Panasonic HDTV P7, PT-51HX42 F/CF Schematic

ORDERNO.MTNC020413A1 B2

ServiceManual

HDTVMONITOR

SimplifiedManual

(P7)

Panasonic

Models

PT-51HX42F EP824 PT-51HX42CF EP824

Chassis

ThissimplifiedservicemanualisissuedtoaddmodelsoftheP7familylistedabovetothemainservicemanualorder No.MTNC020411C1(PT-47WX52F).Includedinthismanualareuniquecharacteristicsandacompletepartslist.

“WARNING!ThisServiceManualisdesignedforexperiencedrepairtechniciansonlyandisnotdesignedforusebythegeneralpublic. Itdoesnotcontainwarningsorcautionstoadvisenon-technicalindividualsofpotentialdangersinattemptingtoserviceaproduct. Productspoweredbyelectricityshouldbeservicedorrepairedonlybyexperiencedprofessionaltechnicians.Anyattemptto serviceorrepairtheproductorproductsdealtwithinthisServiceManualbyanyoneelsecouldresultinseriousinjuryordeath.”

Theservicetechnicianisrequiredtoreadandfollowthe“SafetyPrecautions”and“ImportantSafetyNotice”intheMainManual.

anddistributionisaviolationoflaw.

Important safety notice

Special components are used in this projection television which are important for safety. These components 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

isolation transformer

during the servicing of a PTV 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 PTV 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 PTV. Use only manufacturer’s recommended rating for fuses, circuits breakers, etc. High potentials, as high as 32.5kV, are present when this PTV is operating. Operation of the PTV 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

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.

. Rough handling may cause it to implode

X-ray precautions

The front area (between the projection tube and the lens) is enclosed by a metal box to ensure positive safety during normal and abnormal conditions when checking and repairing. To fully ensure safety, the following precautions must be observed.

1. Do not remove the lens or metal box.

2. Make sure to turn the power OFF when the lens is removed or when checking the cleanliness of the lens.

3. Do not remove the lens or metal box to check the projection tube for operation by watching it directly. Use a mirror or paper to view the image.

Before returning a serviced PTV 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 jumperbetween the two plug prongs. Press the POWER switch ON. Measure the resistance between the jumpered AC plug and expose metallic parts such as screw heads,

ServiceManual

should always be used

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 (see figure 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 and 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 expose metallic parts. Verify 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 PTV 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

Figure 1. Hot check circuit

1500Ω,10W

Insulation test

Connect an insulation tester between an exposed metallic part and AC line. Apply 1080VAC/60Hz for 1 second. Confirm that the current measurement is 0.5mA ~ 2.0mA. Repeat test with other metallic exposed parts.

X-ray radiation

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

PTV is in the high voltage section and the picture tube.

Note: It is important to use calibrated equipment.

Apply all black video signals (1080i) and confirm high voltage measures 31.5 ± 1.0kV. If the high voltage is not within the range, change C514 to 1800pF, 2000pF, 2400pF or 2700pF until the desired value is obtained. Apply NTSC white pattern and confirm the high voltage measures 30.1 ± 1.5kV. Apply HD 1080I white pattern and confirm the high voltage measures 30.1 ± 1.5kV

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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 within 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

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Important safety tests

Measuring H.V.

The anode caps are cemented to the CRTs. To gain access for high voltage measurement, remove the red CRT’s anode lead from the flyback transformer distributor. Grasp the anode lead protective cap at its bottom and squeeze it against the locking cap body inside, rotate 1/4 turn counter clockwise and pull the anode lead sleeve out of the FBT distributor. Connect a high voltage lead (+) from your H.V. meter to the FBT

distributor, and the common (-) to cold ground ( ). (see figure 2).

Grasp protective

Anode lead

rubber cap

Push & rotate

Discharge to CRT chassis

cap counterclockwise to remove

FBT distributor

Figure 2. Removal of FBT leads

Note: Reinsert the anode lead into the FBT

distributor until it is tightly and fully seated. Turn the locking cap clockwise to lock in place.

(EHT) Protector operation check

With the cabinet back removed, apply a nominal 120V AC to the PTV.

