Panasonic PT-50LCX7, PT-56LCX7, PT-56LCX70, PT-50LCZ7, PT-50LCZ70 Service Manual

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LIFI LCD Projection TV

Service Training Guide

“LIFI” series

LIFI = LIght FIdelity

Contents:

 Service Policy  Board Access  No Start Up  Shutdown  Service Mode  Adjustments

720p

PT-50LCX7 PT-56LCX7, 70 PT-56LCX7, 70

1080p

PT-50LCZ7, 70 PT-56LCZ7, 70 PT-56LCZ7, 70

2007

inception

year

Pwr Pwr lamp

Button LED LED

National Training

 Useful Part Numbers

Model PT-56LCX70

shown

Model PT-xxLCX70

Panasonic PT-xxLCX70 LIFI series LCD PTV Repair

 New Lamp Technology 3  Flexible Repair Policy 4

 Access

• Chassis Removal 6

• Assemblies

• Lamp Assembly Removal

• Rear Board Removal

• Power Supply & Tuner Bds.

• Main Bd & Light Engine

 Layout of used & unused Connectors

• Rear View 17

• Top View 18

 No TV Start Up

• Normal Power On Sequence 20

• Dead Set 22

• Power LED blinks continuously 23

 TV Shuts Down

• Error Code Summary 25

• Orange 1X, 3X, 4X (voltage loss) 26

• Orange 2X

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(groups A-D) 7

(group A) 8

(group B) 13

(D) 15

(DT+9V loss / therm fuse) 27

 TV Shuts Down (con’t)

• Orange 6X (Audio out) 28

• Orange 7X, 9X (Communications loss) 29

• Orange 10X (+17Vdc loss) 30

• Lamp Mis-Operation

(troubleshooting clues) 32

• Red 2X, 3X, or 13X ( no lamp) 33

• Quick Lamp Checks & return info 34

• Red 4X (high temp) 37

• Red 5X (no lamp communications) 39

• Red 8X, 9X, 10X, 11X (no fan) 40

• Red 12X (no rear board connection) 41

 Service Mode

• 3 S/M What can they do for me? 43

• Entry & Navigation - S/M 1

• Entry & Navigation - S/M 2

• Entry & Navigation - S/M 3

(TV Reset) 44 (pattern,code) 45 (D Chan SNR)47

 Adjustments after Light Engine Replacement

• Picture Straighten 49

• Mechanical Focus 51

 Video Process; Audio Process 53  Useful Part numbers 55

Model PT-xxLCX70

LIFI New Lamp Technology

• Fast starting (less than 10 sec)

• Higher frequency so there is no lamp “hum”

• Lower RF noise level compared to Mercury Vapor lamps

• High temperature so it must be heat sinked and forced cooled.

• No flicker like mercury vapor lamps at the beginning and end of life

• Long life span Lamp. Warranty is 5 years (original lamp, consumer use).

• Lamp assembly needs: 26Vdc power, and Lamp-On signal (5V) to start (light).

• Microprocessor in the lamp assembly heats for pre-start & sweeps RF frequency for ignition

• Lamp assembly micro communicates with the TV micro (no communications – no shutdown, just audio)

Top lamp fan

Slide # 3

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front

LIFI lamp assembly is underneath Remove the top power supply with fans. Lamp assembly looks like a big heat sink. Comes with small top lamp fan

back

Model PT-xxLCX70

Flexible Service Policy – blocks or boards

blocks

Chassis (OPT/TV unit)

Main Bd.

Tuner Bd.

Lamp unit

RF amp Power Bd.

Lamp unit

boards

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Power Bd.

Rear Jack Bd.

Model PT-xxLCX70

Flexible Service Policy – boards

Parts Available:

1. Front & Rear Fans

2. Lamp Power Supply

3. Lamp Assembly with Lamp Fan

4. Main Board with Light Engine & Optics fan

5. Rear (Jack) Board

6. Power Supply Board

7. Tuner board

Not Shown (front panel location):

8. Front Jack Bd.

9. SD / HDMI board

10. Power Button Bd. W IR receiver

Main bd.

Slide # 5

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Chassis Rear

Easiest remove

hardest

Accessibility Ease:

a) Tuner Bd.

b) Lamp Pwr Bd. c) Rear Panel Bd. d) Lamp Assembly e) TV Pwr Supply Bd f) Main Bd w optics

Model PT-xxLCX70

Chassis Pull

Chassis Removal

1. Remove the Back cover (shown removed)

2. The support shields are sharp. Pull the right support shield (top) toward you to

remove. Set aside the support shield.

3. Remove 2 top screws, 2 bottom screws (401& 478).

4. Unplug 5 cables shown (CN4501, CN8201, CN3502, & CN6003).

5. Slide out the entire Chassis.

Chassis Installation

The chassis will NOT go all the way in (last ½”) if the chassis is not in the channels shown.

Slide # 6

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Model PT-xxLCX70

Access (groups A - D)

Boards are accessed in 3 groups shown below. Light Engine pull requires groups 2 & 3 to be removed first.

Light Engine Removal (group D):

1. Remove the Rear Board

2. Remove the PS & Tuner bds.

3. Slide the L Engine away from

the Lamp Block.

