32SX12CF, CT-36SX12F, CT-36SX12UF Service Manual

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ORDER NO. MTNC020721C1 B5

Service Manual

Color Television

Main Manual

(NA9FL)

Panasonic

Models

Chassis

CT-32SX12F AP381 CT-32SX12UF AP381 CT-32SX12CF AP381 CT-36SX12F AP382 CT-36SX12UF AP382 CT-36SX12CF AP382

This Service manual is issued as a service guide for the models of the NA9FL family listed above. Included in this manual are a set of schematic, block diagrams, functional descriptions, alignment procedures, disassembly procedures and a complete parts list.

“WARNING! This servicemanual is designed for experiencedrepair techniciansonly and is not designed for use by the general public. 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 only by experienced professional technicians. Any attempt to service or repair the product or products dealt with in this Service Manual by anyone else could result in seriousinjury or death.”

The service technician is requiredtoreadand follow the “Safety Precautions”and“Important Safety Notice” in this main manual.

and distribution is a violation of law.

Important safety notice

Special components are used in this television set which are important for safety. These parts are identified on the schematic diagram by the symbol and printed in BOLD TYPE on the replacement part list. It is essential 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 receiver whose chassis is not isolated from AC power line. Use a transformer of adequate power rating as this protects the technician from accidents resulting in personal injury from electrical shocks. It will also protect the receiver from being damaged by accidental 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,suchas fishpaper, isolation resistors and capacitors, and shields after servicing the receiver. Use only manufacturer’s recommended rating for fuses, circuits breakers, etc. High potentials are present when this receiver is operating. Operation of the receiver without the rear cover introduces danger for electrical shock. Servicing 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 tube. Rough handling may cause it to implode

due to atmospheric pressure. (14.7 lbs per sq. in.). Do not nick or scratch the glass or subject it to any undue 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 servicing the chassis at the bench should incorporate safety glass and magnetic shielding. The safety glass provide shielding for the tube viewing area against x-ray radiation as well as implosion. The magnetic shield limits the x-ray radiation around the bell of the picture 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 40kV without causing x-ray radiation. Before returning a serviced receiver to the owner, the service technician 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 metallic part does not have a return path to the chassis, the reading should 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 current tester (such a Simpson model 229, Sencore model PR57 or equivalent) 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, there is a possibility of a shock hazard and the receiver must 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 the picture 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 31.0 ± 1.0kV. 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.

Horizontal oscillator disable circuit test

This test must be performed as afinal check before the Receiver is returned to the customer. See horizontal oscillator disable circuit procedure check in this manual.

-2-

About lead free solder (PbF)

component

Note: Lead is listed as (Pb) in the periodic table of elements. In the information below, Pb will refer to Lead solder, and PbF will refer to Lead Free Solder. The Lead Free Solder used in our manufacturing process and discussed below is (Sn+Ag+Cu). That is Tin (Sn), Silver (Ag) and (Cu) although other types are available.

This model uses Pb Free solder in it’s manufacture due to environmental conservation issues. For service and repair work, we’d suggest the use of Pb free solder as well, although Pb solder may be used.

PCBs manufactured using lead free solder will have the “PbF” or a leaf symbol stamped on the back of PCB.

Caution

• Pb free solder has a higher melting point than standard solder. Typically the melting point is 50 ~ 70 °F(30~40°C) higher. Please use a high temperature soldering iron and set it to 700 ± 20 °F(370± 10 °C).

• Pb free solder will tend to splash when heated too high (about 1100 °For600°C). If you must use Pb solder, please completely remove all of the Pb free solder on the pins or solder area before applying Pb solder. If this is not practical, be sure to heat the Pb free solder until it melts, before applying Pb solder.

• After applying PbF solder to double layered boards, please check the component side for excess solder which may flow onto the opposite side. (see figure below)

component

remove all of the

excess solder

slice view

solder

Suggested Pb free solder

There are several kinds of Pb free solder available for purchase. This product uses Sn+Ag+Cu (tin, silver, copper) solder. However, Sn+Cu (tin, copper), Sn+Zn+Bi (tin, zinc, bismuth) solder canalsobeused.