Over voltage test Preparation:

1. TurnPTV “OFF”

2. Connect a NTSC signal generator to the antenna terminal.

3. Connect DVM (+) TPD50 and (-) TPD51 on D Board (see figure 4)

4. Connect a H.V. meter (static type, class 0.1) with high voltage leads to high voltage distributor on FBT. (See figure 4)

TPD51 TPD50

D-Board

DVM

D-Board

IC802 PIN 2

OR TPD8

Variable power supply

MA150

100Ω 1/2 W

(+)

(15~25DC)

(-)

HEAT SINK OF Q551

Figure 4. DVM & power supply c onnection.

5. Connect the 15 ~ 25 V DC variable power supply to (+) TPD8 or IC802 pin 2 (D-Board) and (-) heat sink of Q551 (see figure 4).

Procedures:

1. Apply a NTSC white pattern.

2. Turn PTV ON.

3. Adjust the picture or brightness controls so that the DVM reads 16.5 volts ± 0.5 volts.

4. Increase the variable power supply until set turns off. The set should turn off at 16.5 volts ± 0.5 volts (DVM) and high voltage less than 36.4kV.

5. If the DVM reading is other than 16.5 volts ± 0.5 volts, readjust picture or brightness control and repeat steps 3.

6. Turn off the variable supply and confirm that the set will turn on with the remote control.

H.V. METER

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Cold ground

FBT Distributor

CRT

CHASSIS

Figure 3. Measuring H.V.

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Notes about format aspect switching (WX 16:9 or HX 4:3)

and adjustments

Widescreen 16:9 and non-widescreen 4:3 PTVs use the same light box, for this reason is important to set it to the correct version (16:9 or 4:3). To change the format please refer to figure 62 on page 43 on main manual order No MTNC020409C1. Be sure t o select the correct f ormat for the serviced PTV.

Adjustments for NTSC ZOOM included in main manual order No MTNC020409C1 does not apply for models included in this simplified service manual.

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

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

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

X-rayprecautions ..................2

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

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

Insulationtest .....................2

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

About lead free solder (PbF) . . . . . . . ........3

SuggestedPbfreesolder............3

Importantsafetytests....................4

MeasuringH.V.....................4

(EHT) Protector operation check. . . . . . . 4

Notes about format aspect switching

(WX16:9orHX4:3)...................5

andadjustments.........................5

Servicenotes ...........................7

Leadless chip component

(surfacemount).................7

Componentremoval ................7

Chip component installation . . ........7

HowtoreplaceFlat-IC...............7

CRTsetup.............................15

Dynamicfocusadjustments..........15

Convergence alignment template . . . . . 16

Service mode (electronic controls). . . . . . . . . 17

Quickentrytoservicemode.........17

To toggle between aging and

servicemodes.................17

Exitingtheservicemode............17

Tocheckcolors...................17

Table of the service adjustment

item available for each format . . . . . . . . . 18

480i Service mode

(electroniccontrols)..................20

480p Service mode

(electroniccontrols)..................22

1080i Service mode

(electroniccontrols)..................24

Partslist ..............................26

Description of abbreviations guide . . . . . . . . 34

Schematicnotes........................35

Featuretable............................9

Boardsdesignation.....................10

PTV-Locationofcontrols................11

Quick reference control operation . . . . . 11

Remote-locationofcontrols.............12

DisassemblyforService.................13

SpeakerGrilleRemoval.............13

Keyboard Removal (7-Key Button) . . . . 13

SpeakersReplacement.............13

CabinetBackLowerRemoval........13

CabinetBackCoverRemoval........13

CabinetFrontRemoval.............14

ScreenAssembly..................14

K-Boardschematicandlayout............37

G-Boardschematicandlayout............38

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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 chip 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 on the component indicates the general range of the capacitance. Chip transistors are identified by a two letter code. The first letter indicated 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 watts 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

• Sharp pliers (wire cutters and long nose)

1. Cut the pins of the defective IC with the wire cutter pliers, and remove it completely away from the board. If the IC is glued to the board, apply hot air to complete the removal. CAUTION- Do not pull or twist the pliers, it may damage the soldering pads in the board .

