Panasonic TH-L22C5D Schematic

ORDER NO.PAVCI1206038CE

LCD TV

Model No. TH-L22C5D

TH-L32C5D

©Panasonic Corporation 2012. Unauthorized copying and distribution is a violation of law.

CONTENTS

1. Safety precautions .................................................................................................

2. Alignment instructions and method of software upgrading.....................................

3. Working principle analysis of the unit ...................................................................14

4. Specifications.......................................................................................................15

5. Block diagram ......................................................................................................16

6. Wiring diagram ...................................................................................................

7. Troubleshooting guide..........................................................................................24

8. Exploded View (22”, 32”) .....................................................................................28

9. Replacement Parts List (22”, 32”) ........................................................................32

10. Boards Layout....................................................................................................34

11. Disassembly and Assembly Instructions............................................................33

Attention:

please read the following points carefully.

Safety precautions

This service manual is only for service personnel to take reference with. Before

servicing

1. Instructions

Be sure to switch off inserting/plugging in connection wire Anti static measures to be taken (throughout the entire production process!):

a) Do not touch here and there by hand at will; b) Be sure to use anti static electric iron; c) It’s a must for the welder to wear anti static gloves. Please refer to the detailed list before replacing components that have special safety requirements. Do not change the specs and type at will.

the power supply before

replacing or welding any components or

2. Points for attention in servicing of LCD

2.1 Screens are different from one model to another and therefore not interchangeable. Be sure to

Use the screen of the original model for replacement.

2.2 The operation voltage of LCD screen is protecting yourself and the machine when testing the system in the course of normal operation or right after the power is switched off. Please do not touch the circuit or the metal part of the module

high voltage. Be

sure to take proper measures in

That is in operation mode. Relevant operation is possible only one minute after the power is switched off.

2.3 Do not use any adapter that is not identical with the TV set. Otherwise it will cause fire or damage to the set.

2.4 Never operate the set or do any installation work in bad environment such as wet bathroom,

laundry, kitchen, or nearby fire source, heating equipment and devices or exposure to sunlight etc. Otherwise bad effect will result.

2.5 If any foreign substance such as water, liquid, metal slices or other matters happens to fall into the

module, be sure to cut the power off immediately and do not move anything on the module lest it should cause fire or electric shock due to contact with the high voltage or short circuit.

2.6 Should there be smoke, abnormal smell or sound from the module, please shut the power off at

once. Likewise, if the screen is not working after the power is on or in the course of operation, the power must be cut off immediately and no more operation is allowed under the same condition.

2.7 Do not pull out or plug in the connection wire when the module is in operation or just after the

power is off because in this case relatively high voltage still remains in the capacitor of the driving circuit. Please wait at least one minute before the pulling out or plugging in the connection wire.

2.8 When operating or installing LCD please don’t subject the LCD components to bending, twisting or

extrusion, collision lest mishap should result.

2.9 As most of the circuitry in LCD TV set is composed of CMOS integrated circuits, it’s necessary to

pay attention to anti statics. Before servicing LCD TV make sure to take anti static measure and ensure full grounding for all the parts that have to be grounded.

2.10 There are lots of connection wires between parts behind the LCD screen. When servicing or

moving the set please take care not to touch or scratch them. Once they are damaged the screen would be unable to work and no way to get it repaired.

If the connection wires, connections or components fixed by the thermo tropic glue need to disengage when service, please soak the thermo tropic glue into the alcohol and then pull them out in case of damage.

2.11 Special care must be taken in transporting or handling it. Exquisite shock vibration may lead to

breakage of screen glass or damage to driving circuit. Therefore it must be packed in a strong case before the transportation or handling.

2.12 For the storage make sure to put it in a place where the environment can be controlled so as to

prevent the temperature and humidity from exceeding the limits as specified in the manual. For prolonged storage, it is necessary to house it in an anti-moisture bag and put them altogether in one place.