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Lamp Group A

• Lamp PS (top)

• Lamp Ass embly w

small rear fan

Rear Board group B

Power Supply / Tuner Bd group C

Model PT-xxLCX70

Lamp assembly part

Access – lamp group A

Lamp Group A removal overview:

1. Unplug 5 cables (not shown).

2. Remove the 8 screws that hold the fan

frame + top lamp power supply (shown in the next detail pages) & lift out.

3. Remove 6 bottom screws and lift the lamp

assembly out.

Lamp Group A

4. Remove the side & bottom shields from the

lamp. The lamp is the heat sink assembly.

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Right shield

Model PT-xxLCX70

Lamp Removal Details 1/3

1) Remove 8 screws.

2) Then, Remove the Fan Frame with the Fans and RF amp Power PCB together.

the Fan Frame

Slide # 9

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Model PT-xxLCX70

Lamp Removal Details 2/3

3) Remove 6 screws. Then, slide out the Lamp ass’y.

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Lamp ass’y

Model PT-xxLCX70

Lamp Removal Details 3/3

Lamp unit

4) Then, remove the 4 Plates from Lamp

Slide # 11

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ass’y.(11 screws)

Lamp Assembly

Lamp unit

Model PT-xxLCX70

Access (groups A - D)

Boards are accessed in 3 groups (A-C) shown below. Light Engine pull requires groups B & C to be removed first.

Light Engine Removal (group D):

1. Remove the Rear Board

2. Remove the PS & Tuner bds.

3. Slide the L Engine away from

the Lamp Block.

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Lamp Group A

• Lamp PS (top)

• Lamp Ass embly w

small rear fan

Rear Board group B

Power Supply / Tuner Bd group C

Model PT-xxLCX70

Access – Rear Board group B

Rear Board removal:

1. Lift off the black rear jack panel, after

removing the 6 screws (452 are machine & 402 are self tapping).

2. Remove 5 screws around the

perimeter of the rear board.

3. Remove 4 connectors shown below.

Rear Board

group B

4. Pull the board down to unplug (from

CN3501.

Slide # 13

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Model PT-xxLCX70

Access –Tuner & Power Bds. group C

Tuner & Power Bd. removal:

1. Remove 3 screws on the tuner bd & lift off.

2. Remove 4 screws from around the power

supply board. A right angle or stubby screwdriver will be handy.

Tuner Bd &

Power Supply

group C

PS Bd.

screw

3. The 5

power supply board screw can be accessed after you remove the rear jack board.

4. Alternate procedure – If you are unable to remove

the 5 screws because of the angle, slide out the entire PS assembly after removing a front and a top chassis screw, as shown below.

4. PS top ch screw

PS Bd

screw

4. PS front ch screw

Slide # 14

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Model PT-xxLCX70

Access – Main Bd. & Light Engine group D

The Main Bd & Light Eng are removed after removing the Rear board (group B) and the Tuner board (group C).

Main Bd. & Light Engine removal (overview):

Main Bd & L Eng

(group D)

Tuner Bd

(group C)

Rear

Board

(group B)

1. Remove 3 screws on the tuner bd & lift off.

2. Remove the rear jack board (11 screws).

3. At the top remove the main board (7 screws)

4. At the base, remove the screws that hold the

black optical unit. The Main board and Optical unit are replaced together (matched). If they are replaced separately WB, brightness, position data in the S/M must be adjusted.

Slide # 15

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5. Refer to the service manual for optics removal details. Model PT-xxLCX70

Panasonic PT-xxLCX70 LIFI series LCD PTV Repair

 New Lamp Technology 3  Flexible Repair Policy 4

 Access

• Chassis Removal 6

• Assemblies

• Lamp Assembly Removal

• Rear Board Removal

• Power Supply & Tuner Bds.

• Main Bd & Light Engine

 Layout of used & unused Connectors

• Rear View 17

• Top View 18

 No TV Start Up

• Normal Power On Sequence 20

• Dead Set 22

• Power LED blinks continuously 23

 TV Shuts Down

• Error Code Summary 25

• Orange 1X, 3X, 4X (voltage loss) 26

• Orange 2X

Slide # 16

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(groups A-D) 7

(group A) 8

(group B) 13

(D) 15

(DT+9V loss / therm fuse) 27

 TV Shuts Down (con’t)

• Orange 6X (Audio out) 28

• Orange 7X, 9X (Communications loss) 29

• Orange 10X (+17Vdc loss) 30

• Lamp Mis-Operation

(troubleshooting clues) 32

• Red 2X, 3X, or 13X ( no lamp) 33

• Quick Lamp Checks & return info 34

• Red 4X (high temp) 37

• Red 5X (no lamp communications) 39

• Red 8X, 9X, 10X, 11X (no fan) 40

• Red 12X (no rear board connection) 41

 Service Mode

• 3 S/M What can they do for me? 43

• Entry & Navigation - S/M 1

• Entry & Navigation - S/M 2

• Entry & Navigation - S/M 3

(TV Reset) 44 (pattern,code) 45 (D Chan SNR)47

 Adjustments after Light Engine Replacement

• Picture Straighten 49

• Mechanical Focus 51

 Video Process; Audio Process 53  Useful Part numbers 55

Model PT-xxLCX70

Layout – Rear View

Slide # 17

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Model PT-xxLCX70

+ 39 hidden pages