Flat-IC

2. Using the soldering Iron and the long nose pliers, remove the IC pins that are still attached to the board.

3. Using the de-solder braid and the soldering Iron, remove the solder from the board soldering pads.

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. Start aligning and soldering Pin No.1, then align and solder the pin in the apposite corner of the IC, this will help to align the rest of the pins.

Polarity symbol

• Magnifier

Soldering Iron

De-Solder Braid

Soldering Iron

ANODES

MH DIODE

TRANSISTOR

COMMON CATHODE

SOLDER CAPS

CAPACITOR

1ST DIGIT

RESISTOR

2ND DIGIT

MULTIPLIER =1600 = 1.6k

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

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

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Solder Bridge

Soldering Iron

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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 all ground wires and CRT DAG wire 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 PTV 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 PTV 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 listed in this service manual, or provide the chassis number and the part reference number.

For optimum performance and readability, all other parts should be replaced with components of identical specification.

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Feature table

FEATURE PT-51HX42F PT-51HX42CF

Chassis P7 Number of channels 181 Menu language Eng/Span/Fr Closed caption (CC) X V-Chip (USA/CANADA) X Picture in Picture (PIP) 2T split 2RF X Remote control number EUR7603Z30 Screen protector W/PROT SCRN Comb filter ADV 3D Y/C (NEW) Color temp X NEW YNR X VM X(DIGITAL) V/A norm BOTH DIGITAL SCAN RATE 1080i, 480p NTSC LINE-DOUBLER 480p SMOOTH PROGRESSIVE MTS/SAP/DBX X Bass/Bl/Trebcontrol X AI sound X SURROUND X Spatializer/BBE BBE Built-in audio power 15WX2 (10%) Number of speakers 2 A/V in (rear/front) 4 (3/1) S-VHS in (rear/front) 2/1 Audio out Fixed & Variable COMPONENT INPUT (Y,Pb, Pr) 2 Dimensions mm

WxDxH in Weight (kg/lbs) 90/198.4 Power source (V/Hz) 120V 60Hz Anode voltage 31.5kV ± 1.0kV Video input jack 1Vp-p 75Ω,phono jack Audio input jack 500mV RMS 47kΩ

1137x653x1361.0

44.8x25.7x53.6

Table 1: Feature T able

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

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Boards designation

BOARD PART NUMBER BOARD DESCRIPTION

A-Board TNP2AH035 signal processing D-Board TNPH0371 power and deflection LB-Board TNP2AA110 blue driver LG-Board TNP2AA111 green driver LR-Board TNP2AA112 reddriver G-Board TNP2AA088 front A/V panel K-Board TNP2AA087 front button panel R-Board TNPA0615AB IR receiver

Table 2: Boards designation

Note: The A-Board (

A-Board both tuners, IC2302, IC7001, IC7002, IC871, IC872, IC873. If any of these components or board is defective repleace it with a new one and take back the defective board to the service center.

Notice: When ordering any board, add and ” S” after the board

Example: If Order D-Board, should be ordered as:

TNP2AH035

suffix application.

) is non-serviceable.Exceptfor

TNPH0371

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PTV - Location of controls

POWER VOLUME CHANNEL ACTION TV/VIDEO

1 2 4 53

Figure 5. Location o f controls PTV

Quick reference control operation

Power - Press to turn ON or OFF.

Volume - Press to adjust sound level, or to adjust audio menus, video menus, and

select operating features when menus are displayed Channel - 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).

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

menus.

TV/Video - Press to select TV or one of the video inputs, for the main picture or the PIP

frame (when PIP frame is displayed).

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Remote - location of controls

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.

TV, VCR, DVD, CBS/CBL 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 displaymain menu and access or

exit on screen features and adjustment menus.

REW, PLAY, FF, TV/VCR, STOP, PAUSE, REC & VCR CHANNEL Buttons

Component function buttons. DBS EXIT& DBS GUIDE Buttons DBS function buttons. LIGHT Button Press to light remote control buttons. SAP Access second audio program ASPECT Select picture size (ratio) to match

programming format MOVE, PIP, SPLIT/SIZE, FREEZE, SWAP,

SEARCH, PIP CHANNEL PIP function buttons

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Figure 6. Location of controls (EUR7603Z30 remote)

For additional information for this remote please refer to the owner’s manual section remote operation, listed on the parts list.

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+ 28 hidden pages