The ambient conditions are tabulated as follows:

Temperature

Scope for operation

~ + 35

Humidity

2.13

Display of a fixed picture for a long time may result in appearance of picture residue on the screen, as commonly called “ghost shadow”. The extent of the residual picture varies with the maker of LCD screen. This phenomenon doesn’t represent failure. This “ghost shadow” may remain in the picture for a period of time (several minutes). But when operating it please avoid displaying still picture in high brightness for a long time.

Scope for storage

Scope for operation

Scope for storage

0 ~

+ 60oC

20% ~

5% ~ 90%

3. Points for attention during installation

3.1 The front panel of LCD screen is of glass. When installing it please make sure to put it in place.

3.2 For service or installation it’s necessary to use specified screw lest it should damage the screen.

3.3 Be sure to take anti dust measures. Any foreign substance that happens to fall down between the screen and the glass will affect the receiving and viewing effect

3.4 When dismantling or mounting the protective partition plate that is used for anti vibration and insulation please take care to keep it in intactness so as to avoid hidden trouble.

3.5 Be sure to protect the cabinet from damage or scratch during service, dismantling or mounting.

2. Alignment instructions

(1) Test equipment

VG-859 (YPbPr, VGA, HDMI signal generator) FLUKE 54200(TV signal generator) CA210 (white balancer)

(2) Power test

Connect main board, power board and IR board according the wiring diagram, connect the power and press power key (Remote controller or Keypad) button to turn on the TV. a)Test the pin voltage of P802/power board , the data is shown in table1:

Table1 voltage data of P802

For 22”

P802 Pin1,2 Pin2 Pin3,4 Pin5 Pin6

Voltage 4.75V~5.25V 4.75V~5.25V GND

For 22”

Pin7 Pin8,9 Pin 10,11 Pin12 Pin13

Dute:20%~100% 11.4V~12.6V GND

Normal:0V~0.5V

Abnormal :Open drain

On:2.5V-5.25V

Off: 0-0.5V

On:2.5V-5.25V

Off: 0-0.5V

For 32”

P802 Pin1,2 Pin3,4 Pin5,6,7

Voltage GND 11.4V~12.6V GND 11.4V~12.6V 4.75V~5.25V

For 32”

Pin12 Pin13 Pin 14 Pin15 Pin16

On:2.5V-5.25V

Off: 0-0.5V

Normal:0V~0.5V

Abnormal :Open drain

On:2.5V-5.25V

Off: 0-0.5V

Pin8,9 Pin10,11

Duty 20%~100% NC

(3) Alignment flow-chart

The alignment flow-chart is shown as fig-1

Connect to the center signal source and check each Function of TV (station leaking, analog control, etc.)

Check the output of earphone and speaker.

Check if DDC, HDCP KEY, FLASH are written

Combined test for general assembly

White balance adjustment

Input HD signal and check the function of YPbPr

Input VGA signal and check if the display is normal,

Input AV signal and check the function

the function (analog control), horizontal/vertical center, etc.

check

Input USB signal and check if the display is normal, check

Input HDMI signal and check if the display is normal

, check

the function (analog control), horizontal/vertical center, etc.

Preset ex-factory

Check the accessories and packing

Fig-1 adjustment flow-chart

(4) Adjustment instruction

At any input source then press the “Mute” (Remote control) and External Manual key to enter factory mode During Factory menu, if “Mute” (Remote control) key is pushed, system will exit factory mode.

4-1. Source Calibration

4-1.1. Follow Compal provided auto adjustment tool or refer below process if no tool.

Set the generator to input the source Component on LCD-TV AV1. The Generator ASTRO-859 or equal equipment set on Timing 720p color bar of 100%. ASTRO setting: Timing: PG2 940 720p/60 or 50Hz, Pattern: PG2 924 NTSC Color bar 100% as below picture.

