Panasonic TH-L42U5D User manual

©Panasonic Corporation 2012.
Unauthorized copying and distribution is a
violation of law.
ORDER NO.PAVCI1206036CE
LCD TV
Model No. TH-L42U5D

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CONTENTS
1. Safety precautions .................................................................................................3
2. Alignment instructions and method of software upgrading.....................................5
3. Working principle analysis of the unit ...................................................................15
4. Specifications.......................................................................................................16
5. Block diagram ......................................................................................................17
6. Wiring diagram ...................................................................................................20
7. Troubleshooting guide..........................................................................................25
8. Exploded View .....................................................................................................29
9. Replacement Parts List........................................................................................31
10. Boards Layout....................................................................................................32
11. Disassembly and Assembly Instructions............................................................33

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Attention: This service manual is only for service personnel to take reference with. Before servicing
please read the following points carefully.
Safety precautions
1. Instructions
Be sure to switch off the power supply before replacing or welding any components or
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.
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 high voltage . Be sure to take proper measures in
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
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.

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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 0
~ + 35 o C
Scope for storage
0 ~ + 60o C
Humidity Scope for operation 20% ~ 80 %
Scope for storage 5% ~ 90%
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.
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.

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2. Alignment instructions
(1) Test equipment
VG-859 (YPbPr, VGA, HDMI 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 42”
P802 Pin1,2 Pin3,4 Pin5,6,7 Pin8,9 Pin10,11
Voltage GND 11.4V~12.6V GND 11.4V~12.6V 4.75V~5.25V
For 42”
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 Duty 20%~100% NC

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(3) Alignment flow-chart
The alignment flow-chart is shown as fig-1
Check if DDC, HDCP KEY, FLASH are written
Combined test for general assembly
White balance adjustment
Connect to the center signal source and check each
Function of TV (station leaking, analog control, etc.)
Check the output of earphone and speaker.
Input AV signal and check the function
Input HD signal and check the function of YPbPr
Input VGA signal and check if the display is normal, check
the function (analog control), horizontal/vertical center, etc.
Input USB signal and check if the display is normal, check
the function (analog control), horizontal/vertical center, etc.
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

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(4) Adjustment instruction
At any input source press the Mute(keep pressing) of Remote control and “Menu” (key pad) to enter factory mode .
During Factory menu, if “EXIT” key of Remote control is pushed, system will exit factory mode.
4-1. Source Calibration
4-1.1. Set the signal generator to input sources Component on LCD-TV;
Signal Format : 720P@60Hz Component 100%Color Bar
Instrument (Recommend) : Astro VG-859 / timing PG2 940
Signal analog level

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4-1.2. Entering factory Mode: Press up or down key of remote control to select “Auto Calibration”, Press 「OK」
key to enter the item.
-> Source calibration performed automatically, and “OK” info. will pop up after finished.
Repeat step 2 to do VGA input sources,
Signal Format : VGA 1024x768@60Hz
Instrument (Recommend) : Astro VG-859 / timing PG2 963

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4-2. Color Temperature Adjustment & Check
4-2.1. Set below items
4-2.3. Adjustment color temperature are min. / typ. / max.
1. Fixed the G Gain and G Offset, adjusts the R Gain, B Gain, R offset, B offset.
4-2.4. Exit Factory Mode:
After finish adjusting color temperature then press [MENU] or [RETURN] to back factory mode.
Press [EXIT] to exit factory mode.
4-2.2. Press up or down key of remote control to select “Cool”, Press 「ENTER」 key to enter the item.
RGAIN, GGAIN, BGAIN, ROFFSET, GOFFSET, BOFFSET, drive values are set for Warm, Normal,
and Cool independently.
2. If R Gain、B Gain and R offset、B offset value are larger the specification, duly change in G Gain or G
Offset at a time , after follow adjustment step 1.

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(5) Items of Factory menu
At any input source press the Mute(keep pressing) of Remote control and “Menu” (key pad) to enter factory mode .
During Factory menu, if “EXIT” key of Remote control is pushed, system will exit factory mode.
Press the up and down key to move high light item from Color Temperature -> Shipping -> NV Clear-> Full Power
-> Auto Calibration -> RF Burn In -> Debug ->Reset -> SoftWare Update(USB) ->Panel Gamma Control.
The NVRAM Clear and Reset to Default items will have a dialog “yes or no” to confirm the action.
Press “Enter” key to select high light item function. (Press left and right to adjust value)
1) Factory Color Temp data edit
Press up or down key to 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
Select the shipping area to “India” then do "Factory Reset "
After the actions are done, plug out the AC power.
3) NV CLEAR
Initializes TV setting to default values
- Reset settings: Gamma table, Channel table, Model table (H/V Position, Clock, Phase), Source
dependent setting (Contrast, Brightness etc.), Common setting (Volume, Language etc.), OSD
( Picture , Sound , Setup).
This item will have a dialog “yes or no” to confirm the action.
4) Full power
This is for power consumption test.
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.
Select on/off by left/right key and press Enter key to turn on/off the Full power function.
5) Auto Calibration
Source Calibration (gain/offset) must be adjusted by specific pattern, for VGA, Composite and
Component input source.
This item will have a result dialog “OK” or “NG”.