0.3mm X 100g

0.6mm X 100g 1.0mm X 100g

-3-

Importantsafetynotice...................2

Safetyprecautions..................2

Generalguidelines..................2

Leakagecurrentcoldcheck...........2

Leakagecurrenthotcheck ...........2

X-rayradiation.....................2

Horizontal oscillator disable circuit test . . 2

Servicenotes ...........................5

Leadless chip component

(surfacemount).................5

Componentremoval ................5

Chip component installation . . ........5

HowtoreplaceFlatIC...............5

Horizontal oscillator disable circuit . . . . . 6

Receiverfeaturetable....................7

Locationofcontrols(receiver).............9

Quick reference control operation . . . . . . 9

Locationofcontrols(remote).............10

Disassemblyforservice .................11

Backcover.......................11

A-Board.........................11

L-Board.........................11

Speakers........................11

Keyboard push button assembly. . . . . . 11

Disassembly for CRT replacement . . . . 11

CRTreplacement .................11

Backcoverremoval.....................13

Chassis service adjustment procedures . . . . 14

140.0V B+ Voltage confirmation . . . . . . 14

Sourcevoltagechart...............14

Highvoltagecheck ................14

Purityandconvergenceprocedure ........15

When the CRT or the yoke is replaced . 15

Verticalrastershiftadjustment .......15

Initial center static convergence . . . . . . 16

Purityadjustment..................16

Finalconvergenceprocedure........16

Dynamic corvergence adjustment . . . . . 16

DY(YHC,YV,XV)adjustment........16

YV Adjustment (VR1 for

Horizontal dynamic convergence). . 16 YH Adjustment (VR2 for

vertical dynamic convergence) . . . . 17

XV Adjustment

(preciseadjustment)............17

Permalloy convergence corrector

strip(partNo.0FMK014ZZ) ......17

DAFadjustment...................17

Servicemode(electroniccontrols).........19

Quickentrytoservicemode.........19

To toggle between aging and

servicemodes.................19

Exitingtheservicemode............19

Tocheckcolors...................19

Entering service mode

(open-back method) . . . . . .......19

Tocheckpurity ...................21

Instructional flow chart for service mode 22

Service adjustments (electronic controls). . . 24

Sub-Contrastadjustment............24

Sub-Brightness(BRIGH)............24

Tint/Coloradjustment ..............24

Tint/Color adjustment

(Norainbowpattern)............25

Color temperature adjustment

(B/WTracking) ................25

Completeadjustment...............25

Horizontalcentering(H-POS)........26

Horizontal width adjustment (H-WIDTH) 26 Horizontal trapezoid

adjustment(HTRAP)............26

Parallelogram adjustment (R524) . . . . . 26

East west PCC balance

adjustment(SIDE)..............26

Vertical linearity adjustment (V-C). . . . . 27

Vertical correction adjustment (V-S) . . .27 Vertical size and vertical position

adjustment(VEAMP&VRAS) ....27

PCCadjustment(PCC).............27

Corner PCC adjustment

(TOPG, TOPSL, BTMG, BTMSL) . .27

MTScircuitadjustments ............28

Inputleveladjustment(MTSIN).......28

Stereo separation adjustment

(SEPAL&SEPAH).............28

Clockadjustment(CLOCK)..........28

Service adjustments

(mechanicalcontrols)...........28

Focus(partofT551)...............28

Audiosignalpathblockdiagram ..........29

Videosignalpathblockdiagram ..........30

Description of connectors. . . . ............31

Component identification . . . . ............33

Partslist ..............................36

Schematics, voltages and waveforms

A-Boardschematic....................50

A-Boardvoltages.....................54

D-Boardschematic....................56

D-Board voltages . . . . . . . . . ............59

A-Boardwaveforms...................60

G-Boardschematic ...................62

G-L-Boardvoltages...................65

L-Boardschematic....................66

A-Boardpcb.........................68

D-Boardpcb.........................70

G-Boardpcb.........................72

L-Boardpcb.........................74

-4-

Service notes

Note: These components are affixed with glue. Be careful not to break or damage any foil under the

component or at the pins of the ICs when removing. Usually applying heat to the component for a short time while twisting with tweezers will break the component loose.

Leadless chip component (surface mount)

Chip components must be replaced with identical chips due to critical foil track spacing. There are no holes in the board to mount standard transistors or diodes. Some chips capacitor or resistor board solder pads may have holes through the board, however the hole diameter limits standard resistor replacement to 1/8 watt. Standard capacitor may also be limited for the same reason. It is recommended that identical components be used. Chip resistor have a three digit numerical resistance code - 1st and 2nd significant digits and a multiplier. Example: 162 = 1600 or 1.6kΩ resistor, 0 = 0Ω (jumper). Chip capacitors generally do not have the value indicated on the capacitor. The color of the component indicates the general range of the capacitance. Chip transistors are identified by a two letter code. The first letter indicates the type and the second letter, the grade of transistor. Chip diodes have a two letter identification code as per the code chart and are a dual diode pack with either common anode or common cathode. Check the parts list for correct diode number.

Component removal

1. Use solder wick to remove solder from component end caps or terminal.

2. Without pulling up, carefully twist the component with tweezers to break the adhesive.

3. Do not reuse removed leadless or chip components since they are subject to stress fracture during removal.

Chip component installation

1. Put a small amount of solder on the board soldering pads.

2. Hold the chip component against the soldering pads with tweezers or with a miniature alligator clip and apply heat to the pad area with a 30 watt iron until solder flows. Do not apply heat for more than 3 seconds.