Color Bar 100/100-H

1 2 3 4 5

mV mV mV

700

16 to 235 235 16 to 240 128 16 to 240 128

6 7 8

147 47 0

-81 350 0

350 -34 0

62 31 16 102 240 128 240 117 128

4-1.2. Press the up or down key on remote controller to select the Auto Calibration icon with

press the key “>” on remote to perform the calibration.

The calibration performing is automatically, when show the OK means finish. Repeat 4-1.2 for VGA source calibration. Astro-859 or equal equipment is set on timing 1024x768 60Hz, Pattern color bar below ASTRO setting: Timing: PG2 963 1024*768/60Hz, Pattern: PG2 924 NTSC Color bar 100% as below picture.

1 8

mV mV mV

700 0 700 0 700 0

4-2. Color Temperature Adjustment & Check

4-2.1 Set the signal generator to HDMI 720p full white pattern, into LCD-TV HDMI IN.

ASTRO-859 or equal equipment, PG2 timing 857, pattern 956, The adjustments that G gain and G Offset is keep always 512 without change. Only adjust the R and B with gain and offset.

4-2.2 Press the up or down key on remote controller to select the Cool first.

Press “OK” key to enter adjusts items. Firstly adjusts the Offset on signal level 30IRE(77/255) with R Offset and B Offset for in spec as below table. Secondly, adjusts the Gain on signal 70IRE(179/255) with R Gain and B Gain for in spec as below table. Repeat to 30IRE and next 70IRE adjustments for meet 30/70 IRE spec as below table.

4-2.3. Select 「Warm」

Step 1.First Turning Gain parts of RGB.

(1) Warm spec.:

x= 0.318±0.005 y= 0.331±0.005

(2) If the x and y value are larger than specification,

Decrease R GAIN drive from default value. Increase B GAIN drive from default value

(3) If the x or y or both x and y value is/are smaller than specification.

Decrease B GAIN drive from default value

(4) According to a x and y value, please following adjustment of (4)-1 or (4)-2.

(4)-1 If x value is higher than spec

Decrease R GAIN drive from default value. Increase B GAIN drive from default value.

(4)-2 If y value is higher than spec,

Decrease B GAIN drive from default value

Step 2.When finish Gain parts, then turning OFFSET parts

Select 「N

(1) Medium spec.: (Same as the Gain session )

x= 0.289±0.005 y= 0.306±0.005

(2) If the x and y value are larger than specification,

Decrease R OFFSET drive from default value. Increase B OFFSET drive from default value.

(3) If the x or y or both x and y value is/are smaller than specification.

Decrease B OFFSET drive from default value

(4) According to a x and y value, please following adjustment of (4)-1 or (4)-2.

Step 3. Than select 「C

x= 0.273±0.005 y= 0.280±0.005

4-2.4. Exit Factory Mode: After finish adjusting color temperature press [MENU] to exit factory mode.

ormal」

(4)-1 If x value is higher than spec

Decrease R OFFSET drive from default value. Increase B OFFSET drive from default value.

(4)-2 If y value is higher than spec,

Decrease B OFFSET drive from default value Step 3.When finishing OFFSET parts, then recheck Gain parts .unitl Both of them meet the target specification.

ool」 using same way to adjust the setting.

(5) Items of Factory menu

When in PC/ Component/ Video (Composite)/ ANT inputs then press the [MUTE] key by remote control and press [MENU] key by side key over 2 sec to enter factory mode.

During Factory menu, if [EXIT] key is pushed, system will exit factory mode. Press up and down key can move high light item from Color Temperature -> Shipping -> NV Clear -> Full

Power -> Auto Calibration -> RF Burn In -> Reset -> USB Upgrade -> Write EDID -> Gamma.

Push [OK] or [ > ] key can select high light item function. (Press left and right can adjust value) Display model name, firmware version and released date on top.

Panel size : 22 / 32/ 42

F/W Version

1) Factory Color Temp data edit Press up or down key can select high light item function Press enter key to enter the item.