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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
supplied.
Pressed the “Power” key (key pad), firmware will automatically turn off burn in mode.
Burn in mode: Source is TV.
7) Debug
It is for service use only.
8) 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.).
9) Software update (USB)
Upgrade firmware through USB.
10) Panel Gamma Control
For factory test value of gamma.

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(6) Performance check
6-1 TV function
Connect RF signal, select “auto tuning” to search the channels and mark sure the picture and sound are normally
presented after finished.
6-2 AV terminals
Input Video signal, make sure the picture and sound are normally presented.
6-3 YPbPr terminal
Input YUV signal (VG859 signal generator), listed in table4 and make sure the picture and sound are normally
presented.
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)
LINE (pixel)
FRAME
(lines)
LINE (pixel)
FRAME
(lines)
LINE (pixel)
FRAME
(lines)
15.734 1716 Negative 27 1440 124 114
59.94Hz 720x480i 59.94 525 Negative 480 3 15
31,469 858 Negative 27 720 62 60
59.94Hz 720x480P 59.94 525 Negative 480 6 30
45 1650 Positive 74.25 1280 40 220
60Hz 1280x720P 60 750 Positive 720 5 20
50Hz 720x576i 15.734 1716 Negative 27 1440 124 114
59.94 525 Negative 480 3 15
50Hz 720x576P 31.5 858 Negative 27.03 720 62 60
50 525 Negative 480 6 30
50Hz 1920X1080i 33.75 2200 Positive 74.25 1920 44 148
50 1125 Positive 540 5 15
50Hz 1920X1080p 67.5 2640 Positive 148..5 1920 44 148
50 1125 Positive 1080 5 15
33.75 2200 Positive 74.25 1920 44 148
60Hz 1920X1080i 60 1125 Positive 1080 5 15
67.5 2200 Positive 148.5 1920 44 148
60Hz 1920X1080P 60 1125 Positive 1080 5 36

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6-4 VGA terminal
Input VGA signal (VG859 signal generator), listed in table5 and check the display and sound. You can select Menu
> Setup > PC setup > Auto Adjust to correct the picture deviation if needed.
Table5 VGA 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) LINE (pixel) FRAME(lines)
LINE (pixel)
FRAME
(lines)
LINE (pixel)
FRAME
(lines)
VGA 60Hz 31.469 800 Negative 25.175 640 96 40
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 48.363 1344 Negative 65 1024 136 160
1024x768 60.004 806 Negative 768 6 29
WXGA 60Hz 47.776 1664 Negative 79.5 1280 128 192
1280x768 59.87 798 Positive 768 7 20
WXGA 60Hz 47.712 1792 Positive 85.5 1360 112 256
1360x768 60.015 795 Positive 768 6 18
SXGA 60Hz 63.981 1688 Positive 108 1280 112 248
1280x1024 60.02 1066 Positive 1024 3 38
6-5 HDMI terminal
Input HDMI signal (VG859 signal generator), listed in table6 and make sure the picture and sound are normally
presented.
Table6 HDMI signal format
FREQ FREQ PERIOD SYNC
POLARITY
PIXEL
CLOCK Display SYNC WIDTH
BACK
PORCH
MODE LINE(kHz)
FRAME(Hz)
LINE (pixel)
FIELD(lines)
LINE
FIELD
(MHz)
LINE (pixel)
FRAME
(lines)
LINE (pixel)
FRAME
(lines)
LINE (pixel)
FRAME
(lines)
VGA 60Hz 31.469 800 Negative 25.175 640 96 40
640x480 59.94 525 Negative 480 2 25
SVGA 60Hz 37.879 1056 Positive 40 800 128 88
800x600 60.317 628 Positive 600 4 23
XGA 60Hz 48.363 1344 Negative 65 1024 136 160
1024x768 60.004 806 Negative 768 6 29
SXGA 60Hz 63.981 1688 Positive 108 1280 112 248
1280x1024 60.02 1066 Positive 1024 3 38
WXGA 60Hz 47.776 1664 Negative 79.5 1280 128 192
1280x768 59.87 798 Positive 768 7 20