TYPE

Chip components

GRADE

SOLDER CAPS

How to replace Flat-IC

- Required Tools -

• Soldering iron • De-solder braids

• Iron wire or small awl • Magnifier

1. Remove the solder from all of the pins of a Flat-IC by using a de-solder braid.

De-Solder

Flat-IC

2. Put the iron wire under the pins of the Flat-IC and pull it in the direction indicated while heating the pins using a soldering iron. A small awl can be used instead of the iron wire.

Iron wire

Pull

Soldering iron

3. Remove the solder from all the pads of the Flat-IC by using a de-solder braid.

Soldering iron

De-Solder braid

Flat IC

4. Position the new Flat-IC in place (apply the pins of the Flat-IC to the soldering pads where the pins need to be soldered). Properly determine the positions of the soldering pads and pins by correctly aligning the polarity symbol.

Polarity symbol

123.....

5. Solder all pins to the soldering pads using a fine tipped soldering iron.

braid

Awl

ANODES

MH DIODE

TRANSISTOR

COMMON CATHODE

SOLDER CAPS

CAPACITOR

1ST DIGIT

RESISTOR

2ND DIGIT

MULTIPLIER =1600 = 1.6k

Solder

Soldering iron

6. Check with a magnifier for solder bridge between the pins or for dry joint between pins and soldering pads. To remove a solder bridge, use a de-solder braid as shown in the figure below.

De-Solder braid

Solder bridge

Soldering iron

-5-

Service notes (continued)

IMPORTANT: To protect against possible damage to

the solid state devices due to arcing or static discharge, make certain that all ground wires are securely connected.

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 ground ( ) or

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

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.

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

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

the manufacturer’s parts center using the parts numbers shown in this service 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 identical specification.

Horizontal oscillator disable circuit

This chassis employs a special circuit to protect against excessive high voltage and beam current. If, for any reason, the high voltage and beam current exceed a predetermined level this protective circuit activates and detunes the horizontal oscillator that limits the high voltage. The over-voltage protection circuit is not adjustable. However, if components indicated by the

symbol on the schematic in either the horizontal sweep system or the over-voltage protection circuit

itself are changed, the operation of the circuit should be checked using the following procedure:

Preparation

1. Connect receiver to AC 120 Volts. Do not turn ON.

2. Connect HIGH VOLTAGE meter to 2nd anode (H.V. button).

Note: Use cold ground( ) for negative lead.

3. Connect the ammeter serial from the flyback anode lead to the picture tube anode socket.

4. Prepare HHS jig to be connected between TPD50 and TPD51 as shown in Fig. 2.

Procedure

1. Open connector A17.

2. Turn power ON and apply a white pattern.

3. Set current within 50-100µΑ picture and bright controls.

4. Turn power OFF.

5. Connect HHS jig between TPD50 and TPD51 (VR should be turn fully clockwise).

6. Turn power on.

7. Turn slowly the variable resistor to increase the current until the horizontal sync frequency abruptly increases indicating that the horizontal frequency is just beginning to pull out of sync. Maintain the

current within and bright controls

8. Observe the high voltage meter. HIGH VOLTAGE should read less than 36kV.

9. Turn power OFF, remove HHS jig, HV meter, ammeter and connect A17 connector.

10. Turn power ON. Reset PICTURE and BRIGHTNESS controls. Confirm B+ 140V±1.5V with 120V AC applied.

by changing the

50-100µΑ by changing the picture

Note: If high voltage is not within the specified

limit, the cause must be determined before the receiver is returned to the owner.

Equipment needed to check the disabled circuit:

1. DC ammeter

2. High voltage meter (0- 50kV electrostatic)

3. Variac or isolation transformer

4. HHS jig (see Fig. 2)

TPD50

100Ω

Figure 2. HHS jig

1KΩ

TPD51

-6-

Receiver feature table

FEATURE\MODEL CT-32SX12F/UF/CF CT-36SX12F/UF/CF

Chassis NA9FL Number of channels 181 Menu language Eng/Span/Fr Closed Caption X V-Chip (USA/CANADA) X Remote model number EUR7613Z10 Picture tube MDDA Comb filter ADV 3 DIG (NEW) VM X(DIGITAL) V/A norm (X=BOTH) X Color temp X Preset/input labeling X Video picture memory X MTS/SAP/DBX X BASS/BL/TRE control X AI Sound X Surround X SPATIALIZER/BBE BBE Built-in audio power 10W X 2 Number of speakers 2 A/V in (rear/front) 3(2/1) S-VHS input (rear/front) 1/1 Component input

(Y,Pb,Pr) Audio Out

(FAO: F, VAO: V) EPJ/HPJ/MISC HPJ Dimensions mm

(WxDxH) in Weight (kg/lbs) 72.5/159.83 98.5/217.15 Power source (V/Hz) 120/60 Anode voltage 31.0kV ± 1.0kV Video input jack Audio input jack 500mV RMS 47kΩ

894x685x809

35.19x26.96x31.85

p-p

F,V

1049.5x742x895

41.32x29.21x35.23

75Ω,phono jack

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

Table 1. Receiver features

-7-

Board description table

BOARD CT-32SX12F/UF/CF CT-36SX12F/UF/CF Description

A-Board TNP2AH037 AC AA MAIN CHASSIS

G-Board TNP2AA113

L-Board TNPA1673 AC CRT BOARD D-Board TNP2AH041 AB NIL POWER SUPPLY

*Note:

When ordering a replacement board assembly,

NIL KEY BOARD,

FRONT A/V

append an “S” to the board number.