-Color temp default preset No (Warm, Medium, Cool).

-R, G, B data for each preset Press “Up” or “Down” key to select “R”, “G”, “B” item Press “Left” or “Right” key to set the “R”, “G”, “B” value Press “MENU” or “EXIT” item to exit to factory mode

2) Shipping mode

Select shipping country then “Reset” for into shipping mode.

Board Name (PCB Version)

PQ Version

AQ Version

Panel Name (Panel vendor)

3) NV CLEAR

Initialize program’s default values to NVRAM for following adjustment items accuracy.

In factory mode it is the first and important step to make sure all values are default value and correct

- Reset settings: Gamma table, Channel table (Favorite channel, Channel label etc.), Model table (H/V Position, Clock, Phase), Source dependent setting (Contrast, Brightness etc.), Common setting (Volume, Language etc.), Parental Control (Rating, Password etc), Closed Caption.

To avoid a mistake initial process after factory setting is done. This item will have a check dialog “yes or no” to do the initial or not.

4) Full power This is for power consumption testing. To measure the maximum power consumption of TV set, we adjust the value of following items to maximum.

- Video: Contrast maximum value, Brightness maximum value, Backlight maximum value.

- Audio: Volume maximum value, Bass default value, Treble default value. Press enter key to turn on Full Power and OSD stay display until press enter key to recover from Full Power.

5) Auto Calibration Source Calibration (gain/offset) must be adjusted color by firmware automatic adjustment in PC, Composite and Component input source. This item will have a result dialog “OK” or “NG”.

6) RF Burn In Use “snow” pattern for burn in. Selected items are “On” and “Off”. While turn on burn in mode, firmware will automatically turn off “Auto power off” function. If there is no power supply suddenly, firmware will re-enter burn in mode automatically when power supply is back Pressed the “Power” key, firmware will automatically turn off burn in mode. Burn in mode: Source is “ANT/Cable" and channel is NTSC channel 3.

7) Reset Reset all settings of OSD menu to default value.

- Reset settings: Channel table, Model table (H/V Position, Clock, Phase), Source dependent setting (Contrast, Brightness etc.), Common setting (Volume, Language etc.), Parental Control (Rating, Password etc), Closed Caption.

8) USB Upgrade

Upgrade firmware through USB.

9) Write EDID

Write EDID into VGA and HDMI EEPROM. This item will have a check dialog “yes or no” to do the initial or not.

10) Gamma For factory test value of gamma.

(

6) Performance check

6-1 TV function Connect RF to the center signal source, enter Channel menu → auto tuning, check if there are channels be skipped, check if the picture and speaker are normal.

6-2 AV terminals Input Video signal, check if the picture and sound are normal.

6-3 YPbPr terminal Input YUV signal (VG859 signal generator), separately input the YUV signals listed in table4 and check if the display and sound are normal at any situation (power on, channel switch and format convert, etc.)

LINE (pixel)

Table4 YUV signal format

FREQ PERIOD

SYNC

POLARITY

PIXEL

CLOCK

Display

SYNC

WIDTH

BACK

PORCH

MODE

LINE(kHz)

FRAME

(Hz)

LINE (pixel)

FIELD (lines)

LINE

FIELD

(MHz)

FRAME

(lines)

FRAME

(lines)

FRAME

(lines)

15.734 1716 Negitive 27 1440 124 114

59.94Hz 720x480i

59.94Hz 720x480P

60Hz 1280x720P

60Hz 1920X1080i

60Hz 1920X1080P

59.94 525 Negitive 480 3 15

31,469 858 Negitive 27 720 62 60

59.94 525 Negitive 480 6 30

45 1650 Positive 74.25 1280 40 220

60 750 Positive 720 5 20

33.75 2200 Positive 74.25 1920 44 148

60 1125 Positive 1080 5 15

67.5 2200 Positive 148.5 1920 44 148

60 1125 Positive 1080 5 36

6-4 VGA terminal

Input VGA signal (VG848 signal generator), separately input the signals listed in table5 and check the display and sound. If the image is deflection of the Horizontal and vertical, select Menu->Setup->Auto Adjust to perform autocorrect.