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WXGA 60Hz 47.712 1792 Positive 85.5 1360 112 256
1360x768 60.015 795 Positive 768 6 18
59.94Hz 720x480i 15.734 1716 Negative 27 1440 124 114
59.94 525 Negative 480 3 15
59.94Hz 720x480P 31.469 858 Negative 27 720 62 60
59.94 525 Negative 480 6 30
50Hz 1440x576i 15.625 1716 Negative 27 1440 124 114
50 525 Negative 480 3 15
50Hz 1440x576P 31.25 858 Negative 27 720 62 60
50 525 Negative 576 6 30
60Hz 1280x720P 45 1650 Positive 74.25 1280 40 220
60 750 Positive 720 5 20
50Hz 1280x720P 37.5 1650 Positive 74.25 1280 40 220
50 750 Positive 720 5 20
50Hz 1920X1080i 28.13 2200 Positive 74.25 1920 44 148
50 1125 Positive 1080 5 15
50Hz 1920X1080P 56.25 2200 Positive 148.5 1920 44 148
50 1125 Positive 1080 5 36
60Hz 1920X1080i 33.75 2200 Positive 74.25 1920 44 148
60 1125 Positive 1080 5 15
60Hz 1920X1080P 67.5 2200 Positive 148.5 1920 44 148
60 1125 Positive 1080 5 36
24Hz 1920x1080P 27 2750 Positive 74.25 1920 44 148
24 1125 Positive 1080 5 36
30Hz 1920x1080P 33.75 2750 Positive 74.25 1920 44 148
30 1125 Positive 1080 5 36
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.
(7) USB Software updated
(1) Plug the USB with the firmware file named SPB42S.bin
(2) After system detected SPB42S.bin, USB upgrade message would appear automatically.
(3) Press Left key to select Yes, and then press OK key to start the upgrading.
(4) When the progress is completed, the TV set will restart automatically.
*USB FW update recovery
If firmware update fail, TV system cannot boot up normal, and you can use the following methods to
recover
(1)When AC power on, the LED will flash red light
(2)Put in firmware file("SPB42S.bin ") and plug USB device in the TV set.
(3)After burn in bin code, the LED will keep red light
(4)When the progress is complete, the TV set will restart automatically.

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Working principle analysis of the unit
1. Tuner signals flow:
Antenna signal will be send to tuner SUT-RE216TN, t h e n T u ne r w i ll p r o v id e t h e L o w I F
s ig n a l t o S c a le r a n d demodulated by it .
After processing the signals then output LVDS level drive for panel display and I2S signal to Class-D
audio Amplifier for speaker out
2. Composite/Component signal flow
Composite signal and Component signal will be fed to MST6100VS to perform video decode, de-
interlace and scaler, then output LVDS drive level for panel display.
Audio signal from Composite/Component terminal via matched resistance is fed to MST6100VS to bass
adjust and volume control, the sound signal be formed by I 2 S s i g n al and provide to Class-D audio
Amplifier for speaker out.
3. PC signal flow
PC signal via terminal socket sent to MST6100VS A/D, PC output R/G/B of 24 bit to back end
module to Video decode, de-interlace and image scale, then send to LVDS level drive for panel
display.
Sound signal of PC t e r m i n a l via matched resistance a n d sent to MST6100VS to bass adjust and
volume control, the sound signal be formed by I 2 S s ig n al and provide to Class-D audio Amplifier
for speaker out.
4. HDMI signal flow
Two HDMI video signals are directly fed to the master control IC MST6100VS to digital decode,
image scale, then output LVDS drive level for panel display. HDMI audio signal via decoder built-in
MST6100VS to bass adjust and volume control, the sound signal be formed by I 2 S s i g na l and
provide to Class-D audio Amplifier for speaker out.
5. USB signal flow
USB signal via USB connector sent to MST6100VS and its A/D conversion to YPbPr output for
MST6100 , then output R/G/B of 24 bit to back end module to Video decode, de-interlace and
image scale, then send to LVDS level drive for panel display.
Sound signal of USB signal v i a matched resistance a n d sent to MST6100VS to bass adjust and
volume control, the sound signal be formed by I 2 S s ig n al and provide to Class-D audio Amplifier
for speaker out.

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SPB42S 42” Block Diagram

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SPB42S Block Diagram
4-1 Power Block Diagram
SPB42S:
FSP power board:

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SPB42S 42-inch Wiring Diagram
I. BLOCK