Example: To order the A-Board for CT-27SX12MF, the

replacement board is TNP2AH025AFS.

-8-

Location of controls (receiver)

POWER

Remote control sensor

VOLUME

2 4 53

CHANNEL ACTION TV/VIDEO

Figure 3. Location of controls (receiver).

Quick reference control operation

Power button - Press to turn ON or OFF. Volume buttons - Press to adjust sound level, or to adjust audio menus, video menus,

and select operating features when menus are displayed Channel buttons - Press to select programmed channels. Press to highlight desired

features when menus are displayed. Also use to select cable converter box channels

after programming remote control infra-red codes (the TV/AUX/CABLE switch must be set in CABLE position).

Front A/V jacks

Controls inside front door

Action button - Press to display main menu and access on screen feature and

adjustment menus.

TV/Video button - Press to select TV or video input.

-9-

Location of controls (remote)

POWER button

Press to turn ON and OFF.

MUTE button

Press to mute sound.

A second press resumes sound.

TV, VCR, DBS/CBL, DVD

Press to select remote operation

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/DBS CHANNEL

Component function buttons.

TV/VIDEO button

Press to select TV or Video input.

CH (channel) buttons

Press to select channels.

Use with volume buttons to

navigate in menus.

GUIDE, EXIT buttons

DBS functions button

RECALL button

Press to display time, channel, sleep

timer and other options

SAP button

Press to access second audio program

MENU button

Press to access DBS or DVD menus

Figure 4. Location of controls (remote).

EUR7613Z10

-10-

Disassembly for service

Back cover

Remove all the screws marked with an arrow( ) from the back of the receiver.

Note: Screw configuration, type, and number

of screws vary depending on the model of the receiver serviced and the application; various models are covered in this manual. Use same hardware when reassembling the receiver.

• 4 screws at the top edge of the receiver.

• 3 screw by the A/V jacks.

• 1 screw at each lower corner of the receiver.

• 1 screw by the retainer plate of the AC power cord.

A-Board - Main chassis

The A-Board assembly rest on a chassis tray along with the D-Board. Slide chassis tray out. Gently lift tray and pull out. Disconnect plug connectors; release wire ties and holders as required for complete chassis removal.

1. A & D-Boards are secured to the chassis tray with screws.

2. The A-Board is mated to the D-Board by three flexible connectors: A5, A6 & A7 (D5, D6 & D7 on the D-Board, respectively), A1, A 2 & A3 (G1, G2 & G3 on the G-Board, respectively), D40 to G40. To remove either boards, unplug the connectors on the A-Board.

Note: Some tie-wraps that secure the wire dressings

may need to be unfastened for chassis removal.

L-Board - CRT output

Plugs into the socket on the CRT neck. To remove this board, first unplug the board from the CRT neck, then disconnect L1, L2 & L3 connectors, to disconnect the focus F1 (red cable) & F2 (white cable) cables, pull the tab and release the cables, finally disconnect the screen cable from the D-Board fly-back. To reinsert back the cables, remember the original position of cables, F1 (red cable) goes to A on the CRT socket and F2 (white cable) goes to B on the CRT socket.

Press tab

leftward to

release cables

Pull cables upwards

To release screenGND cables from L-Board L11& L12 connectors, insert a wire in both sides of connector and pull upwards the cable, then remove the wire (see Fig. 6)

Pull

Insert wire

cable upwards

Figure 6. L-Board screen GND cables release

Speakers

Speaker is secured to the cabinet’s front with 4 screws.

Keyboard push button assembly

Fastened to the inside of the cabinet front.

Disassembly for CRT replacement

1. Discharge the CRT as instructed in the safety precautions (see page 2).

2. Disconnect the yoke (DY) plug, degaussing coil (DEG) plug and the CRT 2nd anode button from the board.

3. Remove the L-Board from the CRT socket and unplug the black wires (CRT dag ground) L11 & L12.

4. Lift the main chassis (A-Board) and all mounted boards completely out with the CRT Board attached.

CRT replacement

1. Perform disassembly for CRT replacement procedure.

2. Insure that the CRT H.V. Anode button is discharged before handling the CRT. Read the safety precautions (see page 2) on handling the picture tube.

3. Remove the components from the CRT neck and place the cabinet face down on a soft pad.

4. Note the original order for the CRT mounting hardware as they are remove from the CRT mounting brackets at each corner of the CRT.

5. Remove the CRT with the degaussing coil and the dag ground braid attached.

Figure 5. F1 & F2 cables release

-11-

Note:

After servicing the receiver, remember to dress the cables.