Table5 VGA signal format

FREQ PERIOD

SYNC

POLARITY

PIXEL

CLOCK

Display

SYNC

WIDTH

BACK

PORCH

Mode

VGA 60Hz

LINE(kHz)

FRAME(Hz)

LINE (pixel)

FIELD(lines)

LINE

FIELD

(MHz)

LINE (pixel)

FRAME(lines)

31.469 800 Negative 25.175 640 96 40

LINE (pixel)

FRAME

(lines)

LINE (pixel)

FRAME

640x480 59.941 525 Negative 480 2 25

SVGA 60Hz

37.879 1056 Positive 40 800 128 88

800x600 60.317 628 Positive 600 4 23

XGA 60Hz

1024x768

WXGA 60Hz

1280x768

WXGA 60Hz

1360x768

48.363 1344 Negative 65 1024 136 160

60.004 806 Negative 768 6 29

47.776 1664 Negative 79.5 1280 128 192

59.87 798 Positive 768 7 20

47.712 1792 Positive 85.5 1360 112 256

60.015 795 Positive 768 6 18

(lines)

6-5 HDMI terminal

LINE (pixel)

Input HDMI signal (VG859 signal generator), separately input the signals listed in table6 and check the display and sound (32 KHz, 44.1 KHz, 48 KHz) at any situation (power on, channel switch and format convert, etc.)

Table6 HDMI signal format

FREQ FREQ PERIOD

MODE

VGA 60Hz 31.469 800 Negitive 25.175 640 96 40

640x480 59.94 525 Negitive

SVGA 60Hz 37.879 1056 Positive

800x600 60.317 628 Positive

XGA 60Hz 48.363 1344 Negitive

1024x768 60.004 806 Negitive

WXGA 60Hz 47.776 1664 Negitive

1280x768 59.87 798 Positive

WXGA 60Hz 47.712 1792 Positive

1360x768 60.015 795 Positive

59.94Hz 720x480i

59.94 525 Negitive

59.94Hz 720x480P 31.469 858 Negitive

LINE(kHz)

FRAME(Hz)

15.734 1716 Negitive

LINE (pixel)

FIELD(lines)

SYNC

POLARITY

LINE

FIELD

PIXEL

CLOCK

(MHz)

480 2 25

40 800 128 88

600 4 23

65 1024 136 160

768 6 29

79.5 1280 128 192

768 7 20

85.5 1360 112 256

768 6 18

27 1440 124 114

480 3 15

27 720 62 60

Display

FRAME

(lines)

SYNC

WIDTH

LINE (pixel)

FRAME

(lines)

BACK

PORCH

LINE (pixel)

FRAME

(lines)

59.94 525 Negitive

60Hz 1280x720P

60 750 Positive

60Hz 1920X1080i

60 1125 Positive

60Hz 1920X1080P

60 1125 Positive

24Hz 1920x1080P

24 1125 Positive

6-6 other functions check a) Check the turn on/turn off timer, sleep timer, picture/sound mode, OSD, stereo and analog TV Teletext, etc.

45 1650 Positive 74.25 1280 40 220

33.75 2200 Positive 74.25 1920 44 148

67.5 2200 Positive

27 2750 Positive 74.25 1920 44 148

480 6 30

720 5 20

1080 5 15

148.5 1920 44 148

1080 5 36

(7) USB Software updated

(1) Plug the USB with the firmware file named . (

2) Into Factory mode & select USB upgrade , USB upgrade message would appear automatically. (3) Select Yes, and then start the upgrading. (4) Upgrading is starting, please wait for the progress finish. (5) When the progress completed, press Remote power on .

+ 28 hidden pages