Disassembly for service (continued)

Note: To remove the four brackets holding

the degauss coil from the corners of the CRT, first remove the CRT from the cabinet, then remove the brackets by pressing the tab on the bracket and pull upwards. These brackets are included in the degauss coil kit, for part number, please see parts list section (see Fig. 7).

Degaussing coil bracket

Degaussing coil

Press tab then pull upwards

Note: Reuse all the clampers and mounting

brackets from the degaussing coil and screen, and when remounting the degaussing coil assure that is not touching the speakers, this can be done by placing some tape (see Fig. 7), this may cause mask vibration. The mounting brackets and clampers are not supplied with the replacements.

Important notice:

When ordering the CRT, please order CRT and CRT KIT also. Please see parts list section for part numbers

Figure 7. Brackets removal

6. Note the original locations and mounting of the degaussing coil and the dag ground assembly to insure proper reinstallation on the replacement CRT.

To remove and remount the degaussing coil:

The degaussing coil is held in place by clampers fastened to the CRT corner ears. These clampers must be installed onto the replacement CRT prior to mounting the degaussing coil.

To remove and remount the dag ground braid:

a.Unhook the coil spring from the bottom corners

of the CRT ears.

b.Release the braid loop from the upper corners of

the CRT ears.

7. Mount the dag ground braid on the replacement CRT. Position the degaussing coil with new ties. Dress coil as was on the original CRT.

8. Replace the components on CRT neck and reinstall into cabinet. Verify that all ground wires and circuit board plugs get connected.

-12-

Back cover removal

4 screws at top edge

1 screw at lower

left corner

1 screw

1screw

Figure 8. Back cover removal

-13-

1screw

1 screw at lower

right corner

Chassis service adjustment procedures

All service adjustments are factory preset and should not require adjustment unless controls and/or associated components are replaced.

Note: Connect the (-) lead of the voltmeter to the appropriate ground. Use heat sink when the HOT ground symbol

( ) is used. Otherwise, use COLD ground ( ) — tuner shield.

A-BOARD

IC002

IC2301

T U N E R

L008

Q002

IC001

C3023

Q804

IC881

IC3001

A/V REAR INPUTS

IC882

IC883

LOCATED ON BOTTOM OF BOARD

D-BOARD

Q751

Fly-Back

L826

L824

D827

C840

D825

T801

Q801

Q551

D511

MOMENTARILY CONNECT A JUMPER FOR ENTERING SERVICE MODE (TP8 to COLD GND)

140.0V B+ Voltage confirmation

1. Set the BRIGHT and the PICTURE to Minimum by using the picture menu.

2. Connect the DVM between ground ( ).

3. Confirm that B+ voltage is 140.0V ± 1.5V.This

TPP17 (+ side) and cold

LOCATION (D-Board) VOLTAGE

TPD7

(by D511)

220V 220.0V ± 9.0V

LOCATION (A-Board) VOLTAGE

TP A6

(by IC883)

MAIN12V 12.0V ± 0.5V

voltage supplies B+ to the horizontal output & flyback circuits.

Source voltage chart

120V AC line input. Set the BRIGHT and the PICTURE to minimum by using the picture menu. Use cold

ground

(

) for the (-) lead of the DVM.

TP A7 TP A8 TP A16 TP A18

(by IC3001)

(by L008)

(by Q002)

(by C3023)

MAIN 9V 9.0V ± 0.5V MAIN 5V 5.0V ± 0.3V

STBY 3.3V 3.3V ± 0.2V

BTL30V 32.0V ± 2.0V

LOCATION (D-Board) VOLTAGE

TPP17 TPP25 TPP19

(by D825)

(by D827)

(by Q804)

+B2 140.0V ± 1.5V

9V 9.0V ± 1.5V

15V 15.0V ± 2.0V

Adjust Picture menu for normalized video adjustments.

High voltage check

1. Select an active TV channel and confirm that horizontal is in sync.

2. Adjust BRIGHTNESS and PICTURE using PICTURE Icon menu so video just disappears.

TPP20 TPP21

(by C840)

(by L826)

15V(VER.) 15.0V ± 1.5V

-15V (VER.) -15.0V ± 1.5V

3. Confirm B+ 140.0V is within limit.

4. Using a high voltage meter confirm that the high voltage is 31.0kV ± 1.0kV.

TPP22 (

by L824

) SOUND 32.5V ± 2.0V

-14-

Purity and convergence procedure

Adjustment is necessary only if the CRT or the deflection yoke is replaced or if the setting was disturbed. The complete procedure consists of:

1. Vertical raster shift adjustment. (Only for models

with purity/convergence assembly with 4 pairs of rings).

2. Initial static convergence.

3. Setting the purity.

4. Final static convergence.

WhentheCRTortheyokeisreplaced

Place the yoke on the CRT neck (do not tighten the clamp).

Place the vertical raster shift tabs at 3 o’clock (90ofrom the purity and convergence tabs)

R&B Convergence Rings

R&B&G Convergence Rings

G3 G4

Vertical Raster Shift Ring

Figure 9. Positioning of purity/convergence assembly

(4 pairs of rings)

Purity Rings Centered Over G3/G4 Gap

Vertical raster shift adjustment

(only for models with purity/convergence assembly with 4 pairs of rings).

Apply a green pattern with a horizontal line, adjust the deflection yoke so that has no tilt, then secure it. Adjust center line of the pattern with the mechanical center of the CRT, this center is determined by two marks at the side edges of the screen. To adjust the line, once the vertical raster shift tabs are place at 3 o’clock to reduce its magnetic field effect (see Fig. 9 and Fig. 10) open the tabs the same angle from the center, until the center line of the pattern becomes a straight line, centered with the marks of the CRT. (see Fig. 11)

Center line

from pattern

Mechanical

Center Marks

Vertical raster shift tabs

Figure 11. Vertical raster shift adjustment

(4 pairs of rings assembly)

Open the same angle from center

R&B&G Convergence rings

R&B Convergence rings

Vertical raster

shift rings

Purity rings

Figure 10. Positioning of purity/convergence

assembly (4 pairs of rings)

Turn the receiver ON. Operate the receiver for 60 minutes using the first purity check field (white screen) to stabilize the CRT.

Fully degauss the receiver by using an external degaussing coil.

Slide the deflection yoke back and forth on the neck of the CRT until it produces a near white, uniform raster.

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Initial center static convergence

Connect a dot/cross hatch generator to the receiver and tune in a signal. Observe misconvergence at center of the screen only. Adjust the R&B pole magnets; by separating tabs and rotating to converge blue with red. Adjust the R&B and R&B&G pole magnets: by separatingtabsandrotatingtoconvergeblueandred (magenta) with green.

Note: Precise convergence adjustment at this point

is not important.

Purity adjustment

When the receiver is in the service mode for making electronic adjustments, press the RECALL button on the remote control to enter purity check. (See the service adjustments electronic controls procedure). Operate the receiver for 60 minutes using the first purity check field (white screen) to stabilize the CRT. Fully degauss the receiver by using an external degaussing coil. Press the RECALL button on the remote control again until the purity check (green screen) appears. Loosen the deflection yoke clamp screw and move the deflection yoke back as close to the purity magnet as possible. Adjust the purity rings to set the vertical green raster precisely at the center of the screen (see Fig. 12).

NOTES:

1. CRT warm up with white screen (three guns activated) is needed to stabilize the shadow mask expansion.

2. Initial center static convergence (roughly centers three gun beams) is required in order to performpurityadjustment.

Figure 12. Green raster adjustment

Slowly move the deflection yoke forward until the best overall green screen is displayed. Tighten the deflection yoke clamp screw. Press the RECALL button on the remote control again until the purity check blue and red screens appear and observe that good purity is obtained on each respective field. Press the RECALL button on the remote control again until purity check (white screen) appears. Observe the screen for uniform white. If purity has not been achieved, repeat the above procedure.

Green raster

Final convergence procedure

(see Fig. 17 through Fig. 19):

Note: Vertical size and focus adjustments must be completed prior to performing the convergence adjustment. Connect a dot pattern generator to the receiver. The BRIGHTNESS level should not be higher than necessary to obtain a clear pattern.

Convergethe redand the bluedots at the center of the screen by rotating the R&B pole static convergence magnets. Align The converged red/blue dots with the green dots at the center of the screen by rotating the R&B&G pole static convergence magnets. Melt wax with soldering iron to reseal the magnets. Slightly tilt vertically and horizontally (do not rotate) the deflection yoke to obtain a good overall convergence. If convergence is not reached at the edges, insert permalloy (see following section) from the DY corners to achieve proper convergence. Recheck for purity and readjust if necessary. After vertical adjustment of the yoke, insert wedge at 11 o’clock position, then make the horizontal tilt adjustment. Secure the deflection yoke by inserting two side wedges at 3 and 7 o’clock positions. Apply adhesive between tab (thin portion) of wedge and CRT and place tape over the tab to secure to the CRT.

Dynamic corvergence adjustment

Use this for a precisely overall convergence adjust at the edges.

DY(Y

HC,YV,XV) adjustment

V Adjustment

(VR1 for Horizontal dynamic convergence)

1. Apply a crosshatch pattern.

2. Adjust contrast and brightness customer controls to obtain a correct picture.

3. With a driver adjust VR1 (located in deflection yoke board Fig. 19) to obtain a proper corvergence at top and bottom of the screen (see Fig. 13)

B&R

-16-

B&R G

Figure 13. VR1 Adjustment (YV)

H Adjustment

Y (VR2 for vertical dynamic convergence)

1. Apply a crosshatch pattern.

2. Adjust contrast and brightness customer controls to obtain a correct picture.

3. With a driver Adjust VR2 (located in deflection yoke board Fig. 19) to obtain a proper corvergence at left and right side of the screen. (see Fig. 14)

B&R

Figure 14. VR2 Adjustment (YH)

XV Adjustment (precise adjustment)

1. Apply a crosshatch pattern.

2. Adjust contrast and brightness customer controls to obtain a correct picture.

3. With a driver adjust the coil located in deflection yoke board to obtain a proper convergence horizontally.

Permalloy convergence corrector strip (part No. 0FMK014ZZ)

Thisstripisusedinsomesetstomatchtheyokeand CRT for optimum convergence. If the yoke or CRT is replaced, the strip may not be required. First converge the set without the strip and observe the corners.

If correction is needed:

1. Place strip between CRT and yoke, in quadrant needing correction. Slowly move it around for desired results.

2. Press adhesive tightly to the CRT and secure with tape.

DAF adjustment

Preparation:

1. Apply a crosshatch pattern.

2. Set user controls, bright to center and picture to max.

3. Connect a frequency counter to TPD10.

Procedure:

1. Connect channel one of the oscilloscope with 100x1 probe to TPP33 (pin-1 T1551).

2. Connect channel two of the oscilloscope with 10x1 probe to CRT HEATER (L-Board).

3. Adjust “HDAFP” so both waves are in the same position.

4. Adjust “HDAFW” so TPP33 is 1.5

TPP33

± 0.5kVpp.

B&R

B&R G

Figure 15. XV adjustment

Note: Apply a red pattern and confirm purity, if purity

is poor, repeat purity adjustments.

HEATER PIN

Figure 16. DAF adjustment

-17-

RGB

Figure 17. Vertical yoke movement

RGB

Figure 18. Horizontal yoke movement

Astheyokeistilted vertically, the rasters produced by the outside guns rotate in opposite directions.

Raster produced from one of the outside electron beams

Raster from the other side electron beam

Static convergence magnets are set for center convergence

As the yoke is tilted horizontally, one raster gets larger while the other gets smaller

2Poles(VRSAdj)

4Poles

2 poles (purity)

For adjustment

of DY (Y

HC/YV/XV)

dynamic convergence

6Poles

Figure 19. Convergence magnets and convergence controls

IMPORTANT NOTE:

Always exit the service mode

following adjustments.

-18-

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 technician

reads all the way through and understand the following procedure 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 servicemodemaybeusedasaquick guide.

Quick entry to service mode:

When minor adjustments need to be done to the electronic controls, the method of entering the service 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” twice to exit menus.

4. Tune to the channel 124.

5. Adjust VOLUME to minimum (0).

6. Press VOL (decrease) on receiver .Red“CHK” appears in upper corner.+

Note: After receiver is set into service mode,

set TIMER back to NO.

MTS MTSIN SEPAL SEPAH CLOCK CLOCK HHSTH VIDEO COLOR BRIGHTINT CONT

PIP PCONT HDEF

FINE VDEF VRAS VEAMP V-C

DAF CTEMP

B-Y_G CUT_G CUT_R CUT_B BRT R-DR B-DR

H-POS H-WID PCC TOPG BTMG PCCHG PCCLG PCCHS PCCLS

TOPSL BTMSL HDAFS

WARMRWARMB COOLR COOLB

VDAFG

TRAP SIDE HTRAP

V-S VPOS

Figure 20. Service mode menu adjustments.

Exiting the service mode:

This TV goes out from service mode when it is unplugged or turned OFF . To exit the service mode, turn the TV OFF or unplug the TV from AC.

Other method

Press ACTION and POWER on the receiver simultaneously for at least 2 seconds. 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 when exited by pressing ACTION and POWER on receiver.

IMPORTANT NOTE:

Always check that the TV exits the

service mode.

To check colors:

Press RECALL on the remote control when in service mode (red “CHK” is displayed) to enter the purity field check mode.

NORMAL SCREEN

To toggle between aging and service modes:

While the “CHK” is displayed on the left top corner oftheCRT,pressing“ACTION”and“VOL”uponthe TV simultaneously will toggle between the modes. Red “CHK” for service and yellow “CHK” for aging.

7. Press POWER on the remote control to display the service adjustment modes menu, select adjustment by pressing the volume right/left buttons and channel up/down buttons on the remote and ACTION to enter the adjustment.

Press RECALL again to select desired field.

BLUE

SCREEN

GRN.

SCREEN

RED

SCREEN

WHITE

SCREEN

Figure 21. Purity check field mode.

Helpful hints

Entering service mode (open-back method)

• While the receiver is connected and operating in normal mode, momentarily short test point

FA1(A15pin2)to cold ground ( ) (A-Board).

The receiver enters the aging mode

Yellow letters “CHK” appear in the upper left corner of

the screen. (The VOLUME up/down will adjust rapidly).

Note: When entering using this method, the only

waytogooutofservicemodeistopress ACTION and POWER on the receiver simultaneously for at least 2 seconds.

-19-

Service mode (electronic controls, continued)

MTS Adjustments Description Default Level New Level

MTSIN INPUT LEVEL 25 SEPAL LOW LEVEL SEPARATION 08

SEPAH HIGH LEVEL SEPARATION 1D

CLOCK Adjustments Description Default Level New Level

CLOCK CLOCK 128 HHSTH ------- FF

VIDEO Adjustments Description Default Level New Level

COLOR COLOR 01 6D

TINT TINT 4D

BRIGHT SUB-BRIGHTNESS 2D

CONT SUB-CONTRAST 60

B-Y_G MAGENTA TINT ADJ 80 CUT_G GREEN CUT-OFF 02 2D CUT_R RED CUT-OFF 02 28 CUT_B BLUE CUT-OFF 02 23

BRT BRIGHT 2D R DR RED DRIVE 09 68 B DR BLUE DRIVE 08 4E

HDEF Adjustments Description Default Level New Level

H POS HORIZONTAL POSITIONING 8F

H WID HORIZONTAL WIDTH 4F

PCC PINCUSHION CORRECTION 1E TOPG TOP CORNER PINCUSHION 13 BTMG BOTTOM CORNER PINCUSHION 14

TRAP TRAPEZOID 7E

FINE Adjustments Description Default Level New Level

PCCHG PINCUSHION HIGH 15 PCCLG PINCUSHION LOW 07 PCCHS PINCUSHION HIGH OF

PCCLS PINCUSHION LOW OF TOPSL TOP CORNER PINCUSHION SLICE LEVEL 0D BTMSL BOTTOM CORNER PINCUSHION SLICE LEVEL OF

SIDE E-W PINCUSHION ADJUSTMENT 46

HTRAP HORIZONTAL TRAPEZOID 20

-20-

Service mode (electronic controls, continued)

VDEF Adjustment Description Default Level New Level

V RAS VERTICAL POSITION 2D

VEAMP VERTICAL SIZE BB

V-C VERTICAL LINEARITY 22 V-S VERTICAL S CORRECTION 0E

DAF Adjustments Description Default Level New Level

HDAFP HORIZONTAL DAF PHASE 00 D0

HDAFW VERTICAL DAF GAIN 60

VPOS VPOS 80

CTEMP Adjustments Description Default Level New Level

WARMR ------- 60 WARMB ------- 60

COOLR -------- 60

COOLB -------- 60

IMPORTANT NOTE:

Always exit the service mode

following adjustments.

To check purity:

Press the RECA LL button on the remote control when in service mode (red “CHK” is displayed) to enter the purity field check mode.

NORMAL SCREEN

Press RECALL again to select desired field.

BLUE

SCREEN

GREEN

SCREEN

RED

SCREEN

Figure 22. Purity check field mode.

IMPORTANT NOTE:

Always exit the service mode

following adjustments.

WHITE

SCREEN

-21-

Instructional flow chart for service mode

NORMAL MODE

ENTRY TO SERVICE MODE

• Select CABLE mode.

•SetSLEEP time for 30 Min.

• Tune to Channel 124.

• Adjust VOL U ME to minimum.

•PressVOL DOWN on receiver.

To exit service mode, just unplug TV from AC line or turn it OFF; or press ACTION and POWER on the receiver simultaneously for at least 2 seconds.

GRN.

SCREEN

BLUE

SCREEN

AGING MODE

• Press VOL UP and ACTION simultaneously on TV

• Yellow“CHK” appears in upper left corner of screen.

• VOLUME up/down operate rapidly.

• Customer controls are set to nominal level.

Adj.

EXIT

needed?

Press Action + Volume up simultaneously (on receiver)

SERVICE MODE

• “CHK” turns red.

• VOLUME up/down operate normally.

• Customer controls are set to nominal level.

(ON REMOTE)

RECALL

WHITE

SCREEN

RED

SCREEN

WHITE

SCREEN

(ON REMOTE)

To view the adjustments menu press POWER on remote.

IMPORTANT NOTE:

Always verify that TV is out

from service mode.

RECALL

Adj.

needed?

POWER

(ON REMOTE)

ACTION

(ON REMOTE)

ACTION

(ON REMOTE)

EXIT

To exit service mode, just unplug TV from AC line oturnitOFF;orpressACTION and POWER on the receiver simultaneously for at least 2 seconds.

Once in adjustments menu press VOL right/left and CH up/down on remote to select adjustment.

Press ACTION on remote to enter the adjustment.

Figure 23.Flow chart for service mode.

-22-

Instructional flow chart for service mode - (continued)

ON REMOTE CONTROL TO

VOL

(previous/next adjustment

ON REMOTE TO

VOL

to make adjustment

IMPORTANT NOTE:

Always verify that TV is out

from service mode.

POWER

(ON REMOTE)

Press POWER or ACTION on remote to exit the adjustment.

EXIT

To exit service mode, just unplug TV from AC line or turn it OFF; or press ACTION and POWER on the receiver simultaneously for at least 2 seconds.

Figure 24. Flow chart for service mode (continued).

-23-

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